linux-kernel - Re: [PATCH][BUGFIX] cgroups: fix pid namespace bug

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Message-ID: <6599ad830907020946r42735c9es642bddf37af755ed@mail.gmail.com>
Date:	Thu, 2 Jul 2009 09:46:51 -0700
From:	Paul Menage <menage@...gle.com>
To:	"Serge E. Hallyn" <serue@...ibm.com>
Cc:	Li Zefan <lizf@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux Containers <containers@...ts.linux-foundation.org>
Subject: Re: [PATCH][BUGFIX] cgroups: fix pid namespace bug

On Thu, Jul 2, 2009 at 9:37 AM, Serge E. Hallyn<serue@...ibm.com> wrote:
>
>        1. the only way it won't outlive the open file is if the
>                task opens the file, hands the open fd over a
>                unix socket, then exits as the last task of its
>                pidns

Right.

>        2. We don't dereference the pid_ns, so there is no actual
>                safety issue.  So it would become a problem only
>                if a new pidns gets created at that same address

Which is fairly likely given that pid_namespace is allocated from a
specific cache.

Paul
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