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AK: Add platform macros to detect presence of AddressSanitizer

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The ASAN_[UN]POISON_MEMORY_REGION macros can be used to manually notify
the AddressSanitizer runtime about the reachability of instrumented code
accessing a memory region. This is most useful for manually managed
heaps and arenas that do not go directly to malloc or alligned_alloc.
This commit is contained in:
Andrew Kaster 2021-05-27 17:49:40 -06:00 • committed by Andreas Kling
parent 5e1c1eb840
commit 212365130d
1 changed files with 14 additions and 0 deletions
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14
AK/Platform.h
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@ -45,6 +45,20 @@
#endif
#define NO_SANITIZE_ADDRESS [[gnu::no_sanitize_address]]
// GCC doesn't have __has_feature but clang does
#ifndef __has_feature
# define __has_feature(...) 0
#endif
#if __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__)
# define HAS_ADDRESS_SANITIZER
# define ASAN_POISON_MEMORY_REGION(addr, size) __asan_poison_memory_region(addr, size)
# define ASAN_UNPOISON_MEMORY_REGION(addr, size) __asan_unpoison_memory_region(addr, size)
#else
# define ASAN_POISON_MEMORY_REGION(addr, size)
# define ASAN_UNPOISON_MEMORY_REGION(addr, size)
#endif
#ifndef __serenity__
# include <unistd.h>
# undef PAGE_SIZE