linux-kernel - Re: Eliminating kernel mixed page (code + data)

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Message-ID: <817ecb6f0909140534m62392cc2v8e5aacc35034661c@mail.gmail.com>
Date:	Mon, 14 Sep 2009 08:34:37 -0400
From:	Siarhei Liakh <sliakh.lkml@...il.com>
To:	Eric Lacombe <goretux@...il.com>
Cc:	Mel Gorman <mel@....ul.ie>, Greg KH <gregkh@...e.de>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Eric Lacombe <eric.lacombe@...urity-labs.org>
Subject: Re: Eliminating kernel mixed page (code + data)

> First, is there a kernel option to enforce kernel code and kernel data
> separation among pages ?

I do not think so.

> Otherwise, is it sufficient to enforce page alignment for the start address of
> all data segment, to achieve this goal ?
> (on top of using CONFIG_RELOCATABLE)

AFAIK, this would be required but not sufficient. I am currently
working on a set of patches that:
1. eliminate mixed pages in kernel space
2. keep data as non-executable and code as read-only

As a starting point, you can search for my name in the mailing list to
see the patches and the discussion around them.
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