On 2015/9/9 17:01, Vladimir Murzin wrote: > On 09/09/15 04:59, Wang Long wrote: >> The current KASAN code can find the following out-of-bounds > > Should it be "cannot"? > > Vladimir > sorry for that mistake, it should be "cannot". >> 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@xxxxxxxxxx> >> --- >> 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; >> > > > . > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>