This is a note to let you know that I've just added the patch titled
mac80211: accept key reinstall without changing anything
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mac80211-accept-key-reinstall-without-changing-anything.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From fdf7cb4185b60c68e1a75e61691c4afdc15dea0e Mon Sep 17 00:00:00 2001
From: Johannes Berg <johannes.berg@xxxxxxxxx>
Date: Tue, 5 Sep 2017 14:54:54 +0200
Subject: mac80211: accept key reinstall without changing anything
From: Johannes Berg <johannes.berg@xxxxxxxxx>
commit fdf7cb4185b60c68e1a75e61691c4afdc15dea0e upstream.
When a key is reinstalled we can reset the replay counters
etc. which can lead to nonce reuse and/or replay detection
being impossible, breaking security properties, as described
in the "KRACK attacks".
In particular, CVE-2017-13080 applies to GTK rekeying that
happened in firmware while the host is in D3, with the second
part of the attack being done after the host wakes up. In
this case, the wpa_supplicant mitigation isn't sufficient
since wpa_supplicant doesn't know the GTK material.
In case this happens, simply silently accept the new key
coming from userspace but don't take any action on it since
it's the same key; this keeps the PN replay counters intact.
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Cc: Ben Hutchings <ben.hutchings@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/mac80211/key.c | 21 +++++++++++++++++----
1 file changed, 17 insertions(+), 4 deletions(-)
--- a/net/mac80211/key.c
+++ b/net/mac80211/key.c
@@ -4,7 +4,7 @@
* Copyright 2006-2007 Jiri Benc <jbenc@xxxxxxx>
* Copyright 2007-2008 Johannes Berg <johannes@xxxxxxxxxxxxxxxx>
* Copyright 2013-2014 Intel Mobile Communications GmbH
- * Copyright 2015 Intel Deutschland GmbH
+ * Copyright 2015-2017 Intel Deutschland GmbH
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -619,9 +619,6 @@ int ieee80211_key_link(struct ieee80211_
pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
idx = key->conf.keyidx;
- key->local = sdata->local;
- key->sdata = sdata;
- key->sta = sta;
mutex_lock(&sdata->local->key_mtx);
@@ -632,6 +629,21 @@ int ieee80211_key_link(struct ieee80211_
else
old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
+ /*
+ * Silently accept key re-installation without really installing the
+ * 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)) {
+ ieee80211_key_free_unused(key);
+ ret = 0;
+ goto out;
+ }
+
+ key->local = sdata->local;
+ key->sdata = sdata;
+ key->sta = sta;
+
increment_tailroom_need_count(sdata);
ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
@@ -647,6 +659,7 @@ int ieee80211_key_link(struct ieee80211_
ret = 0;
}
+ out:
mutex_unlock(&sdata->local->key_mtx);
return ret;
Patches currently in stable-queue which might be from johannes.berg@xxxxxxxxx are
queue-4.9/mac80211-use-constant-time-comparison-with-keys.patch
queue-4.9/mac80211-don-t-compare-tkip-tx-mic-key-in-reinstall-prevention.patch
queue-4.9/mac80211-accept-key-reinstall-without-changing-anything.patch