linux-kernel - Re: [PATCH 1/2] mm: restrict access to slab files under procfs and sysfs

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Date:	Tue, 27 Sep 2011 23:16:58 +0400
From:	Vasiliy Kulikov <segoon@...nwall.com>
To:	Christoph Lameter <cl@...two.org>
Cc:	kernel-hardening@...ts.openwall.com,
	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
Subject: Re: [PATCH 1/2] mm: restrict access to slab files under procfs and
 sysfs

On Tue, Sep 27, 2011 at 13:08 -0500, Christoph Lameter wrote:
> Possible candidates:
> 
> christoph@...y:~/n/linux-2.6$ grep proc_create mm/*
> mm/swapfile.c:	proc_create("swaps", 0, NULL, &proc_swaps_operations);
> mm/vmstat.c:	proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);
> mm/vmstat.c:	proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops);
> mm/vmstat.c:	proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations);
> mm/vmstat.c:	proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
> 
> vmstat and zoneinfo in particular give similar information to what is
> revealed through the slab proc files.

Do you know whether these files are actively used?  I don't want to
break tools like "free" or "top".  In this case we'll have to discover
another way to limit this information.

Thank you!

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