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

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Message-ID: <alpine.DEB.1.10.0906031121030.15621@gentwo.org>
Date:	Wed, 3 Jun 2009 11:23:47 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
cc:	"Larry H." <research@...reption.com>, linux-mm@...ck.org,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	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)

On Wed, 3 Jun 2009, Linus Torvalds wrote:

> The point being that we do need to support mmap at zero. Not necessarily
> universally, but it can't be some fixed "we don't allow that".

Hmmm... Depend on some capability? CAP_SYS_PTRACE may be something
remotely related?

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