linux-kernel - Re: crypto: use-after-free in rng

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Message-ID: <1770781.3L9ebnaMWA@myon.chronox.de>
Date:	Wed, 30 Dec 2015 21:54:09 +0100
From:	Stephan Mueller <smueller@...onox.de>
To:	Dmitry Vyukov <dvyukov@...gle.com>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	linux-crypto@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	syzkaller <syzkaller@...glegroups.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Eric Dumazet <edumazet@...gle.com>
Subject: Re: crypto: use-after-free in rng_recvmsg

Am Montag, 28. Dezember 2015, 14:48:48 schrieb Dmitry Vyukov:

Hi Dmitry,

> Hello,
> 
> On commit a88164345b81292b55a8d4829fdd35c8d611cd7d (Dec 23)
> + crypto: algif_skcipher - Use new skcipher interface
> + crypto: algif_skcipher - Require setkey before accept(2)
> 
> The following program triggers use-after-free in rng_recvmsg:

Thank you for the bug report.

After applying the patch from Herbert [1], I was not able to reproduce the 
issue even after 1000 rounds of the test code. Considering the issue and the 
patch from Herbert, I would consider the issue being fixed.

[1] http://www.mail-archive.com/linux-crypto@vger.kernel.org/msg17450.html

Thank you.
-- 
Ciao
Stephan
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