linux-kernel - Re: panic in skb

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Message-ID: <CAP145pici-xNuvyhdyRdSok_p_1KXvuNKeceMcdaWdEw8VOBuQ@mail.gmail.com>
Date:	Mon, 1 Dec 2014 20:00:15 +0100
From:	Robert Święcki <robert@...ecki.net>
To:	Daniel Borkmann <dborkman@...hat.com>
Cc:	linux-sctp@...r.kernel.org, linux-kernel@...r.kernel.org,
	vyasevich@...il.com
Subject: Re: panic in skb_push via sctp

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..

-- 
Robert Święcki
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