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Subject[PATCH] mm: prevent KASAN false positives in kmemleak
Date
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.

Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
---
mm/kmemleak.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index e642992..04320d3 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();
}

/*
--
2.8.0.rc3.226.g39d4020
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