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Message-Id: <1469046427-12696-2-git-send-email-keescook@chromium.org>
Date: Wed, 20 Jul 2016 13:26:56 -0700
From: Kees Cook <keescook@...omium.org>
To: kernel-hardening@...ts.openwall.com
Cc: Kees Cook <keescook@...omium.org>,
Laura Abbott <labbott@...hat.com>,
Laura Abbott <labbott@...oraproject.org>,
Balbir Singh <bsingharora@...il.com>,
Daniel Micay <danielmicay@...il.com>,
Josh Poimboeuf <jpoimboe@...hat.com>,
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,
Christoph Lameter <cl@...ux.com>,
Pekka Enberg <penberg@...nel.org>,
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Andrew Morton <akpm@...ux-foundation.org>,
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Dmitry Vyukov <dvyukov@...gle.com>,
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Subject: [PATCH v4 01/12] mm: Add is_migrate_cma_page
From: Laura Abbott <labbott@...hat.com>
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>
Signed-off-by: Kees Cook <keescook@...omium.org>
---
include/linux/mmzone.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 02069c23486d..c8478b29f070 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
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