linux-kernel - Re: [Ksummit-2010-discuss] checkpoint-restart: naked patch

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Date:	Fri, 19 Nov 2010 18:25:13 +0200
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Kirill Korotaev <dev@...allels.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Kapil Arya <kapil@....neu.edu>,
	Gene Cooperman <gene@....neu.edu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Pavel Emelianov <xemul@...allels.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Linux Containers <containers@...ts.osdl.org>
Subject: Re: [Ksummit-2010-discuss] checkpoint-restart: naked patch

On Fri, Nov 19, 2010 at 6:10 PM, Tejun Heo <tj@...nel.org> wrote:
> Well, if you ask me, having pidns w/o a way to reinstate PID from
> userland is pretty silly

No.
Chrome uses CLONE_PID so that exploit couldn't attach to processes in
parent pidns.

> and you and I might not know yet but it's
> quite imaginable that there will be other use cases for the capability
> unlike in-kernel CR.  Kernel provides building blocks not the whole
> frigging package and for very good reasons.

Speaking of pids, pid's value itself is never interesing (except maybe pid 1).
It's a cookie.

CLONE_SET_PID came up only now because only C/R wants it.
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