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https://github.com/Divested-Mobile/DivestOS-Build.git
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37 lines
1.3 KiB
Diff
37 lines
1.3 KiB
Diff
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From 706ccb5adc54e349c491ebeb462c121d6467c863 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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Change-Id: I9d6f1a4606312d3854746aa2eec2ec46d5629a2b
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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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diff --git a/net/mac80211/key.c b/net/mac80211/key.c
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index cebe30315d9..6d804cc2736 100644
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--- a/net/mac80211/key.c
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+++ b/net/mac80211/key.c
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@@ -18,6 +18,7 @@
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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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@@ -494,7 +495,7 @@ int ieee80211_key_link(struct ieee80211_key *key,
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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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