linux-kernel - Re: [PATCH] Protection for exploiting null dereference using mmap

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Date:	Tue, 5 Jun 2007 17:00:51 -0400 (EDT)
From:	James Morris <jmorris@...ei.org>
To:	Eric Paris <eparis@...hat.com>
cc:	linux-kernel@...r.kernel.org, selinux@...ho.nsa.gov,
	Alan Cox <alan@...hat.com>, drepper@...hat.com,
	roland@...hat.com, arjan@...radead.org, mingo@...e.hu,
	viro@...iv.linux.org.uk, chrisw@...hat.com, sds@...ho.nsa.gov,
	sgrubb@...hat.com
Subject: Re: [PATCH] Protection for exploiting null dereference using mmap

On Tue, 5 Jun 2007, Eric Paris wrote:

> +extern int mmap_protect_memory;

This should be an unsigned long.

I wonder if the default should be for this value to be zero (i.e. preserve 
existing behavior).  It could break binaries, albeit potentially insecure 
ones.


- James
-- 
James Morris
<jmorris@...ei.org>
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