Adding upstream version 115.7.0esr.upstream/115.7.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

18 files changed, 5736 insertions, 0 deletions

diff --git a/third_party/rlbox/README-mozilla b/third_party/rlbox/README-mozilla
new file mode 100644
index 0000000000..fe6192b655
--- /dev/null
+++ b/third_party/rlbox/README-mozilla
@@ -0,0 +1,10 @@
+This directory contains the rlbox source from the upstream repo:
+https://github.com/PLSysSec/rlbox_sandboxing_api/
+
+Current version: [commit 358fb5bb02a326c631efaebdfb59b0df2ab9c602]
+
+UPDATING:
+
+This in-tree copy can be updated by running
+  sh update.sh
+from within the third_party/rlbox directory.
diff --git a/third_party/rlbox/include/rlbox.hpp b/third_party/rlbox/include/rlbox.hpp
new file mode 100644
index 0000000000..96daaac233
--- /dev/null
+++ b/third_party/rlbox/include/rlbox.hpp
@@ -0,0 +1,1349 @@
+#pragma once
+
+#include <array>
+#include <cstring>
+#include <memory>
+#include <type_traits>
+#include <utility>
+
+#include "rlbox_app_pointer.hpp"
+#include "rlbox_conversion.hpp"
+#include "rlbox_helpers.hpp"
+#include "rlbox_policy_types.hpp"
+#include "rlbox_range.hpp"
+#include "rlbox_sandbox.hpp"
+#include "rlbox_stdlib.hpp"
+#include "rlbox_struct_support.hpp"
+#include "rlbox_type_traits.hpp"
+#include "rlbox_types.hpp"
+#include "rlbox_unwrap.hpp"
+#include "rlbox_wrapper_traits.hpp"
+
+namespace rlbox {
+
+template<template<typename, typename> typename T_Wrap,
+         typename T,
+         typename T_Sbx>
+class tainted_base_impl
+{
+  KEEP_CLASSES_FRIENDLY
+  KEEP_CAST_FRIENDLY
+
+public:
+  inline auto& impl() { return *static_cast<T_Wrap<T, T_Sbx>*>(this); }
+  inline auto& impl() const
+  {
+    return *static_cast<const T_Wrap<T, T_Sbx>*>(this);
+  }
+
+  /**
+   * @brief Unwrap a tainted value without verification. This is an unsafe
+   * operation and should be used with care.
+   */
+  inline auto UNSAFE_unverified() const { return impl().get_raw_value(); }
+  /**
+   * @brief Like UNSAFE_unverified, but get the underlying sandbox
+   * representation.
+   *
+   * @param sandbox Reference to sandbox.
+   *
+   * For the Wasm-based sandbox, this function additionally validates the
+   * unwrapped value against the machine model of the sandbox (LP32).
+   */
+  inline auto UNSAFE_sandboxed(rlbox_sandbox<T_Sbx>& sandbox) const
+  {
+    return impl().get_raw_sandbox_value(sandbox);
+  }
+
+  /**
+   * @brief Unwrap a tainted value without verification. This function should
+   * be used when unwrapping is safe.
+   *
+   * @param reason An explanation why the unverified unwrapping is safe.
+   */
+  template<size_t N>
+  inline auto unverified_safe_because(const char (&reason)[N]) const
+  {
+    RLBOX_UNUSED(reason);
+    static_assert(!std::is_pointer_v<T>,
+                  "unverified_safe_because does not support pointers. Use "
+                  "unverified_safe_pointer_because.");
+    return UNSAFE_unverified();
+  }
+
+  template<size_t N>
+  inline auto unverified_safe_pointer_because(size_t count,
+                                              const char (&reason)[N]) const
+  {
+    RLBOX_UNUSED(reason);
+
+    static_assert(std::is_pointer_v<T>, "Expected pointer type");
+    using T_Pointed = std::remove_pointer_t<T>;
+    if_constexpr_named(cond1, std::is_pointer_v<T_Pointed>)
+    {
+      rlbox_detail_static_fail_because(
+        cond1,
+        "There is no way to use unverified_safe_pointer_because for "
+        "'pointers to pointers' safely. Use copy_and_verify instead.");
+      return nullptr;
+    }
+
+    auto ret = UNSAFE_unverified();
+    if (ret != nullptr) {
+      size_t bytes = sizeof(T) * count;
+      detail::check_range_doesnt_cross_app_sbx_boundary<T_Sbx>(ret, bytes);
+    }
+    return ret;
+  }
+
+  inline auto INTERNAL_unverified_safe() const { return UNSAFE_unverified(); }
+
+#define BinaryOpValAndPtr(opSymbol)                                            \
+  template<typename T_Rhs>                                                     \
+  inline constexpr auto operator opSymbol(const T_Rhs& rhs)                    \
+    const->tainted<decltype(std::declval<T>() opSymbol std::declval<           \
+                            detail::rlbox_remove_wrapper_t<T_Rhs>>()),         \
+                   T_Sbx>                                                      \
+  {                                                                            \
+    static_assert(detail::is_basic_type_v<T>,                                  \
+                  "Operator " #opSymbol                                        \
+                  " only supported for primitive and pointer types");          \
+                                                                               \
+    auto raw_rhs = detail::unwrap_value(rhs);                                  \
+                                                                               \
+    if constexpr (std::is_pointer_v<T>) {                                      \
+      static_assert(std::is_integral_v<decltype(raw_rhs)>,                     \
+                    "Can only operate on numeric types");                      \
+      auto ptr = impl().get_raw_value();                                       \
+      detail::dynamic_check(ptr != nullptr,                                    \
+                            "Pointer arithmetic on a null pointer");           \
+      /* increment the target by size of the data structure */                 \
+      auto target =                                                            \
+        reinterpret_cast<uintptr_t>(ptr) opSymbol raw_rhs * sizeof(*impl());   \
+      auto no_overflow = rlbox_sandbox<T_Sbx>::is_in_same_sandbox(             \
+        reinterpret_cast<const void*>(ptr),                                    \
+        reinterpret_cast<const void*>(target));                                \
+      detail::dynamic_check(                                                   \
+        no_overflow,                                                           \
+        "Pointer arithmetic overflowed a pointer beyond sandbox memory");      \
+                                                                               \
+      return tainted<T, T_Sbx>::internal_factory(reinterpret_cast<T>(target)); \
+    } else {                                                                   \
+      auto raw = impl().get_raw_value();                                       \
+      auto ret = raw opSymbol raw_rhs;                                         \
+      using T_Ret = decltype(ret);                                             \
+      return tainted<T_Ret, T_Sbx>::internal_factory(ret);                     \
+    }                                                                          \
+  }                                                                            \
+  RLBOX_REQUIRE_SEMI_COLON
+
+  BinaryOpValAndPtr(+);
+  BinaryOpValAndPtr(-);
+
+#undef BinaryOpValAndPtr
+
+#define BinaryOp(opSymbol)                                                     \
+  template<typename T_Rhs>                                                     \
+  inline constexpr auto operator opSymbol(const T_Rhs& rhs)                    \
+    const->tainted<decltype(std::declval<T>() opSymbol std::declval<           \
+                            detail::rlbox_remove_wrapper_t<T_Rhs>>()),         \
+                   T_Sbx>                                                      \
+  {                                                                            \
+    static_assert(detail::is_fundamental_or_enum_v<T>,                         \
+                  "Operator " #opSymbol                                        \
+                  " only supported for primitive  types");                     \
+                                                                               \
+    auto raw = impl().get_raw_value();                                         \
+    auto raw_rhs = detail::unwrap_value(rhs);                                  \
+    static_assert(std::is_integral_v<decltype(raw_rhs)>                        \
+                  || std::is_floating_point_v<decltype(raw_rhs)>,              \
+                  "Can only operate on numeric types");                        \
+                                                                               \
+    auto ret = raw opSymbol raw_rhs;                                           \
+    using T_Ret = decltype(ret);                                               \
+    return tainted<T_Ret, T_Sbx>::internal_factory(ret);                       \
+  }                                                                            \
+  RLBOX_REQUIRE_SEMI_COLON
+
+  BinaryOp(*);
+  BinaryOp(/);
+  BinaryOp(%);
+  BinaryOp(^);
+  BinaryOp(&);
+  BinaryOp(|);
+  BinaryOp(<<);
+  BinaryOp(>>);
+
+#undef BinaryOp
+
+#define CompoundAssignmentOp(opSymbol)                                         \
+  template<typename T_Rhs>                                                     \
+  inline constexpr T_Wrap<T, T_Sbx>& operator opSymbol##=(const T_Rhs& rhs)    \
+  {                                                                            \
+    auto& this_ref = impl();                                                   \
+    this_ref = this_ref opSymbol rhs;                                          \
+    return this_ref;                                                           \
+  }                                                                            \
+  RLBOX_REQUIRE_SEMI_COLON
+
+  CompoundAssignmentOp(+);
+  CompoundAssignmentOp(-);
+  CompoundAssignmentOp(*);
+  CompoundAssignmentOp(/);
+  CompoundAssignmentOp(%);
+  CompoundAssignmentOp(^);
+  CompoundAssignmentOp(&);
+  CompoundAssignmentOp(|);
+  CompoundAssignmentOp(<<);
+  CompoundAssignmentOp(>>);
+
+#undef CompoundAssignmentOp
+
+#define PreIncDecOps(opSymbol)                                                 \
+  inline constexpr T_Wrap<T, T_Sbx>& operator opSymbol##opSymbol()             \
+  {                                                                            \
+    auto& this_ref = impl();                                                   \
+    this_ref = this_ref opSymbol 1;                                            \
+    return this_ref;                                                           \
+  }                                                                            \
+  RLBOX_REQUIRE_SEMI_COLON
+
+  PreIncDecOps(+);
+  PreIncDecOps(-);
+
+#undef PreIncDecOps
+
+#define PostIncDecOps(opSymbol)                                                \
+  inline constexpr T_Wrap<T, T_Sbx> operator opSymbol##opSymbol(int)           \
+  {                                                                            \
+    tainted<T, T_Sbx> ret = impl();                                            \
+    operator++();                                                              \
+    return ret;                                                                \
+  }                                                                            \
+  RLBOX_REQUIRE_SEMI_COLON
+
+  PostIncDecOps(+);
+  PostIncDecOps(-);
+
+#undef PostIncDecOps
+
+#define BooleanBinaryOp(opSymbol)                                              \
+  template<typename T_Rhs>                                                     \
+  inline constexpr auto operator opSymbol(const T_Rhs& rhs)                    \
+    const->tainted<decltype(std::declval<T>() opSymbol std::declval<           \
+                            detail::rlbox_remove_wrapper_t<T_Rhs>>()),         \
+                   T_Sbx>                                                      \
+  {                                                                            \
+    static_assert(detail::is_fundamental_or_enum_v<T>,                         \
+                  "Operator " #opSymbol                                        \
+                  " only supported for primitive  types");                     \
+                                                                               \
+    auto raw = impl().get_raw_value();                                         \
+    auto raw_rhs = detail::unwrap_value(rhs);                                  \
+    static_assert(std::is_integral_v<decltype(raw_rhs)>,                       \
+                  "Can only operate on numeric types");                        \
+                                                                               \
+    auto ret = raw opSymbol raw_rhs;                                           \
+    using T_Ret = decltype(ret);                                               \
+    return tainted<T_Ret, T_Sbx>::internal_factory(ret);                       \
+  }                                                                            \
+                                                                               \
+  template<typename T_Rhs>                                                     \
+  inline constexpr auto operator opSymbol(const T_Rhs&&)                       \
+    const->tainted<decltype(std::declval<T>() opSymbol std::declval<           \
+                            detail::rlbox_remove_wrapper_t<T_Rhs>>()),         \
+                   T_Sbx>                                                      \
+  {                                                                            \
+    rlbox_detail_static_fail_because(                                          \
+      detail::true_v<T_Rhs>,                                                   \
+      "C++ does not permit safe overloading of && and || operations as this "  \
+      "affects the short circuiting behaviour of these operations. RLBox "     \
+      "does let you use && and || with tainted in limited situations - when "  \
+      "all arguments starting from the second are local variables. It does "   \
+      "not allow it if arguments starting from the second  are expressions.\n" \
+      "For example the following is not allowed\n"                             \
+      "\n"                                                                     \
+      "tainted<bool, T_Sbx> a = true;\n"                                       \
+      "auto r = a && true && sandbox.invoke_sandbox_function(getBool);\n"      \
+      "\n"                                                                     \
+      "However the following would be allowed\n"                               \
+      "tainted<bool, T_Sbx> a = true;\n"                                       \
+      "auto b = true\n"                                                        \
+      "auto c = sandbox.invoke_sandbox_function(getBool);\n"                   \
+      "auto r = a && b && c;\n"                                                \
+      "\n"                                                                     \
+      "Note that these 2 programs are not identical. The first program may "   \
+      "or may not call getBool, while second program always calls getBool");   \
+    return tainted<bool, T_Sbx>(false);                                        \
+  }                                                                            \
+  RLBOX_REQUIRE_SEMI_COLON
+
+  BooleanBinaryOp(&&);
+  BooleanBinaryOp(||);
+
+#undef BooleanBinaryOp
+
+#define UnaryOp(opSymbol)                                                      \
+  inline auto operator opSymbol()                                              \
+  {                                                                            \
+    static_assert(detail::is_fundamental_or_enum_v<T>,                         \
+                  "Operator " #opSymbol " only supported for primitive");      \
+                                                                               \
+    auto raw = impl().get_raw_value();                                         \
+    auto ret = opSymbol raw;                                                   \
+    using T_Ret = decltype(ret);                                               \
+    return tainted<T_Ret, T_Sbx>::internal_factory(ret);                       \
+  }                                                                            \
+  RLBOX_REQUIRE_SEMI_COLON
+
+  UnaryOp(-);
+  UnaryOp(~);
+
+#undef UnaryOp
+
+/**
+ * @brief Comparison operators. Comparisons to values in sandbox memory can
+ * only return a "tainted_boolean_hint" as the values in memory can be
+ * incorrect or malicously change in the future.
+ *
+ * @tparam T_Rhs
+ * @param rhs
+ * @return One of either a bool, tainted<bool>, or a tainted_boolean_hint
+ * depending on the arguments to the binary expression.
+ */
+#define CompareOp(opSymbol, permit_pointers)                                   \
+  template<typename T_Rhs>                                                     \
+  inline constexpr auto operator opSymbol(const T_Rhs& rhs) const              \
+  {                                                                            \
+    using T_RhsNoQ = detail::remove_cv_ref_t<T_Rhs>;                           \
+    constexpr bool check_rhs_hint =                                            \
+      detail::rlbox_is_tainted_volatile_v<T_RhsNoQ> ||                         \
+      detail::rlbox_is_tainted_boolean_hint_v<T_RhsNoQ>;                       \
+    constexpr bool check_lhs_hint =                                            \
+      detail::rlbox_is_tainted_volatile_v<T_Wrap<T, T_Sbx>>;                   \
+    constexpr bool is_hint = check_lhs_hint || check_rhs_hint;                 \
+                                                                               \
+    constexpr bool is_unwrapped =                                              \
+      detail::rlbox_is_tainted_v<T_Wrap<T, T_Sbx>> &&                          \
+      std::is_null_pointer_v<T_RhsNoQ>;                                        \
+                                                                               \
+    /* Sanity check - can't be a hint and unwrapped */                         \
+    static_assert(is_hint ? !is_unwrapped : true,                              \
+                  "Internal error: Could not deduce type for comparison. "     \
+                  "Please file a bug.");                                       \
+                                                                               \
+    if constexpr (!permit_pointers && std::is_pointer_v<T>) {                  \
+      rlbox_detail_static_fail_because(                                        \
+        std::is_pointer_v<T>,                                                  \
+        "Only == and != comparisons are allowed for pointers");                \
+    }                                                                          \
+                                                                               \
+    bool ret = (impl().get_raw_value() opSymbol detail::unwrap_value(rhs));    \
+                                                                               \
+    if constexpr (is_hint) {                                                   \
+      return tainted_boolean_hint(ret);                                        \
+    } else if constexpr (is_unwrapped) {                                       \
+      return ret;                                                              \
+    } else {                                                                   \
+      return tainted<bool, T_Sbx>(ret);                                        \
+    }                                                                          \
+  }                                                                            \
+  RLBOX_REQUIRE_SEMI_COLON
+
+  CompareOp(==, true /* permit_pointers */);
+  CompareOp(!=, true /* permit_pointers */);
+  CompareOp(<, false /* permit_pointers */);
+  CompareOp(<=, false /* permit_pointers */);
+  CompareOp(>, false /* permit_pointers */);
+  CompareOp(>=, false /* permit_pointers */);
+
+#undef CompareOp
+
+private:
+  using T_OpSubscriptArrRet = std::conditional_t<
+    std::is_pointer_v<T>,
+    tainted_volatile<detail::dereference_result_t<T>, T_Sbx>, // is_pointer
+    T_Wrap<detail::dereference_result_t<T>, T_Sbx>            // is_array
+    >;
+
+public:
+  template<typename T_Rhs>
+  inline const T_OpSubscriptArrRet& operator[](T_Rhs&& rhs) const
+  {
+    static_assert(std::is_pointer_v<T> || detail::is_c_or_std_array_v<T>,
+                  "Operator [] supports pointers and arrays only");
+
+    auto raw_rhs = detail::unwrap_value(rhs);
+    static_assert(std::is_integral_v<decltype(raw_rhs)>,
+                  "Can only index with numeric types");
+
+    if constexpr (std::is_pointer_v<T>) {
+      auto ptr = this->impl().get_raw_value();
+
+      // increment the target by size of the data structure
+      auto target =
+        reinterpret_cast<uintptr_t>(ptr) + raw_rhs * sizeof(*this->impl());
+      auto no_overflow = rlbox_sandbox<T_Sbx>::is_in_same_sandbox(
+        ptr, reinterpret_cast<const void*>(target));
+      detail::dynamic_check(
+        no_overflow,
+        "Pointer arithmetic overflowed a pointer beyond sandbox memory");
+
+      auto target_wrap = tainted<const T, T_Sbx>::internal_factory(
+        reinterpret_cast<const T>(target));
+      return *target_wrap;
+    } else {
+      using T_Rhs_Unsigned = std::make_unsigned_t<decltype(raw_rhs)>;
+      detail::dynamic_check(
+        raw_rhs >= 0 && static_cast<T_Rhs_Unsigned>(raw_rhs) <
+                          std::extent_v<detail::std_array_to_c_arr_t<T>, 0>,
+        "Static array indexing overflow");
+
+      const void* target_ptr;
+      if constexpr (detail::rlbox_is_tainted_v<T_Wrap<T, T_Sbx>>) {
+        auto& data_ref = impl().get_raw_value_ref();
+        target_ptr = &(data_ref[raw_rhs]);
+      } else {
+        auto& data_ref = impl().get_sandbox_value_ref();
+        auto target_ptr_vol = &(data_ref[raw_rhs]);
+        // target_ptr is a volatile... remove this.
+        // Safe as we will return a tainted_volatile if this is the case
+        target_ptr = detail::remove_volatile_from_ptr_cast(target_ptr_vol);
+      }
+
+      using T_Target = const T_Wrap<detail::dereference_result_t<T>, T_Sbx>;
+      auto wrapped_target_ptr = reinterpret_cast<T_Target*>(target_ptr);
+      return *wrapped_target_ptr;
+    }
+  }
+
+  template<typename T_Rhs>
+  inline T_OpSubscriptArrRet& operator[](T_Rhs&& rhs)
+  {
+    return const_cast<T_OpSubscriptArrRet&>(std::as_const(*this)[rhs]);
+  }
+
+private:
+  using T_OpDerefRet = tainted_volatile<std::remove_pointer_t<T>, T_Sbx>;
+
+public:
+  inline T_OpDerefRet& operator*() const
+  {
+    static_assert(std::is_pointer_v<T>, "Operator * only allowed on pointers");
+    auto ret_ptr_const =
+      reinterpret_cast<const T_OpDerefRet*>(impl().get_raw_value());
+    // Safe - If T_OpDerefRet is not a const ptr, this is trivially safe
+    //        If T_OpDerefRet is a const ptr, then the const is captured
+    //        inside the wrapper
+    auto ret_ptr = const_cast<T_OpDerefRet*>(ret_ptr_const);
+    return *ret_ptr;
+  }
+
+  // We need to implement the -> operator even if T is not a struct
+  // So that we can support code patterns such as the below
+  // tainted<T*> a;
+  // a->UNSAFE_unverified();
+  inline const T_OpDerefRet* operator->() const
+  {
+    static_assert(std::is_pointer_v<T>,
+                  "Operator -> only supported for pointer types");
+    return reinterpret_cast<const T_OpDerefRet*>(impl().get_raw_value());
+  }
+
+  inline T_OpDerefRet* operator->()
+  {
+    return const_cast<T_OpDerefRet*>(std::as_const(*this).operator->());
+  }
+
+  inline auto operator!()
+  {
+    if_constexpr_named(cond1, std::is_pointer_v<T>)
+    {
+      return impl() == nullptr;
+    }
+    else if_constexpr_named(cond2, std::is_same_v<std::remove_cv_t<T>, bool>)
+    {
+      return impl() == false;
+    }
+    else
+    {
+      auto unknownCase = !(cond1 || cond2);
+      rlbox_detail_static_fail_because(
+        unknownCase,
+        "Operator ! only permitted for pointer or boolean types. For other"
+        "types, unwrap the tainted value with the copy_and_verify API and then"
+        "use operator !");
+    }
+  }
+
+  /**
+   * @brief Copy tainted value from sandbox and verify it.
+   *
+   * @param verifier Function used to verify the copied value.
+   * @tparam T_Func the type of the verifier.
+   * @return Whatever the verifier function returns.
+   */
+  template<typename T_Func>
+  inline auto copy_and_verify(T_Func verifier) const
+  {
+    using T_Deref = std::remove_cv_t<std::remove_pointer_t<T>>;
+
+    if_constexpr_named(cond1, detail::is_fundamental_or_enum_v<T>)
+    {
+      auto val = impl().get_raw_value();
+      return verifier(val);
+    }
+    else if_constexpr_named(
+      cond2, detail::is_one_level_ptr_v<T> && !std::is_class_v<T_Deref>)
+    {
+      // Some paths don't use the verifier
+      RLBOX_UNUSED(verifier);
+
+      if_constexpr_named(subcond1, std::is_void_v<T_Deref>)
+      {
+        rlbox_detail_static_fail_because(
+          subcond1,
+          "copy_and_verify not recommended for void* as it could lead to some "
+          "anti-patterns in verifiers. Cast it to a different tainted pointer "
+          "with sandbox_reinterpret_cast and then call copy_and_verify. "
+          "Alternately, you can use the UNSAFE_unverified API to do this "
+          "without casting.");
+        return nullptr;
+      }
+      // Test with detail::is_func_ptr_v to check for member funcs also
+      else if_constexpr_named(subcond2, detail::is_func_ptr_v<T>)
+      {
+        rlbox_detail_static_fail_because(
+          subcond2,
+          "copy_and_verify cannot be applied to function pointers as this "
+          "makes a deep copy. This is not possible for function pointers. "
+          "Consider copy_and_verify_address instead.");
+        return nullptr;
+      }
+      else
+      {
+        auto val = impl().get_raw_value();
+        if (val == nullptr) {
+          return verifier(nullptr);
+        } else {
+          // Important to assign to a local variable (i.e. make a copy)
+          // Else, for tainted_volatile, this will allow a
+          // time-of-check-time-of-use attack
+          auto val_copy = std::make_unique<T_Deref>();
+          *val_copy = *val;
+          return verifier(std::move(val_copy));
+        }
+      }
+    }
+    else if_constexpr_named(
+      cond3, detail::is_one_level_ptr_v<T> && std::is_class_v<T_Deref>)
+    {
+      auto val_copy = std::make_unique<tainted<T_Deref, T_Sbx>>(*impl());
+      return verifier(std::move(val_copy));
+    }
+    else if_constexpr_named(cond4, std::is_array_v<T>)
+    {
+      static_assert(
+        detail::is_fundamental_or_enum_v<std::remove_all_extents_t<T>>,
+        "copy_and_verify on arrays is only safe for fundamental or enum types. "
+        "For arrays of other types, apply copy_and_verify on each element "
+        "individually --- a[i].copy_and_verify(...)");
+
+      auto copy = impl().get_raw_value();
+      return verifier(copy);
+    }
+    else
+    {
+      auto unknownCase = !(cond1 || cond2 || cond3 || cond4);
+      rlbox_detail_static_fail_because(
+        unknownCase,
+        "copy_and_verify not supported for this type as it may be unsafe");
+    }
+  }
+
+private:
+  using T_CopyAndVerifyRangeEl =
+    detail::valid_array_el_t<std::remove_cv_t<std::remove_pointer_t<T>>>;
+
+  // Template needed to ensure that function isn't instantiated for unsupported
+  // types like function pointers which causes compile errors...
+  template<typename T2 = T>
+  inline const void* verify_range_helper(std::size_t count) const
+  {
+    static_assert(std::is_pointer_v<T>);
+    static_assert(detail::is_fundamental_or_enum_v<T_CopyAndVerifyRangeEl>);
+
+    detail::dynamic_check(
+      count != 0,
+      "Called copy_and_verify_range/copy_and_verify_string with count 0");
+
+    auto start = reinterpret_cast<const void*>(impl().get_raw_value());
+    if (start == nullptr) {
+      return nullptr;
+    }
+
+    detail::check_range_doesnt_cross_app_sbx_boundary<T_Sbx>(
+      start, count * sizeof(T_CopyAndVerifyRangeEl));
+
+    return start;
+  }
+
+  template<typename T2 = T>
+  inline std::unique_ptr<T_CopyAndVerifyRangeEl[]> copy_and_verify_range_helper(
+    std::size_t count) const
+  {
+    const void* start = verify_range_helper(count);
+    if (start == nullptr) {
+      return nullptr;
+    }
+
+    auto target = std::make_unique<T_CopyAndVerifyRangeEl[]>(count);
+
+    for (size_t i = 0; i < count; i++) {
+      auto p_src_i_tainted = &(impl()[i]);
+      auto p_src_i = p_src_i_tainted.get_raw_value();
+      detail::convert_type_fundamental_or_array(target[i], *p_src_i);
+    }
+
+    return target;
+  }
+
+public:
+  /**
+   * @brief Copy a range of tainted values from sandbox and verify them.
+   *
+   * @param verifier Function used to verify the copied value.
+   * @param count Number of elements to copy.
+   * @tparam T_Func the type of the verifier. If the tainted type is ``int*``
+   * then ``T_Func = T_Ret(*)(unique_ptr<int[]>)``.
+   * @return Whatever the verifier function returns.
+   */
+  template<typename T_Func>
+  inline auto copy_and_verify_range(T_Func verifier, std::size_t count) const
+  {
+    static_assert(std::is_pointer_v<T>,
+                  "Can only call copy_and_verify_range on pointers");
+
+    static_assert(
+      detail::is_fundamental_or_enum_v<T_CopyAndVerifyRangeEl>,
+      "copy_and_verify_range is only safe for ranges of "
+      "fundamental or enum types. For other types, call "
+      "copy_and_verify on each element --- a[i].copy_and_verify(...)");
+
+    std::unique_ptr<T_CopyAndVerifyRangeEl[]> target =
+      copy_and_verify_range_helper(count);
+    return verifier(std::move(target));
+  }
+
+  /**
+   * @brief Copy a tainted string from sandbox and verify it.
+   *
+   * @param verifier Function used to verify the copied value.
+   * @tparam T_Func the type of the verifier either
+   * ``T_Ret(*)(unique_ptr<char[]>)`` or ``T_Ret(*)(std::string)``
+   * @return Whatever the verifier function returns.
+   */
+  template<typename T_Func>
+  inline auto copy_and_verify_string(T_Func verifier) const
+  {
+    static_assert(std::is_pointer_v<T>,
+                  "Can only call copy_and_verify_string on pointers");
+
+    static_assert(std::is_same_v<char, T_CopyAndVerifyRangeEl>,
+                  "copy_and_verify_string only allows char*");
+
+    using T_VerifParam = detail::func_first_arg_t<T_Func>;
+
+    auto start = impl().get_raw_value();
+    if_constexpr_named(
+      cond1,
+      std::is_same_v<T_VerifParam, std::unique_ptr<char[]>> ||
+        std::is_same_v<T_VerifParam, std::unique_ptr<const char[]>>)
+    {
+      if (start == nullptr) {
+        return verifier(nullptr);
+      }
+
+      // it is safe to run strlen on a tainted<string> as worst case, the string
+      // does not have a null and we try to copy all the memory out of the
+      // sandbox however, copy_and_verify_range ensures that we never copy
+      // memory outsider the range
+      auto str_len = std::strlen(start) + 1;
+      std::unique_ptr<T_CopyAndVerifyRangeEl[]> target =
+        copy_and_verify_range_helper(str_len);
+
+      // ensure the string has a trailing null
+      target[str_len - 1] = '\0';
+
+      return verifier(std::move(target));
+    }
+    else if_constexpr_named(cond2, std::is_same_v<T_VerifParam, std::string>)
+    {
+      if (start == nullptr) {
+        std::string param = "";
+        return verifier(param);
+      }
+
+      // it is safe to run strlen on a tainted<string> as worst case, the string
+      // does not have a null and we try to copy all the memory out of the
+      // sandbox however, copy_and_verify_range ensures that we never copy
+      // memory outsider the range
+      auto str_len = std::strlen(start) + 1;
+
+      const char* checked_start = (const char*)verify_range_helper(str_len);
+      if (checked_start == nullptr) {
+        std::string param = "";
+        return verifier(param);
+      }
+
+      std::string copy(checked_start, str_len - 1);
+      return verifier(std::move(copy));
+    }
+    else
+    {
+      constexpr bool unknownCase = !(cond1 || cond2);
+      rlbox_detail_static_fail_because(
+        unknownCase,
+        "copy_and_verify_string verifier parameter should either be "
+        "unique_ptr<char[]>, unique_ptr<const char[]> or std::string");
+    }
+  }
+
+  /**
+   * @brief Copy a tainted pointer from sandbox and verify the address.
+   *
+   * This function is useful if you need to verify physical bits representing
+   * the address of a pointer. Other APIs such as copy_and_verify performs a
+   * deep copy and changes the address bits.
+   *
+   * @param verifier Function used to verify the copied value.
+   * @tparam T_Func the type of the verifier ``T_Ret(*)(uintptr_t)``
+   * @return Whatever the verifier function returns.
+   */
+  template<typename T_Func>
+  inline auto copy_and_verify_address(T_Func verifier) const
+  {
+    static_assert(std::is_pointer_v<T>,
+                  "copy_and_verify_address must be used on pointers");
+    auto val = reinterpret_cast<uintptr_t>(impl().get_raw_value());
+    return verifier(val);
+  }
+
+  /**
+   * @brief Copy a tainted pointer to a buffer from sandbox and verify the
+   * address.
+   *
+   * This function is useful if you need to verify physical bits representing
+   * the address of a buffer. Other APIs such as copy_and_verify performs a
+   * deep copy and changes the address bits.
+   *
+   * @param verifier Function used to verify the copied value.
+   * @param size Size of the buffer. Buffer with length size is expected to fit
+   * inside sandbox memory.
+   * @tparam T_Func the type of the verifier ``T_Ret(*)(uintptr_t)``
+   * @return Whatever the verifier function returns.
+   */
+  template<typename T_Func>
+  inline auto copy_and_verify_buffer_address(T_Func verifier,
+                                             std::size_t size) const
+  {
+    static_assert(std::is_pointer_v<T>,
+                  "copy_and_verify_address must be used on pointers");
+    auto val = reinterpret_cast<uintptr_t>(verify_range_helper(size));
+    return verifier(val);
+  }
+};
+
+#define BinaryOpWrappedRhs(opSymbol)                                           \
+  template<template<typename, typename> typename T_Wrap,                       \
+           typename T,                                                         \
+           typename T_Sbx,                                                     \
+           typename T_Lhs,                                                     \
+           RLBOX_ENABLE_IF(!detail::rlbox_is_wrapper_v<T_Lhs> &&               \
+                           !detail::rlbox_is_tainted_boolean_hint_v<T_Lhs>)>   \
+  inline constexpr auto operator opSymbol(                                     \
+    const T_Lhs& lhs, const tainted_base_impl<T_Wrap, T, T_Sbx>& rhs)          \
+  {                                                                            \
+    /* Handles the case for "3 + tainted", where + is a binary op */           \
+    /* Technically pointer arithmetic can be performed as 3 + tainted_ptr */   \
+    /* as well. However, this is unusual and to keep the code simple we do */  \
+    /* not support this. */                                                    \
+    static_assert(                                                             \
+      std::is_arithmetic_v<T_Lhs>,                                             \
+      "Binary expressions between an non tainted type and tainted"             \
+      "type is only permitted if the first value is the tainted type. Try "    \
+      "changing the order of the binary expression accordingly");              \
+    auto ret = tainted<T_Lhs, T_Sbx>(lhs) opSymbol rhs.impl();                 \
+    return ret;                                                                \
+  }                                                                            \
+  RLBOX_REQUIRE_SEMI_COLON
+
+BinaryOpWrappedRhs(+);
+BinaryOpWrappedRhs(-);
+BinaryOpWrappedRhs(*);
+BinaryOpWrappedRhs(/);
+BinaryOpWrappedRhs(%);
+BinaryOpWrappedRhs(^);
+BinaryOpWrappedRhs(&);
+BinaryOpWrappedRhs(|);
+BinaryOpWrappedRhs(<<);
+BinaryOpWrappedRhs(>>);
+BinaryOpWrappedRhs(==);
+BinaryOpWrappedRhs(!=);
+BinaryOpWrappedRhs(<);
+BinaryOpWrappedRhs(<=);
+BinaryOpWrappedRhs(>);
+BinaryOpWrappedRhs(>=);
+#undef BinaryOpWrappedRhs
+
+#define BooleanBinaryOpWrappedRhs(opSymbol)                                    \
+  template<template<typename, typename> typename T_Wrap,                       \
+           typename T,                                                         \
+           typename T_Sbx,                                                     \
+           typename T_Lhs,                                                     \
+           RLBOX_ENABLE_IF(!detail::rlbox_is_wrapper_v<T_Lhs> &&               \
+                           !detail::rlbox_is_tainted_boolean_hint_v<T_Lhs>)>   \
+  inline constexpr auto operator opSymbol(                                     \
+    const T_Lhs& lhs, const tainted_base_impl<T_Wrap, T, T_Sbx>& rhs)          \
+  {                                                                            \
+    static_assert(                                                             \
+      std::is_arithmetic_v<T_Lhs>,                                             \
+      "Binary expressions between an non tainted type and tainted"             \
+      "type is only permitted if the first value is the tainted type. Try "    \
+      "changing the order of the binary expression accordingly");              \
+    auto ret = tainted<T_Lhs, T_Sbx>(lhs) opSymbol rhs.impl();                 \
+    return ret;                                                                \
+  }                                                                            \
+                                                                               \
+  template<template<typename, typename> typename T_Wrap,                       \
+           typename T,                                                         \
+           typename T_Sbx,                                                     \
+           typename T_Lhs,                                                     \
+           RLBOX_ENABLE_IF(!detail::rlbox_is_wrapper_v<T_Lhs> &&               \
+                           !detail::rlbox_is_tainted_boolean_hint_v<T_Lhs>)>   \
+  inline constexpr auto operator opSymbol(                                     \
+    const T_Lhs&, const tainted_base_impl<T_Wrap, T, T_Sbx>&&)                 \
+  {                                                                            \
+    rlbox_detail_static_fail_because(                                          \
+      detail::true_v<T_Lhs>,                                                   \
+      "C++ does not permit safe overloading of && and || operations as this "  \
+      "affects the short circuiting behaviour of these operations. RLBox "     \
+      "does let you use && and || with tainted in limited situations - when "  \
+      "all arguments starting from the second are local variables. It does "   \
+      "not allow it if arguments starting from the second  are expressions.\n" \
+      "For example the following is not allowed\n"                             \
+      "\n"                                                                     \
+      "tainted<bool, T_Sbx> a = true;\n"                                       \
+      "auto r = a && true && sandbox.invoke_sandbox_function(getBool);\n"      \
+      "\n"                                                                     \
+      "However the following would be allowed\n"                               \
+      "tainted<bool, T_Sbx> a = true;\n"                                       \
+      "auto b = true\n"                                                        \
+      "auto c = sandbox.invoke_sandbox_function(getBool);\n"                   \
+      "auto r = a && b && c;\n"                                                \
+      "\n"                                                                     \
+      "Note that these 2 programs are not identical. The first program may "   \
+      "or may not call getBool, while second program always calls getBool");   \
+    return tainted<bool, T_Sbx>(false);                                        \
+  }                                                                            \
+  RLBOX_REQUIRE_SEMI_COLON
+
+BooleanBinaryOpWrappedRhs(&&);
+BooleanBinaryOpWrappedRhs(||);
+#undef BooleanBinaryOpWrappedRhs
+
+namespace tainted_detail {
+  template<typename T, typename T_Sbx>
+  using tainted_repr_t = detail::c_to_std_array_t<T>;
+
+  template<typename T, typename T_Sbx>
+  using tainted_vol_repr_t =
+    detail::c_to_std_array_t<std::add_volatile_t<typename rlbox_sandbox<
+      T_Sbx>::template convert_to_sandbox_equivalent_nonclass_t<T>>>;
+}
+
+/**
+ * @brief Tainted values represent untrusted values that originate from the
+ * sandbox.
+ */
+template<typename T, typename T_Sbx>
+class tainted : public tainted_base_impl<tainted, T, T_Sbx>
+{
+  KEEP_CLASSES_FRIENDLY
+  KEEP_CAST_FRIENDLY
+
+  // Classes recieve their own specialization
+  static_assert(
+    !std::is_class_v<T>,
+    "Missing definition for class T. This error occurs for one "
+    "of 2 reasons.\n"
+    "  1) Make sure you have include a call rlbox_load_structs_from_library "
+    "for this library with this class included.\n"
+    "  2) Make sure you run (re-run) the struct-dump tool to list "
+    "all structs in use by your program.\n");
+
+  static_assert(
+    detail::is_basic_type_v<T> || std::is_array_v<T>,
+    "Tainted types only support fundamental, enum, pointer, array and struct "
+    "types. Please file a bug if more support is needed.");
+
+private:
+  using T_ClassBase = tainted_base_impl<tainted, T, T_Sbx>;
+  using T_AppType = tainted_detail::tainted_repr_t<T, T_Sbx>;
+  using T_SandboxedType = tainted_detail::tainted_vol_repr_t<T, T_Sbx>;
+  T_AppType data;
+
+  inline auto& get_raw_value_ref() noexcept { return data; }
+  inline auto& get_raw_value_ref() const noexcept { return data; }
+
+  inline std::remove_cv_t<T_AppType> get_raw_value() const noexcept
+  {
+    return data;
+  }
+
+  inline std::remove_cv_t<T_SandboxedType> get_raw_sandbox_value(
+    rlbox_sandbox<T_Sbx>& sandbox) const
+  {
+    std::remove_cv_t<T_SandboxedType> ret;
+
+    using namespace detail;
+    convert_type_non_class<T_Sbx,
+                           adjust_type_direction::TO_SANDBOX,
+                           adjust_type_context::SANDBOX>(
+      ret, data, nullptr /* example_unsandboxed_ptr */, &sandbox);
+    return ret;
+  };
+
+  inline const void* find_example_pointer_or_null() const noexcept
+  {
+    if constexpr (std::is_array_v<T>) {
+      auto& data_ref = get_raw_value_ref();
+
+      for (size_t i = 0; i < std::extent_v<T>; i++) {
+        const void* ret = data[i].find_example_pointer_or_null();
+        if (ret != nullptr) {
+          return ret;
+        }
+      }
+    } else if constexpr (std::is_pointer_v<T> && !detail::is_func_ptr_v<T>) {
+      auto data = get_raw_value();
+      return data;
+    }
+    return nullptr;
+  }
+
+  // Initializing with a pointer is dangerous and permitted only internally
+  template<typename T2 = T, RLBOX_ENABLE_IF(std::is_pointer_v<T2>)>
+  tainted(T2 val, const void* /* internal_tag */)
+    : data(val)
+  {
+    // Sanity check
+    static_assert(std::is_pointer_v<T>);
+  }
+
+  template<typename T_Rhs>
+  static inline tainted<T, T_Sbx> internal_factory(T_Rhs&& rhs)
+  {
+    if constexpr (std::is_pointer_v<std::remove_reference_t<T_Rhs>>) {
+      const void* internal_tag = nullptr;
+      return tainted(std::forward<T_Rhs>(rhs), internal_tag);
+    } else {
+      return tainted(std::forward<T_Rhs>(rhs));
+    }
+  }
+
+public:
+  tainted() = default;
+  tainted(const tainted<T, T_Sbx>& p) = default;
+
+  tainted(const tainted_volatile<T, T_Sbx>& p)
+  {
+    // Need to construct an example_unsandboxed_ptr for pointers or arrays of
+    // pointers. Since tainted_volatile is the type of data in sandbox memory,
+    // the address of data (&data) refers to a location in sandbox memory and
+    // can thus be the example_unsandboxed_ptr
+    const volatile void* p_data_ref = &p.get_sandbox_value_ref();
+    const void* example_unsandboxed_ptr = const_cast<const void*>(p_data_ref);
+    using namespace detail;
+    convert_type_non_class<T_Sbx,
+                           adjust_type_direction::TO_APPLICATION,
+                           adjust_type_context::EXAMPLE>(
+      get_raw_value_ref(),
+      p.get_sandbox_value_ref(),
+      example_unsandboxed_ptr,
+      nullptr /* sandbox_ptr */);
+  }
+
+  // Initializing with a pointer is dangerous and permitted only internally
+  template<typename T2 = T, RLBOX_ENABLE_IF(std::is_pointer_v<T2>)>
+  tainted(T2 val)
+    : data(val)
+  {
+    rlbox_detail_static_fail_because(
+      std::is_pointer_v<T2>,
+      "Assignment of pointers is not safe as it could\n "
+      "1) Leak pointers from the appliction to the sandbox which may break "
+      "ASLR\n "
+      "2) Pass inaccessible pointers to the sandbox leading to crash\n "
+      "3) Break sandboxes that require pointers to be swizzled first\n "
+      "\n "
+      "Instead, if you want to pass in a pointer, do one of the following\n "
+      "1) Allocate with malloc_in_sandbox, and pass in a tainted pointer\n "
+      "2) For pointers that point to functions in the application, register "
+      "with sandbox.register_callback(\"foo\"), and pass in the registered "
+      "value\n "
+      "3) For pointers that point to functions in the sandbox, get the "
+      "address with get_sandbox_function_address(sandbox, foo), and pass in "
+      "the "
+      "address\n "
+      "4) For raw pointers, use assign_raw_pointer which performs required "
+      "safety checks\n ");
+  }
+
+  tainted(
+    const sandbox_callback<
+      detail::function_ptr_t<T> // Need to ensure we never generate code that
+                                // creates a sandbox_callback of a non function
+      ,
+      T_Sbx>&)
+  {
+    rlbox_detail_static_fail_because(
+      detail::true_v<T>,
+      "RLBox does not support assigning sandbox_callback values to tainted "
+      "types (i.e. types that live in application memory).\n"
+      "If you still want to do this, consider changing your code to store the "
+      "value in sandbox memory as follows. Convert\n\n"
+      "sandbox_callback<T_Func, Sbx> cb = ...;\n"
+      "tainted<T_Func, Sbx> foo = cb;\n\n"
+      "to\n\n"
+      "tainted<T_Func*, Sbx> foo_ptr = sandbox.malloc_in_sandbox<T_Func*>();\n"
+      "*foo_ptr = cb;\n\n"
+      "This would keep the assignment in sandbox memory");
+  }
+
+  tainted(const std::nullptr_t& arg)
+    : data(arg)
+  {
+    static_assert(std::is_pointer_v<T>);
+  }
+
+  // We explicitly disable this constructor if it has one of the signatures
+  // above, so that we give the above constructors a higher priority. We only
+  // allow this for fundamental types as this is potentially unsafe for pointers
+  // and structs
+  template<typename T_Arg,
+           RLBOX_ENABLE_IF(
+             !detail::rlbox_is_wrapper_v<std::remove_reference_t<T_Arg>> &&
+             detail::is_fundamental_or_enum_v<T> &&
+             detail::is_fundamental_or_enum_v<std::remove_reference_t<T_Arg>>)>
+  tainted(T_Arg&& arg)
+    : data(std::forward<T_Arg>(arg))
+  {}
+
+  template<typename T_Rhs>
+  void assign_raw_pointer(rlbox_sandbox<T_Sbx>& sandbox, T_Rhs val)
+  {
+    static_assert(std::is_pointer_v<T_Rhs>, "Must be a pointer");
+    static_assert(std::is_assignable_v<T&, T_Rhs>,
+                  "Should assign pointers of compatible types.");
+    // Maybe a function pointer, so we need to cast
+    const void* cast_val = reinterpret_cast<const void*>(val);
+    bool safe = sandbox.is_pointer_in_sandbox_memory(cast_val);
+    detail::dynamic_check(
+      safe,
+      "Tried to assign a pointer that is not in the sandbox.\n "
+      "This is not safe as it could\n "
+      "1) Leak pointers from the appliction to the sandbox which may break "
+      "ASLR\n "
+      "2) Pass inaccessible pointers to the sandbox leading to crash\n "
+      "3) Break sandboxes that require pointers to be swizzled first\n "
+      "\n "
+      "Instead, if you want to pass in a pointer, do one of the following\n "
+      "1) Allocate with malloc_in_sandbox, and pass in a tainted pointer\n "
+      "2) For pointers that point to functions in the application, register "
+      "with sandbox.register_callback(\"foo\"), and pass in the registered "
+      "value\n "
+      "3) For pointers that point to functions in the sandbox, get the "
+      "address with get_sandbox_function_address(sandbox, foo), and pass in "
+      "the "
+      "address\n ");
+    data = val;
+  }
+
+  inline tainted_opaque<T, T_Sbx> to_opaque()
+  {
+    return *reinterpret_cast<tainted_opaque<T, T_Sbx>*>(this);
+  }
+
+  template<typename T_Dummy = void>
+  operator bool() const
+  {
+    if_constexpr_named(cond1, std::is_pointer_v<T>)
+    {
+      // We return this without the tainted wrapper as the checking for null
+      // doesn't really "induce" tainting in the application If the
+      // application is checking this pointer for null, then it is robust to
+      // this pointer being null or not null
+      return get_raw_value() != nullptr;
+    }
+    else
+    {
+      auto unknownCase = !(cond1);
+      rlbox_detail_static_fail_because(
+        unknownCase,
+        "Implicit conversion to bool is only permitted for pointer types. For "
+        "other types, unwrap the tainted value with the copy_and_verify API "
+        "and then perform the required checks");
+    }
+  }
+};
+
+template<typename T, typename T_Sbx>
+inline tainted<T, T_Sbx> from_opaque(tainted_opaque<T, T_Sbx> val)
+{
+  return *reinterpret_cast<tainted<T, T_Sbx>*>(&val);
+}
+
+/**
+ * @brief Tainted volatile values are like tainted values but still point to
+ * sandbox memory. Dereferencing a tainted pointer produces a tainted_volatile.
+ */
+template<typename T, typename T_Sbx>
+class tainted_volatile : public tainted_base_impl<tainted_volatile, T, T_Sbx>
+{
+  KEEP_CLASSES_FRIENDLY
+  KEEP_CAST_FRIENDLY
+
+  // Classes recieve their own specialization
+  static_assert(
+    !std::is_class_v<T>,
+    "Missing definition for class T. This error occurs for one "
+    "of 2 reasons.\n"
+    "  1) Make sure you have include a call rlbox_load_structs_from_library "
+    "for this library with this class included.\n"
+    "  2) Make sure you run (re-run) the struct-dump tool to list "
+    "all structs in use by your program.\n");
+
+  static_assert(
+    detail::is_basic_type_v<T> || std::is_array_v<T>,
+    "Tainted types only support fundamental, enum, pointer, array and struct "
+    "types. Please file a bug if more support is needed.");
+
+private:
+  using T_ClassBase = tainted_base_impl<tainted_volatile, T, T_Sbx>;
+  using T_AppType = tainted_detail::tainted_repr_t<T, T_Sbx>;
+  using T_SandboxedType = tainted_detail::tainted_vol_repr_t<T, T_Sbx>;
+  T_SandboxedType data;
+
+  inline auto& get_sandbox_value_ref() noexcept { return data; }
+  inline auto& get_sandbox_value_ref() const noexcept { return data; }
+
+  inline std::remove_cv_t<T_AppType> get_raw_value() const
+  {
+    std::remove_cv_t<T_AppType> ret;
+    // Need to construct an example_unsandboxed_ptr for pointers or arrays of
+    // pointers. Since tainted_volatile is the type of data in sandbox memory,
+    // the address of data (&data) refers to a location in sandbox memory and
+    // can thus be the example_unsandboxed_ptr
+    const volatile void* data_ref = &data;
+    const void* example_unsandboxed_ptr = const_cast<const void*>(data_ref);
+    using namespace detail;
+    convert_type_non_class<T_Sbx,
+                           adjust_type_direction::TO_APPLICATION,
+                           adjust_type_context::EXAMPLE>(
+      ret, data, example_unsandboxed_ptr, nullptr /* sandbox_ptr */);
+    return ret;
+  }
+
+  inline std::remove_cv_t<T_SandboxedType> get_raw_sandbox_value()
+    const noexcept
+  {
+    return data;
+  };
+
+  inline std::remove_cv_t<T_SandboxedType> get_raw_sandbox_value(
+    rlbox_sandbox<T_Sbx>& sandbox) const noexcept
+  {
+    RLBOX_UNUSED(sandbox);
+    return data;
+  };
+
+  tainted_volatile() = default;
+  tainted_volatile(const tainted_volatile<T, T_Sbx>& p) = default;
+
+public:
+  inline tainted<const T*, T_Sbx> operator&() const noexcept
+  {
+    auto ref =
+      detail::remove_volatile_from_ptr_cast(&this->get_sandbox_value_ref());
+    auto ref_cast = reinterpret_cast<const T*>(ref);
+    return tainted<const T*, T_Sbx>::internal_factory(ref_cast);
+  }
+
+  inline tainted<T*, T_Sbx> operator&() noexcept
+  {
+    return sandbox_const_cast<T*>(&std::as_const(*this));
+  }
+
+  // Needed as the definition of unary & above shadows the base's binary &
+  rlbox_detail_forward_binop_to_base(&, T_ClassBase);
+
+  template<typename T_RhsRef>
+  inline tainted_volatile<T, T_Sbx>& operator=(T_RhsRef&& val)
+  {
+    using T_Rhs = std::remove_reference_t<T_RhsRef>;
+    using T_Rhs_El = std::remove_all_extents_t<T_Rhs>;
+
+    // Need to construct an example_unsandboxed_ptr for pointers or arrays of
+    // pointers. Since tainted_volatile is the type of data in sandbox memory,
+    // the address of data (&data) refers to a location in sandbox memory and
+    // can thus be the example_unsandboxed_ptr
+    const volatile void* data_ref = &get_sandbox_value_ref();
+    const void* example_unsandboxed_ptr = const_cast<const void*>(data_ref);
+    // Some branches don't use this
+    RLBOX_UNUSED(example_unsandboxed_ptr);
+
+    if_constexpr_named(
+      cond1, std::is_same_v<std::remove_const_t<T_Rhs>, std::nullptr_t>)
+    {
+      static_assert(std::is_pointer_v<T>,
+                    "Null pointer can only be assigned to pointers");
+      // assign using an integer instead of nullptr, as the pointer field may be
+      // represented as integer
+      data = 0;
+    }
+    else if_constexpr_named(cond2, detail::rlbox_is_tainted_v<T_Rhs>)
+    {
+      using namespace detail;
+      convert_type_non_class<T_Sbx,
+                             adjust_type_direction::TO_SANDBOX,
+                             adjust_type_context::EXAMPLE>(
+        get_sandbox_value_ref(),
+        val.get_raw_value_ref(),
+        example_unsandboxed_ptr,
+        nullptr /* sandbox_ptr */);
+    }
+    else if_constexpr_named(cond3, detail::rlbox_is_tainted_volatile_v<T_Rhs>)
+    {
+      using namespace detail;
+      convert_type_non_class<T_Sbx,
+                             adjust_type_direction::NO_CHANGE,
+                             adjust_type_context::EXAMPLE>(
+        get_sandbox_value_ref(),
+        val.get_sandbox_value_ref(),
+        example_unsandboxed_ptr,
+        nullptr /* sandbox_ptr */);
+    }
+    else if_constexpr_named(cond4, detail::rlbox_is_sandbox_callback_v<T_Rhs>)
+    {
+      using T_RhsFunc = detail::rlbox_remove_wrapper_t<T_Rhs>;
+
+      // need to perform some typechecking to ensure we are assigning compatible
+      // function pointer types only
+      if_constexpr_named(subcond1, !std::is_assignable_v<T&, T_RhsFunc>)
+      {
+        rlbox_detail_static_fail_because(
+          subcond1,
+          "Trying to assign function pointer to field of incompatible types");
+      }
+      else
+      {
+        // Need to reinterpret_cast as the representation of the signature of a
+        // callback uses the machine model of the sandbox, while the field uses
+        // that of the application. But we have already checked above that this
+        // is safe.
+        auto func = val.get_raw_sandbox_value();
+        using T_Cast = std::remove_volatile_t<T_SandboxedType>;
+        get_sandbox_value_ref() = (T_Cast)func;
+      }
+    }
+    else if_constexpr_named(
+      cond5,
+      detail::is_fundamental_or_enum_v<T> ||
+        (std::is_array_v<T> && !std::is_pointer_v<T_Rhs_El>))
+    {
+      detail::convert_type_fundamental_or_array(get_sandbox_value_ref(), val);
+    }
+    else if_constexpr_named(
+      cond6, std::is_pointer_v<T_Rhs> || std::is_pointer_v<T_Rhs_El>)
+    {
+      rlbox_detail_static_fail_because(
+        cond6,
+        "Assignment of pointers is not safe as it could\n "
+        "1) Leak pointers from the appliction to the sandbox which may break "
+        "ASLR\n "
+        "2) Pass inaccessible pointers to the sandbox leading to crash\n "
+        "3) Break sandboxes that require pointers to be swizzled first\n "
+        "\n "
+        "Instead, if you want to pass in a pointer, do one of the following\n "
+        "1) Allocate with malloc_in_sandbox, and pass in a tainted pointer\n "
+        "2) For pointers that point to functions in the application, register "
+        "with sandbox.register_callback(\"foo\"), and pass in the registered "
+        "value\n "
+        "3) For pointers that point to functions in the sandbox, get the "
+        "address with get_sandbox_function_address(sandbox, foo), and pass in "
+        "the "
+        "address\n "
+        "4) For raw pointers, use assign_raw_pointer which performs required "
+        "safety checks\n ");
+    }
+    else
+    {
+      auto unknownCase =
+        !(cond1 || cond2 || cond3 || cond4 || cond5 /* || cond6 */);
+      rlbox_detail_static_fail_because(
+        unknownCase, "Assignment of the given type of value is not supported");
+    }
+
+    return *this;
+  }
+
+  template<typename T_Rhs>
+  void assign_raw_pointer(rlbox_sandbox<T_Sbx>& sandbox, T_Rhs val)
+  {
+    static_assert(std::is_pointer_v<T_Rhs>, "Must be a pointer");
+    static_assert(std::is_assignable_v<T&, T_Rhs>,
+                  "Should assign pointers of compatible types.");
+    // Maybe a function pointer, so we need to cast
+    const void* cast_val = reinterpret_cast<const void*>(val);
+    bool safe = sandbox.is_pointer_in_sandbox_memory(cast_val);
+    detail::dynamic_check(
+      safe,
+      "Tried to assign a pointer that is not in the sandbox.\n "
+      "This is not safe as it could\n "
+      "1) Leak pointers from the appliction to the sandbox which may break "
+      "ASLR\n "
+      "2) Pass inaccessible pointers to the sandbox leading to crash\n "
+      "3) Break sandboxes that require pointers to be swizzled first\n "
+      "\n "
+      "Instead, if you want to pass in a pointer, do one of the following\n "
+      "1) Allocate with malloc_in_sandbox, and pass in a tainted pointer\n "
+      "2) For pointers that point to functions in the application, register "
+      "with sandbox.register_callback(\"foo\"), and pass in the registered "
+      "value\n "
+      "3) For pointers that point to functions in the sandbox, get the "
+      "address with get_sandbox_function_address(sandbox, foo), and pass in "
+      "the "
+      "address\n ");
+    get_sandbox_value_ref() =
+      sandbox.template get_sandboxed_pointer<T_Rhs>(cast_val);
+  }
+
+  template<typename T_Dummy = void>
+  operator bool() const
+  {
+    rlbox_detail_static_fail_because(
+      detail::true_v<T_Dummy>,
+      "Cannot apply implicit conversion to bool on values that are located in "
+      "sandbox memory. This error occurs if you compare a dereferenced value "
+      "such as the code shown below\n\n"
+      "tainted<int**> a = ...;\n"
+      "assert(*a);\n\n"
+      "Instead you can write this code as \n"
+      "tainted<int*> temp = *a;\n"
+      "assert(temp);\n");
+    return false;
+  }
+};
+
+}
diff --git a/third_party/rlbox/include/rlbox_app_pointer.hpp b/third_party/rlbox/include/rlbox_app_pointer.hpp
new file mode 100644
index 0000000000..5af4876867
--- /dev/null
+++ b/third_party/rlbox/include/rlbox_app_pointer.hpp
@@ -0,0 +1,93 @@
+#pragma once
+// IWYU pragma: private, include "rlbox.hpp"
+// IWYU pragma: friend "rlbox_.*\.hpp"
+
+#include <map>
+#ifndef RLBOX_USE_CUSTOM_SHARED_LOCK
+#  include <shared_mutex>
+#endif
+#include <type_traits>
+
+#include "rlbox_helpers.hpp"
+#include "rlbox_type_traits.hpp"
+#include "rlbox_types.hpp"
+
+namespace rlbox {
+
+template<typename T_PointerType>
+class app_pointer_map
+{
+
+private:
+  using T_PointerTypeUnsigned = detail::unsigned_int_of_size_t<T_PointerType>;
+
+  std::map<T_PointerTypeUnsigned, void*> pointer_map;
+  T_PointerTypeUnsigned counter = 1;
+#ifndef RLBOX_SINGLE_THREADED_INVOCATIONS
+  RLBOX_SHARED_LOCK(map_mutex);
+#endif
+
+  T_PointerType get_unused_index(T_PointerType max_ptr_val)
+  {
+    const auto max_val = (T_PointerTypeUnsigned)max_ptr_val;
+    for (T_PointerTypeUnsigned i = counter; i <= max_val; i++) {
+      if (pointer_map.find(i) == pointer_map.end()) {
+        counter = i + 1;
+        return (T_PointerType)i;
+      }
+    }
+    for (T_PointerTypeUnsigned i = 1; i < counter; i++) {
+      if (pointer_map.find(i) == pointer_map.end()) {
+        counter = i + 1;
+        return (T_PointerType)i;
+      }
+    }
+    detail::dynamic_check(false, "Could not find free app pointer slot");
+    return 0;
+  }
+
+public:
+  app_pointer_map()
+  {
+    // ensure we can't use app pointer 0 as this is sometimes confused as null
+    // by the sandbox
+    pointer_map[0] = nullptr;
+  }
+
+  T_PointerType get_app_pointer_idx(void* ptr, T_PointerType max_ptr_val)
+  {
+#ifndef RLBOX_SINGLE_THREADED_INVOCATIONS
+    RLBOX_ACQUIRE_UNIQUE_GUARD(lock, map_mutex);
+#endif
+    T_PointerType idx = get_unused_index(max_ptr_val);
+    T_PointerTypeUnsigned idx_int = (T_PointerTypeUnsigned)idx;
+    pointer_map[idx_int] = ptr;
+    return idx;
+  }
+
+  void remove_app_ptr(T_PointerType idx)
+  {
+#ifndef RLBOX_SINGLE_THREADED_INVOCATIONS
+    RLBOX_ACQUIRE_UNIQUE_GUARD(lock, map_mutex);
+#endif
+    T_PointerTypeUnsigned idx_int = (T_PointerTypeUnsigned)idx;
+    auto it = pointer_map.find(idx_int);
+    detail::dynamic_check(it != pointer_map.end(),
+                          "Error: removing a non-existing app pointer");
+    pointer_map.erase(it);
+  }
+
+  void* lookup_index(T_PointerType idx)
+  {
+#ifndef RLBOX_SINGLE_THREADED_INVOCATIONS
+    RLBOX_ACQUIRE_SHARED_GUARD(lock, map_mutex);
+#endif
+    T_PointerTypeUnsigned idx_int = (T_PointerTypeUnsigned)idx;
+    auto it = pointer_map.find(idx_int);
+    detail::dynamic_check(it != pointer_map.end(),
+                          "Error: looking up a non-existing app pointer");
+    return it->second;
+  }
+};
+
+}
\ No newline at end of file
diff --git a/third_party/rlbox/include/rlbox_conversion.hpp b/third_party/rlbox/include/rlbox_conversion.hpp
new file mode 100644
index 0000000000..e82d0d5da0
--- /dev/null
+++ b/third_party/rlbox/include/rlbox_conversion.hpp
@@ -0,0 +1,273 @@
+#pragma once
+// IWYU pragma: private, include "rlbox.hpp"
+// IWYU pragma: friend "rlbox_.*\.hpp"
+
+#include <array>
+#include <cstring>
+#include <limits>
+#include <type_traits>
+
+#include "rlbox_helpers.hpp"
+#include "rlbox_type_traits.hpp"
+#include "rlbox_types.hpp"
+
+namespace rlbox::detail {
+
+template<typename T_To, typename T_From>
+inline constexpr void convert_type_fundamental(T_To& to,
+                                               const volatile T_From& from)
+{
+  using namespace std;
+
+  if_constexpr_named(cond1, !is_fundamental_or_enum_v<T_To>)
+  {
+    rlbox_detail_static_fail_because(
+      cond1, "Conversion target should be fundamental or enum type");
+  }
+  else if_constexpr_named(cond2, !is_fundamental_or_enum_v<T_From>)
+  {
+    rlbox_detail_static_fail_because(
+      cond2, "Conversion source should be fundamental or enum type");
+  }
+  else if_constexpr_named(cond3, is_enum_v<T_To> || is_enum_v<T_From>)
+  {
+    static_assert(std::is_same_v<detail::remove_cv_ref_t<T_To>,
+                                 detail::remove_cv_ref_t<T_From>>);
+    to = from;
+  }
+  else if_constexpr_named(
+    cond4, is_floating_point_v<T_To> || is_floating_point_v<T_From>)
+  {
+    static_assert(is_floating_point_v<T_To> && is_floating_point_v<T_From>);
+    // language coerces different float types
+    to = from;
+  }
+  else if_constexpr_named(cond5, is_integral_v<T_To> || is_integral_v<T_From>)
+  {
+    static_assert(is_integral_v<T_To> && is_integral_v<T_From>);
+
+    const char* err_msg =
+      "Over/Underflow when converting between integer types";
+
+    // Some branches don't use the param
+    RLBOX_UNUSED(err_msg);
+
+    if constexpr (is_signed_v<T_To> == is_signed_v<T_From> &&
+                  sizeof(T_To) >= sizeof(T_From)) {
+      // Eg: int64_t from int32_t, uint64_t from uint32_t
+    } else if constexpr (is_unsigned_v<T_To> && is_unsigned_v<T_From>) {
+      // Eg: uint32_t from uint64_t
+      dynamic_check(from <= numeric_limits<T_To>::max(), err_msg);
+    } else if constexpr (is_signed_v<T_To> && is_signed_v<T_From>) {
+      // Eg: int32_t from int64_t
+      dynamic_check(from >= numeric_limits<T_To>::min(), err_msg);
+      dynamic_check(from <= numeric_limits<T_To>::max(), err_msg);
+    } else if constexpr (is_unsigned_v<T_To> && is_signed_v<T_From>) {
+      if constexpr (sizeof(T_To) < sizeof(T_From)) {
+        // Eg: uint32_t from int64_t
+        dynamic_check(from >= 0, err_msg);
+        auto to_max = numeric_limits<T_To>::max();
+        dynamic_check(from <= static_cast<T_From>(to_max), err_msg);
+      } else {
+        // Eg: uint32_t from int32_t, uint64_t from int32_t
+        dynamic_check(from >= 0, err_msg);
+      }
+    } else if constexpr (is_signed_v<T_To> && is_unsigned_v<T_From>) {
+      if constexpr (sizeof(T_To) <= sizeof(T_From)) {
+        // Eg: int32_t from uint32_t, int32_t from uint64_t
+        auto to_max = numeric_limits<T_To>::max();
+        dynamic_check(from <= static_cast<T_From>(to_max), err_msg);
+      } else {
+        // Eg: int64_t from uint32_t
+      }
+    }
+    to = static_cast<T_To>(from);
+  }
+  else
+  {
+    constexpr auto unknownCase = !(cond1 || cond2 || cond3 || cond4 || cond5);
+    rlbox_detail_static_fail_because(
+      unknownCase, "Unexpected case for convert_type_fundamental");
+  }
+}
+
+template<typename T_To, typename T_From>
+inline constexpr void convert_type_fundamental_or_array(T_To& to,
+                                                        const T_From& from)
+{
+  using namespace std;
+
+  using T_To_C = std_array_to_c_arr_t<T_To>;
+  using T_From_C = std_array_to_c_arr_t<T_From>;
+  using T_To_El = remove_all_extents_t<T_To_C>;
+  using T_From_El = remove_all_extents_t<T_From_C>;
+
+  if_constexpr_named(cond1, is_array_v<T_To_C> != is_array_v<T_From_C>)
+  {
+    rlbox_detail_static_fail_because(
+      cond1, "Conversion should not go between array and non array types");
+  }
+  else if constexpr (!is_array_v<T_To_C>)
+  {
+    convert_type_fundamental(to, from);
+  }
+  else if_constexpr_named(cond2, !all_extents_same<T_To_C, T_From_C>)
+  {
+    rlbox_detail_static_fail_because(
+      cond2, "Conversion between arrays should have same dimensions");
+  }
+  else if_constexpr_named(cond3,
+                          is_pointer_v<T_To_El> || is_pointer_v<T_From_El>)
+  {
+    rlbox_detail_static_fail_because(cond3,
+                                     "convert_type_fundamental_or_array "
+                                     "does not allow arrays of pointers");
+  }
+  else
+  {
+    // Explicitly using size to check for element type as we may be going across
+    // different types of the same width such as void* and uintptr_t
+    if constexpr (sizeof(T_To_El) == sizeof(T_From_El) &&
+                  is_signed_v<T_To_El> == is_signed_v<T_From_El>) {
+      // Sanity check - this should definitely be true
+      static_assert(sizeof(T_From_C) == sizeof(T_To_C));
+      std::memcpy(&to, &from, sizeof(T_To_C));
+    } else {
+      for (size_t i = 0; i < std::extent_v<T_To_C>; i++) {
+        convert_type_fundamental_or_array(to[i], from[i]);
+      }
+    }
+  }
+}
+
+enum class adjust_type_direction
+{
+  TO_SANDBOX,
+  TO_APPLICATION,
+  NO_CHANGE
+};
+
+enum class adjust_type_context
+{
+  EXAMPLE,
+  SANDBOX
+};
+
+template<typename T_Sbx,
+         adjust_type_direction Direction,
+         adjust_type_context Context,
+         typename T_To,
+         typename T_From>
+inline constexpr void convert_type_non_class(
+  T_To& to,
+  const T_From& from,
+  const void* example_unsandboxed_ptr,
+  rlbox_sandbox<T_Sbx>* sandbox_ptr)
+{
+  using namespace std;
+
+  // Some branches don't use the param
+  RLBOX_UNUSED(example_unsandboxed_ptr);
+  RLBOX_UNUSED(sandbox_ptr);
+
+  using T_To_C = std_array_to_c_arr_t<T_To>;
+  using T_From_C = std_array_to_c_arr_t<T_From>;
+  using T_To_El = remove_all_extents_t<T_To_C>;
+  using T_From_El = remove_all_extents_t<T_From_C>;
+
+  if constexpr (is_pointer_v<T_To_C> || is_pointer_v<T_From_C>) {
+
+    if constexpr (Direction == adjust_type_direction::NO_CHANGE) {
+
+      static_assert(is_pointer_v<T_To_C> && is_pointer_v<T_From_C> &&
+                    sizeof(T_To_C) == sizeof(T_From_C));
+      to = from;
+
+    } else if constexpr (Direction == adjust_type_direction::TO_SANDBOX) {
+
+      static_assert(is_pointer_v<T_From_C>);
+      // Maybe a function pointer, so convert
+      auto from_c = reinterpret_cast<const void*>(from);
+      if constexpr (Context == adjust_type_context::SANDBOX) {
+        RLBOX_DEBUG_ASSERT(sandbox_ptr != nullptr);
+        to = sandbox_ptr->template get_sandboxed_pointer<T_From_C>(from_c);
+      } else {
+        RLBOX_DEBUG_ASSERT(from_c == nullptr ||
+                           example_unsandboxed_ptr != nullptr);
+        to =
+          rlbox_sandbox<T_Sbx>::template get_sandboxed_pointer_no_ctx<T_From_C>(
+            from_c, example_unsandboxed_ptr);
+      }
+
+    } else if constexpr (Direction == adjust_type_direction::TO_APPLICATION) {
+
+      static_assert(is_pointer_v<T_To_C>);
+      if constexpr (Context == adjust_type_context::SANDBOX) {
+        RLBOX_DEBUG_ASSERT(sandbox_ptr != nullptr);
+        to = sandbox_ptr->template get_unsandboxed_pointer<T_To_C>(from);
+      } else {
+        RLBOX_DEBUG_ASSERT(from == 0 || example_unsandboxed_ptr != nullptr);
+        to =
+          rlbox_sandbox<T_Sbx>::template get_unsandboxed_pointer_no_ctx<T_To_C>(
+            from, example_unsandboxed_ptr);
+      }
+    }
+
+  } else if constexpr (is_pointer_v<T_To_El> || is_pointer_v<T_From_El>) {
+
+    if constexpr (Direction == adjust_type_direction::NO_CHANGE) {
+      // Sanity check - this should definitely be true
+      static_assert(sizeof(T_To_El) == sizeof(T_From_El) &&
+                    sizeof(T_From_C) == sizeof(T_To_C));
+      memcpy(&to, &from, sizeof(T_To_C));
+    } else {
+      for (size_t i = 0; i < std::extent_v<T_To_C>; i++) {
+        convert_type_non_class<T_Sbx, Direction, Context>(
+          to[i], from[i], example_unsandboxed_ptr, sandbox_ptr);
+      }
+    }
+
+  } else {
+    convert_type_fundamental_or_array(to, from);
+  }
+}
+
+// Structs implement their own convert_type by specializing this class
+// Have to do this via a class, as functions can't be partially specialized
+template<typename T_Sbx,
+         adjust_type_direction Direction,
+         adjust_type_context Context,
+         typename T_To,
+         typename T_From>
+class convert_type_class;
+// The specialization implements the following
+// {
+//   static inline void run(T_To& to,
+//                          const T_From& from,
+//                          const void* example_unsandboxed_ptr);
+// }
+
+template<typename T_Sbx,
+         adjust_type_direction Direction,
+         adjust_type_context Context,
+         typename T_To,
+         typename T_From>
+inline void convert_type(T_To& to,
+                         const T_From& from,
+                         const void* example_unsandboxed_ptr,
+                         rlbox_sandbox<T_Sbx>* sandbox_ptr)
+{
+  if constexpr ((std::is_class_v<T_To> ||
+                 std::is_class_v<T_From>)&&!detail::is_std_array_v<T_To> &&
+                !detail::is_std_array_v<T_From>) {
+    // Sanity check
+    static_assert(std::is_class_v<T_From> && std::is_class_v<T_To>);
+    convert_type_class<T_Sbx, Direction, Context, T_To, T_From>::run(
+      to, from, example_unsandboxed_ptr, sandbox_ptr);
+  } else {
+    convert_type_non_class<T_Sbx, Direction, Context>(
+      to, from, example_unsandboxed_ptr, sandbox_ptr);
+  }
+}
+
+}
\ No newline at end of file
diff --git a/third_party/rlbox/include/rlbox_dylib_sandbox.hpp b/third_party/rlbox/include/rlbox_dylib_sandbox.hpp
new file mode 100644
index 0000000000..9878674d71
--- /dev/null
+++ b/third_party/rlbox/include/rlbox_dylib_sandbox.hpp
@@ -0,0 +1,314 @@
+#pragma once
+
+#include <cstdint>
+#include <cstdlib>
+#include <mutex>
+#ifndef RLBOX_USE_CUSTOM_SHARED_LOCK
+#  include <shared_mutex>
+#endif
+#include <utility>
+
+#if defined(_WIN32)
+// Ensure the min/max macro in the header doesn't collide with functions in
+// std::
+#  ifndef NOMINMAX
+#    define NOMINMAX
+#  endif
+#  include <windows.h>
+#else
+#  include <dlfcn.h>
+#endif
+
+#include "rlbox_helpers.hpp"
+
+namespace rlbox {
+
+class rlbox_dylib_sandbox;
+
+struct rlbox_dylib_sandbox_thread_data
+{
+  rlbox_dylib_sandbox* sandbox;
+  uint32_t last_callback_invoked;
+};
+
+#ifdef RLBOX_EMBEDDER_PROVIDES_TLS_STATIC_VARIABLES
+
+rlbox_dylib_sandbox_thread_data* get_rlbox_dylib_sandbox_thread_data();
+#  define RLBOX_DYLIB_SANDBOX_STATIC_VARIABLES()                               \
+    thread_local rlbox::rlbox_dylib_sandbox_thread_data                        \
+      rlbox_dylib_sandbox_thread_info{ 0, 0 };                                 \
+    namespace rlbox {                                                          \
+      rlbox_dylib_sandbox_thread_data* get_rlbox_dylib_sandbox_thread_data()   \
+      {                                                                        \
+        return &rlbox_dylib_sandbox_thread_info;                               \
+      }                                                                        \
+    }                                                                          \
+    static_assert(true, "Enforce semi-colon")
+
+#endif
+
+/**
+ * @brief Class that implements the null sandbox. This sandbox doesn't actually
+ * provide any isolation and only serves as a stepping stone towards migrating
+ * an application to use the RLBox API.
+ */
+class rlbox_dylib_sandbox
+{
+public:
+  // Stick with the system defaults
+  using T_LongLongType = long long;
+  using T_LongType = long;
+  using T_IntType = int;
+  using T_PointerType = void*;
+  using T_ShortType = short;
+  // no-op sandbox can transfer buffers as there is no sandboxings
+  // Thus transfer is a noop
+  using can_grant_deny_access = void;
+  // if this plugin uses a separate function to lookup internal callbacks
+  using needs_internal_lookup_symbol = void;
+
+private:
+  void* sandbox = nullptr;
+
+  RLBOX_SHARED_LOCK(callback_mutex);
+  static inline const uint32_t MAX_CALLBACKS = 64;
+  void* callback_unique_keys[MAX_CALLBACKS]{ 0 };
+  void* callbacks[MAX_CALLBACKS]{ 0 };
+
+#ifndef RLBOX_EMBEDDER_PROVIDES_TLS_STATIC_VARIABLES
+  thread_local static inline rlbox_dylib_sandbox_thread_data thread_data{ 0,
+                                                                          0 };
+#endif
+
+  template<uint32_t N, typename T_Ret, typename... T_Args>
+  static T_Ret callback_trampoline(T_Args... params)
+  {
+#ifdef RLBOX_EMBEDDER_PROVIDES_TLS_STATIC_VARIABLES
+    auto& thread_data = *get_rlbox_dylib_sandbox_thread_data();
+#endif
+    thread_data.last_callback_invoked = N;
+    using T_Func = T_Ret (*)(T_Args...);
+    T_Func func;
+    {
+#ifndef RLBOX_SINGLE_THREADED_INVOCATIONS
+      RLBOX_ACQUIRE_SHARED_GUARD(lock, thread_data.sandbox->callback_mutex);
+#endif
+      func = reinterpret_cast<T_Func>(thread_data.sandbox->callbacks[N]);
+    }
+    // Callbacks are invoked through function pointers, cannot use std::forward
+    // as we don't have caller context for T_Args, which means they are all
+    // effectively passed by value
+    return func(params...);
+  }
+
+protected:
+#if defined(_WIN32)
+  using path_buf = const LPCWSTR;
+#else
+  using path_buf = const char*;
+#endif
+
+  inline void impl_create_sandbox(path_buf path)
+  {
+#if defined(_WIN32)
+    sandbox = (void*)LoadLibraryW(path);
+#else
+    sandbox = dlopen(path, RTLD_LAZY | RTLD_LOCAL);
+#endif
+
+    if (!sandbox) {
+      std::string error_msg = "Could not load dynamic library: ";
+#if defined(_WIN32)
+      DWORD errorMessageID = GetLastError();
+      if (errorMessageID != 0) {
+        LPSTR messageBuffer = nullptr;
+        // The api creates the buffer that holds the message
+        size_t size = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER |
+                                       FORMAT_MESSAGE_FROM_SYSTEM |
+                                       FORMAT_MESSAGE_IGNORE_INSERTS,
+                                     NULL,
+                                     errorMessageID,
+                                     MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+                                     (LPSTR)&messageBuffer,
+                                     0,
+                                     NULL);
+        // Copy the error message into a std::string.
+        std::string message(messageBuffer, size);
+        error_msg += message;
+        LocalFree(messageBuffer);
+      }
+#else
+      error_msg += dlerror();
+#endif
+      detail::dynamic_check(false, error_msg.c_str());
+    }
+  }
+
+  inline void impl_destroy_sandbox()
+  {
+#if defined(_WIN32)
+    FreeLibrary((HMODULE)sandbox);
+#else
+    dlclose(sandbox);
+#endif
+    sandbox = nullptr;
+  }
+
+  template<typename T>
+  inline void* impl_get_unsandboxed_pointer(T_PointerType p) const
+  {
+    return p;
+  }
+
+  template<typename T>
+  inline T_PointerType impl_get_sandboxed_pointer(const void* p) const
+  {
+    return const_cast<T_PointerType>(p);
+  }
+
+  template<typename T>
+  static inline void* impl_get_unsandboxed_pointer_no_ctx(
+    T_PointerType p,
+    const void* /* example_unsandboxed_ptr */,
+    rlbox_dylib_sandbox* (* // Func ptr
+                          /* param: expensive_sandbox_finder */)(
+      const void* example_unsandboxed_ptr))
+  {
+    return p;
+  }
+
+  template<typename T>
+  static inline T_PointerType impl_get_sandboxed_pointer_no_ctx(
+    const void* p,
+    const void* /* example_unsandboxed_ptr */,
+    rlbox_dylib_sandbox* (* // Func ptr
+                          /* param: expensive_sandbox_finder */)(
+      const void* example_unsandboxed_ptr))
+  {
+    return const_cast<T_PointerType>(p);
+  }
+
+  inline T_PointerType impl_malloc_in_sandbox(size_t size)
+  {
+    void* p = malloc(size);
+    return p;
+  }
+
+  inline void impl_free_in_sandbox(T_PointerType p) { free(p); }
+
+  static inline bool impl_is_in_same_sandbox(const void*, const void*)
+  {
+    return true;
+  }
+
+  inline bool impl_is_pointer_in_sandbox_memory(const void*) { return true; }
+  inline bool impl_is_pointer_in_app_memory(const void*) { return true; }
+
+  inline size_t impl_get_total_memory()
+  {
+    return std::numeric_limits<size_t>::max();
+  }
+
+  inline void* impl_get_memory_location()
+  {
+    // There isn't any sandbox memory for the dylib_sandbox as we just redirect
+    // to the app. Also, this is mostly used for pointer swizzling or sandbox
+    // bounds checks which is also not present/not required. So we can just
+    // return null
+    return nullptr;
+  }
+
+  void* impl_lookup_symbol(const char* func_name)
+  {
+#if defined(_WIN32)
+    void* ret = GetProcAddress((HMODULE)sandbox, func_name);
+#else
+    void* ret = dlsym(sandbox, func_name);
+#endif
+    detail::dynamic_check(ret != nullptr, "Symbol not found");
+    return ret;
+  }
+
+  void* impl_internal_lookup_symbol(const char* func_name)
+  {
+    return impl_lookup_symbol(func_name);
+  }
+
+  template<typename T, typename T_Converted, typename... T_Args>
+  auto impl_invoke_with_func_ptr(T_Converted* func_ptr, T_Args&&... params)
+  {
+#ifdef RLBOX_EMBEDDER_PROVIDES_TLS_STATIC_VARIABLES
+    auto& thread_data = *get_rlbox_dylib_sandbox_thread_data();
+#endif
+    auto old_sandbox = thread_data.sandbox;
+    thread_data.sandbox = this;
+    auto on_exit = detail::make_scope_exit([&] {
+      thread_data.sandbox = old_sandbox;
+    });
+    return (*func_ptr)(params...);
+  }
+
+  template<typename T_Ret, typename... T_Args>
+  inline T_PointerType impl_register_callback(void* key, void* callback)
+  {
+    RLBOX_ACQUIRE_UNIQUE_GUARD(lock, callback_mutex);
+
+    void* chosen_trampoline = nullptr;
+
+    // need a compile time for loop as we we need I to be a compile time value
+    // this is because we are returning the I'th callback trampoline
+    detail::compile_time_for<MAX_CALLBACKS>([&](auto I) {
+      if (!chosen_trampoline && callback_unique_keys[I.value] == nullptr) {
+        callback_unique_keys[I.value] = key;
+        callbacks[I.value] = callback;
+        chosen_trampoline = reinterpret_cast<void*>(
+          callback_trampoline<I.value, T_Ret, T_Args...>);
+      }
+    });
+
+    return reinterpret_cast<T_PointerType>(chosen_trampoline);
+  }
+
+  static inline std::pair<rlbox_dylib_sandbox*, void*>
+  impl_get_executed_callback_sandbox_and_key()
+  {
+#ifdef RLBOX_EMBEDDER_PROVIDES_TLS_STATIC_VARIABLES
+    auto& thread_data = *get_rlbox_dylib_sandbox_thread_data();
+#endif
+    auto sandbox = thread_data.sandbox;
+    auto callback_num = thread_data.last_callback_invoked;
+    void* key = sandbox->callback_unique_keys[callback_num];
+    return std::make_pair(sandbox, key);
+  }
+
+  template<typename T_Ret, typename... T_Args>
+  inline void impl_unregister_callback(void* key)
+  {
+    RLBOX_ACQUIRE_UNIQUE_GUARD(lock, callback_mutex);
+    for (uint32_t i = 0; i < MAX_CALLBACKS; i++) {
+      if (callback_unique_keys[i] == key) {
+        callback_unique_keys[i] = nullptr;
+        callbacks[i] = nullptr;
+        break;
+      }
+    }
+  }
+
+  template<typename T>
+  inline T* impl_grant_access(T* src, size_t num, bool& success)
+  {
+    RLBOX_UNUSED(num);
+    success = true;
+    return src;
+  }
+
+  template<typename T>
+  inline T* impl_deny_access(T* src, size_t num, bool& success)
+  {
+    RLBOX_UNUSED(num);
+    success = true;
+    return src;
+  }
+};
+
+}
diff --git a/third_party/rlbox/include/rlbox_helpers.hpp b/third_party/rlbox/include/rlbox_helpers.hpp
new file mode 100644
index 0000000000..04c3294693
--- /dev/null
+++ b/third_party/rlbox/include/rlbox_helpers.hpp
@@ -0,0 +1,216 @@
+#pragma once
+// IWYU pragma: private, include "rlbox.hpp"
+// IWYU pragma: friend "rlbox_.*\.hpp"
+
+#include <cstdlib>
+#include <iostream>
+#include <stdexcept>
+#include <type_traits>
+#include <utility>
+#ifndef RLBOX_USE_CUSTOM_SHARED_LOCK
+#  include <mutex>
+#endif
+
+#include "rlbox_stdlib_polyfill.hpp"
+
+namespace rlbox {
+namespace detail {
+  const int CompileErrorCode = 42;
+
+  inline void dynamic_check(bool check, const char* const msg)
+  {
+    // clang-format off
+  if (!check) {
+    #if __cpp_exceptions && defined(RLBOX_USE_EXCEPTIONS)
+      throw std::runtime_error(msg);
+    #else
+      #ifdef RLBOX_CUSTOM_ABORT
+        RLBOX_CUSTOM_ABORT(msg);
+      #else
+        std::cerr << msg << std::endl;
+        std::abort();
+      #endif
+    #endif
+  }
+    // clang-format on
+  }
+
+#ifdef RLBOX_NO_COMPILE_CHECKS
+#  if __cpp_exceptions && defined(RLBOX_USE_EXCEPTIONS)
+#    define rlbox_detail_static_fail_because(CondExpr, Message)                \
+      ((void)(CondExpr)), throw std::runtime_error(Message)
+#  else
+#    define rlbox_detail_static_fail_because(CondExpr, Message) abort()
+#  endif
+#else
+#  define rlbox_detail_static_fail_because(CondExpr, Message)                  \
+    static_assert(!(CondExpr), Message)
+#endif
+
+#ifdef RLBOX_ENABLE_DEBUG_ASSERTIONS
+#  define RLBOX_DEBUG_ASSERT(...)                                              \
+    ::rlbox::detail::dynamic_check(__VA_ARGS__, "Debug assertion failed")
+#else
+#  define RLBOX_DEBUG_ASSERT(...) (void)0
+#endif
+
+#define RLBOX_UNUSED(...) (void)__VA_ARGS__
+
+#define RLBOX_REQUIRE_SEMI_COLON static_assert(true)
+
+#define if_constexpr_named(varName, ...)                                       \
+  if constexpr (constexpr auto varName = __VA_ARGS__; varName)
+
+  template<typename... TArgs>
+  void printTypes()
+  {
+#if defined(__clang__) || defined(__GNUC__) || defined(__GNUG__)
+    std::cout << __PRETTY_FUNCTION__ << std::endl; // NOLINT
+#elif defined(_MSC_VER)
+    std::cout << __FUNCSIG__ << std::endl; // NOLINT
+#else
+    std::cout << "Unsupported" << std::endl;
+#endif
+  }
+
+// Create an extension point so applications can provide their own shared lock
+// implementation
+#ifndef RLBOX_USE_CUSTOM_SHARED_LOCK
+#  define RLBOX_SHARED_LOCK(name) std::shared_timed_mutex name
+#  define RLBOX_ACQUIRE_SHARED_GUARD(name, ...)                                \
+    std::shared_lock<std::shared_timed_mutex> name(__VA_ARGS__)
+#  define RLBOX_ACQUIRE_UNIQUE_GUARD(name, ...)                                \
+    std::unique_lock<std::shared_timed_mutex> name(__VA_ARGS__)
+#else
+#  if !defined(RLBOX_SHARED_LOCK) || !defined(RLBOX_ACQUIRE_SHARED_GUARD) ||   \
+    !defined(RLBOX_ACQUIRE_UNIQUE_GUARD)
+#    error                                                                     \
+      "RLBOX_USE_CUSTOM_SHARED_LOCK defined but missing definitions for RLBOX_SHARED_LOCK, RLBOX_ACQUIRE_SHARED_GUARD, RLBOX_ACQUIRE_UNIQUE_GUARD"
+#  endif
+#endif
+
+#define rlbox_detail_forward_binop_to_base(opSymbol, ...)                      \
+  template<typename T_Rhs>                                                     \
+  inline auto operator opSymbol(T_Rhs rhs)                                     \
+  {                                                                            \
+    auto b = static_cast<__VA_ARGS__*>(this);                                  \
+    return (*b)opSymbol rhs;                                                   \
+  }                                                                            \
+  RLBOX_REQUIRE_SEMI_COLON
+
+  template<typename T>
+  inline auto remove_volatile_from_ptr_cast(T* ptr)
+  {
+    using T_Result = std::add_pointer_t<std::remove_volatile_t<T>>;
+    return const_cast<T_Result>(ptr);
+  }
+
+  // https://stackoverflow.com/questions/37602057/why-isnt-a-for-loop-a-compile-time-expression
+  namespace compile_time_for_detail {
+    template<std::size_t N>
+    struct num
+    {
+      static const constexpr auto value = N;
+    };
+
+    template<class F, std::size_t... Is>
+    inline void compile_time_for_helper(F func, std::index_sequence<Is...>)
+    {
+      (func(num<Is>{}), ...);
+    }
+  }
+
+  template<std::size_t N, typename F>
+  inline void compile_time_for(F func)
+  {
+    compile_time_for_detail::compile_time_for_helper(
+      func, std::make_index_sequence<N>());
+  }
+
+  template<typename T, typename T2>
+  [[nodiscard]] inline auto return_first_result(T first_task, T2 second_task)
+  {
+    using T_Result = rlbox::detail::polyfill::invoke_result_t<T>;
+
+    if constexpr (std::is_void_v<T_Result>) {
+      first_task();
+      second_task();
+    } else {
+      auto val = first_task();
+      second_task();
+      return val;
+    }
+  }
+
+  // Scope Exit guards
+  template<typename T_ExitFunc>
+  class scope_exit
+  {
+    T_ExitFunc exit_func;
+    bool released;
+
+  public:
+    explicit scope_exit(T_ExitFunc&& cleanup)
+      : exit_func(cleanup)
+      , released(true)
+    {}
+
+    scope_exit(scope_exit&& rhs)
+      : exit_func(std::move(rhs.exit_func))
+      , released(rhs.released)
+    {
+      rhs.release();
+    }
+
+    ~scope_exit()
+    {
+      if (released) {
+        exit_func();
+      }
+    }
+
+    void release() { released = false; }
+
+  private:
+    explicit scope_exit(const scope_exit&) = delete;
+    scope_exit& operator=(const scope_exit&) = delete;
+    scope_exit& operator=(scope_exit&&) = delete;
+  };
+
+  template<typename T_ExitFunc>
+  [[nodiscard]] scope_exit<T_ExitFunc> make_scope_exit(
+    T_ExitFunc&& exitFunction)
+  {
+    return scope_exit<T_ExitFunc>(std::move(exitFunction));
+  }
+
+/*
+Make sure classes can access the private memmbers of tainted<T1> and
+tainted_volatile. Ideally, this should be
+
+template <typename U1>
+friend class tainted<U1, T_Sandbox>;
+
+But C++ doesn't seem to allow the above
+*/
+#define KEEP_CLASSES_FRIENDLY                                                  \
+  template<template<typename, typename> typename U1, typename U2, typename U3> \
+  friend class tainted_base_impl;                                              \
+                                                                               \
+  template<typename U1, typename U2>                                           \
+  friend class tainted;                                                        \
+                                                                               \
+  template<typename U1, typename U2>                                           \
+  friend class tainted_volatile;                                               \
+                                                                               \
+  template<typename U1>                                                        \
+  friend class rlbox_sandbox;                                                  \
+                                                                               \
+  template<typename U1, typename U2>                                           \
+  friend class sandbox_callback;                                               \
+                                                                               \
+  template<typename U1, typename U2>                                           \
+  friend class app_pointer;
+}
+
+}
diff --git a/third_party/rlbox/include/rlbox_noop_sandbox.hpp b/third_party/rlbox/include/rlbox_noop_sandbox.hpp
new file mode 100644
index 0000000000..d1e48edb4f
--- /dev/null
+++ b/third_party/rlbox/include/rlbox_noop_sandbox.hpp
@@ -0,0 +1,254 @@
+#pragma once
+
+#include <cstdint>
+#include <cstdlib>
+#include <mutex>
+#ifndef RLBOX_USE_CUSTOM_SHARED_LOCK
+#  include <shared_mutex>
+#endif
+#include <utility>
+
+#include "rlbox_helpers.hpp"
+
+namespace rlbox {
+
+class rlbox_noop_sandbox;
+
+struct rlbox_noop_sandbox_thread_data
+{
+  rlbox_noop_sandbox* sandbox;
+  uint32_t last_callback_invoked;
+};
+
+#ifdef RLBOX_EMBEDDER_PROVIDES_TLS_STATIC_VARIABLES
+
+rlbox_noop_sandbox_thread_data* get_rlbox_noop_sandbox_thread_data();
+#  define RLBOX_NOOP_SANDBOX_STATIC_VARIABLES()                                \
+    thread_local rlbox::rlbox_noop_sandbox_thread_data                         \
+      rlbox_noop_sandbox_thread_info{ 0, 0 };                                  \
+    namespace rlbox {                                                          \
+      rlbox_noop_sandbox_thread_data* get_rlbox_noop_sandbox_thread_data()     \
+      {                                                                        \
+        return &rlbox_noop_sandbox_thread_info;                                \
+      }                                                                        \
+    }                                                                          \
+    static_assert(true, "Enforce semi-colon")
+
+#endif
+
+/**
+ * @brief Class that implements the null sandbox. This sandbox doesn't actually
+ * provide any isolation and only serves as a stepping stone towards migrating
+ * an application to use the RLBox API.
+ */
+class rlbox_noop_sandbox
+{
+public:
+  // Stick with the system defaults
+  using T_LongLongType = long long;
+  using T_LongType = long;
+  using T_IntType = int;
+  using T_PointerType = void*;
+  using T_ShortType = short;
+  // no-op sandbox can transfer buffers as there is no sandboxings
+  // Thus transfer is a noop
+  using can_grant_deny_access = void;
+
+private:
+  RLBOX_SHARED_LOCK(callback_mutex);
+  static inline const uint32_t MAX_CALLBACKS = 64;
+  void* callback_unique_keys[MAX_CALLBACKS]{ 0 };
+  void* callbacks[MAX_CALLBACKS]{ 0 };
+
+#ifndef RLBOX_EMBEDDER_PROVIDES_TLS_STATIC_VARIABLES
+  thread_local static inline rlbox_noop_sandbox_thread_data thread_data{ 0, 0 };
+#endif
+
+  template<uint32_t N, typename T_Ret, typename... T_Args>
+  static T_Ret callback_trampoline(T_Args... params)
+  {
+#ifdef RLBOX_EMBEDDER_PROVIDES_TLS_STATIC_VARIABLES
+    auto& thread_data = *get_rlbox_noop_sandbox_thread_data();
+#endif
+    thread_data.last_callback_invoked = N;
+    using T_Func = T_Ret (*)(T_Args...);
+    T_Func func;
+    {
+#ifndef RLBOX_SINGLE_THREADED_INVOCATIONS
+      RLBOX_ACQUIRE_SHARED_GUARD(lock, thread_data.sandbox->callback_mutex);
+#endif
+      func = reinterpret_cast<T_Func>(thread_data.sandbox->callbacks[N]);
+    }
+    // Callbacks are invoked through function pointers, cannot use std::forward
+    // as we don't have caller context for T_Args, which means they are all
+    // effectively passed by value
+    return func(params...);
+  }
+
+protected:
+  inline void impl_create_sandbox() {}
+
+  inline void impl_destroy_sandbox() {}
+
+  template<typename T>
+  inline void* impl_get_unsandboxed_pointer(T_PointerType p) const
+  {
+    return p;
+  }
+
+  template<typename T>
+  inline T_PointerType impl_get_sandboxed_pointer(const void* p) const
+  {
+    return const_cast<T_PointerType>(p);
+  }
+
+  template<typename T>
+  static inline void* impl_get_unsandboxed_pointer_no_ctx(
+    T_PointerType p,
+    const void* /* example_unsandboxed_ptr */,
+    rlbox_noop_sandbox* (* // Func ptr
+                         /* param: expensive_sandbox_finder */)(
+      const void* example_unsandboxed_ptr))
+  {
+    return p;
+  }
+
+  template<typename T>
+  static inline T_PointerType impl_get_sandboxed_pointer_no_ctx(
+    const void* p,
+    const void* /* example_unsandboxed_ptr */,
+    rlbox_noop_sandbox* (* // Func ptr
+                         /* param: expensive_sandbox_finder */)(
+      const void* example_unsandboxed_ptr))
+  {
+    return const_cast<T_PointerType>(p);
+  }
+
+  inline T_PointerType impl_malloc_in_sandbox(size_t size)
+  {
+    void* p = malloc(size);
+    return p;
+  }
+
+  inline void impl_free_in_sandbox(T_PointerType p) { free(p); }
+
+  static inline bool impl_is_in_same_sandbox(const void*, const void*)
+  {
+    return true;
+  }
+
+  inline bool impl_is_pointer_in_sandbox_memory(const void*) { return true; }
+  inline bool impl_is_pointer_in_app_memory(const void*) { return true; }
+
+  inline size_t impl_get_total_memory()
+  {
+    return std::numeric_limits<size_t>::max();
+  }
+
+  inline void* impl_get_memory_location()
+  {
+    // There isn't any sandbox memory for the noop_sandbox as we just redirect
+    // to the app. Also, this is mostly used for pointer swizzling or sandbox
+    // bounds checks which is also not present/not required. So we can just
+    // return null
+    return nullptr;
+  }
+
+  // adding a template so that we can use static_assert to fire only if this
+  // function is invoked
+  template<typename T = void>
+  void* impl_lookup_symbol(const char* /* func_name */)
+  {
+    // Will fire if this impl_lookup_symbol is ever called for the static
+    // sandbox
+    constexpr bool fail = std::is_same_v<T, void>;
+    rlbox_detail_static_fail_because(
+      fail,
+      "The no_op_sandbox uses static calls and thus developers should add\n\n"
+      "#define RLBOX_USE_STATIC_CALLS() rlbox_noop_sandbox_lookup_symbol\n\n"
+      "to their code, to ensure that static calls are handled correctly.");
+
+    return nullptr;
+  }
+
+#define rlbox_noop_sandbox_lookup_symbol(func_name)                            \
+  reinterpret_cast<void*>(&func_name) /* NOLINT */
+
+  template<typename T, typename T_Converted, typename... T_Args>
+  auto impl_invoke_with_func_ptr(T_Converted* func_ptr, T_Args&&... params)
+  {
+#ifdef RLBOX_EMBEDDER_PROVIDES_TLS_STATIC_VARIABLES
+    auto& thread_data = *get_rlbox_noop_sandbox_thread_data();
+#endif
+    auto old_sandbox = thread_data.sandbox;
+    thread_data.sandbox = this;
+    auto on_exit = detail::make_scope_exit([&] {
+      thread_data.sandbox = old_sandbox;
+    });
+    return (*func_ptr)(params...);
+  }
+
+  template<typename T_Ret, typename... T_Args>
+  inline T_PointerType impl_register_callback(void* key, void* callback)
+  {
+    RLBOX_ACQUIRE_UNIQUE_GUARD(lock, callback_mutex);
+
+    void* chosen_trampoline = nullptr;
+
+    // need a compile time for loop as we we need I to be a compile time value
+    // this is because we are returning the I'th callback trampoline
+    detail::compile_time_for<MAX_CALLBACKS>([&](auto I) {
+      if (!chosen_trampoline && callback_unique_keys[I.value] == nullptr) {
+        callback_unique_keys[I.value] = key;
+        callbacks[I.value] = callback;
+        chosen_trampoline = reinterpret_cast<void*>(
+          callback_trampoline<I.value, T_Ret, T_Args...>);
+      }
+    });
+
+    return reinterpret_cast<T_PointerType>(chosen_trampoline);
+  }
+
+  static inline std::pair<rlbox_noop_sandbox*, void*>
+  impl_get_executed_callback_sandbox_and_key()
+  {
+#ifdef RLBOX_EMBEDDER_PROVIDES_TLS_STATIC_VARIABLES
+    auto& thread_data = *get_rlbox_noop_sandbox_thread_data();
+#endif
+    auto sandbox = thread_data.sandbox;
+    auto callback_num = thread_data.last_callback_invoked;
+    void* key = sandbox->callback_unique_keys[callback_num];
+    return std::make_pair(sandbox, key);
+  }
+
+  template<typename T_Ret, typename... T_Args>
+  inline void impl_unregister_callback(void* key)
+  {
+    RLBOX_ACQUIRE_UNIQUE_GUARD(lock, callback_mutex);
+    for (uint32_t i = 0; i < MAX_CALLBACKS; i++) {
+      if (callback_unique_keys[i] == key) {
+        callback_unique_keys[i] = nullptr;
+        callbacks[i] = nullptr;
+        break;
+      }
+    }
+  }
+
+  template<typename T>
+  inline T* impl_grant_access(T* src, size_t num, bool& success)
+  {
+    RLBOX_UNUSED(num);
+    success = true;
+    return src;
+  }
+
+  template<typename T>
+  inline T* impl_deny_access(T* src, size_t num, bool& success)
+  {
+    RLBOX_UNUSED(num);
+    success = true;
+    return src;
+  }
+};
+
+}
diff --git a/third_party/rlbox/include/rlbox_policy_types.hpp b/third_party/rlbox/include/rlbox_policy_types.hpp
new file mode 100644
index 0000000000..b5530dedcc
--- /dev/null
+++ b/third_party/rlbox/include/rlbox_policy_types.hpp
@@ -0,0 +1,387 @@
+#pragma once
+// IWYU pragma: private, include "rlbox.hpp"
+// IWYU pragma: friend "rlbox_.*\.hpp"
+
+#include <type_traits>
+#include <utility>
+
+#include "rlbox_helpers.hpp"
+#include "rlbox_struct_support.hpp"
+#include "rlbox_types.hpp"
+
+namespace rlbox {
+
+namespace callback_detail {
+
+  // Compute the expected type of the callback
+  template<typename T_Sbx, typename T_Ret, typename... T_Args>
+  using T_Cb =
+    std::conditional_t<std::is_void_v<T_Ret>, void, tainted<T_Ret, T_Sbx>> (*)(
+      rlbox_sandbox<T_Sbx>&,
+      tainted<T_Args, T_Sbx>...);
+
+  template<typename T_Sbx, typename T_Ret, typename... T_Args>
+  T_Cb<T_Sbx, T_Ret, T_Args...> callback_type_helper(T_Ret (*)(T_Args...));
+
+  // Compute the expected type of the interceptor
+  template<typename T_Sbx, typename T_Ret, typename... T_Args>
+  using T_I = detail::convert_to_sandbox_equivalent_t<T_Ret, T_Sbx> (*)(
+    detail::convert_to_sandbox_equivalent_t<T_Args, T_Sbx>...);
+
+  template<typename T_Sbx, typename T_Ret, typename... T_Args>
+  T_I<T_Sbx, T_Ret, T_Args...> interceptor_type_helper(T_Ret (*)(T_Args...));
+}
+
+template<typename T, typename T_Sbx>
+class sandbox_callback
+{
+  KEEP_CLASSES_FRIENDLY
+
+private:
+  rlbox_sandbox<T_Sbx>* sandbox;
+
+  using T_Callback =
+    decltype(callback_detail::callback_type_helper<T_Sbx>(std::declval<T>()));
+  T_Callback callback;
+
+  // The interceptor is the function that runs between the sandbox invoking the
+  // callback and the actual callback running The interceptor is responsible for
+  // wrapping and converting callback arguments, returns etc. to their
+  // appropriate representations
+  using T_Interceptor =
+    decltype(callback_detail::interceptor_type_helper<T_Sbx>(
+      std::declval<T>()));
+  T_Interceptor callback_interceptor;
+
+  // The trampoline is the internal sandbox representation of the callback
+  // Depending on the sandbox type, this could be the callback pointer directly
+  // or a trampoline function that gates exits from the sandbox.
+  using T_Trampoline = detail::convert_to_sandbox_equivalent_t<T, T_Sbx>;
+  T_Trampoline callback_trampoline;
+
+  // The unique key representing the callback to pass to unregister_callback on
+  // destruction
+  void* key;
+
+  inline void move_obj(sandbox_callback&& other)
+  {
+    sandbox = other.sandbox;
+    callback = other.callback;
+    callback_interceptor = other.callback_interceptor;
+    callback_trampoline = other.callback_trampoline;
+    key = other.key;
+    other.sandbox = nullptr;
+    other.callback = nullptr;
+    other.callback_interceptor = nullptr;
+    other.callback_trampoline = 0;
+    other.key = nullptr;
+  }
+
+  template<typename T_Ret, typename... T_Args>
+  inline void unregister_helper(T_Ret (*)(T_Args...))
+  {
+    if (callback != nullptr) {
+      // Don't need to worry about race between unregister and move as
+      // 1) this will not happen in a correctly written program
+      // 2) if this does happen, the worst that can happen is an invocation of a
+      // null function pointer, which causes a crash that cannot be exploited
+      // for RCE
+      sandbox->template unregister_callback<T_Ret, T_Args...>(key);
+      sandbox = nullptr;
+      callback = nullptr;
+      callback_interceptor = nullptr;
+      callback_trampoline = 0;
+      key = nullptr;
+    }
+  }
+
+  inline T_Callback get_raw_value() const noexcept { return callback; }
+  inline T_Trampoline get_raw_sandbox_value() const noexcept
+  {
+    return callback_trampoline;
+  }
+
+  // Keep constructor private as only rlbox_sandbox should be able to create
+  // this object
+  sandbox_callback(rlbox_sandbox<T_Sbx>* p_sandbox,
+                   T_Callback p_callback,
+                   T_Interceptor p_callback_interceptor,
+                   T_Trampoline p_callback_trampoline,
+                   void* p_key)
+    : sandbox(p_sandbox)
+    , callback(p_callback)
+    , callback_interceptor(p_callback_interceptor)
+    , callback_trampoline(p_callback_trampoline)
+    , key(p_key)
+  {
+    detail::dynamic_check(sandbox != nullptr,
+                          "Unexpected null sandbox when creating a callback");
+  }
+
+public:
+  sandbox_callback()
+    : sandbox(nullptr)
+    , callback(nullptr)
+    , callback_interceptor(nullptr)
+    , callback_trampoline(0)
+    , key(nullptr)
+  {}
+
+  sandbox_callback(sandbox_callback&& other)
+  {
+    move_obj(std::forward<sandbox_callback>(other));
+  }
+
+  inline sandbox_callback& operator=(sandbox_callback&& other)
+  {
+    if (this != &other) {
+      move_obj(std::forward<sandbox_callback>(other));
+    }
+    return *this;
+  }
+
+  void unregister()
+  {
+    T dummy = nullptr;
+    unregister_helper(dummy);
+  }
+
+  ~sandbox_callback() { unregister(); }
+
+  /**
+   * @brief Check if callback is _not_ registered.
+   */
+  inline bool is_unregistered() const noexcept
+  {
+    return get_raw_value() == nullptr;
+  }
+
+  /**
+   * @brief Unwrap a callback without verification. This is an unsafe operation
+   * and should be used with care.
+   */
+  inline auto UNSAFE_unverified() const noexcept { return get_raw_value(); }
+  /**
+   * @brief Like UNSAFE_unverified, but get the underlying sandbox
+   * representation.
+   *
+   * @param sandbox Reference to sandbox.
+   */
+  inline auto UNSAFE_sandboxed(rlbox_sandbox<T_Sbx>& sandbox) const noexcept
+  {
+    RLBOX_UNUSED(sandbox);
+    return get_raw_sandbox_value();
+  }
+};
+
+template<typename T, typename T_Sbx>
+class app_pointer
+{
+  KEEP_CLASSES_FRIENDLY
+
+private:
+  app_pointer_map<typename T_Sbx::T_PointerType>* map;
+  typename T_Sbx::T_PointerType idx;
+  T idx_unsandboxed;
+
+  inline void move_obj(app_pointer&& other)
+  {
+    map = other.map;
+    idx = other.idx;
+    idx_unsandboxed = other.idx_unsandboxed;
+    other.map = nullptr;
+    other.idx = 0;
+    other.idx_unsandboxed = nullptr;
+  }
+
+  inline T get_raw_value() const noexcept
+  {
+    return to_tainted().get_raw_value();
+  }
+  inline typename T_Sbx::T_PointerType get_raw_sandbox_value() const noexcept
+  {
+    return idx;
+  }
+
+  app_pointer(app_pointer_map<typename T_Sbx::T_PointerType>* a_map,
+              typename T_Sbx::T_PointerType a_idx,
+              T a_idx_unsandboxed)
+    : map(a_map)
+    , idx(a_idx)
+    , idx_unsandboxed(a_idx_unsandboxed)
+  {}
+
+public:
+  app_pointer()
+    : map(nullptr)
+    , idx(0)
+    , idx_unsandboxed(0)
+  {}
+
+  ~app_pointer() { unregister(); }
+
+  app_pointer(app_pointer&& other)
+  {
+    move_obj(std::forward<app_pointer>(other));
+  }
+
+  inline app_pointer& operator=(app_pointer&& other)
+  {
+    if (this != &other) {
+      move_obj(std::forward<app_pointer>(other));
+    }
+    return *this;
+  }
+
+  void unregister()
+  {
+    if (idx != 0) {
+      map->remove_app_ptr(idx);
+      map = nullptr;
+      idx = 0;
+      idx_unsandboxed = nullptr;
+    }
+  }
+
+  tainted<T, T_Sbx> to_tainted()
+  {
+    return tainted<T, T_Sbx>::internal_factory(
+      reinterpret_cast<T>(idx_unsandboxed));
+  }
+
+  /**
+   * @brief Check if app pointer is _not_ registered.
+   */
+  inline bool is_unregistered() const noexcept { return idx == 0; }
+
+  /**
+   * @brief Unwrap app_pointer without verification. This is an unsafe operation
+   * and should be used with care.
+   */
+  inline auto UNSAFE_unverified() const noexcept { return get_raw_value(); }
+  /**
+   * @brief Like UNSAFE_unverified, but get the underlying sandbox
+   * representation.
+   *
+   * @param sandbox Reference to sandbox.
+   */
+  inline auto UNSAFE_sandboxed(rlbox_sandbox<T_Sbx>& sandbox) const noexcept
+  {
+    RLBOX_UNUSED(sandbox);
+    return get_raw_sandbox_value();
+  }
+};
+
+/**
+ * @brief Tainted boolean value that serves as a "hint" and not a definite
+ * answer.  Comparisons with a tainted_volatile return such hints.  They are
+ * not `tainted<bool>` values because a compromised sandbox can modify
+ * tainted_volatile data at any time.
+ */
+class tainted_boolean_hint
+{
+private:
+  bool val;
+
+public:
+  tainted_boolean_hint(bool init)
+    : val(init)
+  {}
+  tainted_boolean_hint(const tainted_boolean_hint&) = default;
+  inline tainted_boolean_hint& operator=(bool rhs)
+  {
+    val = rhs;
+    return *this;
+  }
+  inline tainted_boolean_hint operator!() const { return tainted_boolean_hint(!val); }
+  template<size_t N>
+  inline bool unverified_safe_because(const char (&reason)[N]) const
+  {
+    (void)reason; /* unused */
+    return val;
+  }
+  inline bool UNSAFE_unverified() const { return val; }
+  inline auto INTERNAL_unverified_safe() const { return UNSAFE_unverified(); }
+
+  // Add a template parameter to make sure the assert only fires when called
+  template<typename T = void>
+  inline bool copy_and_verify(...) const
+  {
+    rlbox_detail_static_fail_because(
+      detail::true_v<T>,
+      "You can't call copy_and_verify on this value, as this is a result of a "
+      "comparison with memory accessible by the sandbox. \n"
+      "The sandbox could unexpectedly change the value leading to "
+      "time-of-check-time-of-use attacks. \n"
+      "You can avoid this by making a local copy of the data."
+      "For example, if your original code, looked like \n"
+      "if ((tainted_ptr->member == 5).copy_and_verify(...)) { ... } \n\n"
+      "Change this to \n\n"
+      "tainted<int> val = tainted_ptr->member\n"
+      "if ((val == 5).copy_and_verify(...)) { ... } \n\n"
+      "tainted<int, T_Sbx> foo(rlbox_sandbox<T_Sbx>& sandbox) {...} \n\n"
+      "Alternately, if you are sure your code is safe you can use the "
+      "unverified_safe_because API to remove tainting\n");
+
+    // this is never executed, but we need it for the function to type-check
+    return false;
+  }
+};
+
+/**
+ * @brief Tainted integer value that serves as a "hint" and not a definite
+ * answer.  Comparisons with a tainted_volatile return such hints.  They are
+ * not `tainted<int>` values because a compromised sandbox can modify
+ * tainted_volatile data at any time.
+ */
+class tainted_int_hint
+{
+private:
+  int val;
+
+public:
+  tainted_int_hint(int init)
+    : val(init)
+  {}
+  tainted_int_hint(const tainted_int_hint&) = default;
+  inline tainted_int_hint& operator=(int rhs)
+  {
+    val = rhs;
+    return *this;
+  }
+  inline tainted_boolean_hint operator!() const { return tainted_boolean_hint(!val); }
+  template<size_t N>
+  inline int unverified_safe_because(const char (&reason)[N]) const
+  {
+    (void)reason; /* unused */
+    return val;
+  }
+  inline int UNSAFE_unverified() const { return val; }
+  inline auto INTERNAL_unverified_safe() const { return UNSAFE_unverified(); }
+
+  // Add a template parameter to make sure the assert only fires when called
+  template<typename T = void>
+  inline int copy_and_verify(...) const
+  {
+    rlbox_detail_static_fail_because(
+      detail::true_v<T>,
+      "You can't call copy_and_verify on this value, as this is a result of a "
+      "comparison with memory accessible by the sandbox. \n"
+      "The sandbox could unexpectedly change the value leading to "
+      "time-of-check-time-of-use attacks. \n"
+      "You can avoid this by making a local copy of the data."
+      "For example, if your original code, looked like \n"
+      "if ((tainted_ptr->member == 5).copy_and_verify(...)) { ... } \n\n"
+      "Change this to \n\n"
+      "tainted<int> val = tainted_ptr->member\n"
+      "if ((val == 5).copy_and_verify(...)) { ... } \n\n"
+      "tainted<int, T_Sbx> foo(rlbox_sandbox<T_Sbx>& sandbox) {...} \n\n"
+      "Alternately, if you are sure your code is safe you can use the "
+      "unverified_safe_because API to remove tainting\n");
+
+    // this is never executed, but we need it for the function to type-check
+    return 0;
+  }
+};
+
+}
diff --git a/third_party/rlbox/include/rlbox_range.hpp b/third_party/rlbox/include/rlbox_range.hpp
new file mode 100644
index 0000000000..3dafcbd024
--- /dev/null
+++ b/third_party/rlbox/include/rlbox_range.hpp
@@ -0,0 +1,32 @@
+
+#pragma once
+// IWYU pragma: private, include "rlbox.hpp"
+// IWYU pragma: friend "rlbox_.*\.hpp"
+
+#include <cstdint>
+
+#include "rlbox_types.hpp"
+
+namespace rlbox::detail {
+
+// Checks that a given range is either entirely in a sandbox or entirely
+// outside
+template<typename T_Sbx>
+inline void check_range_doesnt_cross_app_sbx_boundary(const void* ptr,
+                                                      size_t size)
+{
+  auto ptr_start_val = reinterpret_cast<uintptr_t>(ptr);
+  detail::dynamic_check(
+    ptr_start_val,
+    "Performing memory operation memset/memcpy on a null pointer");
+  auto ptr_end_val = ptr_start_val + size - 1;
+
+  auto ptr_start = reinterpret_cast<void*>(ptr_start_val);
+  auto ptr_end = reinterpret_cast<void*>(ptr_end_val);
+
+  detail::dynamic_check(
+    rlbox_sandbox<T_Sbx>::is_in_same_sandbox(ptr_start, ptr_end),
+    "range has overflowed sandbox bounds");
+}
+
+}
\ No newline at end of file
diff --git a/third_party/rlbox/include/rlbox_sandbox.hpp b/third_party/rlbox/include/rlbox_sandbox.hpp
new file mode 100644
index 0000000000..b6cebeb3d0
--- /dev/null
+++ b/third_party/rlbox/include/rlbox_sandbox.hpp
@@ -0,0 +1,1094 @@
+#pragma once
+// IWYU pragma: private, include "rlbox.hpp"
+// IWYU pragma: friend "rlbox_.*\.hpp"
+
+#include <algorithm>
+#include <atomic>
+#ifdef RLBOX_MEASURE_TRANSITION_TIMES
+#  include <chrono>
+#endif
+#include <cstdlib>
+#include <limits>
+#include <map>
+#include <mutex>
+#ifndef RLBOX_USE_CUSTOM_SHARED_LOCK
+#  include <shared_mutex>
+#endif
+#ifdef RLBOX_MEASURE_TRANSITION_TIMES
+#  include <sstream>
+#  include <string>
+#endif
+#include <stdint.h>
+#include <type_traits>
+#include <utility>
+#include <vector>
+
+#include "rlbox_conversion.hpp"
+#include "rlbox_helpers.hpp"
+#include "rlbox_stdlib_polyfill.hpp"
+#include "rlbox_struct_support.hpp"
+#include "rlbox_type_traits.hpp"
+#include "rlbox_wrapper_traits.hpp"
+
+#ifdef RLBOX_MEASURE_TRANSITION_TIMES
+using namespace std::chrono;
+#endif
+
+namespace rlbox {
+
+namespace convert_fn_ptr_to_sandbox_equivalent_detail {
+  template<typename T, typename T_Sbx>
+  using conv = ::rlbox::detail::convert_to_sandbox_equivalent_t<T, T_Sbx>;
+
+  template<typename T_Ret, typename... T_Args>
+  using T_Func = T_Ret (*)(T_Args...);
+
+  template<typename T_Sbx, typename T_Ret, typename... T_Args>
+  T_Func<conv<T_Ret, T_Sbx>, conv<T_Args, T_Sbx>...> helper(
+    T_Ret (*)(T_Args...));
+}
+
+#if defined(RLBOX_MEASURE_TRANSITION_TIMES) ||                                 \
+  defined(RLBOX_TRANSITION_ACTION_OUT) || defined(RLBOX_TRANSITION_ACTION_IN)
+enum class rlbox_transition
+{
+  INVOKE,
+  CALLBACK
+};
+#endif
+#ifdef RLBOX_MEASURE_TRANSITION_TIMES
+struct rlbox_transition_timing
+{
+  rlbox_transition invoke;
+  const char* name;
+  void* ptr;
+  int64_t time;
+
+  std::string to_string()
+  {
+    std::ostringstream ret;
+    if (invoke == rlbox_transition::INVOKE) {
+      ret << name;
+    } else {
+      ret << "Callback " << ptr;
+    }
+    ret << " : " << time << "\n";
+
+    return ret.str();
+  }
+};
+#endif
+
+#ifndef RLBOX_SINGLE_THREADED_INVOCATIONS
+#  error                                                                       \
+    "RLBox does not yet support threading. Please define RLBOX_SINGLE_THREADED_INVOCATIONS prior to including RLBox and ensure you are only using it from a single thread. If threading is required, please file a bug."
+#endif
+
+/**
+ * @brief Encapsulation for sandboxes.
+ *
+ * @tparam T_Sbx Type of sandbox. For the null sandbox this is
+ * `rlbox_noop_sandbox`
+ */
+template<typename T_Sbx>
+class rlbox_sandbox : protected T_Sbx
+{
+  KEEP_CLASSES_FRIENDLY
+
+private:
+#ifdef RLBOX_MEASURE_TRANSITION_TIMES
+  std::vector<rlbox_transition_timing> transition_times;
+#endif
+
+  static inline RLBOX_SHARED_LOCK(sandbox_list_lock);
+  // The actual type of the vector is std::vector<rlbox_sandbox<T_Sbx>*>
+  // However clang 5, 6 have bugs where compilation seg-faults on this type
+  // So we just use this std::vector<void*>
+  static inline std::vector<void*> sandbox_list;
+
+  RLBOX_SHARED_LOCK(func_ptr_cache_lock);
+  std::map<std::string, void*> func_ptr_map;
+
+  app_pointer_map<typename T_Sbx::T_PointerType> app_ptr_map;
+
+  // This variable tracks of the sandbox has already been created/destroyed.
+  // APIs in this class should be called only when the sandbox is created.
+  // However, it is expensive to check in APIs such as invoke or in the callback
+  // interceptor. What's more, there could be time of check time of use issues
+  // in the checks as well.
+  // In general, we leave it up to the user to ensure these APIs are never
+  // called prior to sandbox construction or after destruction. We perform some
+  // conservative sanity checks, where they would not add too much overhead.
+  enum class Sandbox_Status
+  {
+    NOT_CREATED,
+    INITIALIZING,
+    CREATED,
+    CLEANING_UP
+  };
+  std::atomic<Sandbox_Status> sandbox_created = Sandbox_Status::NOT_CREATED;
+
+  std::mutex callback_lock;
+  std::vector<void*> callback_keys;
+
+  void* transition_state = nullptr;
+
+  template<typename T>
+  using convert_fn_ptr_to_sandbox_equivalent_t =
+    decltype(::rlbox::convert_fn_ptr_to_sandbox_equivalent_detail::helper<
+             T_Sbx>(std::declval<T>()));
+
+  template<typename T>
+  inline constexpr void check_invoke_param_type_is_ok()
+  {
+    using T_NoRef = std::remove_reference_t<T>;
+
+    if_constexpr_named(cond1, detail::rlbox_is_wrapper_v<T_NoRef>)
+    {
+      if_constexpr_named(
+        subcond1,
+        !std::is_same_v<T_Sbx, detail::rlbox_get_wrapper_sandbox_t<T_NoRef>>)
+      {
+        rlbox_detail_static_fail_because(
+          cond1 && subcond1,
+          "Mixing tainted data from a different sandbox types. This could "
+          "happen due to couple of different reasons.\n"
+          "1. You are using 2 sandbox types for example'rlbox_noop_sandbox' "
+          "and 'rlbox_lucet_sandbox', and are passing tainted data from one "
+          "sandbox as parameters into a function call to the other sandbox. "
+          "This is not allowed, unwrap the tainted data with copy_and_verify "
+          "or other unwrapping APIs first.\n"
+          "2. You have inadvertantly forgotten to set/remove "
+          "RLBOX_USE_STATIC_CALLS depending on the sandbox type. Some sandbox "
+          "types like rlbox_noop_sandbox require this to be set to a given "
+          "value, while other types like rlbox_lucet_sandbox, require this not "
+          "to be set.");
+      }
+    }
+    else if_constexpr_named(cond2,
+                            std::is_null_pointer_v<T_NoRef> ||
+                              detail::is_fundamental_or_enum_v<T_NoRef>)
+    {}
+    else
+    {
+      constexpr auto unknownCase = !(cond1 || cond2);
+      rlbox_detail_static_fail_because(
+        unknownCase,
+        "Arguments to a sandbox function call should be primitives or wrapped "
+        "types like tainted, callbacks etc.");
+    }
+  }
+
+  template<typename T>
+  inline auto invoke_process_param(T&& param)
+  {
+    check_invoke_param_type_is_ok<T>();
+
+    using T_NoRef = std::remove_reference_t<T>;
+
+    if constexpr (detail::rlbox_is_tainted_opaque_v<T_NoRef>) {
+      auto ret = from_opaque(param);
+      return ret.UNSAFE_sandboxed(*this);
+    } else if constexpr (detail::rlbox_is_wrapper_v<T_NoRef>) {
+      return param.UNSAFE_sandboxed(*this);
+    } else if constexpr (std::is_null_pointer_v<T_NoRef>) {
+      tainted<void*, T_Sbx> ret = nullptr;
+      return ret.UNSAFE_sandboxed(*this);
+    } else if constexpr (detail::is_fundamental_or_enum_v<T_NoRef>) {
+      // For unwrapped primitives, assign to a tainted var and then unwrap so
+      // that we adjust for machine model
+      tainted<T_NoRef, T_Sbx> ret = param;
+      return ret.UNSAFE_sandboxed(*this);
+    } else {
+      rlbox_detail_static_fail_because(
+        detail::true_v<T_NoRef>,
+        "Only tainted types, callbacks or primitive values such as ints can be "
+        "passed as parameters.\n"
+        "To make a parameter tainted, try moving the allocation into the "
+        "sandbox.\n"
+        "If the parameter is a callback, try registering the callback via the "
+        "register_callback API.");
+    }
+  }
+
+  template<typename T, typename T_Arg>
+  inline tainted<T, T_Sbx> sandbox_callback_intercept_convert_param(
+    rlbox_sandbox<T_Sbx>& sandbox,
+    const T_Arg& arg)
+  {
+    tainted<T, T_Sbx> ret;
+    using namespace detail;
+    convert_type<T_Sbx,
+                 adjust_type_direction::TO_APPLICATION,
+                 adjust_type_context::SANDBOX>(
+      ret.get_raw_value_ref(),
+      arg,
+      nullptr /* example_unsandboxed_ptr */,
+      &sandbox);
+    return ret;
+  }
+
+  template<typename T_Ret, typename... T_Args>
+  static detail::convert_to_sandbox_equivalent_t<T_Ret, T_Sbx>
+  sandbox_callback_interceptor(
+    detail::convert_to_sandbox_equivalent_t<T_Args, T_Sbx>... args)
+  {
+    std::pair<T_Sbx*, void*> context =
+      T_Sbx::impl_get_executed_callback_sandbox_and_key();
+    auto& sandbox = *(reinterpret_cast<rlbox_sandbox<T_Sbx>*>(context.first));
+    auto key = context.second;
+
+    using T_Func_Ret =
+      std::conditional_t<std::is_void_v<T_Ret>, void, tainted<T_Ret, T_Sbx>>;
+    using T_Func =
+      T_Func_Ret (*)(rlbox_sandbox<T_Sbx>&, tainted<T_Args, T_Sbx>...);
+    auto target_fn_ptr = reinterpret_cast<T_Func>(key);
+
+#ifdef RLBOX_MEASURE_TRANSITION_TIMES
+    high_resolution_clock::time_point enter_time = high_resolution_clock::now();
+    auto on_exit = rlbox::detail::make_scope_exit([&] {
+      auto exit_time = high_resolution_clock::now();
+      int64_t ns = duration_cast<nanoseconds>(exit_time - enter_time).count();
+      sandbox.transition_times.push_back(
+        rlbox_transition_timing{ rlbox_transition::CALLBACK,
+                                 nullptr /* func_name */,
+                                 key /* func_ptr */,
+                                 ns });
+    });
+#endif
+#ifdef RLBOX_TRANSITION_ACTION_OUT
+    RLBOX_TRANSITION_ACTION_OUT(rlbox_transition::CALLBACK,
+                                nullptr /* func_name */,
+                                key /* func_ptr */,
+                                sandbox.transition_state);
+#endif
+#ifdef RLBOX_TRANSITION_ACTION_IN
+    auto on_exit_transition = rlbox::detail::make_scope_exit([&] {
+      RLBOX_TRANSITION_ACTION_IN(rlbox_transition::CALLBACK,
+                                 nullptr /* func_name */,
+                                 key /* func_ptr */,
+                                 sandbox.transition_state);
+    });
+#endif
+    if constexpr (std::is_void_v<T_Func_Ret>) {
+      (*target_fn_ptr)(
+        sandbox,
+        sandbox.template sandbox_callback_intercept_convert_param<T_Args>(
+          sandbox, args)...);
+      return;
+    } else {
+      auto tainted_ret = (*target_fn_ptr)(
+        sandbox,
+        sandbox.template sandbox_callback_intercept_convert_param<T_Args>(
+          sandbox, args)...);
+
+      using namespace detail;
+      convert_to_sandbox_equivalent_t<T_Ret, T_Sbx> ret;
+      convert_type<T_Sbx,
+                   adjust_type_direction::TO_SANDBOX,
+                   adjust_type_context::SANDBOX>(
+        ret,
+        tainted_ret.get_raw_value_ref(),
+        nullptr /* example_unsandboxed_ptr */,
+        &sandbox);
+      return ret;
+    }
+  }
+
+  /**
+   * @brief Unregister a callback function and disallow the sandbox from
+   * calling this function henceforth.
+   */
+  template<typename T_Ret, typename... T_Args>
+  inline void unregister_callback(void* key)
+  {
+    // Silently swallowing the failure is better here as RAII types may try to
+    // cleanup callbacks after sandbox destruction
+    if (sandbox_created.load() != Sandbox_Status::CREATED) {
+      return;
+    }
+
+    this->template impl_unregister_callback<
+      detail::convert_to_sandbox_equivalent_t<T_Ret, T_Sbx>,
+      detail::convert_to_sandbox_equivalent_t<T_Args, T_Sbx>...>(key);
+
+    std::lock_guard<std::mutex> lock(callback_lock);
+    auto el_ref = std::find(callback_keys.begin(), callback_keys.end(), key);
+    detail::dynamic_check(
+      el_ref != callback_keys.end(),
+      "Unexpected state. Unregistering a callback that was never registered.");
+    callback_keys.erase(el_ref);
+  }
+
+  static T_Sbx* find_sandbox_from_example(const void* example_sandbox_ptr)
+  {
+    detail::dynamic_check(
+      example_sandbox_ptr != nullptr,
+      "Internal error: received a null example pointer. Please file a bug.");
+
+    RLBOX_ACQUIRE_SHARED_GUARD(lock, sandbox_list_lock);
+    for (auto sandbox_v : sandbox_list) {
+      auto sandbox = reinterpret_cast<rlbox_sandbox<T_Sbx>*>(sandbox_v);
+      if (sandbox->is_pointer_in_sandbox_memory(example_sandbox_ptr)) {
+        return sandbox;
+      }
+    }
+
+    return nullptr;
+  }
+
+  template<typename... T_Args>
+  static auto impl_create_sandbox_helper(rlbox_sandbox<T_Sbx>* this_ptr,
+                                         T_Args... args)
+  {
+    return this_ptr->impl_create_sandbox(std::forward<T_Args>(args)...);
+  }
+
+public:
+  /**
+   * @brief Unused member that allows the calling code to save data in a
+   * "per-sandbox" storage. This can be useful to save context which is used
+   * in callbacks.
+   */
+  void* sandbox_storage;
+
+  /***** Function to adjust for custom machine models *****/
+
+  template<typename T>
+  using convert_to_sandbox_equivalent_nonclass_t =
+    detail::convert_base_types_t<T,
+                                 typename T_Sbx::T_ShortType,
+                                 typename T_Sbx::T_IntType,
+                                 typename T_Sbx::T_LongType,
+                                 typename T_Sbx::T_LongLongType,
+                                 typename T_Sbx::T_PointerType>;
+
+  T_Sbx* get_sandbox_impl() { return this; }
+
+  /**
+   * @brief Create a new sandbox.
+   *
+   * @tparam T_Args Arguments passed to the underlying sandbox
+   * implementation. For the null sandbox, no arguments are necessary.
+   */
+  template<typename... T_Args>
+  inline bool create_sandbox(T_Args... args)
+  {
+#ifdef RLBOX_MEASURE_TRANSITION_TIMES
+    // Warm up the timer. The first call is always slow (at least on the test
+    // platform)
+    for (int i = 0; i < 10; i++) {
+      auto val = high_resolution_clock::now();
+      RLBOX_UNUSED(val);
+    }
+#endif
+    auto expected = Sandbox_Status::NOT_CREATED;
+    bool success = sandbox_created.compare_exchange_strong(
+      expected, Sandbox_Status::INITIALIZING /* desired */);
+    detail::dynamic_check(
+      success,
+      "create_sandbox called when sandbox already created/is being "
+      "created concurrently");
+
+    using T_Result = rlbox::detail::polyfill::invoke_result_t<
+      decltype(impl_create_sandbox_helper<T_Args...>),
+      decltype(this),
+      T_Args...>;
+
+    bool created = true;
+    if constexpr (std::is_same_v<T_Result, void>) {
+      this->impl_create_sandbox(std::forward<T_Args>(args)...);
+    } else if constexpr (std::is_same_v<T_Result, bool>) {
+      created = this->impl_create_sandbox(std::forward<T_Args>(args)...);
+    } else {
+      rlbox_detail_static_fail_because(
+        (!std::is_same_v<T_Result, void> && !std::is_same_v<T_Result, bool>),
+        "Expected impl_create_sandbox to return void or a boolean");
+    }
+
+    if (created) {
+      sandbox_created.store(Sandbox_Status::CREATED);
+      RLBOX_ACQUIRE_UNIQUE_GUARD(lock, sandbox_list_lock);
+      sandbox_list.push_back(this);
+    }
+
+    return created;
+  }
+
+  /**
+   * @brief Destroy sandbox and reclaim any memory.
+   */
+  inline auto destroy_sandbox()
+  {
+    auto expected = Sandbox_Status::CREATED;
+    bool success = sandbox_created.compare_exchange_strong(
+      expected, Sandbox_Status::CLEANING_UP /* desired */);
+
+    detail::dynamic_check(
+      success,
+      "destroy_sandbox called without sandbox creation/is being "
+      "destroyed concurrently");
+
+    {
+      RLBOX_ACQUIRE_UNIQUE_GUARD(lock, sandbox_list_lock);
+      auto el_ref = std::find(sandbox_list.begin(), sandbox_list.end(), this);
+      detail::dynamic_check(
+        el_ref != sandbox_list.end(),
+        "Unexpected state. Destroying a sandbox that was never initialized.");
+      sandbox_list.erase(el_ref);
+    }
+
+    sandbox_created.store(Sandbox_Status::NOT_CREATED);
+    return this->impl_destroy_sandbox();
+  }
+
+  template<typename T>
+  inline T get_unsandboxed_pointer(
+    convert_to_sandbox_equivalent_nonclass_t<T> p) const
+  {
+    static_assert(std::is_pointer_v<T>);
+    if (p == 0) {
+      return nullptr;
+    }
+    auto ret = this->template impl_get_unsandboxed_pointer<T>(p);
+    return reinterpret_cast<T>(ret);
+  }
+
+  template<typename T>
+  inline convert_to_sandbox_equivalent_nonclass_t<T> get_sandboxed_pointer(
+    const void* p) const
+  {
+    static_assert(std::is_pointer_v<T>);
+    if (p == nullptr) {
+      return 0;
+    }
+    return this->template impl_get_sandboxed_pointer<T>(p);
+  }
+
+  template<typename T>
+  static inline T get_unsandboxed_pointer_no_ctx(
+    convert_to_sandbox_equivalent_nonclass_t<T> p,
+    const void* example_unsandboxed_ptr)
+  {
+    static_assert(std::is_pointer_v<T>);
+    if (p == 0) {
+      return nullptr;
+    }
+    auto ret = T_Sbx::template impl_get_unsandboxed_pointer_no_ctx<T>(
+      p, example_unsandboxed_ptr, find_sandbox_from_example);
+    return reinterpret_cast<T>(ret);
+  }
+
+  template<typename T>
+  static inline convert_to_sandbox_equivalent_nonclass_t<T>
+  get_sandboxed_pointer_no_ctx(const void* p,
+                               const void* example_unsandboxed_ptr)
+  {
+    static_assert(std::is_pointer_v<T>);
+    if (p == nullptr) {
+      return 0;
+    }
+    return T_Sbx::template impl_get_sandboxed_pointer_no_ctx<T>(
+      p, example_unsandboxed_ptr, find_sandbox_from_example);
+  }
+
+  /**
+   * @brief Allocate a new pointer that is accessible to both the application
+   * and sandbox. The pointer is allocated in sandbox memory.
+   *
+   * @tparam T The type of the pointer you want to create. If T=int, this
+   * would return a pointer to an int.
+   *
+   * @return tainted<T*, T_Sbx> Tainted pointer accessible to the application
+   * and sandbox.
+   */
+  template<typename T>
+  inline tainted<T*, T_Sbx> malloc_in_sandbox()
+  {
+    const uint32_t defaultCount = 1;
+    return malloc_in_sandbox<T>(defaultCount);
+  }
+
+  /**
+   * @brief Allocate an array that is accessible to both the application
+   * and sandbox. The pointer is allocated in sandbox memory.
+   *
+   * @tparam T The type of the array elements you want to create. If T=int, this
+   * would return a pointer to an array of ints.
+   *
+   * @param count The number of array elements to allocate.
+   *
+   * @return tainted<T*, T_Sbx> Tainted pointer accessible to the application
+   * and sandbox.
+   */
+  template<typename T>
+  inline tainted<T*, T_Sbx> malloc_in_sandbox(uint32_t count)
+  {
+    // Silently swallowing the failure is better here as RAII types may try to
+    // malloc after sandbox destruction
+    if (sandbox_created.load() != Sandbox_Status::CREATED) {
+      return tainted<T*, T_Sbx>::internal_factory(nullptr);
+    }
+
+    detail::dynamic_check(count != 0, "Malloc tried to allocate 0 bytes");
+    if constexpr (sizeof(T) >= std::numeric_limits<uint32_t>::max()) {
+      rlbox_detail_static_fail_because(sizeof(T) >=
+                                         std::numeric_limits<uint32_t>::max(),
+                                       "Tried to allocate an object over 4GB.");
+    }
+    auto total_size = static_cast<uint64_t>(sizeof(T)) * count;
+    if constexpr (sizeof(size_t) == 4) {
+      // On a 32-bit platform, we need to make sure that total_size is not >=4GB
+      detail::dynamic_check(total_size < std::numeric_limits<uint32_t>::max(),
+                            "Tried to allocate memory over 4GB");
+    } else if constexpr (sizeof(size_t) != 8) {
+      // Double check we are on a 64-bit platform
+      // Note for static checks we need to have some dependence on T, so adding
+      // a dummy
+      constexpr bool dummy = sizeof(T) >= 0;
+      rlbox_detail_static_fail_because(dummy && sizeof(size_t) != 8,
+                                       "Expected 32 or 64 bit platform.");
+    }
+    auto ptr_in_sandbox = this->impl_malloc_in_sandbox(total_size);
+    auto ptr = get_unsandboxed_pointer<T*>(ptr_in_sandbox);
+    if (!ptr) {
+      return tainted<T*, T_Sbx>(nullptr);
+    }
+    detail::dynamic_check(is_pointer_in_sandbox_memory(ptr),
+                          "Malloc returned pointer outside the sandbox memory");
+    auto ptr_end = reinterpret_cast<uintptr_t>(ptr + (count - 1));
+    detail::dynamic_check(
+      is_in_same_sandbox(ptr, reinterpret_cast<void*>(ptr_end)),
+      "Malloc returned a pointer whose range goes beyond sandbox memory");
+    auto cast_ptr = reinterpret_cast<T*>(ptr);
+    return tainted<T*, T_Sbx>::internal_factory(cast_ptr);
+  }
+
+  /**
+   * @brief Free the memory referenced by the tainted pointer.
+   *
+   * @param ptr Pointer to sandbox memory to free.
+   */
+  template<typename T>
+  inline void free_in_sandbox(tainted<T*, T_Sbx> ptr)
+  {
+    // Silently swallowing the failure is better here as RAII types may try to
+    // free after sandbox destruction
+    if (sandbox_created.load() != Sandbox_Status::CREATED) {
+      return;
+    }
+
+    this->impl_free_in_sandbox(ptr.get_raw_sandbox_value(*this));
+  }
+
+  /**
+   * @brief Free the memory referenced by a tainted_volatile pointer ref.
+   *
+   * @param ptr_ref Pointer reference to sandbox memory to free.
+   */
+  template<typename T>
+  inline void free_in_sandbox(tainted_volatile<T, T_Sbx>& ptr_ref)
+  {
+    tainted<T, T_Sbx> ptr = ptr_ref;
+    free_in_sandbox(ptr);
+  }
+
+  /**
+   * @brief Free the memory referenced by a tainted_opaque pointer.
+   *
+   * @param ptr_opaque Opaque pointer to sandbox memory to free.
+   */
+  template<typename T>
+  inline void free_in_sandbox(tainted_opaque<T, T_Sbx> ptr_opaque)
+  {
+    tainted<T, T_Sbx> ptr = from_opaque(ptr_opaque);
+    free_in_sandbox(ptr);
+  }
+
+  /**
+   * @brief Check if two pointers are in the same sandbox.
+   * For the null-sandbox, this always returns true.
+   */
+  static inline bool is_in_same_sandbox(const void* p1, const void* p2)
+  {
+    const size_t num_args =
+      detail::func_arg_nums_v<decltype(T_Sbx::impl_is_in_same_sandbox)>;
+    if constexpr (num_args == 2) {
+      return T_Sbx::impl_is_in_same_sandbox(p1, p2);
+    } else {
+      return T_Sbx::impl_is_in_same_sandbox(p1, p2, find_sandbox_from_example);
+    }
+  }
+
+  /**
+   * @brief Check if the pointer points to this sandbox's memory.
+   * For the null-sandbox, this always returns true.
+   */
+  inline bool is_pointer_in_sandbox_memory(const void* p)
+  {
+    return this->impl_is_pointer_in_sandbox_memory(p);
+  }
+
+  /**
+   * @brief Check if the pointer points to application memory.
+   * For the null-sandbox, this always returns true.
+   */
+  inline bool is_pointer_in_app_memory(const void* p)
+  {
+    return this->impl_is_pointer_in_app_memory(p);
+  }
+
+  inline size_t get_total_memory() { return this->impl_get_total_memory(); }
+
+  inline void* get_memory_location()
+  {
+    return this->impl_get_memory_location();
+  }
+
+  void* get_transition_state() { return transition_state; }
+
+  void set_transition_state(void* new_state) { transition_state = new_state; }
+
+  /**
+   * @brief For internal use only.
+   * Grant access of the passed in buffer in to the sandbox instance. Called by
+   * internal APIs only if the underlying sandbox supports
+   * can_grant_deny_access by including the line
+   * ```
+   * using can_grant_deny_access = void;
+   * ```
+   */
+  template<typename T>
+  inline tainted<T*, T_Sbx> INTERNAL_grant_access(T* src,
+                                                  size_t num,
+                                                  bool& success)
+  {
+    auto ret = this->impl_grant_access(src, num, success);
+    return tainted<T*, T_Sbx>::internal_factory(ret);
+  }
+
+  /**
+   * @brief For internal use only.
+   * Grant access of the passed in buffer in to the sandbox instance. Called by
+   * internal APIs only if the underlying sandbox supports
+   * can_grant_deny_access by including the line
+   * ```
+   * using can_grant_deny_access = void;
+   * ```
+   */
+  template<typename T>
+  inline T* INTERNAL_deny_access(tainted<T*, T_Sbx> src,
+                                 size_t num,
+                                 bool& success)
+  {
+    auto ret =
+      this->impl_deny_access(src.INTERNAL_unverified_safe(), num, success);
+    return ret;
+  }
+
+  void* lookup_symbol(const char* func_name)
+  {
+    {
+      RLBOX_ACQUIRE_SHARED_GUARD(lock, func_ptr_cache_lock);
+
+      auto func_ptr_ref = func_ptr_map.find(func_name);
+      if (func_ptr_ref != func_ptr_map.end()) {
+        return func_ptr_ref->second;
+      }
+    }
+
+    void* func_ptr = this->impl_lookup_symbol(func_name);
+    RLBOX_ACQUIRE_UNIQUE_GUARD(lock, func_ptr_cache_lock);
+    func_ptr_map[func_name] = func_ptr;
+    return func_ptr;
+  }
+
+  void* internal_lookup_symbol(const char* func_name)
+  {
+    {
+      RLBOX_ACQUIRE_SHARED_GUARD(lock, func_ptr_cache_lock);
+
+      auto func_ptr_ref = func_ptr_map.find(func_name);
+      if (func_ptr_ref != func_ptr_map.end()) {
+        return func_ptr_ref->second;
+      }
+    }
+
+    void* func_ptr = 0;
+    if constexpr (rlbox::detail::
+                    has_member_using_needs_internal_lookup_symbol_v<T_Sbx>) {
+      func_ptr = this->impl_internal_lookup_symbol(func_name);
+    } else {
+      func_ptr = this->impl_lookup_symbol(func_name);
+    }
+    RLBOX_ACQUIRE_UNIQUE_GUARD(lock, func_ptr_cache_lock);
+    func_ptr_map[func_name] = func_ptr;
+    return func_ptr;
+  }
+
+  // this is an internal function invoked from macros, so it has be public
+  template<typename T, typename... T_Args>
+  inline auto INTERNAL_invoke_with_func_name(const char* func_name,
+                                             T_Args&&... params)
+  {
+    return INTERNAL_invoke_with_func_ptr<T, T_Args...>(
+      func_name, lookup_symbol(func_name), std::forward<T_Args>(params)...);
+  }
+
+  // this is an internal function invoked from macros, so it has be public
+  // Explicitly don't use inline on this, as this adds a lot of instructions
+  // prior to function call. What's more, by not inlining, different function
+  // calls with the same signature can share the same code segments for
+  // sandboxed function execution in the binary
+  template<typename T, typename... T_Args>
+  auto INTERNAL_invoke_with_func_ptr(const char* func_name,
+                                     void* func_ptr,
+                                     T_Args&&... params)
+  {
+    // unused in some paths
+    RLBOX_UNUSED(func_name);
+#ifdef RLBOX_MEASURE_TRANSITION_TIMES
+    auto enter_time = high_resolution_clock::now();
+    auto on_exit = rlbox::detail::make_scope_exit([&] {
+      auto exit_time = high_resolution_clock::now();
+      int64_t ns = duration_cast<nanoseconds>(exit_time - enter_time).count();
+      transition_times.push_back(rlbox_transition_timing{
+        rlbox_transition::INVOKE, func_name, func_ptr, ns });
+    });
+#endif
+#ifdef RLBOX_TRANSITION_ACTION_IN
+    RLBOX_TRANSITION_ACTION_IN(
+      rlbox_transition::INVOKE, func_name, func_ptr, transition_state);
+#endif
+#ifdef RLBOX_TRANSITION_ACTION_OUT
+    auto on_exit_transition = rlbox::detail::make_scope_exit([&] {
+      RLBOX_TRANSITION_ACTION_OUT(
+        rlbox_transition::INVOKE, func_name, func_ptr, transition_state);
+    });
+#endif
+    (check_invoke_param_type_is_ok<T_Args>(), ...);
+
+    static_assert(
+      rlbox::detail::polyfill::is_invocable_v<
+        T,
+        detail::rlbox_remove_wrapper_t<std::remove_reference_t<T_Args>>...>,
+      "Mismatched arguments types for function");
+
+    using T_Result = rlbox::detail::polyfill::invoke_result_t<
+      T,
+      detail::rlbox_remove_wrapper_t<std::remove_reference_t<T_Args>>...>;
+
+    using T_Converted =
+      std::remove_pointer_t<convert_fn_ptr_to_sandbox_equivalent_t<T*>>;
+
+    if constexpr (std::is_void_v<T_Result>) {
+      this->template impl_invoke_with_func_ptr<T>(
+        reinterpret_cast<T_Converted*>(func_ptr),
+        invoke_process_param(params)...);
+      return;
+    } else {
+      auto raw_result = this->template impl_invoke_with_func_ptr<T>(
+        reinterpret_cast<T_Converted*>(func_ptr),
+        invoke_process_param(params)...);
+      tainted<T_Result, T_Sbx> wrapped_result;
+      using namespace detail;
+      convert_type<T_Sbx,
+                   adjust_type_direction::TO_APPLICATION,
+                   adjust_type_context::SANDBOX>(
+        wrapped_result.get_raw_value_ref(),
+        raw_result,
+        nullptr /* example_unsandboxed_ptr */,
+        this /* sandbox_ptr */);
+      return wrapped_result;
+    }
+  }
+
+  // Useful in the porting stage to temporarily allow non tainted pointers to go
+  // through. This will only ever work in the rlbox_noop_sandbox. Any sandbox
+  // that actually enforces isolation will crash here.
+  template<typename T2>
+  tainted<T2, T_Sbx> UNSAFE_accept_pointer(T2 ptr)
+  {
+    static_assert(std::is_pointer_v<T2>,
+                  "UNSAFE_accept_pointer expects a pointer param");
+    tainted<T2, T_Sbx> ret;
+    ret.assign_raw_pointer(*this, ptr);
+    return ret;
+  }
+
+  template<typename T_Ret, typename... T_Args>
+  using T_Cb_no_wrap = detail::rlbox_remove_wrapper_t<T_Ret>(
+    detail::rlbox_remove_wrapper_t<T_Args>...);
+
+  template<typename T_Ret>
+  sandbox_callback<T_Cb_no_wrap<T_Ret>*, T_Sbx> register_callback(T_Ret (*)())
+  {
+    rlbox_detail_static_fail_because(
+      detail::true_v<T_Ret>,
+      "Modify the callback to change the first parameter to a sandbox. "
+      "For instance if a callback has type\n\n"
+      "int foo() {...}\n\n"
+      "Change this to \n\n"
+      "tainted<int, T_Sbx> foo(rlbox_sandbox<T_Sbx>& sandbox) {...}\n");
+
+    // this is never executed, but we need it for the function to type-check
+    std::abort();
+  }
+
+  /**
+   * @brief Expose a callback function to the sandboxed code.
+   *
+   * @param func_ptr The callback to expose.
+   *
+   * @tparam T_RL   Sandbox reference type (first argument).
+   * @tparam T_Ret  Return type of callback. Must be tainted or void.
+   * @tparam T_Args Types of remaining callback arguments. Must be tainted.
+   *
+   * @return Wrapped callback function pointer that can be passed to the
+   * sandbox.
+   */
+  template<typename T_RL, typename T_Ret, typename... T_Args>
+  sandbox_callback<T_Cb_no_wrap<T_Ret, T_Args...>*, T_Sbx> register_callback(
+    T_Ret (*func_ptr)(T_RL, T_Args...))
+  {
+    // Some branches don't use the param
+    RLBOX_UNUSED(func_ptr);
+
+    if_constexpr_named(cond1, !std::is_same_v<T_RL, rlbox_sandbox<T_Sbx>&>)
+    {
+      rlbox_detail_static_fail_because(
+        cond1,
+        "Modify the callback to change the first parameter to a sandbox. "
+        "For instance if a callback has type\n\n"
+        "int foo(int a, int b) {...}\n\n"
+        "Change this to \n\n"
+        "tainted<int, T_Sbx> foo(rlbox_sandbox<T_Sbx>& sandbox, "
+        "tainted<int, T_Sbx> a, tainted<int, T_Sbx> b) {...}\n");
+    }
+    else if_constexpr_named(
+      cond2, !(detail::rlbox_is_tainted_or_opaque_v<T_Args> && ...))
+    {
+      rlbox_detail_static_fail_because(
+        cond2,
+        "Change all arguments to the callback have to be tainted or "
+        "tainted_opaque. "
+        "For instance if a callback has type\n\n"
+        "int foo(int a, int b) {...}\n\n"
+        "Change this to \n\n"
+        "tainted<int, T_Sbx> foo(rlbox_sandbox<T_Sbx>& sandbox, "
+        "tainted<int, T_Sbx> a, tainted<int, T_Sbx> b) {...}\n");
+    }
+    else if_constexpr_named(
+      cond3, (std::is_array_v<detail::rlbox_remove_wrapper_t<T_Args>> || ...))
+    {
+      rlbox_detail_static_fail_because(
+        cond3,
+        "Change all static array arguments to the callback to be pointers. "
+        "For instance if a callback has type\n\n"
+        "int foo(int a[4]) {...}\n\n"
+        "Change this to \n\n"
+        "tainted<int, T_Sbx> foo(rlbox_sandbox<T_Sbx>& sandbox, "
+        "tainted<int*, T_Sbx> a) {...}\n");
+    }
+    else if_constexpr_named(
+      cond4,
+      !(std::is_void_v<T_Ret> || detail::rlbox_is_tainted_or_opaque_v<T_Ret>))
+    {
+      rlbox_detail_static_fail_because(
+        cond4,
+        "Change the callback return type to be tainted or tainted_opaque if it "
+        "is not void. "
+        "For instance if a callback has type\n\n"
+        "int foo(int a, int b) {...}\n\n"
+        "Change this to \n\n"
+        "tainted<int, T_Sbx> foo(rlbox_sandbox<T_Sbx>& sandbox, "
+        "tainted<int, T_Sbx> a, tainted<int, T_Sbx> b) {...}\n");
+    }
+    else
+    {
+      detail::dynamic_check(
+        sandbox_created.load() == Sandbox_Status::CREATED,
+        "register_callback called without sandbox creation");
+
+      // Need unique key for each callback we register - just use the func addr
+      void* unique_key = reinterpret_cast<void*>(func_ptr);
+
+      // Make sure that the user hasn't previously registered this function...
+      // If they have, we would returning 2 owning types (sandbox_callback) to
+      // the same callback which would be bad
+      {
+        std::lock_guard<std::mutex> lock(callback_lock);
+        bool exists =
+          std::find(callback_keys.begin(), callback_keys.end(), unique_key) !=
+          callback_keys.end();
+        detail::dynamic_check(
+          !exists, "You have previously already registered this callback.");
+        callback_keys.push_back(unique_key);
+      }
+
+      auto callback_interceptor =
+        sandbox_callback_interceptor<detail::rlbox_remove_wrapper_t<T_Ret>,
+                                     detail::rlbox_remove_wrapper_t<T_Args>...>;
+
+      auto callback_trampoline = this->template impl_register_callback<
+        detail::convert_to_sandbox_equivalent_t<
+          detail::rlbox_remove_wrapper_t<T_Ret>,
+          T_Sbx>,
+        detail::convert_to_sandbox_equivalent_t<
+          detail::rlbox_remove_wrapper_t<T_Args>,
+          T_Sbx>...>(unique_key, reinterpret_cast<void*>(callback_interceptor));
+
+      auto tainted_func_ptr = reinterpret_cast<
+        detail::rlbox_tainted_opaque_to_tainted_t<T_Ret, T_Sbx> (*)(
+          T_RL, detail::rlbox_tainted_opaque_to_tainted_t<T_Args, T_Sbx>...)>(
+        reinterpret_cast<void*>(func_ptr));
+
+      auto ret = sandbox_callback<T_Cb_no_wrap<T_Ret, T_Args...>*, T_Sbx>(
+        this,
+        tainted_func_ptr,
+        callback_interceptor,
+        callback_trampoline,
+        unique_key);
+      return ret;
+    }
+  }
+
+  // this is an internal function invoked from macros, so it has be public
+  template<typename T>
+  inline tainted<T*, T_Sbx> INTERNAL_get_sandbox_function_name(
+    const char* func_name)
+  {
+    return INTERNAL_get_sandbox_function_ptr<T>(
+      internal_lookup_symbol(func_name));
+  }
+
+  // this is an internal function invoked from macros, so it has be public
+  template<typename T>
+  inline tainted<T*, T_Sbx> INTERNAL_get_sandbox_function_ptr(void* func_ptr)
+  {
+    return tainted<T*, T_Sbx>::internal_factory(reinterpret_cast<T*>(func_ptr));
+  }
+
+  /**
+   * @brief Create a "fake" pointer referring to a location in the application
+   * memory
+   *
+   * @param ptr The pointer to refer to
+   *
+   * @return The app_pointer object that refers to this location.
+   */
+  template<typename T>
+  app_pointer<T*, T_Sbx> get_app_pointer(T* ptr)
+  {
+    auto max_ptr = (typename T_Sbx::T_PointerType)(get_total_memory() - 1);
+    auto idx = app_ptr_map.get_app_pointer_idx((void*)ptr, max_ptr);
+    auto idx_as_ptr = this->template impl_get_unsandboxed_pointer<T>(idx);
+    // Right now we simply assume that any integer can be converted to a valid
+    // pointer in the sandbox This may not be true for some sandboxing mechanism
+    // plugins in the future In this case, we will have to come up with
+    // something more clever to construct indexes that look like valid pointers
+    // Add a check for now to make sure things work fine
+    detail::dynamic_check(is_pointer_in_sandbox_memory(idx_as_ptr),
+                          "App pointers are not currently supported for this "
+                          "rlbox sandbox plugin. Please file a bug.");
+    auto ret = app_pointer<T*, T_Sbx>(
+      &app_ptr_map, idx, reinterpret_cast<T*>(idx_as_ptr));
+    return ret;
+  }
+
+  /**
+   * @brief The mirror of get_app_pointer. Take a tainted pointer which is
+   * actually an app_pointer, and get the application location being pointed to
+   *
+   * @param tainted_ptr The tainted pointer that is actually an app_pointer
+   *
+   * @return The original location being referred to by the app_ptr
+   */
+  template<typename T>
+  T* lookup_app_ptr(tainted<T*, T_Sbx> tainted_ptr)
+  {
+    auto idx = tainted_ptr.get_raw_sandbox_value(*this);
+    void* ret = app_ptr_map.lookup_index(idx);
+    return reinterpret_cast<T*>(ret);
+  }
+
+#ifdef RLBOX_MEASURE_TRANSITION_TIMES
+  inline std::vector<rlbox_transition_timing>&
+  process_and_get_transition_times()
+  {
+    return transition_times;
+  }
+  inline int64_t get_total_ns_time_in_sandbox_and_transitions()
+  {
+    int64_t ret = 0;
+    for (auto& transition_time : transition_times) {
+      if (transition_time.invoke == rlbox_transition::INVOKE) {
+        ret += transition_time.time;
+      } else {
+        ret -= transition_time.time;
+      }
+    }
+    return ret;
+  }
+  inline void clear_transition_times() { transition_times.clear(); }
+#endif
+};
+
+#if defined(__clang__)
+#  pragma clang diagnostic push
+#  pragma clang diagnostic ignored "-Wgnu-zero-variadic-macro-arguments"
+#elif defined(__GNUC__) || defined(__GNUG__)
+// Can't turn off the variadic macro warning emitted from -pedantic so use a
+// hack to stop GCC emitting warnings for the reminder of this file
+#  pragma GCC system_header
+#elif defined(_MSC_VER)
+// Doesn't seem to emit the warning
+#else
+// Don't know the compiler... just let it go through
+#endif
+
+/**
+ * @def  invoke_sandbox_function
+ * @brief Call sandbox function.
+ *
+ * @param func_name The sandboxed library function to call.
+ * @param ... Arguments to function should be simple or tainted values.
+ * @return Tainted value or void.
+ */
+#ifdef RLBOX_USE_STATIC_CALLS
+
+#  define sandbox_lookup_symbol_helper(prefix, func_name) prefix(func_name)
+
+#  define invoke_sandbox_function(func_name, ...)                              \
+    template INTERNAL_invoke_with_func_ptr<decltype(func_name)>(               \
+      #func_name,                                                              \
+      sandbox_lookup_symbol_helper(RLBOX_USE_STATIC_CALLS(), func_name),       \
+      ##__VA_ARGS__)
+
+#  define get_sandbox_function_address(func_name)                              \
+    template INTERNAL_get_sandbox_function_ptr<decltype(func_name)>(           \
+      sandbox_lookup_symbol_helper(RLBOX_USE_STATIC_CALLS(), func_name))
+
+#else
+
+#  define invoke_sandbox_function(func_name, ...)                              \
+    template INTERNAL_invoke_with_func_name<decltype(func_name)>(              \
+      #func_name, ##__VA_ARGS__)
+
+#  define get_sandbox_function_address(func_name)                              \
+    template INTERNAL_get_sandbox_function_name<decltype(func_name)>(#func_name)
+
+#endif
+
+#define sandbox_invoke(sandbox, func_name, ...)                                \
+  (sandbox).invoke_sandbox_function(func_name, ##__VA_ARGS__)
+
+#define sandbox_function_address(sandbox, func_name)                           \
+  (sandbox).get_sandbox_function_address(func_name)
+
+#if defined(__clang__)
+#  pragma clang diagnostic pop
+#else
+#endif
+
+}
diff --git a/third_party/rlbox/include/rlbox_stdlib.hpp b/third_party/rlbox/include/rlbox_stdlib.hpp
new file mode 100644
index 0000000000..cc60428077
--- /dev/null
+++ b/third_party/rlbox/include/rlbox_stdlib.hpp
@@ -0,0 +1,329 @@
+#pragma once
+// IWYU pragma: private, include "rlbox.hpp"
+// IWYU pragma: friend "rlbox_.*\.hpp"
+
+#include <cstring>
+#include <type_traits>
+
+#include "rlbox_helpers.hpp"
+#include "rlbox_types.hpp"
+#include "rlbox_unwrap.hpp"
+#include "rlbox_wrapper_traits.hpp"
+
+namespace rlbox {
+#define KEEP_CAST_FRIENDLY                                                     \
+  template<typename T_C_Lhs,                                                   \
+           typename T_C_Rhs,                                                   \
+           typename T_C_Sbx,                                                   \
+           template<typename, typename>                                        \
+           typename T_C_Wrap>                                                  \
+  friend inline tainted<T_C_Lhs, T_C_Sbx> sandbox_reinterpret_cast(            \
+    const T_C_Wrap<T_C_Rhs, T_C_Sbx>& rhs) noexcept;                           \
+                                                                               \
+  template<typename T_C_Lhs,                                                   \
+           typename T_C_Rhs,                                                   \
+           typename T_C_Sbx,                                                   \
+           template<typename, typename>                                        \
+           typename T_C_Wrap>                                                  \
+  friend inline tainted<T_C_Lhs, T_C_Sbx> sandbox_const_cast(                  \
+    const T_C_Wrap<T_C_Rhs, T_C_Sbx>& rhs) noexcept;                           \
+                                                                               \
+  template<typename T_C_Lhs,                                                   \
+           typename T_C_Rhs,                                                   \
+           typename T_C_Sbx,                                                   \
+           template<typename, typename>                                        \
+           typename T_C_Wrap>                                                  \
+  friend inline tainted<T_C_Lhs, T_C_Sbx> sandbox_static_cast(                 \
+    const T_C_Wrap<T_C_Rhs, T_C_Sbx>& rhs) noexcept;
+
+/**
+ * @brief The equivalent of a reinterpret_cast but operates on sandboxed values.
+ */
+template<typename T_Lhs,
+         typename T_Rhs,
+         typename T_Sbx,
+         template<typename, typename>
+         typename T_Wrap>
+inline tainted<T_Lhs, T_Sbx> sandbox_reinterpret_cast(
+  const T_Wrap<T_Rhs, T_Sbx>& rhs) noexcept
+{
+  static_assert(detail::rlbox_is_wrapper_v<T_Wrap<T_Rhs, T_Sbx>> &&
+                  std::is_pointer_v<T_Lhs> && std::is_pointer_v<T_Rhs>,
+                "sandbox_reinterpret_cast on incompatible types");
+
+  tainted<T_Rhs, T_Sbx> taintedVal = rhs;
+  auto raw = reinterpret_cast<T_Lhs>(taintedVal.INTERNAL_unverified_safe());
+  auto ret = tainted<T_Lhs, T_Sbx>::internal_factory(raw);
+  return ret;
+}
+
+/**
+ * @brief The equivalent of a const_cast but operates on sandboxed values.
+ */
+template<typename T_Lhs,
+         typename T_Rhs,
+         typename T_Sbx,
+         template<typename, typename>
+         typename T_Wrap>
+inline tainted<T_Lhs, T_Sbx> sandbox_const_cast(
+  const T_Wrap<T_Rhs, T_Sbx>& rhs) noexcept
+{
+  static_assert(detail::rlbox_is_wrapper_v<T_Wrap<T_Rhs, T_Sbx>>,
+                "sandbox_const_cast on incompatible types");
+
+  tainted<T_Rhs, T_Sbx> taintedVal = rhs;
+  auto raw = const_cast<T_Lhs>(taintedVal.INTERNAL_unverified_safe());
+  auto ret = tainted<T_Lhs, T_Sbx>::internal_factory(raw);
+  return ret;
+}
+
+/**
+ * @brief The equivalent of a static_cast but operates on sandboxed values.
+ */
+template<typename T_Lhs,
+         typename T_Rhs,
+         typename T_Sbx,
+         template<typename, typename>
+         typename T_Wrap>
+inline tainted<T_Lhs, T_Sbx> sandbox_static_cast(
+  const T_Wrap<T_Rhs, T_Sbx>& rhs) noexcept
+{
+  static_assert(detail::rlbox_is_wrapper_v<T_Wrap<T_Rhs, T_Sbx>>,
+                "sandbox_static_cast on incompatible types");
+
+  tainted<T_Rhs, T_Sbx> taintedVal = rhs;
+  auto raw = static_cast<T_Lhs>(taintedVal.INTERNAL_unverified_safe());
+  auto ret = tainted<T_Lhs, T_Sbx>::internal_factory(raw);
+  return ret;
+}
+
+/**
+ * @brief Fill sandbox memory with a constant byte.
+ */
+template<typename T_Sbx,
+         typename T_Rhs,
+         typename T_Val,
+         typename T_Num,
+         template<typename, typename>
+         typename T_Wrap>
+inline T_Wrap<T_Rhs*, T_Sbx> memset(rlbox_sandbox<T_Sbx>& sandbox,
+                                    T_Wrap<T_Rhs*, T_Sbx> ptr,
+                                    T_Val value,
+                                    T_Num num)
+{
+
+  static_assert(detail::rlbox_is_tainted_or_vol_v<T_Wrap<T_Rhs, T_Sbx>>,
+                "memset called on non wrapped type");
+
+  static_assert(!std::is_const_v<T_Rhs>, "Destination is const");
+
+  auto num_val = detail::unwrap_value(num);
+  detail::dynamic_check(num_val <= sandbox.get_total_memory(),
+                        "Called memset for memory larger than the sandbox");
+
+  tainted<T_Rhs*, T_Sbx> ptr_tainted = ptr;
+  void* dest_start = ptr_tainted.INTERNAL_unverified_safe();
+  detail::check_range_doesnt_cross_app_sbx_boundary<T_Sbx>(dest_start, num_val);
+
+  std::memset(dest_start, detail::unwrap_value(value), num_val);
+  return ptr;
+}
+
+/**
+ * @brief Copy to sandbox memory area. Note that memcpy is meant to be called on
+ * byte arrays does not adjust data according to ABI differences. If the
+ * programmer does accidentally call memcpy on buffers that needs ABI
+ * adjustment, this may cause compatibility issues, but will not cause a
+ * security issue as the destination is always a tainted or tainted_volatile
+ * pointer
+ */
+template<typename T_Sbx,
+         typename T_Rhs,
+         typename T_Lhs,
+         typename T_Num,
+         template<typename, typename>
+         typename T_Wrap>
+inline T_Wrap<T_Rhs*, T_Sbx> memcpy(rlbox_sandbox<T_Sbx>& sandbox,
+                                    T_Wrap<T_Rhs*, T_Sbx> dest,
+                                    T_Lhs src,
+                                    T_Num num)
+{
+
+  static_assert(detail::rlbox_is_tainted_or_vol_v<T_Wrap<T_Rhs, T_Sbx>>,
+                "memcpy called on non wrapped type");
+
+  static_assert(!std::is_const_v<T_Rhs>, "Destination is const");
+
+  auto num_val = detail::unwrap_value(num);
+  detail::dynamic_check(num_val <= sandbox.get_total_memory(),
+                        "Called memcpy for memory larger than the sandbox");
+
+  tainted<T_Rhs*, T_Sbx> dest_tainted = dest;
+  void* dest_start = dest_tainted.INTERNAL_unverified_safe();
+  detail::check_range_doesnt_cross_app_sbx_boundary<T_Sbx>(dest_start, num_val);
+
+  // src also needs to be checked, as we don't want to allow a src rand to start
+  // inside the sandbox and end outside, and vice versa
+  // src may or may not be a wrapper, so use unwrap_value
+  const void* src_start = detail::unwrap_value(src);
+  detail::check_range_doesnt_cross_app_sbx_boundary<T_Sbx>(src_start, num_val);
+
+  std::memcpy(dest_start, src_start, num_val);
+
+  return dest;
+}
+
+/**
+ * @brief Compare data in sandbox memory area.
+ */
+template<typename T_Sbx, typename T_Rhs, typename T_Lhs, typename T_Num>
+inline tainted_int_hint memcmp(rlbox_sandbox<T_Sbx>& sandbox,
+                               T_Rhs&& dest,
+                               T_Lhs&& src,
+                               T_Num&& num)
+{
+  static_assert(
+    detail::rlbox_is_tainted_or_vol_v<detail::remove_cv_ref_t<T_Rhs>> ||
+      detail::rlbox_is_tainted_or_vol_v<detail::remove_cv_ref_t<T_Lhs>>,
+    "memcmp called on non wrapped type");
+
+  auto num_val = detail::unwrap_value(num);
+  detail::dynamic_check(num_val <= sandbox.get_total_memory(),
+                        "Called memcmp for memory larger than the sandbox");
+
+  void* dest_start = dest.INTERNAL_unverified_safe();
+  detail::check_range_doesnt_cross_app_sbx_boundary<T_Sbx>(dest_start, num_val);
+
+  // src also needs to be checked, as we don't want to allow a src rand to start
+  // inside the sandbox and end outside, and vice versa
+  // src may or may not be a wrapper, so use unwrap_value
+  const void* src_start = detail::unwrap_value(src);
+  detail::check_range_doesnt_cross_app_sbx_boundary<T_Sbx>(src_start, num_val);
+
+  int ret = std::memcmp(dest_start, src_start, num_val);
+  tainted_int_hint converted_ret(ret);
+  return converted_ret;
+}
+
+/**
+ * @brief This function either
+ * - copies the given buffer into the sandbox calling delete on the src
+ * OR
+ * - if the sandbox allows, adds the buffer to the existing sandbox memory
+ * @param sandbox Target sandbox
+ * @param src Raw pointer to the buffer
+ * @param num Number of T-sized elements in the buffer
+ * @param free_source_on_copy If the source buffer was copied, this variable
+ * controls whether copy_memory_or_grant_access should call delete on the src.
+ * This calls delete[] if num > 1.
+ * @param copied out parameter indicating if the source was copied or transfered
+ */
+template<typename T_Sbx, typename T>
+tainted<T*, T_Sbx> copy_memory_or_grant_access(rlbox_sandbox<T_Sbx>& sandbox,
+                                               T* src,
+                                               size_t num,
+                                               bool free_source_on_copy,
+                                               bool& copied)
+{
+  copied = false;
+
+  // This function is meant for byte buffers only - so char and char16
+  static_assert(sizeof(T) <= 2);
+
+  // overflow ok
+  size_t source_size = num * sizeof(T);
+
+  // sandbox can grant access if it includes the following line
+  // using can_grant_deny_access = void;
+  if constexpr (detail::has_member_using_can_grant_deny_access_v<T_Sbx>) {
+    detail::check_range_doesnt_cross_app_sbx_boundary<T_Sbx>(src, source_size);
+
+    bool success;
+    auto ret = sandbox.INTERNAL_grant_access(src, num, success);
+    if (success) {
+      return ret;
+    }
+  }
+
+  // Malloc in sandbox takes a uint32_t as the parameter, need a bounds check
+  detail::dynamic_check(num <= std::numeric_limits<uint32_t>::max(),
+                        "Granting access too large a region");
+  using T_nocv = std::remove_cv_t<T>;
+  tainted<T_nocv*, T_Sbx> copy =
+    sandbox.template malloc_in_sandbox<T_nocv>(static_cast<uint32_t>(num));
+  if (!copy) {
+    return nullptr;
+  }
+
+  rlbox::memcpy(sandbox, copy, src, source_size);
+  if (free_source_on_copy) {
+    free(const_cast<void*>(reinterpret_cast<const void*>(src)));
+  }
+
+  copied = true;
+  return sandbox_const_cast<T*>(copy);
+}
+
+/**
+ * @brief This function either
+ * - copies the given buffer out of the sandbox calling free_in_sandbox on the
+ * src
+ * OR
+ * - if the sandbox allows, moves the buffer out of existing sandbox memory
+ * @param sandbox Target sandbox
+ * @param src Raw pointer to the buffer
+ * @param num Number of T-sized elements in the buffer
+ * @param free_source_on_copy If the source buffer was copied, this variable
+ * controls whether copy_memory_or_deny_access should call delete on the src.
+ * This calls delete[] if num > 1.
+ * @param copied out parameter indicating if the source was copied or transfered
+ */
+template<typename T_Sbx,
+         typename T,
+         template<typename, typename>
+         typename T_Wrap>
+T* copy_memory_or_deny_access(rlbox_sandbox<T_Sbx>& sandbox,
+                              T_Wrap<T*, T_Sbx> src,
+                              size_t num,
+                              bool free_source_on_copy,
+                              bool& copied)
+{
+  copied = false;
+
+  // This function is meant for byte buffers only - so char and char16
+  static_assert(sizeof(T) <= 2);
+
+  // overflow ok
+  size_t source_size = num * sizeof(T);
+
+  // sandbox can grant access if it includes the following line
+  // using can_grant_deny_access = void;
+  if constexpr (detail::has_member_using_can_grant_deny_access_v<T_Sbx>) {
+    detail::check_range_doesnt_cross_app_sbx_boundary<T_Sbx>(
+      src.INTERNAL_unverified_safe(), source_size);
+
+    bool success;
+    auto ret = sandbox.INTERNAL_deny_access(src, num, success);
+    if (success) {
+      return ret;
+    }
+  }
+
+  auto copy = static_cast<T*>(malloc(source_size));
+  if (!copy) {
+    return nullptr;
+  }
+
+  tainted<T*, T_Sbx> src_tainted = src;
+  char* src_raw = src_tainted.copy_and_verify_buffer_address(
+    [](uintptr_t val) { return reinterpret_cast<char*>(val); }, num);
+  std::memcpy(copy, src_raw, source_size);
+  if (free_source_on_copy) {
+    sandbox.free_in_sandbox(src);
+  }
+
+  copied = true;
+  return copy;
+}
+
+}
diff --git a/third_party/rlbox/include/rlbox_stdlib_polyfill.hpp b/third_party/rlbox/include/rlbox_stdlib_polyfill.hpp
new file mode 100644
index 0000000000..cf9c0117d0
--- /dev/null
+++ b/third_party/rlbox/include/rlbox_stdlib_polyfill.hpp
@@ -0,0 +1,175 @@
+#pragma once
+
+// This file is a polyfill for parts of the C++ standard library available only
+// in newer compilers. Since these are only compile time requirements, we can
+// just include these as part of the rlbox library in case the target compiler
+// doesn't support these features. For instance clang-5 which rlbox supports
+// does not support std::invocable and related functionality in <type_traits>
+// and is polyfilled here.
+//
+// This code was borrowed from clang's standard library - libc++
+//
+// Link:
+// https://github.com/llvm-mirror/libcxx/blob/master/include/type_traits
+//
+// libc++ is dual licensed under the MIT license and the UIUC License (a
+// BSD-like license) and is therefore compatible with our code base
+
+// std::invocable and friends
+
+namespace rlbox::detail::polyfill {
+
+struct __nat
+{
+  __nat() = delete;
+  __nat(const __nat&) = delete;
+  __nat& operator=(const __nat&) = delete;
+  ~__nat() = delete;
+};
+
+template<bool _Val>
+using _BoolConstant = std::integral_constant<bool, _Val>;
+
+template<class _Tp, class _Up>
+using _IsNotSame = _BoolConstant<!std::is_same<_Tp, _Up>::value>;
+
+#define INVOKE_RETURN(...)                                                     \
+  noexcept(noexcept(__VA_ARGS__))->decltype(__VA_ARGS__) { return __VA_ARGS__; }
+
+template<class _Fp, class... _Args>
+inline auto helper__invoke(_Fp&& __f, _Args&&... __args)
+  INVOKE_RETURN(std::forward<_Fp>(__f)(std::forward<_Args>(__args)...))
+
+    template<class _Fp, class... _Args>
+    inline constexpr auto helper__invoke_constexpr(_Fp&& __f, _Args&&... __args)
+      INVOKE_RETURN(std::forward<_Fp>(__f)(std::forward<_Args>(__args)...))
+
+#undef INVOKE_RETURN
+
+  // __invokable
+  template<class _Ret, class _Fp, class... _Args>
+  struct __invokable_r
+{
+  template<class _XFp, class... _XArgs>
+  static auto __try_call(int)
+    -> decltype(helper__invoke(std::declval<_XFp>(),
+                               std::declval<_XArgs>()...));
+  template<class _XFp, class... _XArgs>
+  static __nat __try_call(...);
+
+  // FIXME: Check that _Ret, _Fp, and _Args... are all complete types, cv void,
+  // or incomplete array types as required by the standard.
+  using _Result = decltype(__try_call<_Fp, _Args...>(0));
+
+  using type = typename std::conditional<
+    _IsNotSame<_Result, __nat>::value,
+    typename std::conditional<std::is_void<_Ret>::value,
+                              std::true_type,
+                              std::is_convertible<_Result, _Ret>>::type,
+    std::false_type>::type;
+  static const bool value = type::value;
+};
+template<class _Fp, class... _Args>
+using __invokable = __invokable_r<void, _Fp, _Args...>;
+
+template<bool _IsInvokable,
+         bool _IsCVVoid,
+         class _Ret,
+         class _Fp,
+         class... _Args>
+struct __nothrow_invokable_r_imp
+{
+  static const bool value = false;
+};
+
+template<class _Ret, class _Fp, class... _Args>
+struct __nothrow_invokable_r_imp<true, false, _Ret, _Fp, _Args...>
+{
+  typedef __nothrow_invokable_r_imp _ThisT;
+
+  template<class _Tp>
+  static void __test_noexcept(_Tp) noexcept;
+
+  static const bool value = noexcept(_ThisT::__test_noexcept<_Ret>(
+    helper__invoke(std::declval<_Fp>(), std::declval<_Args>()...)));
+};
+
+template<class _Ret, class _Fp, class... _Args>
+struct __nothrow_invokable_r_imp<true, true, _Ret, _Fp, _Args...>
+{
+  static const bool value =
+    noexcept(helper__invoke(std::declval<_Fp>(), std::declval<_Args>()...));
+};
+
+template<class _Ret, class _Fp, class... _Args>
+using __nothrow_invokable_r =
+  __nothrow_invokable_r_imp<__invokable_r<_Ret, _Fp, _Args...>::value,
+                            std::is_void<_Ret>::value,
+                            _Ret,
+                            _Fp,
+                            _Args...>;
+
+template<class _Fp, class... _Args>
+using __nothrow_invokable =
+  __nothrow_invokable_r_imp<__invokable<_Fp, _Args...>::value,
+                            true,
+                            void,
+                            _Fp,
+                            _Args...>;
+
+template<class _Fp, class... _Args>
+struct helper__invoke_of
+  : public std::enable_if<__invokable<_Fp, _Args...>::value,
+                          typename __invokable_r<void, _Fp, _Args...>::_Result>
+{};
+
+// invoke_result
+
+template<class _Fn, class... _Args>
+struct invoke_result : helper__invoke_of<_Fn, _Args...>
+{};
+
+template<class _Fn, class... _Args>
+using invoke_result_t = typename invoke_result<_Fn, _Args...>::type;
+
+// is_invocable
+
+template<class _Fn, class... _Args>
+struct is_invocable
+  : std::integral_constant<bool, __invokable<_Fn, _Args...>::value>
+{};
+
+template<class _Ret, class _Fn, class... _Args>
+struct is_invocable_r
+  : std::integral_constant<bool, __invokable_r<_Ret, _Fn, _Args...>::value>
+{};
+
+template<class _Fn, class... _Args>
+inline constexpr bool is_invocable_v = is_invocable<_Fn, _Args...>::value;
+
+template<class _Ret, class _Fn, class... _Args>
+inline constexpr bool is_invocable_r_v =
+  is_invocable_r<_Ret, _Fn, _Args...>::value;
+
+// is_nothrow_invocable
+
+template<class _Fn, class... _Args>
+struct is_nothrow_invocable
+  : std::integral_constant<bool, __nothrow_invokable<_Fn, _Args...>::value>
+{};
+
+template<class _Ret, class _Fn, class... _Args>
+struct is_nothrow_invocable_r
+  : std::integral_constant<bool,
+                           __nothrow_invokable_r<_Ret, _Fn, _Args...>::value>
+{};
+
+template<class _Fn, class... _Args>
+inline constexpr bool is_nothrow_invocable_v =
+  is_nothrow_invocable<_Fn, _Args...>::value;
+
+template<class _Ret, class _Fn, class... _Args>
+inline constexpr bool is_nothrow_invocable_r_v =
+  is_nothrow_invocable_r<_Ret, _Fn, _Args...>::value;
+
+}
diff --git a/third_party/rlbox/include/rlbox_struct_support.hpp b/third_party/rlbox/include/rlbox_struct_support.hpp
new file mode 100644
index 0000000000..b29d92aa6e
--- /dev/null
+++ b/third_party/rlbox/include/rlbox_struct_support.hpp
@@ -0,0 +1,353 @@
+#pragma once
+// IWYU pragma: private, include "rlbox.hpp"
+// IWYU pragma: friend "rlbox_.*\.hpp"
+
+#include <cstring>
+#include <functional>
+#include <type_traits>
+
+#include "rlbox_conversion.hpp"
+#include "rlbox_helpers.hpp"
+#include "rlbox_types.hpp"
+#include "rlbox_wrapper_traits.hpp"
+
+namespace rlbox::detail {
+
+template<typename T, typename T_Sbx, typename T_Enable = void>
+struct convert_to_sandbox_equivalent_helper;
+
+template<typename T, typename T_Sbx>
+struct convert_to_sandbox_equivalent_helper<
+  T,
+  T_Sbx,
+  std::enable_if_t<!std::is_class_v<T>>>
+{
+  using type = typename rlbox_sandbox<
+    T_Sbx>::template convert_to_sandbox_equivalent_nonclass_t<T>;
+};
+
+template<typename T, typename T_Sbx>
+using convert_to_sandbox_equivalent_t =
+  typename convert_to_sandbox_equivalent_helper<T, T_Sbx>::type;
+
+// This is used by rlbox_load_structs_from_library to test the current namespace
+struct markerStruct
+{};
+}
+
+#define helper_create_converted_field(fieldType, fieldName, isFrozen)          \
+  typename detail::convert_to_sandbox_equivalent_t<fieldType, T_Sbx> fieldName;
+
+#define helper_no_op()
+
+#define sandbox_equivalent_specialization(T, libId)                            \
+  template<typename T_Sbx>                                                     \
+  struct Sbx_##libId##_##T                                                     \
+  {                                                                            \
+    sandbox_fields_reflection_##libId##_class_##T(                             \
+      helper_create_converted_field,                                           \
+      helper_no_op)                                                            \
+  };                                                                           \
+                                                                               \
+  /* add convert_to_sandbox_equivalent_t specialization for new struct */      \
+  namespace detail {                                                           \
+    template<typename T_Template, typename T_Sbx>                              \
+    struct convert_to_sandbox_equivalent_helper<                               \
+      T_Template,                                                              \
+      T_Sbx,                                                                   \
+      std::enable_if_t<std::is_same_v<T_Template, T>>>                         \
+    {                                                                          \
+      using type = Sbx_##libId##_##T<T_Sbx>;                                   \
+    };                                                                         \
+  }
+
+#define helper_create_tainted_field(                                           \
+  fieldType, fieldName, isFrozen, MaybeConst)                                  \
+  MaybeConst tainted<fieldType, T_Sbx> fieldName;
+
+#define helper_create_tainted_vol_field(                                       \
+  fieldType, fieldName, isFrozen, MaybeConst)                                  \
+  MaybeConst tainted_volatile<fieldType, T_Sbx> fieldName;
+
+#define helper_convert_type(fieldType, fieldName, isFrozen)                    \
+  ::rlbox::detail::convert_type<T_Sbx, Direction, Context>(                    \
+    lhs.fieldName, rhs.fieldName, example_unsandboxed_ptr, sandbox_ptr);
+
+#define helper_find_example_pointer_or_null(fieldType, fieldName, isFrozen)    \
+  {                                                                            \
+    const void* ret = fieldName.find_example_pointer_or_null();                \
+    if (ret != nullptr) {                                                      \
+      return ret;                                                              \
+    }                                                                          \
+  }
+
+#define tainted_data_specialization_helper(MaybeConst, T, libId)               \
+                                                                               \
+  template<typename T_Sbx>                                                     \
+  class tainted_volatile<MaybeConst T, T_Sbx>                                  \
+  {                                                                            \
+    KEEP_CLASSES_FRIENDLY                                                      \
+    KEEP_CAST_FRIENDLY                                                         \
+                                                                               \
+  private:                                                                     \
+    inline MaybeConst Sbx_##libId##_##T<T_Sbx>&                                \
+    get_sandbox_value_ref() noexcept                                           \
+    {                                                                          \
+      return *reinterpret_cast<MaybeConst Sbx_##libId##_##T<T_Sbx>*>(this);    \
+    }                                                                          \
+                                                                               \
+    inline const Sbx_##libId##_##T<T_Sbx>& get_sandbox_value_ref()             \
+      const noexcept                                                           \
+    {                                                                          \
+      return *reinterpret_cast<const Sbx_##libId##_##T<T_Sbx>*>(this);         \
+    }                                                                          \
+                                                                               \
+    inline T get_raw_value() const noexcept                                    \
+    {                                                                          \
+      T lhs;                                                                   \
+      const auto& rhs = get_sandbox_value_ref();                               \
+      constexpr auto Direction =                                               \
+        detail::adjust_type_direction::TO_APPLICATION;                         \
+      constexpr auto Context = detail::adjust_type_context::EXAMPLE;           \
+      /* This is a tainted_volatile, so its address is a valid example for use \
+       * as example_unsandboxed_ptr */                                         \
+      const void* example_unsandboxed_ptr = &rhs;                              \
+      rlbox_sandbox<T_Sbx>* sandbox_ptr = nullptr;                             \
+      sandbox_fields_reflection_##libId##_class_##T(helper_convert_type,       \
+                                                    helper_no_op)              \
+                                                                               \
+        return lhs;                                                            \
+    }                                                                          \
+                                                                               \
+    /* get_raw_sandbox_value has to return a custom struct to deal with the    \
+     * adjusted machine model, to ensure */                                    \
+    inline Sbx_##libId##_##T<T_Sbx> get_raw_sandbox_value() const noexcept     \
+    {                                                                          \
+      auto ret_ptr = reinterpret_cast<const Sbx_##libId##_##T<T_Sbx>*>(this);  \
+      return *ret_ptr;                                                         \
+    }                                                                          \
+                                                                               \
+    tainted_volatile() = default;                                              \
+    tainted_volatile(const tainted_volatile<MaybeConst T, T_Sbx>& p) =         \
+      default;                                                                 \
+                                                                               \
+  public:                                                                      \
+    sandbox_fields_reflection_##libId##_class_##T(                             \
+      helper_create_tainted_vol_field,                                         \
+      helper_no_op,                                                            \
+      MaybeConst)                                                              \
+                                                                               \
+    inline tainted<MaybeConst T*, T_Sbx> operator&() const noexcept            \
+    {                                                                          \
+      auto ref_cast =                                                          \
+        reinterpret_cast<MaybeConst T*>(&get_sandbox_value_ref());             \
+      auto ret = tainted<MaybeConst T*, T_Sbx>::internal_factory(ref_cast);    \
+      return ret;                                                              \
+    }                                                                          \
+                                                                               \
+    inline auto UNSAFE_unverified() const { return get_raw_value(); }          \
+    inline auto UNSAFE_sandboxed(rlbox_sandbox<T_Sbx>& sandbox) const          \
+    {                                                                          \
+      return get_raw_sandbox_value(sandbox);                                   \
+    }                                                                          \
+                                                                               \
+    template<size_t N>                                                         \
+    inline auto unverified_safe_because(const char (&reason)[N]) const         \
+    {                                                                          \
+      RLBOX_UNUSED(reason);                                                    \
+      return UNSAFE_unverified();                                              \
+    }                                                                          \
+                                                                               \
+    T copy_and_verify(std::function<T(tainted<T, T_Sbx>)> verifier)            \
+    {                                                                          \
+      tainted<T, T_Sbx> val(*this);                                            \
+      return verifier(val);                                                    \
+    }                                                                          \
+                                                                               \
+    /* Can't define this yet due, to mutually dependent definition between     \
+    tainted and tainted_volatile for structs */                                \
+    inline tainted_volatile<MaybeConst T, T_Sbx>& operator=(                   \
+      const tainted<T, T_Sbx>& rhs);                                           \
+  };                                                                           \
+                                                                               \
+  template<typename T_Sbx>                                                     \
+  class tainted<MaybeConst T, T_Sbx>                                           \
+  {                                                                            \
+    KEEP_CLASSES_FRIENDLY                                                      \
+    KEEP_CAST_FRIENDLY                                                         \
+                                                                               \
+  private:                                                                     \
+    inline MaybeConst T& get_raw_value_ref() noexcept                          \
+    {                                                                          \
+      return *reinterpret_cast<MaybeConst T*>(this);                           \
+    }                                                                          \
+                                                                               \
+    inline const T& get_raw_value_ref() const noexcept                         \
+    {                                                                          \
+      return *reinterpret_cast<const T*>(this);                                \
+    }                                                                          \
+                                                                               \
+    inline T get_raw_value() const noexcept                                    \
+    {                                                                          \
+      auto ret_ptr = reinterpret_cast<const T*>(this);                         \
+      return *ret_ptr;                                                         \
+    }                                                                          \
+                                                                               \
+    /* get_raw_sandbox_value has to return a custom struct to deal with the    \
+     * adjusted machine model, to ensure */                                    \
+    inline Sbx_##libId##_##T<T_Sbx> get_raw_sandbox_value(                     \
+      rlbox_sandbox<T_Sbx>& sandbox) const noexcept                            \
+    {                                                                          \
+      Sbx_##libId##_##T<T_Sbx> lhs;                                            \
+      const auto& rhs = get_raw_value_ref();                                   \
+      constexpr auto Direction = detail::adjust_type_direction::TO_SANDBOX;    \
+      constexpr auto Context = detail::adjust_type_context::SANDBOX;           \
+      const void* example_unsandboxed_ptr = nullptr;                           \
+      rlbox_sandbox<T_Sbx>* sandbox_ptr = &sandbox;                            \
+      sandbox_fields_reflection_##libId##_class_##T(helper_convert_type,       \
+                                                    helper_no_op)              \
+                                                                               \
+        return lhs;                                                            \
+    }                                                                          \
+                                                                               \
+    inline const void* find_example_pointer_or_null() const noexcept           \
+    {                                                                          \
+      sandbox_fields_reflection_##libId##_class_##T(                           \
+        helper_find_example_pointer_or_null, helper_no_op)                     \
+                                                                               \
+        return nullptr;                                                        \
+    }                                                                          \
+                                                                               \
+  public:                                                                      \
+    sandbox_fields_reflection_##libId##_class_##T(helper_create_tainted_field, \
+                                                  helper_no_op,                \
+                                                  MaybeConst)                  \
+                                                                               \
+    tainted() = default;                                                       \
+    tainted(const tainted<MaybeConst T, T_Sbx>& p) = default;                  \
+                                                                               \
+    tainted(const tainted_volatile<T, T_Sbx>& p)                               \
+    {                                                                          \
+      auto& lhs = get_raw_value_ref();                                         \
+      auto& rhs = p.get_sandbox_value_ref();                                   \
+      constexpr auto Direction =                                               \
+        detail::adjust_type_direction::TO_APPLICATION;                         \
+      constexpr auto Context = detail::adjust_type_context::EXAMPLE;           \
+      /* This is a tainted_volatile, so its address is a valid for use as */   \
+      /* example_unsandboxed_ptr */                                            \
+      const void* example_unsandboxed_ptr = &rhs;                              \
+      rlbox_sandbox<T_Sbx>* sandbox_ptr = nullptr;                             \
+      sandbox_fields_reflection_##libId##_class_##T(helper_convert_type,       \
+                                                    helper_no_op)              \
+    }                                                                          \
+                                                                               \
+    inline tainted_opaque<MaybeConst T, T_Sbx> to_opaque()                     \
+    {                                                                          \
+      return *reinterpret_cast<tainted_opaque<MaybeConst T, T_Sbx>*>(this);    \
+    }                                                                          \
+                                                                               \
+    inline auto UNSAFE_unverified() const { return get_raw_value(); }          \
+    inline auto UNSAFE_sandboxed(rlbox_sandbox<T_Sbx>& sandbox) const          \
+    {                                                                          \
+      return get_raw_sandbox_value(sandbox);                                   \
+    }                                                                          \
+                                                                               \
+    template<size_t N>                                                         \
+    inline auto unverified_safe_because(const char (&reason)[N]) const         \
+    {                                                                          \
+      RLBOX_UNUSED(reason);                                                    \
+      return UNSAFE_unverified();                                              \
+    }                                                                          \
+                                                                               \
+    T copy_and_verify(std::function<T(tainted<T, T_Sbx>)> verifier)            \
+    {                                                                          \
+      return verifier(*this);                                                  \
+    }                                                                          \
+  };                                                                           \
+                                                                               \
+  /* Had to delay the definition due, to mutually dependence between           \
+    tainted and tainted_volatile for structs */                                \
+  template<typename T_Sbx>                                                     \
+  inline tainted_volatile<MaybeConst T, T_Sbx>&                                \
+  tainted_volatile<MaybeConst T, T_Sbx>::operator=(                            \
+    const tainted<T, T_Sbx>& rhs_wrap)                                         \
+  {                                                                            \
+    auto& lhs = get_sandbox_value_ref();                                       \
+    auto& rhs = rhs_wrap.get_raw_value_ref();                                  \
+    constexpr auto Direction = detail::adjust_type_direction::TO_SANDBOX;      \
+    constexpr auto Context = detail::adjust_type_context::EXAMPLE;             \
+    /* This is a tainted_volatile, so its address is a valid example for */    \
+    /*  use as example_unsandboxed_ptr */                                      \
+    const void* example_unsandboxed_ptr = &lhs;                                \
+    rlbox_sandbox<T_Sbx>* sandbox_ptr = nullptr;                               \
+    sandbox_fields_reflection_##libId##_class_##T(helper_convert_type,         \
+                                                  helper_no_op)                \
+                                                                               \
+      return *this;                                                            \
+  }
+
+#define tainted_data_specialization(T, libId)                                  \
+  tainted_data_specialization_helper(     , T, libId)                          \
+  tainted_data_specialization_helper(const, T, libId)
+
+#define convert_type_specialization(T, libId)                                  \
+  namespace detail {                                                           \
+    template<typename T_Sbx,                                                   \
+             detail::adjust_type_direction Direction,                          \
+             adjust_type_context Context,                                      \
+             typename T_From>                                                  \
+    class convert_type_class<T_Sbx, Direction, Context, T, T_From>             \
+    {                                                                          \
+    public:                                                                    \
+      static inline void run(T& lhs,                                           \
+                             const T_From& rhs,                                \
+                             const void* example_unsandboxed_ptr,              \
+                             rlbox_sandbox<T_Sbx>* sandbox_ptr)                \
+      {                                                                        \
+        sandbox_fields_reflection_##libId##_class_##T(helper_convert_type,     \
+                                                      helper_no_op)            \
+      }                                                                        \
+    };                                                                         \
+                                                                               \
+    template<typename T_Sbx,                                                   \
+             detail::adjust_type_direction Direction,                          \
+             adjust_type_context Context,                                      \
+             typename T_From>                                                  \
+    class convert_type_class<T_Sbx,                                            \
+                             Direction,                                        \
+                             Context,                                          \
+                             Sbx_##libId##_##T<T_Sbx>,                         \
+                             T_From>                                           \
+    {                                                                          \
+    public:                                                                    \
+      static inline void run(Sbx_##libId##_##T<T_Sbx>& lhs,                    \
+                             const T_From& rhs,                                \
+                             const void* example_unsandboxed_ptr,              \
+                             rlbox_sandbox<T_Sbx>* sandbox_ptr)                \
+      {                                                                        \
+        sandbox_fields_reflection_##libId##_class_##T(helper_convert_type,     \
+                                                      helper_no_op)            \
+      }                                                                        \
+    };                                                                         \
+  }
+
+// clang-format off
+#define rlbox_load_structs_from_library(libId)                                 \
+  namespace rlbox {                                                            \
+    /* check that this macro is called in a global namespace */                \
+    static_assert(                                                             \
+      ::rlbox::detail::is_member_of_rlbox_detail<detail::markerStruct>,        \
+      "Invoke rlbox_load_structs_from_library in the global namespace");       \
+                                                                               \
+    sandbox_fields_reflection_##libId##_allClasses(                            \
+      sandbox_equivalent_specialization)                                       \
+                                                                               \
+    sandbox_fields_reflection_##libId##_allClasses(                            \
+      tainted_data_specialization)                                             \
+                                                                               \
+    sandbox_fields_reflection_##libId##_allClasses(                            \
+      convert_type_specialization)                                             \
+  }                                                                            \
+  RLBOX_REQUIRE_SEMI_COLON
+
+// clang-format on
\ No newline at end of file
diff --git a/third_party/rlbox/include/rlbox_type_traits.hpp b/third_party/rlbox/include/rlbox_type_traits.hpp
new file mode 100644
index 0000000000..b32e677c32
--- /dev/null
+++ b/third_party/rlbox/include/rlbox_type_traits.hpp
@@ -0,0 +1,546 @@
+#pragma once
+// IWYU pragma: private, include "rlbox.hpp"
+// IWYU pragma: friend "rlbox_.*\.hpp"
+
+#include <array>
+#include <type_traits>
+
+namespace rlbox::detail {
+
+#define RLBOX_ENABLE_IF(...) std::enable_if_t<__VA_ARGS__>* = nullptr
+
+template<typename T>
+constexpr bool true_v = true;
+
+template<typename T>
+constexpr bool is_fundamental_or_enum_v =
+  std::is_fundamental_v<T> || std::is_enum_v<T>;
+
+template<typename T>
+constexpr bool is_basic_type_v =
+  std::is_fundamental_v<T> || std::is_enum_v<T> || std::is_pointer_v<T>;
+
+template<typename T>
+using valid_return_t =
+  std::conditional_t<std::is_function_v<T>, void*, std::decay_t<T>>;
+
+template<typename T>
+using valid_param_t = std::conditional_t<std::is_void_v<T>, void*, T>;
+
+namespace func_first_arg_detail {
+  template<typename Ret, typename Arg, typename... Rest>
+  Arg func_first_arg_t_helper(Ret (*)(Arg, Rest...));
+
+  template<typename Ret, typename F, typename Arg, typename... Rest>
+  Arg func_first_arg_t_helper(Ret (F::*)(Arg, Rest...));
+
+  template<typename Ret, typename F, typename Arg, typename... Rest>
+  Arg func_first_arg_t_helper(Ret (F::*)(Arg, Rest...) const);
+
+  template<typename F>
+  decltype(func_first_arg_t_helper(&F::operator())) first_argument_helper(F);
+}
+
+template<typename T>
+using func_first_arg_t =
+  decltype(func_first_arg_detail::first_argument_helper(std::declval<T>()));
+
+namespace func_arg_nums_v_detail {
+  template<typename T_Ret, typename... T_Args>
+  constexpr size_t helper_two(T_Ret (*)(T_Args...))
+  {
+    return sizeof...(T_Args);
+  }
+  template<typename T_Func>
+  constexpr size_t helper()
+  {
+    constexpr T_Func* ptr = nullptr;
+    return helper_two(ptr);
+  }
+}
+
+template<typename T_Func>
+constexpr size_t func_arg_nums_v = func_arg_nums_v_detail::helper<T_Func>();
+
+template<typename T>
+using valid_array_el_t =
+  std::conditional_t<std::is_void_v<T> || std::is_function_v<T>, int, T>;
+
+template<typename T>
+constexpr bool is_func_ptr_v = (std::is_pointer_v<T> &&
+                                std::is_function_v<std::remove_pointer_t<T>>) ||
+                               std::is_member_function_pointer_v<T>;
+
+template<typename T>
+constexpr bool is_func_or_func_ptr = std::is_function_v<T> || is_func_ptr_v<T>;
+
+template<typename T>
+constexpr bool is_one_level_ptr_v =
+  std::is_pointer_v<T> && !std::is_pointer_v<std::remove_pointer_t<T>>;
+
+template<typename T_This, typename T_Target>
+using add_const_if_this_const_t =
+  std::conditional_t<std::is_const_v<std::remove_pointer_t<T_This>>,
+                     std::add_const_t<T_Target>,
+                     T_Target>;
+
+template<typename T>
+using remove_const_from_pointer = std::conditional_t<
+  std::is_pointer_v<T>,
+  std::add_pointer_t<std::remove_const_t<std::remove_pointer_t<T>>>,
+  T>;
+
+template<typename T>
+using add_const_from_pointer = std::conditional_t<
+  std::is_pointer_v<T>,
+  std::remove_pointer_t<std::add_const_t<std::remove_pointer_t<T>>>,
+  T>;
+
+template<typename T>
+using remove_cv_ref_t = std::remove_cv_t<std::remove_reference_t<T>>;
+
+template<typename T>
+using c_to_std_array_t =
+  std::conditional_t<std::is_array_v<T>,
+                     std::array<std::remove_extent_t<T>, std::extent_v<T>>,
+                     T>;
+
+namespace std_array_to_c_arr_detail {
+  template<typename T>
+  struct W
+  {
+    using type = T;
+  };
+
+  template<typename T, size_t N>
+  W<T[N]> std_array_to_c_arr_helper(std::array<T, N>);
+
+  template<typename T>
+  W<T> std_array_to_c_arr_helper(T&&);
+}
+
+template<typename T>
+using std_array_to_c_arr_t =
+  typename decltype(std_array_to_c_arr_detail::std_array_to_c_arr_helper(
+    std::declval<T>()))::type;
+
+template<typename T>
+using dereference_result_t =
+  std::conditional_t<std::is_pointer_v<T>,
+                     std::remove_pointer_t<T>,
+                     std::remove_extent_t<std_array_to_c_arr_t<T>> // is_array
+                     >;
+
+template<typename T>
+using value_type_t =
+  std::conditional_t<std::is_array_v<T>, c_to_std_array_t<T>, T>;
+
+template<typename T>
+using function_ptr_t =
+  std::conditional_t<std::is_pointer_v<T> &&
+                       std::is_function_v<std::remove_pointer_t<T>>,
+                     T,
+                     int (*)(int)>;
+
+namespace is_c_or_std_array_detail {
+  template<typename T, typename T_Enable = void>
+  struct is_c_or_std_array_helper;
+
+  template<typename T>
+  struct is_c_or_std_array_helper<T, std::enable_if_t<std::is_array_v<T>>>
+    : std::true_type
+  {};
+
+  template<typename T, size_t N>
+  std::true_type is_std_array_helper(std::array<T, N>*);
+
+  template<typename T>
+  std::false_type is_std_array_helper(T*);
+
+  template<typename T>
+  constexpr bool is_std_array_v =
+    decltype(is_std_array_helper(std::declval<std::add_pointer_t<T>>()))::value;
+
+  template<typename T>
+  struct is_c_or_std_array_helper<T, std::enable_if_t<is_std_array_v<T>>>
+    : std::true_type
+  {};
+
+  template<typename T>
+  struct is_c_or_std_array_helper<
+    T,
+    std::enable_if_t<!std::is_array_v<T> && !is_std_array_v<T>>>
+    : std::false_type
+  {};
+}
+
+template<typename T>
+constexpr bool is_std_array_v = is_c_or_std_array_detail::is_std_array_v<T>;
+
+template<typename T>
+constexpr bool is_c_or_std_array_v =
+  is_c_or_std_array_detail::is_c_or_std_array_helper<T>::value;
+
+namespace std_array_el_detail {
+  template<typename T>
+  struct W
+  {
+    using type = T;
+  };
+
+  template<typename T, size_t N>
+  W<T> is_std_array_helper(std::array<T, N>*);
+
+  template<typename T>
+  W<void> is_std_array_helper(T*);
+
+  template<typename T>
+  using std_array_el_t = decltype(std_array_el_detail::is_std_array_helper(
+    std::declval<std::add_pointer_t<T>>));
+}
+
+template<typename T>
+using std_array_el_t = typename std_array_el_detail::std_array_el_t<T>::type;
+
+namespace all_extents_same_detail {
+
+  template<typename T1, typename T2, typename T_Enable = void>
+  struct all_extents_same_helper;
+
+  template<typename T1, typename T2>
+  struct all_extents_same_helper<
+    T1,
+    T2,
+    std::enable_if_t<std::rank_v<T1> != std::rank_v<T2>>> : std::false_type
+  {};
+
+  template<typename T1, typename T2>
+  struct all_extents_same_helper<
+    T1,
+    T2,
+    std::enable_if_t<std::rank_v<T1> == std::rank_v<T2> &&
+                     !std::is_array_v<T1> && !std::is_array_v<T2>>>
+    : std::true_type
+  {};
+
+  template<typename T1, typename T2>
+  struct all_extents_same_helper<
+    T1,
+    T2,
+    std::enable_if_t<std::rank_v<T1> == std::rank_v<T2> &&
+                     std::is_array_v<T1> && std::is_array_v<T2> &&
+                     std::extent_v<T1> != std::extent_v<T2>>> : std::false_type
+  {};
+
+  template<typename T1, typename T2>
+  struct all_extents_same_helper<
+    T1,
+    T2,
+    std::enable_if_t<std::rank_v<T1> == std::rank_v<T2> &&
+                     std::is_array_v<T1> && std::is_array_v<T2> &&
+                     std::extent_v<T1> == std::extent_v<T2>>>
+  {
+    static constexpr bool value =
+      all_extents_same_helper<std::remove_extent_t<T1>,
+                              std::remove_extent_t<T2>>::value;
+  };
+}
+
+template<typename T1, typename T2>
+constexpr bool all_extents_same =
+  all_extents_same_detail::all_extents_same_helper<T1, T2>::value;
+
+// remove all pointers/extent types
+namespace remove_all_pointers_detail {
+  template<typename T>
+  struct remove_all_pointers
+  {
+    typedef T type;
+  };
+
+  template<typename T>
+  struct remove_all_pointers<T*>
+  {
+    typedef typename remove_all_pointers<T>::type type;
+  };
+}
+
+template<typename T>
+using remove_all_pointers_t =
+  typename remove_all_pointers_detail::remove_all_pointers<T>::type;
+
+// remove all pointers/extent types
+namespace base_type_detail {
+  template<typename T>
+  struct base_type
+  {
+    typedef T type;
+  };
+
+  template<typename T>
+  struct base_type<T*>
+  {
+    typedef typename base_type<T>::type type;
+  };
+
+  template<typename T>
+  struct base_type<T[]>
+  {
+    typedef typename base_type<T>::type type;
+  };
+
+  template<typename T, std::size_t N>
+  struct base_type<T[N]>
+  {
+    typedef typename base_type<T>::type type;
+  };
+}
+
+template<typename T>
+using base_type_t = typename base_type_detail::base_type<T>::type;
+
+// convert types
+namespace convert_detail {
+  template<typename T,
+           typename T_ShortType,
+           typename T_IntType,
+           typename T_LongType,
+           typename T_LongLongType,
+           typename T_PointerType,
+           typename T_Enable = void>
+  struct convert_base_types_t_helper;
+
+  template<typename T,
+           typename T_ShortType,
+           typename T_IntType,
+           typename T_LongType,
+           typename T_LongLongType,
+           typename T_PointerType>
+  struct convert_base_types_t_helper<
+    T,
+    T_ShortType,
+    T_IntType,
+    T_LongType,
+    T_LongLongType,
+    T_PointerType,
+    std::enable_if_t<std::is_same_v<short, T> && !std::is_const_v<T>>>
+  {
+    using type = T_ShortType;
+  };
+
+  template<typename T,
+           typename T_ShortType,
+           typename T_IntType,
+           typename T_LongType,
+           typename T_LongLongType,
+           typename T_PointerType>
+  struct convert_base_types_t_helper<
+    T,
+    T_ShortType,
+    T_IntType,
+    T_LongType,
+    T_LongLongType,
+    T_PointerType,
+    std::enable_if_t<std::is_same_v<int, T> && !std::is_const_v<T>>>
+  {
+    using type = T_IntType;
+  };
+
+  template<typename T,
+           typename T_ShortType,
+           typename T_IntType,
+           typename T_LongType,
+           typename T_LongLongType,
+           typename T_PointerType>
+  struct convert_base_types_t_helper<
+    T,
+    T_ShortType,
+    T_IntType,
+    T_LongType,
+    T_LongLongType,
+    T_PointerType,
+    std::enable_if_t<std::is_same_v<long, T> && !std::is_const_v<T>>>
+  {
+    using type = T_LongType;
+  };
+
+  template<typename T,
+           typename T_ShortType,
+           typename T_IntType,
+           typename T_LongType,
+           typename T_LongLongType,
+           typename T_PointerType>
+  struct convert_base_types_t_helper<
+    T,
+    T_ShortType,
+    T_IntType,
+    T_LongType,
+    T_LongLongType,
+    T_PointerType,
+    std::enable_if_t<std::is_same_v<long long, T> && !std::is_const_v<T>>>
+  {
+    using type = T_LongLongType;
+  };
+
+  template<typename T,
+           typename T_ShortType,
+           typename T_IntType,
+           typename T_LongType,
+           typename T_LongLongType,
+           typename T_PointerType>
+  struct convert_base_types_t_helper<
+    T,
+    T_ShortType,
+    T_IntType,
+    T_LongType,
+    T_LongLongType,
+    T_PointerType,
+    std::enable_if_t<std::is_pointer_v<T> && !std::is_const_v<T>>>
+  {
+    using type = T_PointerType;
+  };
+
+  template<typename T,
+           typename T_ShortType,
+           typename T_IntType,
+           typename T_LongType,
+           typename T_LongLongType,
+           typename T_PointerType>
+  struct convert_base_types_t_helper<
+    T,
+    T_ShortType,
+    T_IntType,
+    T_LongType,
+    T_LongLongType,
+    T_PointerType,
+    std::enable_if_t<std::is_unsigned_v<T> && !std::is_same_v<T, bool> &&
+                     !std::is_same_v<T, char> && !std::is_const_v<T> &&
+                     !std::is_enum_v<T>>>
+  {
+    using type = std::make_unsigned_t<
+      typename convert_base_types_t_helper<std::make_signed_t<T>,
+                                           T_ShortType,
+                                           T_IntType,
+                                           T_LongType,
+                                           T_LongLongType,
+                                           T_PointerType>::type>;
+  };
+
+  template<typename T,
+           typename T_ShortType,
+           typename T_IntType,
+           typename T_LongType,
+           typename T_LongLongType,
+           typename T_PointerType>
+  struct convert_base_types_t_helper<
+    T,
+    T_ShortType,
+    T_IntType,
+    T_LongType,
+    T_LongLongType,
+    T_PointerType,
+    std::enable_if_t<(
+      std::is_same_v<bool, T> || std::is_same_v<void, T> ||
+      std::is_same_v<char, T> || std::is_same_v<signed char, T> ||
+      std::is_floating_point_v<T> || std::is_enum_v<T>)&&!std::is_const_v<T>>>
+  {
+    using type = T;
+  };
+
+  template<typename T,
+           typename T_ShortType,
+           typename T_IntType,
+           typename T_LongType,
+           typename T_LongLongType,
+           typename T_PointerType>
+  struct convert_base_types_t_helper<
+    T,
+    T_ShortType,
+    T_IntType,
+    T_LongType,
+    T_LongLongType,
+    T_PointerType,
+    std::enable_if_t<std::is_array_v<T> && !std::is_const_v<T>>>
+  {
+    using type = typename convert_base_types_t_helper<
+      std::remove_extent_t<T>,
+      T_ShortType,
+      T_IntType,
+      T_LongType,
+      T_LongLongType,
+      T_PointerType>::type[std::extent_v<T>];
+  };
+
+  template<typename T,
+           typename T_ShortType,
+           typename T_IntType,
+           typename T_LongType,
+           typename T_LongLongType,
+           typename T_PointerType>
+  struct convert_base_types_t_helper<T,
+                                     T_ShortType,
+                                     T_IntType,
+                                     T_LongType,
+                                     T_LongLongType,
+                                     T_PointerType,
+                                     std::enable_if_t<std::is_const_v<T>>>
+  {
+    using type = std::add_const_t<
+      typename convert_base_types_t_helper<std::remove_const_t<T>,
+                                           T_ShortType,
+                                           T_IntType,
+                                           T_LongType,
+                                           T_LongLongType,
+                                           T_PointerType>::type>;
+  };
+}
+
+template<typename T,
+         typename T_ShortType,
+         typename T_IntType,
+         typename T_LongType,
+         typename T_LongLongType,
+         typename T_PointerType>
+using convert_base_types_t =
+  typename convert_detail::convert_base_types_t_helper<T,
+                                                       T_ShortType,
+                                                       T_IntType,
+                                                       T_LongType,
+                                                       T_LongLongType,
+                                                       T_PointerType>::type;
+
+namespace unsigned_int_of_size_t_detail {
+  template<typename T, typename T_Enable = void>
+  struct unsigned_int_of_size_t_helper;
+
+  template<typename T>
+  struct unsigned_int_of_size_t_helper<T, std::enable_if_t<sizeof(T) == 1>>
+  {
+    using type = uint8_t;
+  };
+
+  template<typename T>
+  struct unsigned_int_of_size_t_helper<T, std::enable_if_t<sizeof(T) == 2>>
+  {
+    using type = uint16_t;
+  };
+
+  template<typename T>
+  struct unsigned_int_of_size_t_helper<T, std::enable_if_t<sizeof(T) == 4>>
+  {
+    using type = uint32_t;
+  };
+
+  template<typename T>
+  struct unsigned_int_of_size_t_helper<T, std::enable_if_t<sizeof(T) == 8>>
+  {
+    using type = uint64_t;
+  };
+}
+
+template<typename T>
+using unsigned_int_of_size_t =
+  typename unsigned_int_of_size_t_detail::unsigned_int_of_size_t_helper<
+    T>::type;
+
+}
\ No newline at end of file
diff --git a/third_party/rlbox/include/rlbox_types.hpp b/third_party/rlbox/include/rlbox_types.hpp
new file mode 100644
index 0000000000..b5821929da
--- /dev/null
+++ b/third_party/rlbox/include/rlbox_types.hpp
@@ -0,0 +1,87 @@
+#pragma once
+// IWYU pragma: private, include "rlbox.hpp"
+// IWYU pragma: friend "rlbox_.*\.hpp"
+
+namespace rlbox {
+
+template<typename T, typename T_Sbx>
+class tainted_opaque
+{
+private:
+  T data{ 0 };
+
+public:
+  template<typename T2 = T>
+  void set_zero()
+  {
+    data = 0;
+  }
+};
+
+template<typename T, typename T_Sbx>
+class tainted;
+
+template<typename T, typename T_Sbx>
+class tainted_volatile;
+
+class tainted_boolean_hint;
+
+class tainted_int_hint;
+
+template<typename T_Sbx>
+class rlbox_sandbox;
+
+template<typename T, typename T_Sbx>
+class sandbox_callback;
+
+template<typename T, typename T_Sbx>
+class app_pointer;
+
+class rlbox_noop_sandbox;
+
+class rlbox_dylib_sandbox;
+}
+
+#define RLBOX_DEFINE_BASE_TYPES_FOR(SBXNAME, SBXTYPE)                          \
+  namespace rlbox {                                                            \
+    class rlbox_##SBXTYPE##_sandbox;                                           \
+  }                                                                            \
+  using rlbox_##SBXNAME##_sandbox_type = rlbox::rlbox_##SBXTYPE##_sandbox;     \
+  using rlbox_sandbox_##SBXNAME =                                              \
+    rlbox::rlbox_sandbox<rlbox_##SBXNAME##_sandbox_type>;                      \
+  template<typename T>                                                         \
+  using sandbox_callback_##SBXNAME =                                           \
+    rlbox::sandbox_callback<T, rlbox_##SBXNAME##_sandbox_type>;                \
+  template<typename T>                                                         \
+  using tainted_##SBXNAME = rlbox::tainted<T, rlbox_##SBXNAME##_sandbox_type>; \
+  template<typename T>                                                         \
+  using tainted_opaque_##SBXNAME =                                             \
+    rlbox::tainted_opaque<T, rlbox_##SBXNAME##_sandbox_type>;                  \
+  template<typename T>                                                         \
+  using tainted_volatile_##SBXNAME =                                           \
+    rlbox::tainted_volatile<T, rlbox_##SBXNAME##_sandbox_type>;                \
+  using rlbox::tainted_boolean_hint;                                           \
+  template<typename T>                                                         \
+  using app_pointer_##SBXNAME =                                                \
+    rlbox::app_pointer<T, rlbox_##SBXNAME##_sandbox_type>;
+
+// This is like RLBOX_DEFINE_BASE_TYPES_FOR but with an explicit sandbox type
+#define RLBOX_DEFINE_BASE_TYPES_FOR_TYPE(SBXNAME, SBXTYPE)                     \
+  using rlbox_##SBXNAME##_sandbox_type = SBXTYPE;                              \
+  using rlbox_sandbox_##SBXNAME =                                              \
+    rlbox::rlbox_sandbox<rlbox_##SBXNAME##_sandbox_type>;                      \
+  template<typename T>                                                         \
+  using sandbox_callback_##SBXNAME =                                           \
+    rlbox::sandbox_callback<T, rlbox_##SBXNAME##_sandbox_type>;                \
+  template<typename T>                                                         \
+  using tainted_##SBXNAME = rlbox::tainted<T, rlbox_##SBXNAME##_sandbox_type>; \
+  template<typename T>                                                         \
+  using tainted_opaque_##SBXNAME =                                             \
+    rlbox::tainted_opaque<T, rlbox_##SBXNAME##_sandbox_type>;                  \
+  template<typename T>                                                         \
+  using tainted_volatile_##SBXNAME =                                           \
+    rlbox::tainted_volatile<T, rlbox_##SBXNAME##_sandbox_type>;                \
+  using rlbox::tainted_boolean_hint;                                           \
+  template<typename T>                                                         \
+  using app_pointer_##SBXNAME =                                                \
+    rlbox::app_pointer<T, rlbox_##SBXNAME##_sandbox_type>;
diff --git a/third_party/rlbox/include/rlbox_unwrap.hpp b/third_party/rlbox/include/rlbox_unwrap.hpp
new file mode 100644
index 0000000000..2cd00fe6ff
--- /dev/null
+++ b/third_party/rlbox/include/rlbox_unwrap.hpp
@@ -0,0 +1,25 @@
+#pragma once
+// IWYU pragma: private, include "rlbox.hpp"
+// IWYU pragma: friend "rlbox_.*\.hpp"
+
+#include <type_traits>
+
+#include "rlbox_type_traits.hpp"
+#include "rlbox_types.hpp"
+
+namespace rlbox::detail {
+
+template<typename T_Rhs>
+inline auto unwrap_value(T_Rhs&& rhs) noexcept
+{
+  using T_RhsNoQ = detail::remove_cv_ref_t<T_Rhs>;
+  if constexpr (detail::rlbox_is_wrapper_v<T_RhsNoQ>) {
+    return rhs.INTERNAL_unverified_safe();
+  } else if constexpr (detail::rlbox_is_tainted_boolean_hint_v<T_RhsNoQ>) {
+    return rhs.INTERNAL_unverified_safe();
+  } else {
+    return rhs;
+  }
+}
+
+}
\ No newline at end of file
diff --git a/third_party/rlbox/include/rlbox_wrapper_traits.hpp b/third_party/rlbox/include/rlbox_wrapper_traits.hpp
new file mode 100644
index 0000000000..45ce5a93da
--- /dev/null
+++ b/third_party/rlbox/include/rlbox_wrapper_traits.hpp
@@ -0,0 +1,171 @@
+#pragma once
+// IWYU pragma: private, include "rlbox.hpp"
+// IWYU pragma: friend "rlbox_.*\.hpp"
+
+#include <type_traits>
+
+#include "rlbox_types.hpp"
+
+namespace rlbox::detail {
+
+#define rlbox_generate_wrapper_check(name)                                     \
+  namespace detail_rlbox_is_##name                                             \
+  {                                                                            \
+    template<typename T>                                                       \
+    struct unwrapper : std::false_type                                         \
+    {};                                                                        \
+                                                                               \
+    template<typename T, typename T_Sbx>                                       \
+    struct unwrapper<name<T, T_Sbx>> : std::true_type                          \
+    {};                                                                        \
+  }                                                                            \
+                                                                               \
+  template<typename T>                                                         \
+  constexpr bool rlbox_is_##name##_v =                                         \
+    detail_rlbox_is_##name::unwrapper<T>::value;                               \
+  RLBOX_REQUIRE_SEMI_COLON
+
+rlbox_generate_wrapper_check(tainted);
+rlbox_generate_wrapper_check(tainted_volatile);
+rlbox_generate_wrapper_check(tainted_opaque);
+rlbox_generate_wrapper_check(sandbox_callback);
+
+#undef rlbox_generate_wrapper_check
+
+namespace detail_rlbox_is_tainted_boolean_hint {
+  template<typename T>
+  struct unwrapper : std::false_type
+  {};
+
+  template<>
+  struct unwrapper<tainted_boolean_hint> : std::true_type
+  {};
+}
+
+template<typename T>
+constexpr bool rlbox_is_tainted_boolean_hint_v =
+  detail_rlbox_is_tainted_boolean_hint::unwrapper<T>::value;
+
+template<typename T>
+constexpr bool rlbox_is_tainted_or_vol_v =
+  rlbox_is_tainted_v<T> || rlbox_is_tainted_volatile_v<T>;
+
+template<typename T>
+constexpr bool rlbox_is_tainted_or_opaque_v =
+  rlbox_is_tainted_v<T> || rlbox_is_tainted_opaque_v<T>;
+
+// tainted_hint is NOT considered a wrapper type... This carries no particular
+// significant and is just a convention choice
+template<typename T>
+constexpr bool rlbox_is_wrapper_v =
+  rlbox_is_tainted_v<T> || rlbox_is_tainted_volatile_v<T> ||
+  rlbox_is_tainted_opaque_v<T> || rlbox_is_sandbox_callback_v<T>;
+
+namespace detail_rlbox_remove_wrapper {
+  template<typename T>
+  struct unwrapper
+  {
+    using type = T;
+    using type_sbx = void;
+  };
+
+  template<typename T, typename T_Sbx>
+  struct unwrapper<tainted<T, T_Sbx>>
+  {
+    using type = T;
+    using type_sbx = T_Sbx;
+  };
+
+  template<typename T, typename T_Sbx>
+  struct unwrapper<tainted_volatile<T, T_Sbx>>
+  {
+    using type = T;
+    using type_sbx = T_Sbx;
+  };
+
+  template<typename T, typename T_Sbx>
+  struct unwrapper<tainted_opaque<T, T_Sbx>>
+  {
+    using type = T;
+    using type_sbx = T_Sbx;
+  };
+
+  template<typename T, typename T_Sbx>
+  struct unwrapper<sandbox_callback<T, T_Sbx>>
+  {
+    using type = T;
+    using type_sbx = T_Sbx;
+  };
+}
+
+template<typename T>
+using rlbox_remove_wrapper_t =
+  typename detail_rlbox_remove_wrapper::unwrapper<T>::type;
+
+template<typename T>
+using rlbox_get_wrapper_sandbox_t =
+  typename detail_rlbox_remove_wrapper::unwrapper<T>::type_sbx;
+
+template<typename T, typename T_Sbx>
+using rlbox_tainted_opaque_to_tainted_t =
+  std::conditional_t<rlbox_is_tainted_opaque_v<T>,
+                     tainted<rlbox_remove_wrapper_t<T>, T_Sbx>,
+                     T>;
+
+// https://stackoverflow.com/questions/34974844/check-if-a-type-is-from-a-particular-namespace
+namespace detail_is_member_of_rlbox_detail {
+  template<typename T, typename = void>
+  struct is_member_of_rlbox_detail_helper : std::false_type
+  {};
+
+  template<typename T>
+  struct is_member_of_rlbox_detail_helper<
+    T,
+    decltype(struct_is_member_of_rlbox_detail(std::declval<T>()))>
+    : std::true_type
+  {};
+}
+
+template<typename T>
+void struct_is_member_of_rlbox_detail(T&&);
+
+template<typename T>
+constexpr auto is_member_of_rlbox_detail =
+  detail_is_member_of_rlbox_detail::is_member_of_rlbox_detail_helper<T>::value;
+
+// https://stackoverflow.com/questions/9644477/how-to-check-whether-a-class-has-specified-nested-class-definition-or-typedef-in
+namespace detail_has_member_using_can_grant_deny_access {
+  template<class T, class Enable = void>
+  struct has_member_using_can_grant_deny_access : std::false_type
+  {};
+
+  template<class T>
+  struct has_member_using_can_grant_deny_access<
+    T,
+    std::void_t<typename T::can_grant_deny_access>> : std::true_type
+  {};
+}
+
+template<class T>
+constexpr bool has_member_using_can_grant_deny_access_v =
+  detail_has_member_using_can_grant_deny_access::
+    has_member_using_can_grant_deny_access<T>::value;
+
+namespace detail_has_member_using_needs_internal_lookup_symbol {
+  template<class T, class Enable = void>
+  struct has_member_using_needs_internal_lookup_symbol : std::false_type
+  {};
+
+  template<class T>
+  struct has_member_using_needs_internal_lookup_symbol<
+    T,
+    std::void_t<typename T::needs_internal_lookup_symbol>> : std::true_type
+  {};
+}
+
+template<class T>
+constexpr bool has_member_using_needs_internal_lookup_symbol_v =
+  detail_has_member_using_needs_internal_lookup_symbol::
+    has_member_using_needs_internal_lookup_symbol<T>::value;
+
+}
\ No newline at end of file
diff --git a/third_party/rlbox/update.sh b/third_party/rlbox/update.sh
new file mode 100755
index 0000000000..28bb1eac2f
--- /dev/null
+++ b/third_party/rlbox/update.sh
@@ -0,0 +1,28 @@
+#!/bin/sh
+
+# Script to update the mozilla in-tree copy of the rlbox library.
+# Run this within the /third_party/rlbox directory of the source tree.
+
+MY_TEMP_DIR=`mktemp -d -t rlbox_update.XXXXXX` || exit 1
+
+git clone https://github.com/PLSysSec/rlbox_sandboxing_api ${MY_TEMP_DIR}/rlbox
+
+COMMIT=$(git -C ${MY_TEMP_DIR}/rlbox rev-parse HEAD)
+perl -p -i -e "s/\[commit [0-9a-f]{40}\]/[commit ${COMMIT}]/" README-mozilla;
+
+FILES="include"
+
+for f in $FILES; do
+    rm -rf $f
+    mv ${MY_TEMP_DIR}/rlbox/code/$f $f
+done
+
+rm -rf ${MY_TEMP_DIR}
+
+hg addremove $FILES
+
+echo "###"
+echo "### Updated rlbox to $COMMIT."
+echo "### Remember to update any newly added files to /config/external/rlbox/moz.build"
+echo "### Remember to verify and commit the changes to source control!"
+echo "###"