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bridge: Only call /sbin/bridge-stp for the initial network namespace 

[ 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>
This commit is contained in:
Hannes Frederic Sowa 2016-01-05 10:46:00 +01:00 committed by Greg Kroah-Hartman
parent df87da0783
commit a15061500d
1 changed files with 4 additions and 1 deletions
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5
net/bridge/br_stp_if.c
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@ -128,7 +128,10 @@ static void br_stp_start(struct net_bridge *br)
char *argv[] = { BR_STP_PROG, br->dev->name, "start", NULL };
char *envp[] = { NULL };
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);