netdev - Re: [PATCH net] packet: fix use after free race in send path when dev is released

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Message-Id: <20131120.152120.518403007474992157.davem@davemloft.net>
Date:	Wed, 20 Nov 2013 15:21:20 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	dborkman@...hat.com, netdev@...r.kernel.org,
	noureddine@...stanetworks.com, greearb@...delatech.com
Subject: Re: [PATCH net] packet: fix use after free race in send path when
 dev is released

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 20 Nov 2013 12:15:59 -0800

> On Wed, 2013-11-20 at 15:07 -0500, David Miller wrote:
>> From: Daniel Borkmann <dborkman@...hat.com>
> 
>> > Yep, will try if this approach works, in other words doing the earlier
>> > exit via !po->running, plus deferring the dev_put() et al to RCU.
>> 
>> Thank you.  You might have to wrap the sendmsg path in an rcu lock
>> sequence.
> 
> Note that dev_put() / dev_hold() are blazingly fast ;)

Oh yes, per-cpu counters, almost forgot :-)))
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