The patch titled
Subject: mm: prevent KASAN false positives in kmemleak
has been added to the -mm tree. Its filename is
mm-prevent-kasan-false-positives-in-kmemleak.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-prevent-kasan-false-positives-in-kmemleak.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-prevent-kasan-false-positives-in-kmemleak.patch
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------------------------------------------------------
From: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Subject: 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@xxxxxxxxxx
Signed-off-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Andrey Ryabinin <ryabinin.a.a@xxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/kmemleak.c | 2 ++
1 file changed, 2 insertions(+)
diff -puN mm/kmemleak.c~mm-prevent-kasan-false-positives-in-kmemleak mm/kmemleak.c
--- a/mm/kmemleak.c~mm-prevent-kasan-false-positives-in-kmemleak
+++ a/mm/kmemleak.c
@@ -307,8 +307,10 @@ static void hex_dump_object(struct seq_f
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();
}
/*
_
Patches currently in -mm which might be from dvyukov@xxxxxxxxxx are
mm-prevent-kasan-false-positives-in-kmemleak.patch
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