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| author | Eric W. Biederman <ebiederm@xmission.com> | 2012-11-18 21:34:11 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-11-19 14:15:54 -0500 |
| commit | c260b7722f8c21963d0f0347f7fc203da9ee1a6b (patch) | |
| tree | 8d42f13a5cedbcd5d442d6f02e132f9a65372e7a | |
| parent | 3594698a1fb8e5ae60a92c72ce9ca280256939a7 (diff) | |
| download | linux-c260b7722f8c21963d0f0347f7fc203da9ee1a6b.tar.gz | |
net: Allow userns root to control tun and tap devices
Allow an unpriviled user who has created a user namespace, and then created a network namespace to effectively use the new network namespace, by reducing capable(CAP_NET_ADMIN) calls to ns_capable(net->user_ns,CAP_NET_ADMIN) calls. Allow setting of the tun iff flags. Allow creating of tun devices. Allow adding a new queue to a tun device. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Acked-by: Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/tun.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c index b44d7b79cddc..b01e8c0c422b 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -373,10 +373,11 @@ static u16 tun_select_queue(struct net_device *dev, struct sk_buff *skb) static inline bool tun_not_capable(struct tun_struct *tun) { const struct cred *cred = current_cred(); + struct net *net = dev_net(tun->dev); return ((uid_valid(tun->owner) && !uid_eq(cred->euid, tun->owner)) || (gid_valid(tun->group) && !in_egroup_p(tun->group))) && - !capable(CAP_NET_ADMIN); + !ns_capable(net->user_ns, CAP_NET_ADMIN); } static void tun_set_real_num_queues(struct tun_struct *tun) @@ -1559,7 +1560,7 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) char *name; unsigned long flags = 0; - if (!capable(CAP_NET_ADMIN)) + if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) return -EPERM; err = security_tun_dev_create(); if (err < 0) |