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authorAndrey Ryabinin <aryabinin@virtuozzo.com>2016-05-21 02:59:28 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-05-21 03:58:30 +0300
commit64f8ebaf115bcddc4aaa902f981c57ba6506bc42 (patch)
tree11f1cba5bc8867e085236ff96861ced9a29c943e /mm
parent936bb4bbbb832f81055328b84e5afe1fc7246a8d (diff)
downloadlinux-64f8ebaf115bcddc4aaa902f981c57ba6506bc42.tar.xz
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>
Diffstat (limited to 'mm')
-rw-r--r--mm/kasan/kasan.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/mm/kasan/kasan.c b/mm/kasan/kasan.c
index e5beb40d97b1..18b6a2b8d183 100644
--- a/mm/kasan/kasan.c
+++ b/mm/kasan/kasan.c
@@ -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)
{