linux-kernel - Re: [RFC][v8][PATCH 0/10] Implement clone3() system call

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Message-ID: <20091023192124.GA11088@us.ibm.com>
Date:	Fri, 23 Oct 2009 12:21:24 -0700
From:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Matt Helsley <matthltc@...ibm.com>,
	Oren Laadan <orenl@...rato.com>,
	Daniel Lezcano <daniel.lezcano@...e.fr>,
	randy.dunlap@...cle.com, arnd@...db.de, linux-api@...r.kernel.org,
	Containers <containers@...ts.linux-foundation.org>,
	Nathan Lynch <nathanl@...tin.ibm.com>,
	linux-kernel@...r.kernel.org, Louis.Rilling@...labs.com,
	kosaki.motohiro@...fujitsu.com, hpa@...or.com, mingo@...e.hu,
	torvalds@...ux-foundation.org,
	Alexey Dobriyan <adobriyan@...il.com>, roland@...hat.com,
	Pavel Emelyanov <xemul@...nvz.org>
Subject: Re: [RFC][v8][PATCH 0/10] Implement clone3() system call

Eric W. Biederman [ebiederm@...ssion.com] wrote:
| > Anyway, is RESERVED_PIDS meant for initial kernel-threads/daemons - if so
| > would it be ok enforce it only in init_pid_ns ?
| 
| It is mean for initial user space daemons, things that start on boot.
| 
| I don't know how much the protection matters at this date, but we have it.

Well, since it is not security or other critical restriction, can we allow
set_pidmap() a free hand - even in init-pid-ns ? It could prevent a simple
subtree C/R of one of the early daemons for debug for instance.

Sukadev
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