Adding upstream version 6.6.15.upstream/6.6.15

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

1 files changed, 210 insertions, 0 deletions

diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan
new file mode 100644
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--- /dev/null
+++ b/lib/Kconfig.kasan
@@ -0,0 +1,210 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+# This config refers to the generic KASAN mode.
+config HAVE_ARCH_KASAN
+	bool
+
+config HAVE_ARCH_KASAN_SW_TAGS
+	bool
+
+config HAVE_ARCH_KASAN_HW_TAGS
+	bool
+
+config HAVE_ARCH_KASAN_VMALLOC
+	bool
+
+config ARCH_DISABLE_KASAN_INLINE
+	bool
+	help
+	  Disables both inline and stack instrumentation. Selected by
+	  architectures that do not support these instrumentation types.
+
+config CC_HAS_KASAN_GENERIC
+	def_bool $(cc-option, -fsanitize=kernel-address)
+
+config CC_HAS_KASAN_SW_TAGS
+	def_bool $(cc-option, -fsanitize=kernel-hwaddress)
+
+# This option is only required for software KASAN modes.
+# Old GCC versions do not have proper support for no_sanitize_address.
+# See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89124 for details.
+config CC_HAS_WORKING_NOSANITIZE_ADDRESS
+	def_bool !CC_IS_GCC || GCC_VERSION >= 80300
+
+menuconfig KASAN
+	bool "KASAN: dynamic memory safety error detector"
+	depends on (((HAVE_ARCH_KASAN && CC_HAS_KASAN_GENERIC) || \
+		     (HAVE_ARCH_KASAN_SW_TAGS && CC_HAS_KASAN_SW_TAGS)) && \
+		    CC_HAS_WORKING_NOSANITIZE_ADDRESS) || \
+		   HAVE_ARCH_KASAN_HW_TAGS
+	depends on (SLUB && SYSFS && !SLUB_TINY) || (SLAB && !DEBUG_SLAB)
+	select STACKDEPOT_ALWAYS_INIT
+	help
+	  Enables KASAN (Kernel Address Sanitizer) - a dynamic memory safety
+	  error detector designed to find out-of-bounds and use-after-free bugs.
+
+	  See Documentation/dev-tools/kasan.rst for details.
+
+	  For better error reports, also enable CONFIG_STACKTRACE.
+
+if KASAN
+
+config CC_HAS_KASAN_MEMINTRINSIC_PREFIX
+	def_bool (CC_IS_CLANG && $(cc-option,-fsanitize=kernel-address -mllvm -asan-kernel-mem-intrinsic-prefix=1)) || \
+		 (CC_IS_GCC && $(cc-option,-fsanitize=kernel-address --param asan-kernel-mem-intrinsic-prefix=1))
+	# Don't define it if we don't need it: compilation of the test uses
+	# this variable to decide how the compiler should treat builtins.
+	depends on !KASAN_HW_TAGS
+	help
+	  The compiler is able to prefix memintrinsics with __asan or __hwasan.
+
+choice
+	prompt "KASAN mode"
+	default KASAN_GENERIC
+	help
+	  KASAN has three modes:
+
+	  1. Generic KASAN (supported by many architectures, enabled with
+	     CONFIG_KASAN_GENERIC, similar to userspace ASan),
+	  2. Software Tag-Based KASAN (arm64 only, based on software memory
+	     tagging, enabled with CONFIG_KASAN_SW_TAGS, similar to userspace
+	     HWASan), and
+	  3. Hardware Tag-Based KASAN (arm64 only, based on hardware memory
+	     tagging, enabled with CONFIG_KASAN_HW_TAGS).
+
+	  See Documentation/dev-tools/kasan.rst for details about each mode.
+
+config KASAN_GENERIC
+	bool "Generic KASAN"
+	depends on HAVE_ARCH_KASAN && CC_HAS_KASAN_GENERIC
+	depends on CC_HAS_WORKING_NOSANITIZE_ADDRESS
+	select SLUB_DEBUG if SLUB
+	select CONSTRUCTORS
+	help
+	  Enables Generic KASAN.
+
+	  Requires GCC 8.3.0+ or Clang.
+
+	  Consumes about 1/8th of available memory at kernel start and adds an
+	  overhead of ~50% for dynamic allocations.
+	  The performance slowdown is ~x3.
+
+	  (Incompatible with CONFIG_DEBUG_SLAB: the kernel does not boot.)
+
+config KASAN_SW_TAGS
+	bool "Software Tag-Based KASAN"
+	depends on HAVE_ARCH_KASAN_SW_TAGS && CC_HAS_KASAN_SW_TAGS
+	depends on CC_HAS_WORKING_NOSANITIZE_ADDRESS
+	select SLUB_DEBUG if SLUB
+	select CONSTRUCTORS
+	help
+	  Enables Software Tag-Based KASAN.
+
+	  Requires GCC 11+ or Clang.
+
+	  Supported only on arm64 CPUs and relies on Top Byte Ignore.
+
+	  Consumes about 1/16th of available memory at kernel start and
+	  add an overhead of ~20% for dynamic allocations.
+
+	  May potentially introduce problems related to pointer casting and
+	  comparison, as it embeds a tag into the top byte of each pointer.
+
+	  (Incompatible with CONFIG_DEBUG_SLAB: the kernel does not boot.)
+
+config KASAN_HW_TAGS
+	bool "Hardware Tag-Based KASAN"
+	depends on HAVE_ARCH_KASAN_HW_TAGS
+	depends on SLUB
+	help
+	  Enables Hardware Tag-Based KASAN.
+
+	  Requires GCC 10+ or Clang 12+.
+
+	  Supported only on arm64 CPUs starting from ARMv8.5 and relies on
+	  Memory Tagging Extension and Top Byte Ignore.
+
+	  Consumes about 1/32nd of available memory.
+
+	  May potentially introduce problems related to pointer casting and
+	  comparison, as it embeds a tag into the top byte of each pointer.
+
+endchoice
+
+choice
+	prompt "Instrumentation type"
+	depends on KASAN_GENERIC || KASAN_SW_TAGS
+	default KASAN_OUTLINE
+
+config KASAN_OUTLINE
+	bool "Outline instrumentation"
+	help
+	  Makes the compiler insert function calls that check whether the memory
+	  is accessible before each memory access. Slower than KASAN_INLINE, but
+	  does not bloat the size of the kernel's .text section so much.
+
+config KASAN_INLINE
+	bool "Inline instrumentation"
+	depends on !ARCH_DISABLE_KASAN_INLINE
+	help
+	  Makes the compiler directly insert memory accessibility checks before
+	  each memory access. Faster than KASAN_OUTLINE (gives ~x2 boost for
+	  some workloads), but makes the kernel's .text size much bigger.
+
+endchoice
+
+config KASAN_STACK
+	bool "Stack instrumentation (unsafe)" if CC_IS_CLANG && !COMPILE_TEST
+	depends on KASAN_GENERIC || KASAN_SW_TAGS
+	depends on !ARCH_DISABLE_KASAN_INLINE
+	default y if CC_IS_GCC
+	help
+	  Disables stack instrumentation and thus KASAN's ability to detect
+	  out-of-bounds bugs in stack variables.
+
+	  With Clang, stack instrumentation has a problem that causes excessive
+	  stack usage, see https://bugs.llvm.org/show_bug.cgi?id=38809. Thus,
+	  with Clang, this option is deemed unsafe.
+
+	  This option is always disabled when compile-testing with Clang to
+	  avoid cluttering the log with stack overflow warnings.
+
+	  With GCC, enabling stack instrumentation is assumed to be safe.
+
+	  If the architecture disables inline instrumentation via
+	  ARCH_DISABLE_KASAN_INLINE, stack instrumentation gets disabled
+	  as well, as it adds inline-style instrumentation that is run
+	  unconditionally.
+
+config KASAN_VMALLOC
+	bool "Check accesses to vmalloc allocations"
+	depends on HAVE_ARCH_KASAN_VMALLOC
+	help
+	  Makes KASAN check the validity of accesses to vmalloc allocations.
+
+	  With software KASAN modes, all types vmalloc allocations are
+	  checked. Enabling this option leads to higher memory usage.
+
+	  With Hardware Tag-Based KASAN, only non-executable VM_ALLOC mappings
+	  are checked. There is no additional memory usage.
+
+config KASAN_KUNIT_TEST
+	tristate "KUnit-compatible tests of KASAN bug detection capabilities" if !KUNIT_ALL_TESTS
+	depends on KASAN && KUNIT && TRACEPOINTS
+	default KUNIT_ALL_TESTS
+	help
+	  A KUnit-based KASAN test suite. Triggers different kinds of
+	  out-of-bounds and use-after-free accesses. Useful for testing whether
+	  KASAN can detect certain bug types.
+
+	  For more information on KUnit and unit tests in general, please refer
+	  to the KUnit documentation in Documentation/dev-tools/kunit/.
+
+config KASAN_MODULE_TEST
+	tristate "KUnit-incompatible tests of KASAN bug detection capabilities"
+	depends on m && KASAN && !KASAN_HW_TAGS
+	help
+	  A part of the KASAN test suite that is not integrated with KUnit.
+	  Incompatible with Hardware Tag-Based KASAN.
+
+endif # KASAN