linux-kernel - Re: [PATCH] x86: NX protection for kernel data

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Message-ID: <alpine.LFD.2.00.0907192212100.11571@localhost.localdomain>
Date:	Sun, 19 Jul 2009 22:18:45 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Siarhei Liakh <sliakh.lkml@...il.com>
cc:	LKML <linux-kernel@...r.kernel.org>,
	linux-security-module@...r.kernel.org,
	Andi Kleen <andi@...stfloor.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Arjan van de Ven <arjan@...radead.org>,
	Ingo Molnar <mingo@...e.hu>, James Morris <jmorris@...ei.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>, linux-cris-kernel@...s.com,
	Roland Dreier <rdreier@...co.com>
Subject: Re: [PATCH] x86: NX protection for kernel data

On Sun, 19 Jul 2009, Siarhei Liakh wrote:

> This patch expands functionality of CONFIG_DEBUG_RODATA to set main
> (static) kernel data area as NX.
> The following steps are taken to achieve this:
> 1. Linker scripts are adjusted so .text always starts and end on a page boundary
> 2. Linker scripts are adjusted so .rodata and .data always starts and
> end on a page boundary
> 3. void mark_nxdata_nx(void) added to arch/x86/mm/init_64.c and
> arch/x86/mm/init_32.c with actual functionality: NX is set for all
> pages from _etext through _edata

Please avoid adding the identical function to both files.
arch/x86/mm/init.c is the correct place.

Thanks,

	tglx
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