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

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Message-ID: <20091013122815.GB5561@elte.hu>
Date:	Tue, 13 Oct 2009 14:28:15 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Siarhei Liakh <sliakh.lkml@...il.com>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.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>,
	David Howells <dhowells@...hat.com>,
	Aristeu Rozanski <aris@...hat.com>
Subject: Re: [PATCH V5] x86: NX protection for kernel data


* Siarhei Liakh <sliakh.lkml@...il.com> wrote:

> >> I like doing this, but... maybe it is useful to have a diff of the
> >> pagetable dump (PT_DUMP config option) to show the effect, in the
> >> changelog. That'd be like the proof on the pudding...
> >
> > That's a good suggestion. Siarhei Liakh, mind doing that?
> 
> Here you go:
> ===============================================
> --- data_nx_pt_before.txt	2009-10-13 07:26:17.000000000 -0400
> +++ data_nx_pt_after.txt	2009-10-13 07:26:46.000000000 -0400
> @@ -2,12 +2,9 @@
>  0x00000000-0xc0000000           3G                           pmd
>  ---[ Kernel Mapping ]---
>  0xc0000000-0xc0100000           1M     RW             GLB x  pte
> -0xc0100000-0xc048d000        3636K     ro             GLB x  pte
> -0xc048d000-0xc04d0000         268K     RW             GLB x  pte
> -0xc04d0000-0xc04d2000           8K     RW             GLB NX pte
> -0xc04d2000-0xc04d3000           4K     RW             GLB x  pte
> -0xc04d3000-0xc0531000         376K     RW             GLB NX pte
> -0xc0531000-0xc0600000         828K     RW             GLB x  pte
> +0xc0100000-0xc0381000        2564K     ro             GLB x  pte
> +0xc0381000-0xc048d000        1072K     ro             GLB NX pte
> +0xc048d000-0xc0600000        1484K     RW             GLB NX pte
>  0xc0600000-0xf7800000         882M     RW         PSE GLB NX pmd
>  0xf7800000-0xf79fe000        2040K     RW             GLB NX pte
>  0xf79fe000-0xf7a00000           8K                           pte
> ===============================================
> 
> Would you like me to re-post whole patch with this addition?

Yep, v6 with Arjan's ack (once he sends it) would be handy.

	Ingo
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