linux-kernel - Re: [patch 0/4] MAP_NOZERO v2 - VM_NOZERO/MAP

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Message-ID: <4689826C.5050800@redhat.com>
Date:	Mon, 02 Jul 2007 18:55:40 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Davide Libenzi <davidel@...ilserver.org>
CC:	Ulrich Drepper <drepper@...il.com>,
	Andy Isaacson <adi@...apodia.org>,
	Kyle Moffett <mrmacman_g4@....com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [patch 0/4] MAP_NOZERO v2 - VM_NOZERO/MAP_NOZERO early summer
 madness

Davide Libenzi wrote:
> On Mon, 2 Jul 2007, Ulrich Drepper wrote:
> 
>> On 7/2/07, Rik van Riel <riel@...hat.com> wrote:
>>> That should not happen.  The default SELinux configuration
>>> in Fedora (and Debian?) runs a few daemons in their own
>>> restricted modes and has most of the system running in
>>> unconfined_t, including the majority of user programs.
>> This is the state as of F7.  This will change hopefully soon.
>> Programs like firefox run by normal users must be confined, to. Any
>> tests using security must be fast, it's not something which is done
>> only for a few apps.
> 
> The strong requirement would be that the cookie is not a bit longer than 
> sizeof(unsigned long).

You could easily replace the cookie with a pointer to a free
page pool.

-- 
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the best in the world, and those who believe it already is.  Each group
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