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Date: Tue, 17 Jan 2017 20:25:19 +0530
From: Lokesh Ubuntu <lokesh.ubuntu@...il.com>
To: oss-security@...ts.openwall.com
Subject: Re: CVE request -- linux kernel: crash by spawning
mcrypt(alg) with incompatible algorithm
Do we have CVE for this? If not so why don't we have one? Thanks!
Regards, Lokesh
On Jan 17, 2017 19:51, "Vladis Dronov" <vdronov@...hat.com> wrote:
> Hello,
>
> Algorithms not compatible with mcryptd could be spawned by mcryptd with a
> direct
> crypto_alloc_tfm invocation using a "mcryptd(alg)" name construct. This
> causes
> mcryptd to crash the kernel if an arbitrary "alg" is incompatible and not
> intended
> to be used with mcryptd.
>
> This could be a potential attack to crash the kernel by user program using
> AF_ALG
> to request an invalid algorithm such as mcryptd(md5).
>
> Initial discussion:
>
> https://marc.info/?l=dm-devel&m=148063708010538&w=2
>
> Suggested Patch:
>
> http://marc.info/?l=linux-crypto-vger&m=148096718218312&w=2
>
> Upstream patch:
>
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/
> linux.git/commit/?id=48a992727d82cb7db076fa15d372178743b1f4cd
>
> Red Hat Product Security Bugzilla:
>
> https://bugzilla.redhat.com/show_bug.cgi?id=1404200
>
> Best regards,
> Vladis Dronov | Red Hat, Inc. | Product Security Engineer
>
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