This is a note to let you know that I've just added the patch titled
nl80211: check netlink protocol in socket release notification
to the 3.14-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:
nl80211-check-netlink-protocol-in-socket-release-notification.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8f815cdde3e550e10c2736990d791f60c2ce43eb Mon Sep 17 00:00:00 2001
From: Dmitry Ivanov <dmitrijs.ivanovs@xxxxxxxx>
Date: Wed, 6 Apr 2016 17:23:18 +0300
Subject: nl80211: check netlink protocol in socket release notification
From: Dmitry Ivanov <dmitrijs.ivanovs@xxxxxxxx>
commit 8f815cdde3e550e10c2736990d791f60c2ce43eb upstream.
A non-privileged user can create a netlink socket with the same port_id as
used by an existing open nl80211 netlink socket (e.g. as used by a hostapd
process) with a different protocol number.
Closing this socket will then lead to the notification going to nl80211's
socket release notification handler, and possibly cause an action such as
removing a virtual interface.
Fix this issue by checking that the netlink protocol is NETLINK_GENERIC.
Since generic netlink has no notifier chain of its own, we can't fix the
problem more generically.
Fixes: 026331c4d9b5 ("cfg80211/mac80211: allow registering for and sending action frames")
Signed-off-by: Dmitry Ivanov <dima@xxxxxxxx>
[rewrite commit message]
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/wireless/nl80211.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -11522,7 +11522,7 @@ static int nl80211_netlink_notify(struct
struct wireless_dev *wdev;
struct cfg80211_beacon_registration *reg, *tmp;
- if (state != NETLINK_URELEASE)
+ if (state != NETLINK_URELEASE || notify->protocol != NETLINK_GENERIC)
return NOTIFY_DONE;
rcu_read_lock();
Patches currently in stable-queue which might be from dmitrijs.ivanovs@xxxxxxxx are
queue-3.14/nl80211-check-netlink-protocol-in-socket-release-notification.patch
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