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34 lines
1.2 KiB
Diff
34 lines
1.2 KiB
Diff
From 2bdd713b92a9cade239d3c7d15205a09f556624d Mon Sep 17 00:00:00 2001
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From: "Jason A. Donenfeld" <Jason@zx2c4.com>
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Date: Tue, 17 Oct 2017 20:32:07 +0200
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Subject: [PATCH] mac80211: use constant time comparison with keys
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Otherwise we risk leaking information via timing side channel.
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Fixes: fdf7cb4185b6 ("mac80211: accept key reinstall without changing anything")
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Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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---
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net/mac80211/key.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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--- a/net/mac80211/key.c
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+++ b/net/mac80211/key.c
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@@ -19,6 +19,7 @@
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#include <linux/slab.h>
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#include <linux/export.h>
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#include <net/mac80211.h>
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+#include <crypto/algapi.h>
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#include <asm/unaligned.h>
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#include "ieee80211_i.h"
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#include "driver-ops.h"
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@@ -635,7 +636,7 @@ int ieee80211_key_link(struct ieee80211_
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* new version of the key to avoid nonce reuse or replay issues.
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*/
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if (old_key && key->conf.keylen == old_key->conf.keylen &&
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- !memcmp(key->conf.key, old_key->conf.key, key->conf.keylen)) {
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+ !crypto_memneq(key->conf.key, old_key->conf.key, key->conf.keylen)) {
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ieee80211_key_free_unused(key);
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ret = 0;
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goto out;
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