From patchwork Tue Dec 29 23:14:25 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Morton X-Patchwork-Id: 354204 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 118EAC433E0 for ; Tue, 29 Dec 2020 23:15:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D927B223E0 for ; Tue, 29 Dec 2020 23:15:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726178AbgL2XPH (ORCPT ); Tue, 29 Dec 2020 18:15:07 -0500 Received: from mail.kernel.org ([198.145.29.99]:37030 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726156AbgL2XPH (ORCPT ); Tue, 29 Dec 2020 18:15:07 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id E4E5422209; Tue, 29 Dec 2020 23:14:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1609283666; bh=TPefhq1IQ6Ydg9RmnRnQ0UdzaerzCpneCtncq1JZszM=; h=Date:From:To:Subject:In-Reply-To:From; b=JQTVI6zliLvtXuA2AT2UwToYPSXqLwBrVYG3SEuQnMkF9C4l9GHtsntuSnr5B30LI 2ndO/bJhH5s/bWRAdHk6JmPBnWd5mzsRV/UbI+bcCvrAUsPxIhGF7UwHEW8Ojw/EXl kVqYA5fT9uS3yA7Zy/oUdxEhMQPnGOE2R51W5uv8= Date: Tue, 29 Dec 2020 15:14:25 -0800 From: Andrew Morton To: akpm@linux-foundation.org, aneesh.kumar@linux.vnet.ibm.com, dave@stgolabs.net, hughd@google.com, linux-mm@kvack.org, mhocko@kernel.org, mike.kravetz@oracle.com, mm-commits@vger.kernel.org, n-horiguchi@ah.jp.nec.com, stable@vger.kernel.org, torvalds@linux-foundation.org Subject: [patch 02/16] mm/hugetlb: fix deadlock in hugetlb_cow error path Message-ID: <20201229231425.rmDpurdQ4%akpm@linux-foundation.org> In-Reply-To: <20201229151349.3285926ec0d1f65a27ac8534@linux-foundation.org> User-Agent: s-nail v14.8.16 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Mike Kravetz Subject: mm/hugetlb: fix deadlock in hugetlb_cow error path syzbot reported the deadlock here [1]. The issue is in hugetlb cow error handling when there are not enough huge pages for the faulting task which took the original reservation. It is possible that other (child) tasks could have consumed pages associated with the reservation. In this case, we want the task which took the original reservation to succeed. So, we unmap any associated pages in children so that they can be used by the faulting task that owns the reservation. The unmapping code needs to hold i_mmap_rwsem in write mode. However, due to commit c0d0381ade79 ("hugetlbfs: use i_mmap_rwsem for more pmd sharing synchronization") we are already holding i_mmap_rwsem in read mode when hugetlb_cow is called. Technically, i_mmap_rwsem does not need to be held in read mode for COW mappings as they can not share pmd's. Modifying the fault code to not take i_mmap_rwsem in read mode for COW (and other non-sharable) mappings is too involved for a stable fix. Instead, we simply drop the hugetlb_fault_mutex and i_mmap_rwsem before unmapping. This is OK as it is technically not needed. They are reacquired after unmapping as expected by calling code. Since this is done in an uncommon error path, the overhead of dropping and reacquiring mutexes is acceptable. While making changes, remove redundant BUG_ON after unmap_ref_private. [1] https://lkml.kernel.org/r/000000000000b73ccc05b5cf8558@google.com Link: https://lkml.kernel.org/r/4c5781b8-3b00-761e-c0c7-c5edebb6ec1a@oracle.com Fixes: c0d0381ade79 ("hugetlbfs: use i_mmap_rwsem for more pmd sharing synchronization") Signed-off-by: Mike Kravetz Reported-by: syzbot+5eee4145df3c15e96625@syzkaller.appspotmail.com Cc: Naoya Horiguchi Cc: Michal Hocko Cc: Hugh Dickins Cc: "Aneesh Kumar K . V" Cc: Davidlohr Bueso Cc: Signed-off-by: Andrew Morton --- mm/hugetlb.c | 22 +++++++++++++++++++++- 1 file changed, 21 insertions(+), 1 deletion(-) --- a/mm/hugetlb.c~mm-hugetlb-fix-deadlock-in-hugetlb_cow-error-path +++ a/mm/hugetlb.c @@ -4105,10 +4105,30 @@ retry_avoidcopy: * may get SIGKILLed if it later faults. */ if (outside_reserve) { + struct address_space *mapping = vma->vm_file->f_mapping; + pgoff_t idx; + u32 hash; + put_page(old_page); BUG_ON(huge_pte_none(pte)); + /* + * Drop hugetlb_fault_mutex and i_mmap_rwsem before + * unmapping. unmapping needs to hold i_mmap_rwsem + * in write mode. Dropping i_mmap_rwsem in read mode + * here is OK as COW mappings do not interact with + * PMD sharing. + * + * Reacquire both after unmap operation. + */ + idx = vma_hugecache_offset(h, vma, haddr); + hash = hugetlb_fault_mutex_hash(mapping, idx); + mutex_unlock(&hugetlb_fault_mutex_table[hash]); + i_mmap_unlock_read(mapping); + unmap_ref_private(mm, vma, old_page, haddr); - BUG_ON(huge_pte_none(pte)); + + i_mmap_lock_read(mapping); + mutex_lock(&hugetlb_fault_mutex_table[hash]); spin_lock(ptl); ptep = huge_pte_offset(mm, haddr, huge_page_size(h)); if (likely(ptep &&