From patchwork Mon Aug 7 03:29:17 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Nicholas A. Bellinger" X-Patchwork-Id: 9884363 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id AA6CB60364 for ; Mon, 7 Aug 2017 03:23:23 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9E3841FE5F for ; Mon, 7 Aug 2017 03:23:23 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 92C082855A; Mon, 7 Aug 2017 03:23:23 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 256EE1FE5F for ; Mon, 7 Aug 2017 03:23:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751411AbdHGDXW (ORCPT ); Sun, 6 Aug 2017 23:23:22 -0400 Received: from mail.linux-iscsi.org ([67.23.28.174]:42847 "EHLO linux-iscsi.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751366AbdHGDXV (ORCPT ); Sun, 6 Aug 2017 23:23:21 -0400 Received: from linux-iscsi.org (localhost [127.0.0.1]) by linux-iscsi.org (Postfix) with ESMTP id BD21640B25; Mon, 7 Aug 2017 03:29:24 +0000 (UTC) From: "Nicholas A. Bellinger" To: target-devel Cc: stable , Greg-KH , Nicholas Bellinger , James Shen Subject: [PATCH-v3.18.y 1/5] target: Avoid mappedlun symlink creation during lun shutdown Date: Mon, 7 Aug 2017 03:29:17 +0000 Message-Id: <1502076561-20556-2-git-send-email-nab@linux-iscsi.org> X-Mailer: git-send-email 1.7.2.5 In-Reply-To: <1502076561-20556-1-git-send-email-nab@linux-iscsi.org> References: <1502076561-20556-1-git-send-email-nab@linux-iscsi.org> Sender: target-devel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: target-devel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Nicholas Bellinger commit 49cb77e297dc611a1b795cfeb79452b3002bd331 upstream. This patch closes a race between se_lun deletion during configfs unlink in target_fabric_port_unlink() -> core_dev_del_lun() -> core_tpg_remove_lun(), when transport_clear_lun_ref() blocks waiting for percpu_ref RCU grace period to finish, but a new NodeACL mappedlun is added before the RCU grace period has completed. This can happen in target_fabric_mappedlun_link() because it only checks for se_lun->lun_se_dev, which is not cleared until after transport_clear_lun_ref() percpu_ref RCU grace period finishes. This bug originally manifested as NULL pointer dereference OOPsen in target_stat_scsi_att_intr_port_show_attr_dev() on v4.1.y code, because it dereferences lun->lun_se_dev without a explicit NULL pointer check. In post v4.1 code with target-core RCU conversion, the code in target_stat_scsi_att_intr_port_show_attr_dev() no longer uses se_lun->lun_se_dev, but the same race still exists. To address the bug, go ahead and set se_lun>lun_shutdown as early as possible in core_tpg_remove_lun(), and ensure new NodeACL mappedlun creation in target_fabric_mappedlun_link() fails during se_lun shutdown. Reported-by: James Shen Cc: James Shen Tested-by: James Shen Signed-off-by: Nicholas Bellinger --- drivers/target/target_core_fabric_configfs.c | 5 +++++ drivers/target/target_core_tpg.c | 3 +++ include/target/target_core_base.h | 1 + 3 files changed, 9 insertions(+) diff --git a/drivers/target/target_core_fabric_configfs.c b/drivers/target/target_core_fabric_configfs.c index 0c3f901..54319d7 100644 --- a/drivers/target/target_core_fabric_configfs.c +++ b/drivers/target/target_core_fabric_configfs.c @@ -84,6 +84,11 @@ static int target_fabric_mappedlun_link( "_tpg does not exist\n"); return -EINVAL; } + if (lun->lun_shutdown) { + pr_err("Unable to create mappedlun symlink because" + " lun->lun_shutdown=true\n"); + return -EINVAL; + } se_tpg = lun->lun_sep->sep_tpg; nacl_ci = &lun_acl_ci->ci_parent->ci_group->cg_item; diff --git a/drivers/target/target_core_tpg.c b/drivers/target/target_core_tpg.c index 0696de9..5168186 100644 --- a/drivers/target/target_core_tpg.c +++ b/drivers/target/target_core_tpg.c @@ -843,6 +843,8 @@ void core_tpg_remove_lun( struct se_portal_group *tpg, struct se_lun *lun) { + lun->lun_shutdown = true; + core_clear_lun_from_tpg(lun, tpg); transport_clear_lun_ref(lun); @@ -850,6 +852,7 @@ void core_tpg_remove_lun( spin_lock(&tpg->tpg_lun_lock); lun->lun_status = TRANSPORT_LUN_STATUS_FREE; + lun->lun_shutdown = false; spin_unlock(&tpg->tpg_lun_lock); percpu_ref_exit(&lun->lun_ref); diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h index ad9ce86..d1e7cb9 100644 --- a/include/target/target_core_base.h +++ b/include/target/target_core_base.h @@ -719,6 +719,7 @@ struct se_lun { u32 lun_access; u32 lun_flags; u32 unpacked_lun; + bool lun_shutdown; atomic_t lun_acl_count; spinlock_t lun_acl_lock; spinlock_t lun_sep_lock;