netdev - Re: Potential out-of-bounds access in ip6_finish

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Date:	Wed, 18 Sep 2013 00:48:51 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Dmitry Vyukov <dvyukov@...gle.com>
Cc:	yoshfuji@...ux-ipv6.org, netdev@...r.kernel.org,
	Paul Turner <pjt@...gle.com>,
	Andrey Konovalov <andreyknvl@...gle.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Tom Herbert <therbert@...gle.com>
Subject: Re: Potential out-of-bounds access in ip6_finish_output2

On Mon, Sep 16, 2013 at 10:13:10PM -0700, Dmitry Vyukov wrote:
> Hi,
> 
> I am working on AddressSanitizer -- a tool that detects use-after-free
> and out-of-bounds bugs
> (https://code.google.com/p/address-sanitizer/wiki/AddressSanitizerForKernel).
> 
> I've got a dozen of reports in ip6_finish_output2. Below are 2 of
> them. They are always followed by kernel crash. Unfortunately I don't
> have a reproducer because I am using trinity fuzzer. I would
> appreciate if somebody familiar with the code look at sources and
> maybe spot the bug.

Thanks for the report!

I tried reproducing the bug and hit some other bugs nearby. I'll try to fix
them, but this could take some time.

Greetings,

  Hannes

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