linux-kernel - Re: [kernel-hardening] Re: [RFC PATCH 2/2] mm: restrict access to /proc/slabinfo

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Date:	Wed, 14 Sep 2011 11:24:40 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Vasiliy Kulikov <segoon@...nwall.com>
Cc:	kernel-hardening@...ts.openwall.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Dan Rosenberg <drosenberg@...curity.com>,
	Theodore Tso <tytso@....edu>, Alan Cox <alan@...ux.intel.com>,
	Jesper Juhl <jj@...osbits.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [kernel-hardening] Re: [RFC PATCH 2/2] mm: restrict access to
 /proc/slabinfo

On Wed, 2011-09-14 at 19:42 +0400, Vasiliy Kulikov wrote:
> > In other words, I dunno.  If we do this in the kernel, can we at least
> > do something like CONFIG_INSECURE to both track these kinds of things
> > and make it easy to get them out of a developer's way?
> 
> What do you think about adding your user to the slabinfo's group or
> chmod it - quite the opposite Ubuntu currently does?  I think it is more
> generic (e.g. you may chmod 0444 to allow all users to get debug
> information or just 0440 and chgrp admin to allow only trusted users to
> do it) and your local policy doesn't touch the kernel.

That obviously _works_.  I'd be happy to ack your patch.  As I said,
it's pretty minimally painful, even to folks who care about slabinfo
like me.

-- Dave

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