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BACKPORT: 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>

Bug: 64145065
(cherry-picked from 64f8ebaf11)
Change-Id: I3e75c7c22e77d390c55ca1b86ec58a6d6ea1da87
Signed-off-by: Paul Lawrence <paullawrence@google.com>
This commit is contained in:
Andrey Ryabinin
2016-05-20 16:59:28 -07:00
committed by Paul Lawrence
parent d8688d3bac
commit ec4cb91ee5
3 changed files with 38 additions and 0 deletions
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12
include/linux/kasan-checks.h Normal file
View File

@@ -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