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Kernel: Add initial basic support for KASAN

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This commit adds minimal support for compiler-instrumentation based
memory access sanitization.
Currently we only support detection of kmalloc redzone accesses, and
kmalloc use-after-free accesses.

Support for inline checks (for improved performance), and for stack
use-after-return and use-after-return detection is left for future PRs.
This commit is contained in:
Idan Horowitz 2023-12-29 02:36:39 +02:00 • committed by Andreas Kling
parent 7ad7ae7000
commit f7a1f28d7f
10 changed files with 538 additions and 63 deletions
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10
Kernel/CMakeLists.txt
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@ -722,11 +722,15 @@ if (ENABLE_KERNEL_UNDEFINED_SANITIZER)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=undefined")
endif()
# Kernel Address Sanitize (KASAN) implementation is still a work in progress, this option
# is not currently meant to be used, besides when developing Kernel ASAN support.
#
if (ENABLE_KERNEL_ADDRESS_SANITIZER)
add_compile_options(-fsanitize=kernel-address)
if(CMAKE_CXX_COMPILER_ID MATCHES "Clang$")
# TODO: Support inline KASAN for improved performance
add_compile_options("SHELL:-mllvm -asan-instrumentation-with-call-threshold=0")
# TODO: Support KASAN stack poisoning (inline) for use-after-return and use-after-scope detection
add_compile_options("SHELL:-mllvm -asan-stack=0")
endif()
set_source_files_properties(Security/AddressSanitizer.cpp PROPERTIES COMPILE_FLAGS "-fno-sanitize=kernel-address")
add_link_options(-fsanitize=kernel-address)
endif()