From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752127AbaHTPEm (ORCPT ); Wed, 20 Aug 2014 11:04:42 -0400 Received: from mailout2.w1.samsung.com ([210.118.77.12]:17641 "EHLO mailout2.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751686AbaHTPEk (ORCPT ); Wed, 20 Aug 2014 11:04:40 -0400 X-AuditID: cbfec7f5-b7f776d000003e54-a3-53f4b9053610 Subject: [PATCH 1/7] mm/balloon_compaction: ignore anonymous pages From: Konstantin Khlebnikov To: linux-mm@kvack.org, Andrew Morton , Rafael Aquini Cc: Sasha Levin , Andrey Ryabinin , linux-kernel@vger.kernel.org Date: Wed, 20 Aug 2014 19:04:35 +0400 Message-id: <20140820150435.4194.28003.stgit@buzz> User-Agent: StGit/0.17.1-dirty MIME-version: 1.0 Content-type: text/plain; charset=utf-8 Content-transfer-encoding: 7bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrDLMWRmVeSWpSXmKPExsVy+t/xa7qsO78EG0xoYrSYs34Nm8WMh79Y LH7s7GW1uLxrDpvFvTX/WS2Ob93CbLH4yG1mB3aPnbPusnts+jSJ3ePEjN8sHh+f3mLxeL/v KptH35ZVjB6fN8kFsEdx2aSk5mSWpRbp2yVwZbTO+sJW8JqjYt+MLewNjFfZuxg5OSQETCQm XfsAZYtJXLi3ng3EFhJYyijxcQU3hN3IJLFofy2ILSzgJPFjWi8ziM0mYCaxbd9tRhBbRCBN 4uuzLWC9zAJFEi9uzgKzWQRUJV6+3c0KYvMKGEl0TvgLtktUQE5i5eUWqLigxI/J91i6GDmA etUlpkzJhRgjL7F5zVvmCYx8s5BUzUKomoWkagEj8ypG0dTS5ILipPRcI73ixNzi0rx0veT8 3E2MkBD+uoNx6TGrQ4wCHIxKPLw3F30JFmJNLCuuzD3EKMHBrCTCe2IDUIg3JbGyKrUoP76o NCe1+BAjEwenVANj3qbZXFOPPznU/7JX69uE/cdTeltuhlgX5GbMeejjN3n2i76y5umTeGtu v079fLgmUG5Oz8EXX300m2wOuU9qmffuzQvlCapV9zi9Upq31mT/ii38FVCmf1H06KOn+1WS MtepT7Tq+r3Cy2655YJ6TjGVwIzFvlmPM54yrkq6vft2nvTc/p/GSizFGYmGWsxFxYkAY4ni Tz8CAAA= Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 Reported-by: Sasha Levin Link: http://lkml.kernel.org/p/53E6CEAA.9020105@oracle.com Cc: stable # 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); } /*