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kasan: Allow kasan_check_read/write() to accept pointers to volatiles 

Currently kasan_check_read/write() accept 'const void*', make them
accept 'const volatile void*'. This is required for instrumentation
of atomic operations and there is just no reason to not allow that.

Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Reviewed-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: kasan-dev@googlegroups.com
Cc: linux-mm@kvack.org
Cc: will.deacon@arm.com
Link: http://lkml.kernel.org/r/33e5ec275c1ee89299245b2ebbccd63709c6021f.1498140838.git.dvyukov@google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Dmitry Vyukov 2017-06-22 16:14:17 +02:00 committed by Ingo Molnar
parent 25547b6b08
commit f06e8c584f
2 changed files with 8 additions and 6 deletions
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10
include/linux/kasan-checks.h
View File

@ -2,11 +2,13 @@
#define _LINUX_KASAN_CHECKS_H
#ifdef CONFIG_KASAN
void kasan_check_read(const void *p, unsigned int size);
void kasan_check_write(const void *p, unsigned int size);
void kasan_check_read(const volatile void *p, unsigned int size);
void kasan_check_write(const volatile void *p, unsigned int size);
#else
static inline void kasan_check_read(const void *p, unsigned int size) { }
static inline void kasan_check_write(const void *p, unsigned int size) { }
static inline void kasan_check_read(const volatile void *p, unsigned int size)
{ }
static inline void kasan_check_write(const volatile void *p, unsigned int size)
{ }
#endif
#endif

4
mm/kasan/kasan.c
View File

@ -267,13 +267,13 @@ static void check_memory_region(unsigned long addr,
check_memory_region_inline(addr, size, write, ret_ip);
}
void kasan_check_read(const void *p, unsigned int size)
void kasan_check_read(const volatile void *p, unsigned int size)
{
check_memory_region((unsigned long)p, size, false, _RET_IP_);
}
EXPORT_SYMBOL(kasan_check_read);
void kasan_check_write(const void *p, unsigned int size)
void kasan_check_write(const volatile void *p, unsigned int size)
{
check_memory_region((unsigned long)p, size, true, _RET_IP_);
}