diff options
Diffstat (limited to 'package/kernel/mac80211/patches/329-mac80211-don-t-compare-TKIP-TX-MIC-key-in-reinstall.patch')
| -rw-r--r-- | package/kernel/mac80211/patches/329-mac80211-don-t-compare-TKIP-TX-MIC-key-in-reinstall.patch | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/329-mac80211-don-t-compare-TKIP-TX-MIC-key-in-reinstall.patch b/package/kernel/mac80211/patches/329-mac80211-don-t-compare-TKIP-TX-MIC-key-in-reinstall.patch new file mode 100644 index 0000000000..1eaf51de72 --- /dev/null +++ b/package/kernel/mac80211/patches/329-mac80211-don-t-compare-TKIP-TX-MIC-key-in-reinstall.patch @@ -0,0 +1,73 @@ +From cfbb0d90a7abb289edc91833d0905931f8805f12 Mon Sep 17 00:00:00 2001 +From: Johannes Berg <johannes.berg@intel.com> +Date: Tue, 24 Oct 2017 21:12:13 +0200 +Subject: [PATCH] mac80211: don't compare TKIP TX MIC key in reinstall prevention + +For the reinstall prevention, the code I had added compares the +whole key. It turns out though that iwlwifi firmware doesn't +provide the TKIP TX MIC key as it's not needed in client mode, +and thus the comparison will always return false. + +For client mode, thus always zero out the TX MIC key part before +doing the comparison in order to avoid accepting the reinstall +of the key with identical encryption and RX MIC key, but not the +same TX MIC key (since the supplicant provides the real one.) + +Fixes: fdf7cb4185b6 ("mac80211: accept key reinstall without changing anything") +Signed-off-by: Johannes Berg <johannes.berg@intel.com> +--- + net/mac80211/key.c | 36 ++++++++++++++++++++++++++++++++++-- + 1 file changed, 34 insertions(+), 2 deletions(-) + +--- a/net/mac80211/key.c ++++ b/net/mac80211/key.c +@@ -610,6 +610,39 @@ void ieee80211_key_free_unused(struct ie + ieee80211_key_free_common(key); + } + ++static bool ieee80211_key_identical(struct ieee80211_sub_if_data *sdata, ++ struct ieee80211_key *old, ++ struct ieee80211_key *new) ++{ ++ u8 tkip_old[WLAN_KEY_LEN_TKIP], tkip_new[WLAN_KEY_LEN_TKIP]; ++ u8 *tk_old, *tk_new; ++ ++ if (!old || new->conf.keylen != old->conf.keylen) ++ return false; ++ ++ tk_old = old->conf.key; ++ tk_new = new->conf.key; ++ ++ /* ++ * In station mode, don't compare the TX MIC key, as it's never used ++ * and offloaded rekeying may not care to send it to the host. This ++ * is the case in iwlwifi, for example. ++ */ ++ if (sdata->vif.type == NL80211_IFTYPE_STATION && ++ new->conf.cipher == WLAN_CIPHER_SUITE_TKIP && ++ new->conf.keylen == WLAN_KEY_LEN_TKIP && ++ !(new->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) { ++ memcpy(tkip_old, tk_old, WLAN_KEY_LEN_TKIP); ++ memcpy(tkip_new, tk_new, WLAN_KEY_LEN_TKIP); ++ memset(tkip_old + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8); ++ memset(tkip_new + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8); ++ tk_old = tkip_old; ++ tk_new = tkip_new; ++ } ++ ++ return !crypto_memneq(tk_old, tk_new, new->conf.keylen); ++} ++ + int ieee80211_key_link(struct ieee80211_key *key, + struct ieee80211_sub_if_data *sdata, + struct sta_info *sta) +@@ -635,8 +668,7 @@ int ieee80211_key_link(struct ieee80211_ + * 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 && +- !crypto_memneq(key->conf.key, old_key->conf.key, key->conf.keylen)) { ++ if (ieee80211_key_identical(sdata, old_key, key)) { + ieee80211_key_free_unused(key); + ret = 0; + goto out; |