netdev - Re: [PATCH 3.8-rc] tuntap: refuse to re-attach to different tun

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Message-Id: <20130110.143902.2166041015759450388.davem@davemloft.net>
Date:	Thu, 10 Jan 2013 14:39:02 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	stefanha@...hat.com
Cc:	jasowang@...hat.com, mst@...hat.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3.8-rc] tuntap: refuse to re-attach to different
 tun_struct

From: Stefan Hajnoczi <stefanha@...hat.com>
Date: Thu, 10 Jan 2013 08:59:48 +0100

> 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: Stefan Hajnoczi <stefanha@...hat.com>

Applied.
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