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authorHannes Frederic Sowa <hannes@stressinduktion.org>2016-01-05 12:46:00 +0300
committerDavid S. Miller <davem@davemloft.net>2016-01-06 00:46:17 +0300
commitff62198553e43cdffa9d539f6165d3e83f8a42bc (patch)
tree12dd61853d73dcf5a457ed32b5d3c50f346f5544 /net
parentc845acb324aa85a39650a14e7696982ceea75dc1 (diff)
downloadlinux-ff62198553e43cdffa9d539f6165d3e83f8a42bc.tar.xz
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>
Diffstat (limited to 'net')
-rw-r--r--net/bridge/br_stp_if.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/net/bridge/br_stp_if.c b/net/bridge/br_stp_if.c
index 12045dea276c..8a7ada8bb947 100644
--- a/net/bridge/br_stp_if.c
+++ b/net/bridge/br_stp_if.c
@@ -142,7 +142,10 @@ static void br_stp_start(struct net_bridge *br)
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);