From mboxrd@z Thu Jan 1 00:00:00 1970 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=-10.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 D1829C49ED7 for ; Fri, 13 Sep 2019 13:19:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A691920717 for ; Fri, 13 Sep 2019 13:19:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1568380741; bh=hOxgvApp/1gfEFAkPo+InjWQiHi/zzIKADkmRTtA6vM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=qeL9Fl2JQHZZDr95OWNSVX0gf1wjKBcQyEz+RHIrSxPQPdpPATo1QPbW9OInUk7e2 MhKExOSGTZSoHnYbBV5OLlAiE1VThtmHNI6sR2KICpKWL9SL6J6IYwlMX/IaVu/NJ1 /3ePRhU0aR+dtorCSZQlziFW5HP9rX06mbIwUBbA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390338AbfIMNTA (ORCPT ); Fri, 13 Sep 2019 09:19:00 -0400 Received: from mail.kernel.org ([198.145.29.99]:46748 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390322AbfIMNS4 (ORCPT ); Fri, 13 Sep 2019 09:18:56 -0400 Received: from localhost (unknown [104.132.45.99]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id A7A2E20717; Fri, 13 Sep 2019 13:18:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1568380736; bh=hOxgvApp/1gfEFAkPo+InjWQiHi/zzIKADkmRTtA6vM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GFBbK+aP1pvRXqsOgQEpoPXeI0QTICive7aYjf/sJK/gh75SfjL6PkLgiHeFp2BkY Fxkbtr7PrIAIO1t175XERKouFiLWoPQPgD7c6TXnPxQeqCQ2vFnEy72BRi4jNxGu6J PxdIRBUdt3fa1ozgNiPJ0zj6L1mcdn9hPX2/G3Vs= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ronnie Sahlberg , Steve French , Pavel Shilovsky , Sasha Levin Subject: [PATCH 4.19 140/190] cifs: add spinlock for the openFileList to cifsInodeInfo Date: Fri, 13 Sep 2019 14:06:35 +0100 Message-Id: <20190913130611.187003688@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20190913130559.669563815@linuxfoundation.org> References: <20190913130559.669563815@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [ Upstream commit 487317c99477d00f22370625d53be3239febabbe ] We can not depend on the tcon->open_file_lock here since in multiuser mode we may have the same file/inode open via multiple different tcons. The current code is race prone and will crash if one user deletes a file at the same time a different user opens/create the file. To avoid this we need to have a spinlock attached to the inode and not the tcon. RHBZ: 1580165 CC: Stable Signed-off-by: Ronnie Sahlberg Signed-off-by: Steve French Reviewed-by: Pavel Shilovsky Signed-off-by: Sasha Levin --- fs/cifs/cifsfs.c | 1 + fs/cifs/cifsglob.h | 5 +++++ fs/cifs/file.c | 8 ++++++-- 3 files changed, 12 insertions(+), 2 deletions(-) diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c index fb32f3d6925e8..64e3888f30e6d 100644 --- a/fs/cifs/cifsfs.c +++ b/fs/cifs/cifsfs.c @@ -292,6 +292,7 @@ cifs_alloc_inode(struct super_block *sb) cifs_inode->uniqueid = 0; cifs_inode->createtime = 0; cifs_inode->epoch = 0; + spin_lock_init(&cifs_inode->open_file_lock); generate_random_uuid(cifs_inode->lease_key); /* diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h index 0ee0072c1f362..57af9bac0045a 100644 --- a/fs/cifs/cifsglob.h +++ b/fs/cifs/cifsglob.h @@ -1287,6 +1287,7 @@ struct cifsInodeInfo { struct rw_semaphore lock_sem; /* protect the fields above */ /* BB add in lists for dirty pages i.e. write caching info for oplock */ struct list_head openFileList; + spinlock_t open_file_lock; /* protects openFileList */ __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */ unsigned int oplock; /* oplock/lease level we have */ unsigned int epoch; /* used to track lease state changes */ @@ -1687,10 +1688,14 @@ require use of the stronger protocol */ * tcp_ses_lock protects: * list operations on tcp and SMB session lists * tcon->open_file_lock protects the list of open files hanging off the tcon + * inode->open_file_lock protects the openFileList hanging off the inode * cfile->file_info_lock protects counters and fields in cifs file struct * f_owner.lock protects certain per file struct operations * mapping->page_lock protects certain per page operations * + * Note that the cifs_tcon.open_file_lock should be taken before + * not after the cifsInodeInfo.open_file_lock + * * Semaphores * ---------- * sesSem operations on smb session diff --git a/fs/cifs/file.c b/fs/cifs/file.c index 933013543edab..8703b5f26f452 100644 --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -336,10 +336,12 @@ cifs_new_fileinfo(struct cifs_fid *fid, struct file *file, list_add(&cfile->tlist, &tcon->openFileList); /* if readable file instance put first in list*/ + spin_lock(&cinode->open_file_lock); if (file->f_mode & FMODE_READ) list_add(&cfile->flist, &cinode->openFileList); else list_add_tail(&cfile->flist, &cinode->openFileList); + spin_unlock(&cinode->open_file_lock); spin_unlock(&tcon->open_file_lock); if (fid->purge_cache) @@ -411,7 +413,9 @@ void _cifsFileInfo_put(struct cifsFileInfo *cifs_file, bool wait_oplock_handler) cifs_add_pending_open_locked(&fid, cifs_file->tlink, &open); /* remove it from the lists */ + spin_lock(&cifsi->open_file_lock); list_del(&cifs_file->flist); + spin_unlock(&cifsi->open_file_lock); list_del(&cifs_file->tlist); if (list_empty(&cifsi->openFileList)) { @@ -1929,10 +1933,10 @@ refind_writable: if (!rc) return inv_file; else { - spin_lock(&tcon->open_file_lock); + spin_lock(&cifs_inode->open_file_lock); list_move_tail(&inv_file->flist, &cifs_inode->openFileList); - spin_unlock(&tcon->open_file_lock); + spin_unlock(&cifs_inode->open_file_lock); cifsFileInfo_put(inv_file); ++refind; inv_file = NULL; -- 2.20.1