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

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Message-ID: <30918.1317257024@turing-police.cc.vt.edu>
Date:	Wed, 28 Sep 2011 20:43:44 -0400
From:	Valdis.Kletnieks@...edu
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
Cc:	Christoph Lameter <cl@...two.org>,
	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>,
	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 Wed, 28 Sep 2011 13:31:45 PDT, Dave Hansen said:

> We could also just _effectively_ make it output in MB:
> 
> 	foo = foo & ~(1<<20)
> 
> or align-up.

I think we want align-up here, there's a bunch of fields that code probably
expects to be non-zero on a system that's finished booting...

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

That also sounds like a good idea.

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