The patch titled
Subject: mm/balloon_compaction: ignore anonymous pages
has been added to the -mm tree. Its filename is
mm-balloon_compaction-ignore-anonymous-pages.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-balloon_compaction-ignore-anonymous-pages.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-balloon_compaction-ignore-anonymous-pages.patch
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------------------------------------------------------
From: Konstantin Khlebnikov <k.khlebnikov@xxxxxxxxxxx>
Subject: mm/balloon_compaction: ignore anonymous pages
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.
See http://lkml.kernel.org/p/53E6CEAA.9020105@xxxxxxxxxx.
Signed-off-by: Konstantin Khlebnikov <k.khlebnikov@xxxxxxxxxxx>
Reported-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
Acked-by: Rafael Aquini <aquini@xxxxxxxxxx>
Cc: Andrey Ryabinin <ryabinin.a.a@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> [v3.8+]
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/balloon_compaction.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN include/linux/balloon_compaction.h~mm-balloon_compaction-ignore-anonymous-pages include/linux/balloon_compaction.h
--- a/include/linux/balloon_compaction.h~mm-balloon_compaction-ignore-anonymous-pages
+++ a/include/linux/balloon_compaction.h
@@ -128,7 +128,7 @@ static inline bool page_flags_cleared(st
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);
}
/*
_
Patches currently in -mm which might be from k.khlebnikov@xxxxxxxxxxx are
mm-balloon_compaction-ignore-anonymous-pages.patch
mm-balloon_compaction-keep-ballooned-pages-away-from-normal-migration-path.patch
mm-balloon_compaction-isolate-balloon-pages-without-lru_lock.patch
mm-introduce-common-page-state-for-ballooned-memory.patch
mm-balloon_compaction-use-common-page-ballooning.patch
mm-balloon_compaction-general-cleanup.patch
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