提交 6e331f4c 编写于 作者: S Stefan Hajnoczi 提交者: David S. Miller

tuntap: refuse to re-attach to different tun_struct

Multiqueue tun devices support detaching a tun_file from its tun_struct
and re-attaching at a later point in time.  This allows users to disable
a specific queue temporarily.

ioctl(TUNSETIFF) allows the user to specify the network interface to
attach by name.  This means the user can attempt to attach to interface
"B" after detaching from interface "A".

The driver is not designed to support this so check we are re-attaching
to the right tun_struct.  Failure to do so may lead to oops.
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
Acked-by: NJason Wang <jasowang@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 21caa662
......@@ -491,6 +491,8 @@ static int tun_attach(struct tun_struct *tun, struct file *file)
err = -EINVAL;
if (rcu_dereference_protected(tfile->tun, lockdep_rtnl_is_held()))
goto out;
if (tfile->detached && tun != tfile->detached)
goto out;
err = -EBUSY;
if (!(tun->flags & TUN_TAP_MQ) && tun->numqueues == 1)
......
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