linux-kernel - Re: [patch] PID namespace design bug, workaround

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Message-Id: <1194062579.3736.4.camel@entropy>
Date:	Fri, 02 Nov 2007 21:02:59 -0700
From:	Nicholas Miell <nmiell@...cast.net>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Dave Hansen <haveblue@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Ulrich Drepper <drepper@...hat.com>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	"Dinakar Guniguntala [imap]" <dino@...ibm.com>,
	Sripathi Kodi <sripathik@...ibm.com>
Subject: Re: [patch] PID namespace design bug, workaround

On Fri, 2007-11-02 at 10:39 -0700, Linus Torvalds wrote:
> 
> On Fri, 2 Nov 2007, Dave Hansen wrote:
> > 
> > There are certainly more of these, but here is one In the futex
> > userspace address, we install the current pid's vnr into a userspace
> > address.  
> 
> Now, realistically, why not just say "you can't use these things across 
> namespaces"? Does anybody really care? After all, somebody who screws this 
> up only screws himself, not anybody else.
> 
> 		Linus

Accessing the same robust futex from different PID namespaces on the
same machine via a shared file mapping is logically equivalent to
accessing the same robust futex from different machines via a shared
filesystem and there's no reason to expect either operation to work
correctly.

-- 
Nicholas Miell <nmiell@...cast.net>

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