1 files changed, 136 insertions, 0 deletions
diff --git a/security/sandbox/chromium/sandbox/win/src/target_interceptions.cc b/security/sandbox/chromium/sandbox/win/src/target_interceptions.cc
new file mode 100644
index 0000000000..1b467814c6
--- /dev/null
+++ b/security/sandbox/chromium/sandbox/win/src/target_interceptions.cc
@@ -0,0 +1,136 @@
+// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "sandbox/win/src/target_interceptions.h"
+
+#include "base/win/static_constants.h"
+#include "sandbox/win/src/interception_agent.h"
+#include "sandbox/win/src/sandbox_factory.h"
+#include "sandbox/win/src/sandbox_nt_util.h"
+
+namespace sandbox {
+
+SANDBOX_INTERCEPT NtExports g_nt;
+
+const char KERNEL32_DLL_NAME[] = "kernel32.dll";
+
+enum SectionLoadState {
+  kBeforeKernel32,
+  kAfterKernel32,
+};
+
+// Hooks NtMapViewOfSection to detect the load of DLLs. If hot patching is
+// required for this dll, this functions patches it.
+NTSTATUS WINAPI
+TargetNtMapViewOfSection(NtMapViewOfSectionFunction orig_MapViewOfSection,
+                         HANDLE section,
+                         HANDLE process,
+                         PVOID* base,
+                         ULONG_PTR zero_bits,
+                         SIZE_T commit_size,
+                         PLARGE_INTEGER offset,
+                         PSIZE_T view_size,
+                         SECTION_INHERIT inherit,
+                         ULONG allocation_type,
+                         ULONG protect) {
+  NTSTATUS ret = orig_MapViewOfSection(section, process, base, zero_bits,
+                                       commit_size, offset, view_size, inherit,
+                                       allocation_type, protect);
+  static SectionLoadState s_state = kBeforeKernel32;
+
+  do {
+    if (!NT_SUCCESS(ret))
+      break;
+
+    if (!IsSameProcess(process))
+      break;
+
+    // Only check for verifier.dll or kernel32.dll loading if we haven't moved
+    // past that state yet.
+    if (s_state == kBeforeKernel32) {
+      const char* ansi_module_name =
+          GetAnsiImageInfoFromModule(reinterpret_cast<HMODULE>(*base));
+
+      // _strnicmp below may hit read access violations for some sections. We
+      // find what looks like a valid export directory for a PE module but the
+      // pointer to the module name will be pointing to invalid memory.
+      __try {
+        // Don't initialize the heap if verifier.dll is being loaded. This
+        // indicates Application Verifier is enabled and we should wait until
+        // the next module is loaded.
+        if (ansi_module_name &&
+            (g_nt._strnicmp(
+                 ansi_module_name, base::win::kApplicationVerifierDllName,
+                 g_nt.strlen(base::win::kApplicationVerifierDllName) + 1) == 0))
+          break;
+
+        if (ansi_module_name &&
+            (g_nt._strnicmp(ansi_module_name, KERNEL32_DLL_NAME,
+                            sizeof(KERNEL32_DLL_NAME)) == 0)) {
+          s_state = kAfterKernel32;
+        }
+      } __except (EXCEPTION_EXECUTE_HANDLER) {
+      }
+    }
+
+    if (!InitHeap())
+      break;
+
+    if (!IsValidImageSection(section, base, offset, view_size))
+      break;
+
+    UINT image_flags;
+    UNICODE_STRING* module_name =
+        GetImageInfoFromModule(reinterpret_cast<HMODULE>(*base), &image_flags);
+    UNICODE_STRING* file_name = GetBackingFilePath(*base);
+
+    if ((!module_name) && (image_flags & MODULE_HAS_CODE)) {
+      // If the module has no exports we retrieve the module name from the
+      // full path of the mapped section.
+      module_name = ExtractModuleName(file_name);
+    }
+
+    InterceptionAgent* agent = InterceptionAgent::GetInterceptionAgent();
+
+    if (agent) {
+      if (!agent->OnDllLoad(file_name, module_name, *base)) {
+        // Interception agent is demanding to un-map the module.
+        g_nt.UnmapViewOfSection(process, *base);
+        *base = nullptr;
+        ret = STATUS_UNSUCCESSFUL;
+      }
+    }
+
+    if (module_name)
+      operator delete(module_name, NT_ALLOC);
+
+    if (file_name)
+      operator delete(file_name, NT_ALLOC);
+
+  } while (false);
+
+  return ret;
+}
+
+NTSTATUS WINAPI
+TargetNtUnmapViewOfSection(NtUnmapViewOfSectionFunction orig_UnmapViewOfSection,
+                           HANDLE process,
+                           PVOID base) {
+  NTSTATUS ret = orig_UnmapViewOfSection(process, base);
+
+  if (!NT_SUCCESS(ret))
+    return ret;
+
+  if (!IsSameProcess(process))
+    return ret;
+
+  InterceptionAgent* agent = InterceptionAgent::GetInterceptionAgent();
+
+  if (agent)
+    agent->OnDllUnload(base);
+
+  return ret;
+}
+
+}  // namespace sandbox