linux-kernel - Re: [PATCH 1/4] [x86/mm] Correcting improper large page preservation

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Date:	Thu, 27 May 2010 12:49:10 -0400
From:	Siarhei Liakh <sliakh.lkml@...il.com>
To:	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, linux-next@...r.kernel.org
Cc:	Arjan van de Ven <arjan@...radead.org>,
	James Morris <jmorris@...ei.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@....de>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Dave Jones <davej@...hat.com>
Subject: Re: [PATCH 1/4] [x86/mm] Correcting improper large page preservation

On Thu, May 27, 2010 at 12:45 PM, Siarhei Liakh <sliakh.lkml@...il.com> wrote:
> This patch fixes a bug in try_preserve_large_page() which may result
> in improper large page preservation and improper application of page
> attributes to the memory area outside of the original change request.
> More specifically, the problem manifests itself when set_memory_*() is
> called for several pages at the beginning of the large page and
[...]
> V1:  try_preserve_large_page() patch for Linux 2.6.34-rc2
>
> Signed-off-by: Siarhei Liakh <sliakh.lkml@...il.com>
> Signed-off-by: Xuxian Jiang <jiang@...ncsu.edu>
> ---
>
> diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
> index cf07c26..6844675 100644
> --- a/arch/x86/mm/pageattr.c
> +++ b/arch/x86/mm/pageattr.c
> @@ -255,6 +255,7 @@ static inline pgprot_t static_protections(pgprot_t
[..]
> +               cpa->numpages == (psize >> PAGE_SHIFT)) {
>               /*
>                * The address is aligned and the number of pages
>                * covers the full page.
>

Please disregard this patch. Version 2 will be re-posted shortly.
Sorry for mistake.
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