Messages in this thread Patch in this message | | | From | Wang Long <> | Subject | [PATCH v2] kasan: Fix a type conversion error | Date | Wed, 9 Sep 2015 11:04:05 +0000 |
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The current KASAN code can not find the following out-of-bounds bugs: char *ptr; ptr = kmalloc(8, GFP_KERNEL); memset(ptr+7, 0, 2);
the cause of the problem is the type conversion error in *memory_is_poisoned_n* function. So this patch fix that.
Signed-off-by: Wang Long <long.wanglong@huawei.com> Acked-by: Andrey Ryabinin <aryabinin@virtuozzo.com> --- mm/kasan/kasan.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/kasan/kasan.c b/mm/kasan/kasan.c index 7b28e9c..5d65d06 100644 --- a/mm/kasan/kasan.c +++ b/mm/kasan/kasan.c @@ -204,7 +204,7 @@ static __always_inline bool memory_is_poisoned_n(unsigned long addr, s8 *last_shadow = (s8 *)kasan_mem_to_shadow((void *)last_byte); if (unlikely(ret != (unsigned long)last_shadow || - ((last_byte & KASAN_SHADOW_MASK) >= *last_shadow))) + ((long)(last_byte & KASAN_SHADOW_MASK) >= *last_shadow))) return true; } return false; -- 1.8.3.4
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