linux-kernel - Re: [PATCH 2/2] mm: restrict access to /proc/meminfo

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Message-ID: <20110930201256.GB5173@albatros>
Date:	Sat, 1 Oct 2011 00:12:56 +0400
From:	Vasiliy Kulikov <segoon@...nwall.com>
To:	Andrew Morton <akpm00@...il.com>
Cc:	kernel-hardening@...ts.openwall.com,
	Christoph Lameter <cl@...ux-foundation.org>,
	Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>, linux-mm@...ck.org,
	Kees Cook <kees@...ntu.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>, Valdis.Kletnieks@...edu,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Alan Cox <alan@...ux.intel.com>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 2/2] mm: restrict access to /proc/meminfo

On Fri, Sep 30, 2011 at 13:03 -0700, Andrew Morton wrote:
> meminfo has been around for a very long time and is a convenient and
> centralised point for collecting memory data.  There will be a large
> number of apps/scripts/tools out there which use it.  Many of these
> won't even be available to us.
> 
> All of which makes it very hard for us to predict how much breakage we
> will cause.
> 
> > If we care about (2), we should pass non-zero counters, but imagine some
> > default values, which will result in sane processes numbers.  But it
> > might depend on specific applications, I'm not aware whether (2) is
> > real.
> > 
> > 
> > Other ideas?
> 
> echo "chmod 0400 /proc/meminfo" >> /etc/rc.local

How will it help to fix apps' dependencies on meminfo?

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