The patch titled
Subject: kasan, slub: reset tag when printing address
has been added to the -mm tree. Its filename is
kasan-slub-reset-tag-when-printing-address.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/kasan-slub-reset-tag-when-printing-address.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/kasan-slub-reset-tag-when-printing-address.patch
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The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Kuan-Ying Lee <Kuan-Ying.Lee@xxxxxxxxxxxx>
Subject: kasan, slub: reset tag when printing address
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@xxxxxxxxxxxx
Fixes: aa1ef4d7b3f6 ("kasan, mm: reset tags when accessing metadata")
Signed-off-by: Kuan-Ying Lee <Kuan-Ying.Lee@xxxxxxxxxxxx>
Reviewed-by: Marco Elver <elver@xxxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Andrey Konovalov <andreyknvl@xxxxxxxxx>
Cc: Andrey Ryabinin <ryabinin.a.a@xxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Chinwen Chang <chinwen.chang@xxxxxxxxxxxx>
Cc: Nicholas Tang <nicholas.tang@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/slub.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/mm/slub.c~kasan-slub-reset-tag-when-printing-address
+++ a/mm/slub.c
@@ -576,8 +576,8 @@ 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();
}
_
Patches currently in -mm which might be from Kuan-Ying.Lee@xxxxxxxxxxxx are
kasan-kmemleak-reset-tags-when-scanning-block.patch
kasan-slub-reset-tag-when-printing-address.patch
