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Date: Fri, 20 Apr 2012 00:14:14 -0700
From: (Eric W. Biederman)
To: Eugene Teo <>
Cc: Marcus Meissner <>,  OSS Security List <>,,  Sukadev Bhattiprolu <>,  Serge Hallyn <>,  Pavel Emelyanov <>
Subject: Re: CVE request: pid namespace leak in kernel 3.0 and 3.1

Eugene Teo <> writes:

>> 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.

Hmm.  The zombies are reaped? 

I am scratching my head perhaps because I am looking at the current code
but I don't seem to see how a task that pins a pid can get past
release_task (the zombie reaper) and in particular past in release
__exit_signal() which calls unhash_process().

The simple test to see if we have made it past unhash_process is to see
if you can see the zombie processes.

> I'm helping to provide more information.

You are.  Thank you for looking to see what the symptoms are.


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