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

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Message-ID: <1317413714.16137.666.camel@nimitz>
Date:	Fri, 30 Sep 2011 13:15:14 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm00@...il.com>
Cc:	Vasiliy Kulikov <segoon@...nwall.com>,
	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>, 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

I stuck a printk in there.  It's not exactly called 100x a second, but
there were 5 distinct users just for me to boot and ssh in:

[    3.130408] meminfo read called by: 'udevd' 1
[    3.326649] meminfo read called by: 'dhclient-script' 2
[    4.624943] meminfo read called by: 'klogd' 3
[    8.008019] meminfo read called by: 'dhclient-script' 4
[    8.083091] meminfo read called by: 'ps' 5
[   48.171038] meminfo read called by: 'bash' 6

Granted, those were likely privileged.  But, that's a good list of
processes that I would rather not see break.

-- Dave

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