Commit 8982ae52 authored by Waiman Long's avatar Waiman Long Committed by Linus Torvalds

mm/slab: use memzero_explicit() in kzfree()

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.

Link: http://lkml.kernel.org/r/20200616154311.12314-2-longman@redhat.com
Fixes: 3ef0e5ba ("slab: introduce kzfree()")
Signed-off-by: default avatarWaiman Long <longman@redhat.com>
Acked-by: default avatarMichal Hocko <mhocko@suse.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Cc: James Morris <jmorris@namei.org>
Cc: "Serge E. Hallyn" <serge@hallyn.com>
Cc: Joe Perches <joe@perches.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Cc: "Jason A . Donenfeld" <Jason@zx2c4.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent d7670879
...@@ -1726,7 +1726,7 @@ void kzfree(const void *p) ...@@ -1726,7 +1726,7 @@ void kzfree(const void *p)
if (unlikely(ZERO_OR_NULL_PTR(mem))) if (unlikely(ZERO_OR_NULL_PTR(mem)))
return; return;
ks = ksize(mem); ks = ksize(mem);
memset(mem, 0, ks); memzero_explicit(mem, ks);
kfree(mem); kfree(mem);
} }
EXPORT_SYMBOL(kzfree); EXPORT_SYMBOL(kzfree);
......
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