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

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Message-ID: <alpine.DEB.2.00.1109191502040.13103@router.home>
Date:	Mon, 19 Sep 2011 15:02:34 -0500 (CDT)
From:	Christoph Lameter <cl@...two.org>
To:	Valdis.Kletnieks@...edu
cc:	Vasiliy Kulikov <segoon@...nwall.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Andrew Morton <akpm@...ux-foundation.org>,
	kernel-hardening@...ts.openwall.com, Kees Cook <kees@...ntu.com>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Christoph Lameter <cl@...ux-foundation.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 Mon, 19 Sep 2011, Valdis.Kletnieks@...edu wrote:

> On Mon, 19 Sep 2011 12:51:10 CDT, Christoph Lameter said:
>
> > IMHO a restriction of access to slab statistics is reasonable in a
> > hardened environment. Make it dependent on CONFIG_SECURITY or some such
> > thing?
>
> Probably need to invent a separate Kconfig variable - CONFIG_SECURITY
> is probably a way-too-big hammer for this nail. I can see lots of systems
> that want to enable that, but won't want to tighten access to slab.

There is already CONFIG_SECURITY_DMESG_RESTRICT. Generalize that setting
to include all sorts of other kernel statistics?

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