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

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Date:	Tue, 13 Oct 2009 07:35:28 -0400
From:	Siarhei Liakh <sliakh.lkml@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
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

>> 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?

Thanks.
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