On Wed, Aug 20, 2014 at 07:04:35PM +0400, Konstantin Khlebnikov wrote: > 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@xxxxxxxxxxx> > Reported-by: Sasha Levin <sasha.levin@xxxxxxxxxx> > Link: http://lkml.kernel.org/p/53E6CEAA.9020105@xxxxxxxxxx > Cc: stable <stable@xxxxxxxxxxxxxxx> # 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); > } > > /* > Acked-by: Rafael Aquini <aquini@xxxxxxxxxx> -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>