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authorJason A. Donenfeld <Jason@zx2c4.com>2017-10-17 20:32:07 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-11-18 11:22:23 +0100
commit38762a516e0cec3d194b2a9caf0607e3c7dad5ff (patch)
treed3804255baecaa4f877c62625bf464b5abe7ac6a /net
parent2586fa0007dc6b7745da14250be7e3aae706b128 (diff)
mac80211: use constant time comparison with keys
commit 2bdd713b92a9cade239d3c7d15205a09f556624d upstream. Otherwise we risk leaking information via timing side channel. Fixes: fdf7cb4185b6 ("mac80211: accept key reinstall without changing anything") Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com> Cc: Ben Hutchings <ben.hutchings@codethink.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
-rw-r--r--net/mac80211/key.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/mac80211/key.c b/net/mac80211/key.c
index 7c21d122c284..deb7266c1d70 100644
--- a/net/mac80211/key.c
+++ b/net/mac80211/key.c
@@ -19,6 +19,7 @@
#include <linux/slab.h>
#include <linux/export.h>
#include <net/mac80211.h>
+#include <crypto/algapi.h>
#include <asm/unaligned.h>
#include "ieee80211_i.h"
#include "driver-ops.h"
@@ -634,7 +635,7 @@ int ieee80211_key_link(struct ieee80211_key *key,
* new version of the key to avoid nonce reuse or replay issues.
*/
if (old_key && key->conf.keylen == old_key->conf.keylen &&
- !memcmp(key->conf.key, old_key->conf.key, key->conf.keylen)) {
+ !crypto_memneq(key->conf.key, old_key->conf.key, key->conf.keylen)) {
ieee80211_key_free_unused(key);
ret = 0;
goto out;