From bad2929733635f80f99930b252757c70372356fe Mon Sep 17 00:00:00 2001
From: Andrew Zaborowski <andrew.zaborowski@intel.com>
Date: Tue, 22 May 2018 02:46:02 +0200
Subject: [PATCH] nl80211: Reject disconnect commands except from conn_owner
Git-commit: bad2929733635f80f99930b252757c70372356fe
Patch-mainline: v4.18-rc1
References: FATE#326294
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>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
net/wireless/nl80211.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
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
--
2.19.2