linux-kernel - Re: mprotect abuse in slim

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Message-Id: <200701091927.l09JRJXM021563@turing-police.cc.vt.edu>
Date:	Tue, 09 Jan 2007 14:27:19 -0500
From:	Valdis.Kletnieks@...edu
To:	Mimi Zohar <zohar@...ibm.com>
Cc:	Christoph Hellwig <hch@...radead.org>, akpm@...l.org,
	kjhall@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	safford@...son.ibm.com
Subject: Re: mprotect abuse in slim

On Mon, 08 Jan 2007 17:38:25 EST, Mimi Zohar said:

> revoked. Based on previous comments on lkml, we understand
> that this is not really possible in general, so SLIM only
> attempts to revoke access in certain simple cases.

Which, unfortunately, creates incredibly brittle code when some attacker
reads the SLIM source code and finds a way to force the non-simple case
you ignore.

This is an area where you really need to do it *right*, or not at all.

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