oss-security - Re: CVE request: pid namespace leak in kernel 3.0 and 3.1

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Message-ID: <CAGyNYUOr=4kSTDL4gs9PXMffJ81a-=Tkx9tMhr-CAt2JQUKw0w@mail.gmail.com>
Date: Fri, 20 Apr 2012 11:10:10 +0800
From: Eugene Teo <eugeneteo@...nel.sg>
To: "Eric W. Biederman" <ebiederm@...ssion.com>
Cc: Marcus Meissner <meissner@...e.de>, OSS Security List <oss-security@...ts.openwall.com>, 
	security@...nel.org, Sukadev Bhattiprolu <sukadev@...ibm.com>, 
	Serge Hallyn <serge.hallyn@...onical.com>, Pavel Emelyanov <xemul@...nvz.org>
Subject: Re: CVE request: pid namespace leak in kernel 3.0 and 3.1

> 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.

Thanks, Eugene

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