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authorAndrew Zaborowski <andrew.zaborowski@intel.com>2018-05-22 02:46:02 +0200
committerJohannes Berg <johannes.berg@intel.com>2018-05-23 11:56:26 +0200
commitbad2929733635f80f99930b252757c70372356fe (patch)
tree34bbc339721e33ed796b4bb9f636ede2da2ff20e /net/wireless
parent232aa23ec354029a58280e79d815ee4746c0bbb2 (diff)
nl80211: Reject disconnect commands except from conn_owner
Reject NL80211_CMD_DISCONNECT, NL80211_CMD_DISASSOCIATE, NL80211_CMD_DEAUTHENTICATE and NL80211_CMD_ASSOCIATE commands from clients other than the connection owner set in the connect, authenticate or associate commands, if it was set. The main point of this check is to prevent chaos when two processes try to use nl80211 at the same time, it's not a security measure. The same thing should possibly be done for JOIN_IBSS/LEAVE_IBSS and START_AP/STOP_AP. Signed-off-by: Andrew Zaborowski <andrew.zaborowski@intel.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/wireless')
-rw-r--r--net/wireless/nl80211.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index bdf73b24cc09..bc40a783cb27 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -8514,6 +8514,10 @@ static int nl80211_associate(struct sk_buff *skb, struct genl_info *info)
const u8 *bssid, *ssid;
int err, ssid_len = 0;
+ if (dev->ieee80211_ptr->conn_owner_nlportid &&
+ dev->ieee80211_ptr->conn_owner_nlportid != info->snd_portid)
+ return -EPERM;
+
if (!is_valid_ie_attr(info->attrs[NL80211_ATTR_IE]))
return -EINVAL;
@@ -8636,6 +8640,10 @@ static int nl80211_deauthenticate(struct sk_buff *skb, struct genl_info *info)
u16 reason_code;
bool local_state_change;
+ if (dev->ieee80211_ptr->conn_owner_nlportid &&
+ dev->ieee80211_ptr->conn_owner_nlportid != info->snd_portid)
+ return -EPERM;
+
if (!is_valid_ie_attr(info->attrs[NL80211_ATTR_IE]))
return -EINVAL;
@@ -8683,6 +8691,10 @@ static int nl80211_disassociate(struct sk_buff *skb, struct genl_info *info)
u16 reason_code;
bool local_state_change;
+ if (dev->ieee80211_ptr->conn_owner_nlportid &&
+ dev->ieee80211_ptr->conn_owner_nlportid != info->snd_portid)
+ return -EPERM;
+
if (!is_valid_ie_attr(info->attrs[NL80211_ATTR_IE]))
return -EINVAL;
@@ -9512,6 +9524,10 @@ static int nl80211_disconnect(struct sk_buff *skb, struct genl_info *info)
u16 reason;
int ret;
+ if (dev->ieee80211_ptr->conn_owner_nlportid &&
+ dev->ieee80211_ptr->conn_owner_nlportid != info->snd_portid)
+ return -EPERM;
+
if (!info->attrs[NL80211_ATTR_REASON_CODE])
reason = WLAN_REASON_DEAUTH_LEAVING;
else