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Message-ID: <52712DC8.1070502@redhat.com>
Date: Wed, 30 Oct 2013 10:03:20 -0600
From: Kurt Seifried <kseifried@...hat.com>
To: oss-security@...ts.openwall.com, vdavydov@...allels.com,
khorenko@...allels.com, vvs@...allels.com
Subject: Re: CVE Request -- Linux kernel: ipc: ipc_rcu_putref
refcount races
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
On 10/30/2013 08:52 AM, Petr Matousek wrote:
> A flaw was found in the way ipc_rcu_putref() function handled
> reference counter decrementing. Without external synchronization
> reference counter might not be adjusted properly, as presented with
> the freeque() vs do_msgsnd() race, leading to memory leaks.
>
> An unprivileged local user could use this flaw to cause OOM
> conditions, potentially crashing the system.
>
> References: https://bugzilla.redhat.com/show_bug.cgi?id=1024854
> https://wiki.openvz.org/Download/kernel/rhel6-testing/042stab084.3
>
> Upstream patch:
> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6062a8
>
>
(making the refcounter atomic hunks)
>
> Acknowledgements:
>
> Red Hat would like to thank Vladimir Davydov (Parallels) for
> reporting this issue.
>
> Thanks,
Please use CVE-2013-4483 for this issue.
- --
Kurt Seifried Red Hat Security Response Team (SRT)
PGP: 0x5E267993 A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993
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