From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751506AbbCTHx3 (ORCPT ); Fri, 20 Mar 2015 03:53:29 -0400 Received: from szxga02-in.huawei.com ([119.145.14.65]:43690 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751144AbbCTHxZ (ORCPT ); Fri, 20 Mar 2015 03:53:25 -0400 From: Wang Long To: , CC: , , , , , Subject: [PATCH] mm: Fix NULL pointer dereference in madvise(MADV_WILLNEED) support Date: Fri, 20 Mar 2015 07:49:04 +0000 Message-ID: <1426837744-203791-2-git-send-email-long.wanglong@huawei.com> X-Mailer: git-send-email 1.8.3.4 In-Reply-To: <1426837744-203791-1-git-send-email-long.wanglong@huawei.com> References: <1426837744-203791-1-git-send-email-long.wanglong@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.107.197.200] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Kirill A. Shutemov" commit ee53664bda169f519ce3c6a22d378f0b946c8178 upstream. Sasha Levin found a NULL pointer dereference that is due to a missing page table lock, which in turn is due to the pmd entry in question being a transparent huge-table entry. The code - introduced in commit 1998cc048901 ("mm: make madvise(MADV_WILLNEED) support swap file prefetch") - correctly checks for this situation using pmd_none_or_trans_huge_or_clear_bad(), but it turns out that that function doesn't work correctly. pmd_none_or_trans_huge_or_clear_bad() expected that pmd_bad() would trigger if the transparent hugepage bit was set, but it doesn't do that if pmd_numa() is also set. Note that the NUMA bit only gets set on real NUMA machines, so people trying to reproduce this on most normal development systems would never actually trigger this. Fix it by removing the very subtle (and subtly incorrect) expectation, and instead just checking pmd_trans_huge() explicitly. Reported-by: Sasha Levin Acked-by: Andrea Arcangeli [ Additionally remove the now stale test for pmd_trans_huge() inside the pmd_bad() case - Linus ] Signed-off-by: Linus Torvalds --- include/asm-generic/pgtable.h | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h index 17bccd3..dd6d9b8 100644 --- a/include/asm-generic/pgtable.h +++ b/include/asm-generic/pgtable.h @@ -550,11 +550,10 @@ static inline int pmd_none_or_trans_huge_or_clear_bad(pmd_t *pmd) #ifdef CONFIG_TRANSPARENT_HUGEPAGE barrier(); #endif - if (pmd_none(pmdval)) + if (pmd_none(pmdval) || pmd_trans_huge(pmdval)) return 1; if (unlikely(pmd_bad(pmdval))) { - if (!pmd_trans_huge(pmdval)) - pmd_clear_bad(pmd); + pmd_clear_bad(pmd); return 1; } return 0; -- 1.8.3.4