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

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Message-ID: <20110928215235.05d4f2e5@bob.linux.org.uk>
Date:	Wed, 28 Sep 2011 21:52:35 +0100
From:	Alan Cox <alan@...ux.intel.com>
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>, Valdis.Kletnieks@...edu,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] mm: restrict access to /proc/meminfo

On Wed, 28 Sep 2011 13:31:45 -0700
Dave Hansen <dave@...ux.vnet.ibm.com> wrote:

> 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)

I do not think that does what you intend 8)

I do like the idea - it avoids any interfaces vanishing and surprise
breakages while only CAP_SYS_whatever needs the real numbers
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