linux-kernel - Re: [RFC][PATCH 0/3] fork: Add the ability to create tasks with given pids

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Message-ID: <20111123162417.GE25780@google.com>
Date:	Wed, 23 Nov 2011 08:24:17 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Pedro Alves <pedro@...esourcery.com>
Cc:	Pavel Emelyanov <xemul@...allels.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alan Cox <alan@...ux.intel.com>,
	Roland McGrath <roland@...k.frob.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	James Bottomley <jbottomley@...allels.com>
Subject: Re: [RFC][PATCH 0/3] fork: Add the ability to create tasks with
 given pids

Hello,

On Wed, Nov 23, 2011 at 04:20:44PM +0000, Pedro Alves wrote:
> > Would CAP_CHECKPOINT be a shame too?  
> 
> I think CAP_CHECKPOINT (or something through some LSM) would be
> definitely better.
> 
> > I'm reluctant about priviledge
> > through fd inheritance mostly because of its unusualness.  I don't
> > think priv management is a good problem space for small creative
> > solutions.  We're much better off with mundane mechanisms which people
> > are already familiar with and is easy to account for.
> 
> fd inheritance wouldn't work for gdb; a user spawned gdb
> wouldn't inherit an open fd to kernel.ns_last_pid from anywhere.

I see.  So, let's do it for root for now and later add finer grained
CAP as necessary/viable.  Pavel, what do you think?

Thanks.

-- 
tejun
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