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kasan: Fix Software Tag-Based KASAN with GCC

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Per [1], -fsanitize=kernel-hwaddress with GCC currently does not disable
instrumentation in functions with __attribute__((no_sanitize_address)).

However, __attribute__((no_sanitize("hwaddress"))) does correctly
disable instrumentation. Use it instead.

Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117196 [1]
Link: https://lore.kernel.org/r/000000000000f362e80620e27859@google.com
Link: https://lore.kernel.org/r/ZvFGwKfoC4yVjN_X@J2N7QTR9R3
Link: https://bugzilla.kernel.org/show_bug.cgi?id=218854
Reported-by: syzbot+908886656a02769af987@syzkaller.appspotmail.com
Tested-by: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Andrew Pinski <pinskia@gmail.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Marco Elver <elver@google.com>
Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com>
Fixes: 7b861a53e4 ("kasan: Bump required compiler version")
Link: https://lore.kernel.org/r/20241021120013.3209481-1-elver@google.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Marco Elver 2024-10-21 14:00:10 +02:00 committed by Will Deacon
parent 7aed6a2c51
commit 894b00a335
1 changed files with 4 additions and 0 deletions
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4
include/linux/compiler-gcc.h
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@ -80,7 +80,11 @@
#define __noscs __attribute__((__no_sanitize__("shadow-call-stack")))
#endif
#ifdef __SANITIZE_HWADDRESS__
#define __no_sanitize_address __attribute__((__no_sanitize__("hwaddress")))
#else
#define __no_sanitize_address __attribute__((__no_sanitize_address__))
#endif
#if defined(__SANITIZE_THREAD__)
#define __no_sanitize_thread __attribute__((__no_sanitize_thread__))