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

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Date:	Tue, 5 Jun 2007 17:16:16 -0400
From:	Alan Cox <alan@...hat.com>
To:	James Morris <jmorris@...ei.org>
Cc:	Eric Paris <eparis@...hat.com>, 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, Jun 05, 2007 at 05:00:51PM -0400, James Morris wrote:
> 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 

Agreed - DOSemu type apps and lrmi need to map at zero for vm86
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