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

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Message-ID: <1317241905.16137.516.camel@nimitz>
Date:	Wed, 28 Sep 2011 13:31:45 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Christoph Lameter <cl@...two.org>
Cc:	David Rientjes <rientjes@...gle.com>,
	Vasiliy Kulikov <segoon@...nwall.com>,
	kernel-hardening@...ts.openwall.com,
	Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	Kees Cook <kees@...ntu.com>, Valdis.Kletnieks@...edu,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Alan Cox <alan@...ux.intel.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] mm: restrict access to /proc/meminfo

On Tue, 2011-09-27 at 15:47 -0500, Christoph Lameter wrote:
> On Tue, 27 Sep 2011, David Rientjes wrote:
> > It'll turn into another one of our infinite number of capabilities.  Does
> > anything actually care about statistics at KB granularity these days?
> 
> Changing that to MB may also break things. It may be better to have
> consistent system for access control to memory management counters that
> are not related to a process.

We could also just _effectively_ make it output in MB:

	foo = foo & ~(1<<20)

or align-up.  We could also give the imprecise numbers to unprivileged
users and let privileged ones see the page-level ones.

-- Dave

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