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[v5,1/2] mm/slab: Use memzero_explicit() in kzfree()

Message ID 20200616154311.12314-2-longman@redhat.com
State Accepted
Commit 8982ae527fbef170ef298650c15d55a9ccd33973
Headers show
Series [v5,1/2] mm/slab: Use memzero_explicit() in kzfree() | expand

Commit Message

Waiman Long June 16, 2020, 3:43 p.m. UTC
The kzfree() function is normally used to clear some sensitive
information, like encryption keys, in the buffer before freeing it back
to the pool. Memset() is currently used for buffer clearing. However
unlikely, there is still a non-zero probability that the compiler may
choose to optimize away the memory clearing especially if LTO is being
used in the future. To make sure that this optimization will never
happen, memzero_explicit(), which is introduced in v3.18, is now used
in kzfree() to future-proof it.

Fixes: 3ef0e5ba4673 ("slab: introduce kzfree()")
Cc: stable@vger.kernel.org
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Waiman Long <longman@redhat.com>
---
 mm/slab_common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/mm/slab_common.c b/mm/slab_common.c
index 9e72ba224175..37d48a56431d 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -1726,7 +1726,7 @@  void kzfree(const void *p)
 	if (unlikely(ZERO_OR_NULL_PTR(mem)))
 		return;
 	ks = ksize(mem);
-	memset(mem, 0, ks);
+	memzero_explicit(mem, ks);
 	kfree(mem);
 }
 EXPORT_SYMBOL(kzfree);