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

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Message-ID: <20110825143004.GC3455@sun>
Date:	Thu, 25 Aug 2011 18:30:04 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Pavel Emelyanov <xemul@...allels.com>, Zan Lynx <zlynx@....org>,
	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 04:04:35PM +0200, Andi Kleen wrote:
...
> > > 
> > > 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
> 

We have ptrace_may_access in lookup so I don't think you'll be
able to open it from another namespace or/and if you have not
enough credentials to.

	Cyrill
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