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mm/kasan: add API to check memory regions

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Memory access coded in an assembly won't be seen by KASAN as a compiler
can instrument only C code.  Add kasan_check_[read,write]() API which is
going to be used to check a certain memory range.

Link: http://lkml.kernel.org/r/1462538722-1574-3-git-send-email-aryabinin@virtuozzo.com
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Acked-by: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrey Ryabinin 2016-05-20 16:59:28 -07:00 committed by Linus Torvalds
parent 936bb4bbbb
commit 64f8ebaf11
3 changed files with 25 additions and 1 deletions
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2
MAINTAINERS
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@ -6242,7 +6242,7 @@ S: Maintained
F: arch/*/include/asm/kasan.h
F: arch/*/mm/kasan_init*
F: Documentation/kasan.txt
F: include/linux/kasan.h
F: include/linux/kasan*.h
F: lib/test_kasan.c
F: mm/kasan/
F: scripts/Makefile.kasan

12
include/linux/kasan-checks.h Normal file
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@ -0,0 +1,12 @@
#ifndef _LINUX_KASAN_CHECKS_H
#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);
#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) { }
#endif
#endif

12
mm/kasan/kasan.c
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@ -299,6 +299,18 @@ 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)
{
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)
{
check_memory_region((unsigned long)p, size, true, _RET_IP_);
}
EXPORT_SYMBOL(kasan_check_write);
#undef memset
void *memset(void *addr, int c, size_t len)
{