linux-kernel - Re: [RFC][v8][PATCH 3/10]: Make pid_max a pid

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Date:	Tue, 13 Oct 2009 20:10:30 +0400
From:	Pavel Emelyanov <xemul@...nvz.org>
To:	"Serge E. Hallyn" <serue@...ibm.com>
CC:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, Oren Laadan <orenl@...columbia.edu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Andrew Morton <akpm@...l.org>, torvalds@...ux-foundation.org,
	mikew@...gle.com, mingo@...e.hu, hpa@...or.com,
	Nathan Lynch <nathanl@...tin.ibm.com>, arnd@...db.de,
	peterz@...radead.org, Louis.Rilling@...labs.com, roland@...hat.com,
	kosaki.motohiro@...fujitsu.com, randy.dunlap@...cle.com,
	linux-api@...r.kernel.org,
	Containers <containers@...ts.linux-foundation.org>,
	sukadev@...ibm.com
Subject: Re: [RFC][v8][PATCH 3/10]: Make pid_max a pid_ns property

> This patch isn't a core part of the clone_with_pid functionality,
> just something Eric has asked for.  So I don't object to dropping
> it.  But I disagree with Alexey's claim that this isn't a namespace
> property.  It should be.

OK

>> frankly I don't see the reason for doing so. Why should we?
>> Especially taking into account, that we essentially cannot
>> change thin in the namespace level 3 and deeper?
> 
> What do you mean by that?  With this patchset we're not, it's
> true, but we trivially can - even now, userspace can simply not
> give the container CAP_SYS_ADMIN or write access to the sysctl
> so they can't do any more CLONE_NEWPIDS or change the sysctl.

It's a misprint - I meant "level 2 and deeper". Sysctl is
only pointing at the init_pid_ns variable.

> -serge
> 

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