Messages in this thread Patch in this message | | | From | Jason Wang <> | Subject | [PATCH net-next rfc 1/2] tuntap: forbid calling TUNSETQUEUE for a persistent device with no queues | Date | Tue, 11 Dec 2012 19:03:46 +0800 |
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When re-establish to a persistent deivce wihout queues attached, TUNSETIFF should be called instead of TUNSETQUEUE to do the proper permission checking.
Signed-off-by: Jason Wang <jasowang@redhat.com> --- drivers/net/tun.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/drivers/net/tun.c b/drivers/net/tun.c index 14a0454..d593f56 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -1771,6 +1771,9 @@ static int tun_set_queue(struct file *file, struct ifreq *ifr) ret = -EINVAL; else if (tun_not_capable(tun)) ret = -EPERM; + /* TUNSETIFF is needed to do permission checking */ + else if (tun->numqueues == 0) + ret = -EPERM; else ret = tun_attach(tun, file); } else if (ifr->ifr_flags & IFF_DETACH_QUEUE) -- 1.7.1
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