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

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Date:	Wed, 6 Jun 2007 19:01:59 +1000
From:	Russell Coker <russell@...er.com.au>
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, jmorris@...ei.org, chrisw@...hat.com,
	sds@...ho.nsa.gov, sgrubb@...hat.com
Subject: Re: [PATCH] Protection for exploiting null dereference using mmap

On Wednesday 06 June 2007 06:34, Eric Paris <eparis@...hat.com> wrote:
> This patch uses a new SELinux security class "memprotect."  Policy
> already contains a number of allow rules like  a_t self:process *
> (unconfined_t being one of them) which mean that putting this check in
> the process class (its best current fit) would make it useless as all

I think it would be best to use the process class and change the "*" rules to 
~{ memprotect }.

-- 
russell@...er.com.au
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