diff options
| author | Jason A. Donenfeld <Jason@zx2c4.com> | 2017-10-17 20:32:07 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-11-18 11:11:05 +0100 |
| commit | cdac2028c90112354febf9fd6d50ae70259cae0b (patch) | |
| tree | afb84e45c562d500f5b4a5df5ed993eb9f9c7648 | |
| parent | 6440f0ee8a1779f53526bccb9de00914daeb9094 (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>
| -rw-r--r-- | net/mac80211/key.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/mac80211/key.c b/net/mac80211/key.c index 88f3fad740bf..61286227f307 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" @@ -633,7 +634,7 @@ 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; |