linux-kernel - Re: panic in skb

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Message-ID: <547CBE0D.8010501@redhat.com>
Date:	Mon, 01 Dec 2014 20:14:21 +0100
From:	Daniel Borkmann <dborkman@...hat.com>
To:	Robert Święcki <robert@...ecki.net>
CC:	linux-sctp@...r.kernel.org, linux-kernel@...r.kernel.org,
	vyasevich@...il.com
Subject: Re: panic in skb_push via sctp

On 12/01/2014 08:00 PM, Robert Święcki wrote:
> 2014-12-01 19:08 GMT+01:00 Daniel Borkmann <dborkman@...hat.com>:
>>
>>> Thanks for looking into it. I can try with your patch, but no
>>> guarantees that the fuzzer will hit the same condition in some
>>> reasonable time-frame. Will get back in some time with results.
>>
>> Ok, thanks!
>>
>>> PS. If you think it's possible to create a repro (userland code) which
>>> can trigger this, I can give it a try.
>>
>> Did by accident trinity create tunnels? It looks that upper layer
>> protocols (except SCTP) all allocate and reserve MAX_HEADER to
>> accommodate enough head room in worst case for possible tunnels.
>
> Not sure, but I run it inside a pid/ipc/uts/etc/user-namespaces where
> it operates with a full set of capabilities, so most of the SOCK_RAW
> and tunnel-like-creating calls succeed, so maybe..

Ok thanks, can you post your .config?
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