netdev - Re: [PATCH] packet: fix potential use after free

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Date:	Sat, 12 Apr 2014 01:37:30 +0200
From:	Daniel Borkmann <dborkman@...hat.com>
To:	David Miller <davem@...emloft.net>
CC:	eric.dumazet@...il.com, netdev@...r.kernel.org, xii@...gle.com
Subject: Re: [PATCH] packet: fix potential use after free

On 04/11/2014 09:59 PM, David Miller wrote:
> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Thu, 10 Apr 2014 08:06:58 -0700
>
>> On Thu, 2014-04-10 at 10:19 +0200, Daniel Borkmann wrote:
>>> On 04/10/2014 03:22 AM, Eric Dumazet wrote:
>>>> From: Eric Dumazet <edumazet@...gle.com>
>>>>
>>>> As soon skb is queued into sk_receive_queue, it can be consumed,
>>>> so its racy to access skb->len.
>>>>
>>>> Given that sk_data_ready() / sock_def_readable() don't really care, just
>>>> use 0 instead of skb->len
>>>>
>>>> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
>>>> Cc: Xi Wang <xii@...gle.com>
>>>
>>> Acked-by: Daniel Borkmann <dborkman@...hat.com>
>>>
>>> Seems to be there since pre 2005 ...
>>
>> Yeah, and many other places have the same error, a full audit is
>> probably needed.
>
> Not only sock_def_readable(), but all implementations of this callback absolutely
> do not care about the length argument.
>
> I'm working on a patch to kill the argument completely.

Sounds good! Seen you've already pushed that, thanks!
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