mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
synced 2024-12-12 01:14:22 -05:00
79 lines
2.7 KiB
Diff
79 lines
2.7 KiB
Diff
From 6bd7e74005e90ef79402a9c94e1044f845aa49f1 Mon Sep 17 00:00:00 2001
|
|
From: Johannes Berg <johannes.berg@intel.com>
|
|
Date: Tue, 5 Sep 2017 14:54:54 +0200
|
|
Subject: [PATCH] mac80211: accept key reinstall without changing anything
|
|
|
|
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.
|
|
|
|
Change-Id: If973789c12d2afcd9192f796e27bc9598c5dd1c0
|
|
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
|
|
---
|
|
net/mac80211/key.c | 20 +++++++++++++++++---
|
|
1 file changed, 17 insertions(+), 3 deletions(-)
|
|
|
|
diff --git a/net/mac80211/key.c b/net/mac80211/key.c
|
|
index 5bb600d93d7..cebe30315d9 100644
|
|
--- a/net/mac80211/key.c
|
|
+++ b/net/mac80211/key.c
|
|
@@ -3,6 +3,7 @@
|
|
* Copyright 2005-2006, Devicescape Software, Inc.
|
|
* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
|
|
* Copyright 2007-2008 Johannes Berg <johannes@sipsolutions.net>
|
|
+ * 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
|
|
@@ -452,9 +453,6 @@ int ieee80211_key_link(struct ieee80211_key *key,
|
|
|
|
pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
|
|
idx = key->conf.keyidx;
|
|
- key->local = sdata->local;
|
|
- key->sdata = sdata;
|
|
- key->sta = sta;
|
|
|
|
if (sta) {
|
|
/*
|
|
@@ -491,6 +489,21 @@ int ieee80211_key_link(struct ieee80211_key *key,
|
|
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);
|
|
@@ -500,6 +513,7 @@ int ieee80211_key_link(struct ieee80211_key *key,
|
|
|
|
ret = ieee80211_key_enable_hw_accel(key);
|
|
|
|
+ out:
|
|
mutex_unlock(&sdata->local->key_mtx);
|
|
|
|
return ret;
|