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| author | Dmitry Vyukov <dvyukov@google.com> | 2016-06-24 14:50:07 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-06-24 17:23:52 -0700 |
| commit | 5c335fe020ea287b2b49cc4dfca9f6756b88bb71 (patch) | |
| tree | 06c106d7e217f9b2ae6c5e76ae9d636555f13f1e | |
| parent | c8cc708a340cc7c5445565079fd4d1c28898d7a2 (diff) | |
| download | lwn-5c335fe020ea287b2b49cc4dfca9f6756b88bb71.tar.gz lwn-5c335fe020ea287b2b49cc4dfca9f6756b88bb71.zip | |
mm: prevent KASAN false positives in kmemleak
When kmemleak dumps contents of leaked objects it reads whole objects
regardless of user-requested size. This upsets KASAN. Disable KASAN
checks around object dump.
Link: http://lkml.kernel.org/r/1466617631-68387-1-git-send-email-dvyukov@google.com
Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Alexander Potapenko <glider@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/kmemleak.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/kmemleak.c b/mm/kmemleak.c index e6429926e957..04320d3adbef 100644 --- a/mm/kmemleak.c +++ b/mm/kmemleak.c @@ -307,8 +307,10 @@ static void hex_dump_object(struct seq_file *seq, len = min_t(size_t, object->size, HEX_MAX_LINES * HEX_ROW_SIZE); seq_printf(seq, " hex dump (first %zu bytes):\n", len); + kasan_disable_current(); seq_hex_dump(seq, " ", DUMP_PREFIX_NONE, HEX_ROW_SIZE, HEX_GROUP_SIZE, ptr, len, HEX_ASCII); + kasan_enable_current(); } /* |