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Reply-To: kernel-hardening@lists.openwall.com
Date: Mon, 12 Sep 2011 19:06:30 +0400
From: Cyrill Gorcunov <gorcunov@gmail.com>
Message-ID: <20110912150630.GE25367@sun>
References: <20110910164001.GA2342@albatros>
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Subject: [kernel-hardening] Re: [RFC PATCH 2/2] mm: restrict access to /proc/slabinfo
To: Vasiliy Kulikov <segoon@openwall.com>
Cc: kernel-hardening@lists.openwall.com, Andrew Morton <akpm@linux-foundation.org>, Al Viro <viro@zeniv.linux.org.uk>, Christoph Lameter <cl@linux-foundation.org>, Pekka Enberg <penberg@kernel.org>, Matt Mackall <mpm@selenic.com>, linux-kernel@vger.kernel.org, linux-mm@kvack.org
List-ID: <kernel-hardening.lists.openwall.com>

On Sat, Sep 10, 2011 at 08:41:34PM +0400, Vasiliy Kulikov wrote:
> Historically /proc/slabinfo has 0444 permissions and is accessible to
> the world.  slabinfo contains rather private information related both to
> the kernel and userspace tasks.  Depending on the situation, it might
> reveal either private information per se or information useful to make
> another targeted attack.  Some examples of what can be learned by
> reading/watching for /proc/slabinfo entries:
> 
...

Since this file is controversy point, probably its permissions might be
configurable via setup option?

	Cyrill