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

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Date:	Mon, 26 May 2014 22:04:43 +0400
From:	Vasily Kulikov <segooon@...il.com>
To:	Chen Hanxiao <chenhanxiao@...fujitsu.com>
Cc:	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org,
	Serge Hallyn <serge.hallyn@...ntu.com>,
	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] /proc/pid/status: show all sets of pid according to ns

Hi Chen,

On Mon, May 26, 2014 at 18:05 +0800, Chen Hanxiao wrote:
> We need a direct method of getting the pid inside containers.
> If some issues occurred inside a 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 expands fields of Tgid and Pid:
> a) In init_pid_ns, nothing changed;
> 
> b) In one pidns, they will tell the pid inside containers:
> Tgid:	1628 	9 	3
> Pid:	1628 	9 	3
> ** process id is 1628 in level 0, 9 in level 1, 3 in level 2.

1. It breaks ABI.  Any application which does something like "grep pid: | cut -d: -f2"
is now broken by the patch.  Maybe add a new field like 'Pid-ns', 'PidNS',
or 'Pids' and leave the old one for compatibility?

2. Is it OK to show internal pids to unprivileged processes?  I cannot
see anything obviously dangerous with it, though.

> c) If pidns is nested, it depends on which pidns are you in.
> Tgid:	9 	3
> Pid:	9 	3
> ** Views from level 1 for Pid 1628 in host.

-- 
Vasily
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