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

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Date: Wed, 7 Sep 2011 15:23:01 +0400
From: Vasiliy Kulikov <segoon@...nwall.com>
To: Tejun Heo <tj@...nel.org>
Cc: Cyrill Gorcunov <gorcunov@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	containers@...ts.osdl.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, Nathan Lynch <ntl@...ox.com>,
	kernel-hardening@...ts.openwall.com,
	Oren Laadan <orenl@...columbia.edu>,
	Daniel Lezcano <dlezcano@...ibm.com>,
	Glauber Costa <glommer@...allels.com>,
	James Bottomley <jbottomley@...allels.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Al Viro <viro@...IV.linux.org.uk>,
	Pavel Emelyanov <xemul@...allels.com>
Subject: Re: [patch 2/2] fs, proc: Introduce the /proc/<pid>/map_files/
 directory v6

Hi,

On Wed, Sep 07, 2011 at 02:33 +0900, Tejun Heo wrote:
> On Tue, Sep 06, 2011 at 09:29:52PM +0400, Vasiliy Kulikov wrote:
> > I agree with you.  I don't think that showing system-global debug
> > information to all users by default is the right thing.  But some people
> > doesn't agree with this point of view:
> > 
> > http://thread.gmane.org/gmane.linux.kernel/1108378
> 
> Yeap, I know there are two sides of the discussion but if one takes
> the position that hiding such global debug info is more harmful, it's
> only crazier to hide such information from each individual users of
> the said global facility.  So, let's just forget about information
> leak via freeing or not freeing here.  It's the wrong battle field.

Andrew, are you OK with closing the hole with pid_no_revalidate()
and 0600 /proc/slabinfo?  If so, I feel I have to start this discussion
with people participating in the discussion above: Theodore, Dan, Linus, etc.

Thanks,

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

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