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

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Message-ID: <20140528182824.GA5057@cachalot>
Date:	Wed, 28 May 2014 22:28:24 +0400
From:	Vasily Kulikov <segoon@...nwall.com>
To:	Pavel Emelyanov <xemul@...allels.com>
Cc:	Chen Hanxiao <chenhanxiao@...fujitsu.com>,
	Richard Weinberger <richard.weinberger@...il.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

On Wed, May 28, 2014 at 16:44 +0400, Pavel Emelyanov wrote:
> On 05/28/2014 02:24 PM, Chen Hanxiao wrote:
> > We need a direct method of getting the pid inside containers.
> 
> But there's more generic issue -- some day we'll need to know not only
> PIDs as seen from different namespaces, but also SIDs and PGIDs.

Maybe include all per-ns ID in a separate file?  Then the old 'status'
file includes IDs from the current namespace only, the new file (e.g.
'ids' or 'ns_ids') contains only hierarchical IDs which differ from
namespace to namespace for all possible namespaces.  It will be simplier
to parse the file -- if 'ns_ids' file contains some ID then this ID for
every ns can be obtained regardless of the specific ID name (SID, PID,
PGID, etc.).

> 
> > If some issues occurred inside container guest, host user
> > could not know which process is in trouble just by guest pid:
> > the users of container guest only knew the pid inside containers.
> > This will bring obstacle for trouble shooting.
> > 
> > This patch adds two fields:
> > 
> > NStgid and NSpid.
> > 
> > a) In init_pid_ns, nothing changed;
> > 
> > b) In one pidns, will tell the pid inside containers:
> > NStgid:	1628 	9 	3
> > NSpid:	1628 	9 	3
> > ** Process id is 1628 in level 0, 9 in level 1, 3 in level 2.
> > 
> > c) If pidns is nested, it depends on which pidns are you in.
> > NStgid:	9 	3
> > NSpid:	9 	3
> > ** Views from level 1

Thanks,

-- 
Vasily Kulikov
http://www.openwall.com - bringing security into open computing environments
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