linux-kernel - Re: Security fix for remapping of page 0 (was [PATCH] Change ZERO_SIZE

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Message-ID: <20090603182949.5328d411@lxorguk.ukuu.org.uk>
Date:	Wed, 3 Jun 2009 18:29:49 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	"Larry H." <research@...reption.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-mm@...ck.org, Rik van Riel <riel@...hat.com>,
	linux-kernel@...r.kernel.org, pageexec@...email.hu
Subject: Re: Security fix for remapping of page 0 (was [PATCH] Change
 ZERO_SIZE_PTR to point at unmapped space)

> Ok. So what we need to do is stop this toying around with remapping of
> page 0. The following patch contains a fix and a test program that
> demonstrates the issue.

NAK - you've now broken half a dozen apps.

One way you could approach this would be to write a security module for
non SELINUX users - one that did one thing alone - decide whether the app
being run was permitted to map the low 64K perhaps by checking the
security label on the file.

Alan
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