bridge: Only call /sbin/bridge-stp for the initial network namespace
authorHannes Frederic Sowa <hannes@stressinduktion.org>
Tue, 5 Jan 2016 09:46:00 +0000 (10:46 +0100)
committerDavid S. Miller <davem@davemloft.net>
Tue, 5 Jan 2016 21:46:17 +0000 (16:46 -0500)
commitff62198553e43cdffa9d539f6165d3e83f8a42bc
tree12dd61853d73dcf5a457ed32b5d3c50f346f5544
parentc845acb324aa85a39650a14e7696982ceea75dc1
bridge: Only call /sbin/bridge-stp for the initial network namespace

[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>
net/bridge/br_stp_if.c