[PATCH v3 2/2] kasan, slub: reset tag when printing address
Kuan-Ying Lee
Kuan-Ying.Lee at mediatek.com
Wed Aug 4 02:09:57 PDT 2021
The address still includes the tags when it is printed.
With hardware tag-based kasan enabled, we will get a
false positive KASAN issue when we access metadata.
Reset the tag before we access the metadata.
Fixes: aa1ef4d7b3f6 ("kasan, mm: reset tags when accessing metadata")
Signed-off-by: Kuan-Ying Lee <Kuan-Ying.Lee at mediatek.com>
Reviewed-by: Marco Elver <elver at google.com>
---
mm/slub.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/mm/slub.c b/mm/slub.c
index b6c5205252eb..f77d8cd79ef7 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -576,8 +576,8 @@ static void print_section(char *level, char *text, u8 *addr,
unsigned int length)
{
metadata_access_enable();
- print_hex_dump(level, kasan_reset_tag(text), DUMP_PREFIX_ADDRESS,
- 16, 1, addr, length, 1);
+ print_hex_dump(level, text, DUMP_PREFIX_ADDRESS,
+ 16, 1, kasan_reset_tag((void *)addr), length, 1);
metadata_access_disable();
}
--
2.18.0
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