Date: Fri, 20 Apr 2012 09:14:58 +0400 From: Pavel Emelyanov <xemul@...allels.com> To: Eugene Teo <eugeneteo@...nel.sg> CC: "Eric W. Biederman" <ebiederm@...ssion.com>, Marcus Meissner <meissner@...e.de>, OSS Security List <oss-security@...ts.openwall.com>, "security@...nel.org" <security@...nel.org>, Sukadev Bhattiprolu <sukadev@...ibm.com>, Serge Hallyn <serge.hallyn@...onical.com> 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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