linux-kernel - Re: [PATCH net-next v3 0/3] net: ipvlan: fix potential UAF problem for phy

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Date:   Tue, 22 Mar 2022 10:15:21 +0100
From:   Paolo Abeni <pabeni@...hat.com>
To:     Ziyang Xuan <william.xuanziyang@...wei.com>, davem@...emloft.net,
        kuba@...nel.org, netdev@...r.kernel.org
Cc:     edumazet@...gle.com, brianvv@...gle.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v3 0/3] net: ipvlan: fix potential UAF problem
 for phy_dev

Hello,

On Sat, 2022-03-19 at 17:52 +0800, Ziyang Xuan wrote:
> There is a known scenario can trigger UAF problem for lower
> netdevice as following:
> 
> Someone module puts the NETDEV_UNREGISTER event handler to a
> work, and lower netdevice is accessed in the work handler. But
> when the work is excuted, lower netdevice has been destroyed
> because upper netdevice did not get reference to lower netdevice
> correctly.
> 
> Although it can not happen for ipvlan now because there is no
> way to access phy_dev outside ipvlan. But it is necessary to
> add the reference operation to phy_dev to avoid the potential
> UAF problem in the future.
> 
> In addition, add net device refcount tracker to ipvlan and
> fix some error comments for ipvtap module.

This is pure net-next material, and we are now into the merge window -
only fixes allowed. Please repost in 2w, thanks!

Paolo