From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:42851 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752227AbcA0Gdq (ORCPT ); Wed, 27 Jan 2016 01:33:46 -0500 Subject: Patch "bridge: Only call /sbin/bridge-stp for the initial network namespace" has been added to the 4.3-stable tree To: hannes@stressinduktion.org, davem@davemloft.net, ebiederm@xmission.com, gregkh@linuxfoundation.org Cc: , From: Date: Tue, 26 Jan 2016 22:29:06 -0800 Message-ID: <145387614624136@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled bridge: Only call /sbin/bridge-stp for the initial network namespace to the 4.3-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: bridge-only-call-sbin-bridge-stp-for-the-initial-network-namespace.patch and it can be found in the queue-4.3 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From foo@baz Tue Jan 26 21:35:03 PST 2016 From: Hannes Frederic Sowa Date: Tue, 5 Jan 2016 10:46:00 +0100 Subject: bridge: Only call /sbin/bridge-stp for the initial network namespace From: Hannes Frederic Sowa [ Upstream commit ff62198553e43cdffa9d539f6165d3e83f8a42bc ] [I stole this patch from Eric Biederman. He wrote:] > There is no defined mechanism to pass network namespace information > into /sbin/bridge-stp therefore don't even try to invoke it except > for bridge devices in the initial network namespace. > > It is possible for unprivileged users to cause /sbin/bridge-stp to be > invoked for any network device name which if /sbin/bridge-stp does not > guard against unreasonable arguments or being invoked twice on the > same network device could cause problems. [Hannes: changed patch using netns_eq] Cc: Eric W. Biederman Signed-off-by: Eric W. Biederman Signed-off-by: Hannes Frederic Sowa Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/bridge/br_stp_if.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) --- a/net/bridge/br_stp_if.c +++ b/net/bridge/br_stp_if.c @@ -130,7 +130,10 @@ static void br_stp_start(struct net_brid char *envp[] = { NULL }; struct net_bridge_port *p; - r = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC); + if (net_eq(dev_net(br->dev), &init_net)) + r = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC); + else + r = -ENOENT; spin_lock_bh(&br->lock); Patches currently in stable-queue which might be from hannes@stressinduktion.org are queue-4.3/bridge-only-call-sbin-bridge-stp-for-the-initial-network-namespace.patch queue-4.3/udp-disallow-ufo-for-sockets-with-so_no_check-option.patch queue-4.3/unix-properly-account-for-fds-passed-over-unix-sockets.patch queue-4.3/addrconf-always-initialize-sysctl-table-data.patch