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kasan: add tag related helper functions

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This commit adds a few helper functions, that are meant to be used to work
with tags embedded in the top byte of kernel pointers: to set, to get or
to reset the top byte.

Link: http://lkml.kernel.org/r/f6c6437bb8e143bc44f42c3c259c62e734be7935.1544099024.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrey Konovalov
2018-12-28 00:30:16 -08:00
committed by Linus Torvalds
parent 9c23f84723
commit 3c9e3aa110
6 changed files with 101 additions and 2 deletions
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13
include/linux/kasan.h
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@@ -169,6 +169,19 @@ static inline void kasan_cache_shutdown(struct kmem_cache *cache) {}
#define KASAN_SHADOW_INIT 0xFF
void kasan_init_tags(void);
void *kasan_reset_tag(const void *addr);
#else /* CONFIG_KASAN_SW_TAGS */
static inline void kasan_init_tags(void) { }
static inline void *kasan_reset_tag(const void *addr)
{
return (void *)addr;
}
#endif /* CONFIG_KASAN_SW_TAGS */
#endif /* LINUX_KASAN_H */