2014-09-26 21:10 GMT+04:00 Dmitry Vyukov <dvyukov@xxxxxxxxxx>: > Looks good to me. > > We can disable kasan instrumentation of this file as well. > Yes, but why? I don't think we need that. > On Wed, Sep 24, 2014 at 5:44 AM, Andrey Ryabinin <a.ryabinin@xxxxxxxxxxx> wrote: >> kmalloc internally round up allocation size, and kmemleak >> uses rounded up size as object's size. This makes kasan >> to complain while kmemleak scans memory or calculates of object's >> checksum. The simplest solution here is to disable kasan. >> >> Signed-off-by: Andrey Ryabinin <a.ryabinin@xxxxxxxxxxx> >> --- >> mm/kmemleak.c | 6 ++++++ >> 1 file changed, 6 insertions(+) >> >> diff --git a/mm/kmemleak.c b/mm/kmemleak.c >> index 3cda50c..9bda1b3 100644 >> --- a/mm/kmemleak.c >> +++ b/mm/kmemleak.c >> @@ -98,6 +98,7 @@ >> #include <asm/processor.h> >> #include <linux/atomic.h> >> >> +#include <linux/kasan.h> >> #include <linux/kmemcheck.h> >> #include <linux/kmemleak.h> >> #include <linux/memory_hotplug.h> >> @@ -1113,7 +1114,10 @@ static bool update_checksum(struct kmemleak_object *object) >> if (!kmemcheck_is_obj_initialized(object->pointer, object->size)) >> return false; >> >> + kasan_disable_local(); >> object->checksum = crc32(0, (void *)object->pointer, object->size); >> + kasan_enable_local(); >> + >> return object->checksum != old_csum; >> } >> >> @@ -1164,7 +1168,9 @@ static void scan_block(void *_start, void *_end, >> BYTES_PER_POINTER)) >> continue; >> >> + kasan_disable_local(); >> pointer = *ptr; >> + kasan_enable_local(); >> >> object = find_and_get_object(pointer, 1); >> if (!object) >> -- >> 2.1.1 >> > -- Best regards, Andrey Ryabinin -- 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>