linux-kernel - [PATCH 1/7] mm/balloon_compaction: ignore anonymous pages

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-id: <20140820150435.4194.28003.stgit@buzz>
Date:	Wed, 20 Aug 2014 19:04:35 +0400
From:	Konstantin Khlebnikov <k.khlebnikov@...sung.com>
To:	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	Rafael Aquini <aquini@...hat.com>
Cc:	Sasha Levin <sasha.levin@...cle.com>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/7] 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.

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);
 }
 
 /*

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/