releases/4.3.5/bridge-only-call-sbin-bridge-stp-for-the-initial-network-namespace.patch

From foo@baz Tue Jan 26 21:35:03 PST 2016
From: Hannes Frederic Sowa <hannes@stressinduktion.org>
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 <hannes@stressinduktion.org>

[ 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 <ebiederm@xmission.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 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);