linux-kernel - Re: [patch 2/2] fs, proc: Introduce the /proc/<pid>/map

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Message-ID: <20110915105651.GA17575@albatros>
Date:	Thu, 15 Sep 2011 14:56:51 +0400
From:	Vasiliy Kulikov <segoon@...nwall.com>
To:	Cyrill Gorcunov <gorcunov@...il.com>
Cc:	Pavel Machek <pavel@....cz>, Andrew Morton <akpm00@...il.com>,
	linux-kernel@...r.kernel.org, containers@...ts.osdl.org,
	linux-fsdevel@...r.kernel.org,
	Kirill Shutemov <kirill@...temov.name>,
	Pavel Emelyanov <xemul@...allels.com>,
	James Bottomley <jbottomley@...allels.com>,
	Nathan Lynch <ntl@...ox.com>, Zan Lynx <zlynx@....org>,
	Daniel Lezcano <dlezcano@...ibm.com>,
	Tejun Heo <tj@...nel.org>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Al Viro <viro@...IV.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [patch 2/2] fs, proc: Introduce the /proc/<pid>/map_files/
 directory v12

On Thu, Sep 15, 2011 at 14:29 +0400, Cyrill Gorcunov wrote:
> On Thu, Sep 15, 2011 at 01:27:57PM +0400, Vasiliy Kulikov wrote:
> ...
> > 
> > > in case two of them has a mapping shared, we map
> > >    the memory by the 1st one and then open its /proc/$pid/map_files/address file and
> > >    map it by the 2nd task.
> > 
> > How can you restore a set of processes in case they share an RW mapping
> > as RW in both tasks if you deny opening /proc/$pid/map_files/$address as W?
> 
> I can read the link first to figure out the file path and re-open it as rw via
> path itself (which implies the restorer still must have enough rights to open
> it as rw).

And what about RW mapping of unlinked files?

-- 
Vasiliy Kulikov
http://www.openwall.com - bringing security into open computing environments
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