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Date: Fri, 20 Apr 2012 09:14:58 +0400
From: Pavel Emelyanov <>
To: Eugene Teo <>
CC: "Eric W. Biederman" <>,
        Marcus Meissner <>,
        OSS Security List <>,
        "" <>,
        Sukadev Bhattiprolu <>,
        Serge Hallyn <>
Subject: Re: CVE request: pid namespace leak in kernel 3.0 and 3.1

On 04/20/2012 07:10 AM, Eugene Teo wrote:
>> So we know what is holding the pid namespace reference.
>> Additional thoughts.
>> Does echo 3 > /proc/sys/vm/drop_caches clear up the issue?
> No.
>> Is there a corresponding task_struct leak?
> Yes.
>> I don't have much of a clue or much concern as this seems fixed in later kernels but I am happy to suggest things to look for to help narrow this down.
> I'm helping to provide more information.

Is there also a vfsmount struct leak as well? The pidns creating implies
kern-mount-ing of a proc and it should be released when child reaper of
the namespace dies.

> Thanks, Eugene
> .

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