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Date: Fri, 20 Apr 2012 08:59:03 +0800
From: Eugene Teo <>
To: Marcus Meissner <>
Cc: OSS Security List <>,, 
	Sukadev Bhattiprolu <>, Serge Hallyn <>, 
	"Eric W. Biederman" <>, Pavel Emelyanov <>
Subject: Re: CVE request: pid namespace leak in kernel 3.0 and 3.1

On Fri, Apr 20, 2012 at 5:48 AM, Marcus Meissner <> wrote:
> we had a user, Vadim Ponomarev (ccrssaa at,  report a pid
> namespace leak caused by vsftpd.
> He provided a simple reproducer:
> and checking "cat /proc/slabinfo|grep pid_namespace"
> gives 10000 more active slots after running it on 3.0.13 (+SUSE patches) and 3.1.10 (+SUSE patches).
> Running this on 3.2.0 (+SUSE Patches) did not result in more slots, so it was probably
> fixed between 3.1 and 3.2 (but someone else cross check perhaps).
> Any idea welcome on which patch fixed this, I tried 1b26c9b334044cff6d1d2698f2be41bc7d9a0864
> but it seems not helping.

I tested this with 3.0.25-rt44.57.el6rt.x86_64 yesterday, and I was
able to trigger the issue. The process needs to be privileged with

Eric, besides struct pid_namespace, there is a corresponding struct pid_2 leak.

Thanks, Eugene

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