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From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des@des.no>
To: Pieter de Boer <pieter@thedarkside.nl>
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Date: Tue, 15 Sep 2009 14:42:28 +0200
In-Reply-To: <4AAF8775.7000002@thedarkside.nl> (Pieter de Boer's message of
	"Tue, 15 Sep 2009 14:24:21 +0200")
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Cc: freebsd-security@freebsd.org
Subject: Re: Protecting against kernel NULL-pointer derefs
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Pieter de Boer <pieter@thedarkside.nl> writes:
> Dag-Erling Sm=C3=B8rgrav <des@des.no> writes:
> > Pieter de Boer <pieter@thedarkside.nl> writes:
> > > Given the amount of NULL-pointer dereference vulnerabilities in
> > > the FreeBSD kernel that have been discovered of late,
> > Specify "amount" and define "of late".
> 'amount' =3D> 2, 'of late' is more figure of speech than anything
> else. For me, amount was high enough to get interested and 'of late'
> may be because I've not been looking long enough.

A search of FreeBSD security advisories shows two in the last four
years, plus the current unreleased issue.  I agree that there is no
reason to allow applications to mmap() at address 0, but surely there
must be a better way to make your case than to sow FUD?

DES
--=20
Dag-Erling Sm=C3=B8rgrav - des@des.no