From: Kuan-Ying Lee Kuan-Ying.Lee@mediatek.com
commit 340caf178ddc2efb0294afaf54c715f7928c258e upstream.
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.
Link: https://lkml.kernel.org/r/20210804090957.12393-3-Kuan-Ying.Lee@mediatek.com Fixes: aa1ef4d7b3f6 ("kasan, mm: reset tags when accessing metadata") Signed-off-by: Kuan-Ying Lee Kuan-Ying.Lee@mediatek.com Reviewed-by: Marco Elver elver@google.com Reviewed-by: Andrey Konovalov andreyknvl@gmail.com Cc: Alexander Potapenko glider@google.com Cc: Andrey Ryabinin ryabinin.a.a@gmail.com Cc: Catalin Marinas catalin.marinas@arm.com Cc: Chinwen Chang chinwen.chang@mediatek.com Cc: Nicholas Tang nicholas.tang@mediatek.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- mm/slub.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/mm/slub.c +++ b/mm/slub.c @@ -551,8 +551,8 @@ static void print_section(char *level, c 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(); }