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Date: Tue, 19 Jul 2016 15:40:46 -0700
From: Kees Cook <keescook@...omium.org>
To: Laura Abbott <labbott@...hat.com>
Cc: LKML <linux-kernel@...r.kernel.org>, Rik van Riel <riel@...hat.com>,
Casey Schaufler <casey@...aufler-ca.com>, PaX Team <pageexec@...email.hu>,
Brad Spengler <spender@...ecurity.net>, Russell King <linux@...linux.org.uk>,
Catalin Marinas <catalin.marinas@....com>, Will Deacon <will.deacon@....com>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>, Michael Ellerman <mpe@...erman.id.au>,
Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghua.yu@...el.com>,
"David S. Miller" <davem@...emloft.net>, "x86@...nel.org" <x86@...nel.org>, Christoph Lameter <cl@...ux.com>,
Pekka Enberg <penberg@...nel.org>, David Rientjes <rientjes@...gle.com>,
Joonsoo Kim <iamjoonsoo.kim@....com>, Andrew Morton <akpm@...ux-foundation.org>,
Andy Lutomirski <luto@...nel.org>, Borislav Petkov <bp@...e.de>, Mathias Krause <minipli@...glemail.com>,
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Andrea Arcangeli <aarcange@...hat.com>, Dmitry Vyukov <dvyukov@...gle.com>,
Laura Abbott <labbott@...oraproject.org>,
"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, linux-ia64@...r.kernel.org,
"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>, sparclinux <sparclinux@...r.kernel.org>,
linux-arch <linux-arch@...r.kernel.org>, Linux-MM <linux-mm@...ck.org>,
"kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>
Subject: Re: [PATCH] mm: Add is_migrate_cma_page
On Tue, Jul 19, 2016 at 3:00 PM, Laura Abbott <labbott@...hat.com> wrote:
> Code such as hardened user copy[1] needs a way to tell if a
> page is CMA or not. Add is_migrate_cma_page in a similar way
> to is_migrate_isolate_page.
>
> [1]http://article.gmane.org/gmane.linux.kernel.mm/155238
>
> Signed-off-by: Laura Abbott <labbott@...hat.com>
Great, thanks!
> ---
> Here's an explicit patch, slightly different than what I posted before. It can
> be kept separate or folded in as needed.
Assuming there's no objection, I'll add it to my tree and use the new macro.
-Kees
> ---
> include/linux/mmzone.h | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> index 02069c2..c8478b2 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -68,8 +68,10 @@ extern char * const migratetype_names[MIGRATE_TYPES];
>
> #ifdef CONFIG_CMA
> # define is_migrate_cma(migratetype) unlikely((migratetype) == MIGRATE_CMA)
> +# define is_migrate_cma_page(_page) (get_pageblock_migratetype(_page) == MIGRATE_CMA)
> #else
> # define is_migrate_cma(migratetype) false
> +# define is_migrate_cma_page(_page) false
> #endif
>
> #define for_each_migratetype_order(order, type) \
> --
> 2.7.4
>
--
Kees Cook
Chrome OS & Brillo Security
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