linux-kernel - Re: [PATCH v2] /proc/pid/status: show all sets of pid according to ns

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Message-ID: <538709A5.60000@nod.at>
Date:	Thu, 29 May 2014 12:19:17 +0200
From:	Richard Weinberger <richard@....at>
To:	Pavel Emelyanov <xemul@...allels.com>
CC:	Vasily Kulikov <segoon@...nwall.com>,
	containers@...ts.linux-foundation.org,
	Serge Hallyn <serge.hallyn@...ntu.com>,
	linux-kernel@...r.kernel.org, Oleg Nesterov <oleg@...hat.com>,
	David Howells <dhowells@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH v2] /proc/pid/status: show all sets of pid according to
 ns

Am 29.05.2014 12:02, schrieb Pavel Emelyanov:
>>> We need to know what pid namespaces a task lives in and how pid, sid and
>>> pgid look in all of them. A short example with pids only
>>
>> So use case is to checkpoint/restore nested containers? :)
> 
> Yes, but there's one more scenario. AFAIK some applications create pid namespaces 
> themselves, without starting what is typically called "a container" :) And when 
> such an applications are run inside, well ... "more real" container (e.g. using
> openvz, lxc or docker tools) we face this issue.

Do you know such an application?
I'm a aware of systemd which uses CLONE_NEWNET/NS to implement security features.

We could add a directory like /proc/<pidX>/ns/proc/ which would contain everything
from /proc/<pidX inside the namespace>/.

This needs definitely more discussion and must not solved by ad-hoc solutions.

Thanks,
//richard
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