linux-kernel - Re: [PATCH V5] x86: NX protection for kernel data

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Message-ID: <16086.1255420118@redhat.com>
Date:	Tue, 13 Oct 2009 08:48:38 +0100
From:	David Howells <dhowells@...hat.com>
To:	Siarhei Liakh <sliakh.lkml@...il.com>
Cc:	dhowells@...hat.com, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	Arjan van de Ven <arjan@...radead.org>,
	James Morris <jmorris@...ei.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@....de>, Rusty Russell <rusty@...tcorp.com.au>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Aristeu Rozanski <aris@...hat.com>
Subject: Re: [PATCH V5] x86: NX protection for kernel data

Siarhei Liakh <sliakh.lkml@...il.com> 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 script is adjusted so .text always starts and ends on a page boundary
> 2. Linker script is adjusted so .rodata and .data always start and
> end on a page boundary
> 3. void mark_nxdata_nx(void) added to arch/x86/mm/init.c with actual
> functionality: NX is set for all pages from _etext through _end.
> 4. mark_nxdata_nx() called from free_initmem() (after init has been released)
> 5. free_init_pages() sets released memory NX in arch/x86/mm/init.c
> 
> The patch have been developed for Linux 2.6.31-rc7 x86 by Siarhei Liakh
> <sliakh.lkml@...il.com> and Xuxian Jiang <jiang@...ncsu.edu>.
> 
> V1:  initial patch for 2.6.30
> V2:  patch for 2.6.31-rc7
> V3:  moved all code into arch/x86, adjusted credits
> V4:  fixed ifdef, removed credits from CREDITS
> V5:  fixed an address calculation bug in mark_nxdata_nx()
> ---
> 
> Signed-off-by: Siarhei Liakh <sliakh.lkml@...il.com>
> Signed-off-by: Xuxian Jiang <jiang@...ncsu.edu>

That seems to fix the problem, thanks.

Acked-by: David Howells <dhowells@...hat.com>
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