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

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Message-ID: <20140529055954.GA10354@cachalot>
Date:	Thu, 29 May 2014 09:59:54 +0400
From:	Vasily Kulikov <segoon@...nwall.com>
To:	Pavel Emelyanov <xemul@...allels.com>
Cc:	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 23:27 +0400, Pavel Emelyanov wrote:
> On 05/28/2014 10:28 PM, Vasily Kulikov wrote:
> > On Wed, May 28, 2014 at 16:44 +0400, Pavel Emelyanov wrote:
> > 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.).
> 
> True, but given a task PID how to determine which pid namespaces it lives in
> to get the idea of how PIDs map to each other? Maybe we need some explicit
> API for converting (ID, NS1, NS2) into (ID)?

AFAIU the idea of the patch is to add a new debugging information which
can be trivially obtained via 'cat /proc/...':

] We need a direct method of getting the pid inside containers.
] 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.

A new syscall might complicate trouble shooting by admin.

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