mm/kasan: add API to check memory regions
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>steinar/wifi_calib_4_9_kernel
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936bb4bbbb
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64f8ebaf11
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@ -6242,7 +6242,7 @@ S: Maintained
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F: arch/*/include/asm/kasan.h
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F: arch/*/include/asm/kasan.h
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F: arch/*/mm/kasan_init*
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F: arch/*/mm/kasan_init*
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F: Documentation/kasan.txt
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F: Documentation/kasan.txt
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F: include/linux/kasan.h
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F: include/linux/kasan*.h
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F: lib/test_kasan.c
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F: lib/test_kasan.c
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F: mm/kasan/
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F: mm/kasan/
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F: scripts/Makefile.kasan
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F: scripts/Makefile.kasan
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@ -0,0 +1,12 @@
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#ifndef _LINUX_KASAN_CHECKS_H
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#define _LINUX_KASAN_CHECKS_H
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#ifdef CONFIG_KASAN
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void kasan_check_read(const void *p, unsigned int size);
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void kasan_check_write(const void *p, unsigned int size);
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#else
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static inline void kasan_check_read(const void *p, unsigned int size) { }
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static inline void kasan_check_write(const void *p, unsigned int size) { }
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#endif
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#endif
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@ -299,6 +299,18 @@ static void check_memory_region(unsigned long addr,
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check_memory_region_inline(addr, size, write, ret_ip);
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check_memory_region_inline(addr, size, write, ret_ip);
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}
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}
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void kasan_check_read(const void *p, unsigned int size)
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{
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check_memory_region((unsigned long)p, size, false, _RET_IP_);
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}
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EXPORT_SYMBOL(kasan_check_read);
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void kasan_check_write(const void *p, unsigned int size)
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{
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check_memory_region((unsigned long)p, size, true, _RET_IP_);
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}
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EXPORT_SYMBOL(kasan_check_write);
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#undef memset
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#undef memset
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void *memset(void *addr, int c, size_t len)
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void *memset(void *addr, int c, size_t len)
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{
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{
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