linux-kernel - Re: [RFC] fs, proc: Introduce the /proc/<pid>/map

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Message-ID: <20110825140434.GU25996@one.firstfloor.org>
Date:	Thu, 25 Aug 2011 16:04:35 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Pavel Emelyanov <xemul@...allels.com>
Cc:	Andi Kleen <andi@...stfloor.org>, Zan Lynx <zlynx@....org>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Nathan Lynch <ntl@...ox.com>,
	Oren Laadan <orenl@...columbia.edu>,
	Daniel Lezcano <dlezcano@...ibm.com>,
	Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Glauber Costa <glommer@...allels.com>,
	"containers@...ts.osdl.org" <containers@...ts.osdl.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	LINUXFS-ML <linux-fsdevel@...r.kernel.org>,
	James Bottomley <jbottomley@...allels.com>
Subject: Re: [RFC] fs, proc: Introduce the /proc/<pid>/map_files/ directory v2

On Thu, Aug 25, 2011 at 10:42:44AM +0400, Pavel Emelyanov wrote:
> On 08/24/2011 09:36 PM, Andi Kleen wrote:
> > Pavel Emelyanov <xemul@...allels.com> writes:
> >>
> >> No and this is the trick - when you readlink it - it give you trash, but
> >> when you open one - you get exactly the same file as the map points to.
> > 
> > Isn't that a minor security hole?
> > 
> > For example if I pass a file descriptor into a chroot process for
> > reading, and with this interface you can open it for writing too.
> > I could see this causing problems.
> 
> How does it differ from the /proc/pid/fd links?

Those cannot be opened I thought.
-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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