linux-kernel - [PATCH v2 1/6] mm/balloon_compaction: ignore anonymous pages

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Date:	Sat, 30 Aug 2014 20:41:09 +0400
From:	Konstantin Khlebnikov <koct9i@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Konstantin Khlebnikov <k.khlebnikov@...sung.com>,
	Rafael Aquini <aquini@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-mm@...ck.org, Andrey Ryabinin <ryabinin.a.a@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>
Subject: [PATCH v2 1/6] mm/balloon_compaction: ignore anonymous pages

From: Konstantin Khlebnikov <k.khlebnikov@...sung.com>

Sasha Levin reported KASAN splash inside isolate_migratepages_range().
Problem is in function __is_movable_balloon_page() which tests AS_BALLOON_MAP
in page->mapping->flags. This function has no protection against anonymous
pages. As result it tried to check address space flags in inside anon-vma.

Signed-off-by: Konstantin Khlebnikov <k.khlebnikov@...sung.com>
Reported-by: Sasha Levin <sasha.levin@...cle.com>
Link: http://lkml.kernel.org/p/53E6CEAA.9020105@oracle.com
Cc: stable <stable@...r.kernel.org> # v3.8
---
 include/linux/balloon_compaction.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/balloon_compaction.h b/include/linux/balloon_compaction.h
index 089743a..53d482e 100644
--- a/include/linux/balloon_compaction.h
+++ b/include/linux/balloon_compaction.h
@@ -128,7 +128,7 @@ static inline bool page_flags_cleared(struct page *page)
 static inline bool __is_movable_balloon_page(struct page *page)
 {
 	struct address_space *mapping = page->mapping;
-	return mapping_balloon(mapping);
+	return !PageAnon(page) && mapping_balloon(mapping);
 }
 
 /*

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