diff options
| author | Alexander Potapenko <glider@google.com> | 2023-03-03 17:14:32 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-03-29 02:20:11 +0300 |
| commit | 27f644dc5a77f8d9ab6d08bc7b95f8631c1530c8 (patch) | |
| tree | 27bc88f629bb4ac0192f9862ec7a2c2791f3e8fa /arch/x86/include/asm/string_64.h | |
| parent | d340292553ab48d32d3e768bbb1d11fb942fe02e (diff) | |
| download | linux-27f644dc5a77f8d9ab6d08bc7b95f8631c1530c8.tar.xz | |
x86: kmsan: use C versions of memset16/memset32/memset64
KMSAN must see as many memory accesses as possible to prevent false
positive reports. Fall back to versions of
memset16()/memset32()/memset64() implemented in lib/string.c instead of
those written in assembly.
Link: https://lkml.kernel.org/r/20230303141433.3422671-3-glider@google.com
Signed-off-by: Alexander Potapenko <glider@google.com>
Suggested-by: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Reviewed-by: Marco Elver <elver@google.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Helge Deller <deller@gmx.de>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'arch/x86/include/asm/string_64.h')
| -rw-r--r-- | arch/x86/include/asm/string_64.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/include/asm/string_64.h b/arch/x86/include/asm/string_64.h index 65537d8711ee..857d364b9888 100644 --- a/arch/x86/include/asm/string_64.h +++ b/arch/x86/include/asm/string_64.h @@ -22,6 +22,11 @@ extern void *__memcpy(void *to, const void *from, size_t len); void *memset(void *s, int c, size_t n); void *__memset(void *s, int c, size_t n); +/* + * KMSAN needs to instrument as much code as possible. Use C versions of + * memsetXX() from lib/string.c under KMSAN. + */ +#if !defined(CONFIG_KMSAN) #define __HAVE_ARCH_MEMSET16 static inline void *memset16(uint16_t *s, uint16_t v, size_t n) { @@ -57,6 +62,7 @@ static inline void *memset64(uint64_t *s, uint64_t v, size_t n) : "memory"); return s; } +#endif #define __HAVE_ARCH_MEMMOVE void *memmove(void *dest, const void *src, size_t count); |