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

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Message-ID: <20151230012436.GA8173@gondor.apana.org.au>
Date:	Wed, 30 Dec 2015 09:24:36 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Dmitry Vyukov <dvyukov@...gle.com>
Cc:	"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 alg_bind

On Tue, Dec 29, 2015 at 09:19:22PM +0100, Dmitry Vyukov wrote:
> Hello,
> 
> On commit 8513342170278468bac126640a5d2d12ffbff106
> + crypto: algif_skcipher - Use new skcipher interface
> + crypto: algif_skcipher - Require setkey before accept(2)
> + crypto: af_alg - Disallow bind/setkey/... after accept(2)
> 
> The following program causes use-after-free in alg_bind and later
> terminates kernel:

Please double-check that you have the last patch applied correctly,
as I cannot reproduce the crash with your program.

Thanks,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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