From patchwork Mon Aug 27 19:45:15 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Christie X-Patchwork-Id: 10577533 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 34428139B for ; Mon, 27 Aug 2018 19:45:21 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 26D6B2A0EA for ; Mon, 27 Aug 2018 19:45:21 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1B3A62A0FD; Mon, 27 Aug 2018 19:45:21 +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=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, 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 A0DCA29349 for ; Mon, 27 Aug 2018 19:45:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727058AbeH0XdU (ORCPT ); Mon, 27 Aug 2018 19:33:20 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:59250 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727023AbeH0XdU (ORCPT ); Mon, 27 Aug 2018 19:33:20 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id D189A88846; Mon, 27 Aug 2018 19:45:18 +0000 (UTC) Received: from rh2.redhat.com (ovpn-123-78.rdu2.redhat.com [10.10.123.78]) by smtp.corp.redhat.com (Postfix) with ESMTP id 57B992027EA0; Mon, 27 Aug 2018 19:45:18 +0000 (UTC) From: Mike Christie To: willy@infradead.org, martin.petersen@oracle.com, linux-scsi@vger.kernel.org, target-devel@vger.kernel.org, nab@linux-iscsi.org Cc: Vincent Pelletier , Mike Christie Subject: [PATCH 1/2] iscsi target: Set conn->sess to NULL when iscsi_login_set_conn_values fails Date: Mon, 27 Aug 2018 14:45:15 -0500 Message-Id: <1535399116-15138-2-git-send-email-mchristi@redhat.com> In-Reply-To: <1535399116-15138-1-git-send-email-mchristi@redhat.com> References: <1535399116-15138-1-git-send-email-mchristi@redhat.com> X-Scanned-By: MIMEDefang 2.78 on 10.11.54.4 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.2]); Mon, 27 Aug 2018 19:45:18 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.2]); Mon, 27 Aug 2018 19:45:18 +0000 (UTC) for IP:'10.11.54.4' DOMAIN:'int-mx04.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'mchristi@redhat.com' RCPT:'' 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: Vincent Pelletier Fixes a use-after-free reported by KASAN when later iscsi_target_login_sess_out gets called and it tries to access conn->sess->se_sess: Disabling lock debugging due to kernel taint iSCSI Login timeout on Network Portal [::]:3260 iSCSI Login negotiation failed. Reviewed-by: Matthew Wilcox ================================================================== BUG: KASAN: use-after-free in iscsi_target_login_sess_out.cold.12+0x58/0xff [iscsi_target_mod] Read of size 8 at addr ffff880109d070c8 by task iscsi_np/980 CPU: 1 PID: 980 Comm: iscsi_np Tainted: G O 4.17.8kasan.sess.connops+ #4 Hardware name: To be filled by O.E.M. To be filled by O.E.M./Aptio CRB, BIOS 5.6.5 05/19/2014 Call Trace: dump_stack+0x71/0xac print_address_description+0x65/0x22e ? iscsi_target_login_sess_out.cold.12+0x58/0xff [iscsi_target_mod] kasan_report.cold.6+0x241/0x2fd iscsi_target_login_sess_out.cold.12+0x58/0xff [iscsi_target_mod] iscsi_target_login_thread+0x1086/0x1710 [iscsi_target_mod] ? __sched_text_start+0x8/0x8 ? iscsi_target_login_sess_out+0x250/0x250 [iscsi_target_mod] ? __kthread_parkme+0xcc/0x100 ? parse_args.cold.14+0xd3/0xd3 ? iscsi_target_login_sess_out+0x250/0x250 [iscsi_target_mod] kthread+0x1a0/0x1c0 ? kthread_bind+0x30/0x30 ret_from_fork+0x35/0x40 Allocated by task 980: kasan_kmalloc+0xbf/0xe0 kmem_cache_alloc_trace+0x112/0x210 iscsi_target_login_thread+0x816/0x1710 [iscsi_target_mod] kthread+0x1a0/0x1c0 ret_from_fork+0x35/0x40 Freed by task 980: __kasan_slab_free+0x125/0x170 kfree+0x90/0x1d0 iscsi_target_login_thread+0x1577/0x1710 [iscsi_target_mod] kthread+0x1a0/0x1c0 ret_from_fork+0x35/0x40 The buggy address belongs to the object at ffff880109d06f00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 456 bytes inside of 512-byte region [ffff880109d06f00, ffff880109d07100) The buggy address belongs to the page: page:ffffea0004274180 count:1 mapcount:0 mapping:0000000000000000 index:0x0 compound_mapcount: 0 flags: 0x17fffc000008100(slab|head) raw: 017fffc000008100 0000000000000000 0000000000000000 00000001000c000c raw: dead000000000100 dead000000000200 ffff88011b002e00 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff880109d06f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff880109d07000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff880109d07080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff880109d07100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff880109d07180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== Signed-off-by: Vincent Pelletier [rebased against idr/ida changes and to handle ret review comments from Matthew] Signed-off-by: Mike Christie Cc: Matthew Wilcox --- v2: - Rebase against Linus's tree with idr/ida changes. - Always return -ENOMEM on failure because caller does not care and to simplify the code. drivers/target/iscsi/iscsi_target_login.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/drivers/target/iscsi/iscsi_target_login.c b/drivers/target/iscsi/iscsi_target_login.c index 9e74f8b..f58b9c1 100644 --- a/drivers/target/iscsi/iscsi_target_login.c +++ b/drivers/target/iscsi/iscsi_target_login.c @@ -310,11 +310,9 @@ static int iscsi_login_zero_tsih_s1( return -ENOMEM; } - ret = iscsi_login_set_conn_values(sess, conn, pdu->cid); - if (unlikely(ret)) { - kfree(sess); - return ret; - } + if (iscsi_login_set_conn_values(sess, conn, pdu->cid)) + goto free_sess; + sess->init_task_tag = pdu->itt; memcpy(&sess->isid, pdu->isid, 6); sess->exp_cmd_sn = be32_to_cpu(pdu->cmdsn); From patchwork Mon Aug 27 19:45:16 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Christie X-Patchwork-Id: 10577539 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0D96C1803 for ; Mon, 27 Aug 2018 19:45:23 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F421C29349 for ; Mon, 27 Aug 2018 19:45:22 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E7B002A0EA; Mon, 27 Aug 2018 19:45:22 +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=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable 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 D3D1929349 for ; Mon, 27 Aug 2018 19:45:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727023AbeH0XdU (ORCPT ); Mon, 27 Aug 2018 19:33:20 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:38292 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726994AbeH0XdU (ORCPT ); Mon, 27 Aug 2018 19:33:20 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 615D9400738B; Mon, 27 Aug 2018 19:45:19 +0000 (UTC) Received: from rh2.redhat.com (ovpn-123-78.rdu2.redhat.com [10.10.123.78]) by smtp.corp.redhat.com (Postfix) with ESMTP id E750D2027EA0; Mon, 27 Aug 2018 19:45:18 +0000 (UTC) From: Mike Christie To: willy@infradead.org, martin.petersen@oracle.com, linux-scsi@vger.kernel.org, target-devel@vger.kernel.org, nab@linux-iscsi.org Cc: Mike Christie Subject: [PATCH 2/2] iscsi target: fix conn_ops double free Date: Mon, 27 Aug 2018 14:45:16 -0500 Message-Id: <1535399116-15138-3-git-send-email-mchristi@redhat.com> In-Reply-To: <1535399116-15138-1-git-send-email-mchristi@redhat.com> References: <1535399116-15138-1-git-send-email-mchristi@redhat.com> X-Scanned-By: MIMEDefang 2.78 on 10.11.54.4 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.6]); Mon, 27 Aug 2018 19:45:19 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.6]); Mon, 27 Aug 2018 19:45:19 +0000 (UTC) for IP:'10.11.54.4' DOMAIN:'int-mx04.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'mchristi@redhat.com' RCPT:'' 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 If iscsi_login_init_conn fails it can free conn_ops. __iscsi_target_login_thread will then call iscsi_target_login_sess_out which will also free it. This fixes the problem by organizing conn allocation/setup into parts that are needed through the life of the conn and parts that are only needed for the login. The free functions then release what was allocated in the alloc functions. With this patch we have: iscsit_alloc_conn/iscsit_free_conn - allocs/frees the conn we need for the entire life of the conn. iscsi_login_init_conn/iscsi_target_nego_release - allocs/frees the parts of the conn that are only needed during login. Signed-off-by: Mike Christie --- drivers/target/iscsi/iscsi_target.c | 9 +- drivers/target/iscsi/iscsi_target_login.c | 141 ++++++++++++++++-------------- drivers/target/iscsi/iscsi_target_login.h | 2 +- 3 files changed, 77 insertions(+), 75 deletions(-) diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c index 94bad43..9cdfccb 100644 --- a/drivers/target/iscsi/iscsi_target.c +++ b/drivers/target/iscsi/iscsi_target.c @@ -4208,22 +4208,15 @@ int iscsit_close_connection( crypto_free_ahash(tfm); } - free_cpumask_var(conn->conn_cpumask); - - kfree(conn->conn_ops); - conn->conn_ops = NULL; - if (conn->sock) sock_release(conn->sock); if (conn->conn_transport->iscsit_free_conn) conn->conn_transport->iscsit_free_conn(conn); - iscsit_put_transport(conn->conn_transport); - pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); conn->conn_state = TARG_CONN_STATE_FREE; - kfree(conn); + iscsit_free_conn(conn); spin_lock_bh(&sess->conn_lock); atomic_dec(&sess->nconn); diff --git a/drivers/target/iscsi/iscsi_target_login.c b/drivers/target/iscsi/iscsi_target_login.c index f58b9c1..bb90c80 100644 --- a/drivers/target/iscsi/iscsi_target_login.c +++ b/drivers/target/iscsi/iscsi_target_login.c @@ -67,45 +67,10 @@ static struct iscsi_login *iscsi_login_init_conn(struct iscsi_conn *conn) goto out_req_buf; } - conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL); - if (!conn->conn_ops) { - pr_err("Unable to allocate memory for" - " struct iscsi_conn_ops.\n"); - goto out_rsp_buf; - } - - init_waitqueue_head(&conn->queues_wq); - INIT_LIST_HEAD(&conn->conn_list); - INIT_LIST_HEAD(&conn->conn_cmd_list); - INIT_LIST_HEAD(&conn->immed_queue_list); - INIT_LIST_HEAD(&conn->response_queue_list); - init_completion(&conn->conn_post_wait_comp); - init_completion(&conn->conn_wait_comp); - init_completion(&conn->conn_wait_rcfr_comp); - init_completion(&conn->conn_waiting_on_uc_comp); - init_completion(&conn->conn_logout_comp); - init_completion(&conn->rx_half_close_comp); - init_completion(&conn->tx_half_close_comp); - init_completion(&conn->rx_login_comp); - spin_lock_init(&conn->cmd_lock); - spin_lock_init(&conn->conn_usage_lock); - spin_lock_init(&conn->immed_queue_lock); - spin_lock_init(&conn->nopin_timer_lock); - spin_lock_init(&conn->response_queue_lock); - spin_lock_init(&conn->state_lock); - - if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) { - pr_err("Unable to allocate conn->conn_cpumask\n"); - goto out_conn_ops; - } conn->conn_login = login; return login; -out_conn_ops: - kfree(conn->conn_ops); -out_rsp_buf: - kfree(login->rsp_buf); out_req_buf: kfree(login->req_buf); out_login: @@ -1147,6 +1112,75 @@ iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t) return 0; } +static struct iscsi_conn *iscsit_alloc_conn(struct iscsi_np *np) +{ + struct iscsi_conn *conn; + + conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL); + if (!conn) { + pr_err("Could not allocate memory for new connection\n"); + return NULL; + } + pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); + conn->conn_state = TARG_CONN_STATE_FREE; + + init_waitqueue_head(&conn->queues_wq); + INIT_LIST_HEAD(&conn->conn_list); + INIT_LIST_HEAD(&conn->conn_cmd_list); + INIT_LIST_HEAD(&conn->immed_queue_list); + INIT_LIST_HEAD(&conn->response_queue_list); + init_completion(&conn->conn_post_wait_comp); + init_completion(&conn->conn_wait_comp); + init_completion(&conn->conn_wait_rcfr_comp); + init_completion(&conn->conn_waiting_on_uc_comp); + init_completion(&conn->conn_logout_comp); + init_completion(&conn->rx_half_close_comp); + init_completion(&conn->tx_half_close_comp); + init_completion(&conn->rx_login_comp); + spin_lock_init(&conn->cmd_lock); + spin_lock_init(&conn->conn_usage_lock); + spin_lock_init(&conn->immed_queue_lock); + spin_lock_init(&conn->nopin_timer_lock); + spin_lock_init(&conn->response_queue_lock); + spin_lock_init(&conn->state_lock); + + timer_setup(&conn->nopin_response_timer, + iscsit_handle_nopin_response_timeout, 0); + timer_setup(&conn->nopin_timer, iscsit_handle_nopin_timeout, 0); + + if (iscsit_conn_set_transport(conn, np->np_transport) < 0) + goto free_conn; + + conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL); + if (!conn->conn_ops) { + pr_err("Unable to allocate memory for struct iscsi_conn_ops.\n"); + goto put_transport; + } + + if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) { + pr_err("Unable to allocate conn->conn_cpumask\n"); + goto free_mask; + } + + return conn; + +free_mask: + free_cpumask_var(conn->conn_cpumask); +put_transport: + iscsit_put_transport(conn->conn_transport); +free_conn: + kfree(conn); + return NULL; +} + +void iscsit_free_conn(struct iscsi_conn *conn) +{ + free_cpumask_var(conn->conn_cpumask); + kfree(conn->conn_ops); + iscsit_put_transport(conn->conn_transport); + kfree(conn); +} + void iscsi_target_login_sess_out(struct iscsi_conn *conn, struct iscsi_np *np, bool zero_tsih, bool new_sess) { @@ -1196,10 +1230,6 @@ void iscsi_target_login_sess_out(struct iscsi_conn *conn, crypto_free_ahash(tfm); } - free_cpumask_var(conn->conn_cpumask); - - kfree(conn->conn_ops); - if (conn->param_list) { iscsi_release_param_list(conn->param_list); conn->param_list = NULL; @@ -1217,8 +1247,7 @@ void iscsi_target_login_sess_out(struct iscsi_conn *conn, if (conn->conn_transport->iscsit_free_conn) conn->conn_transport->iscsit_free_conn(conn); - iscsit_put_transport(conn->conn_transport); - kfree(conn); + iscsit_free_conn(conn); } static int __iscsi_target_login_thread(struct iscsi_np *np) @@ -1248,31 +1277,16 @@ static int __iscsi_target_login_thread(struct iscsi_np *np) } spin_unlock_bh(&np->np_thread_lock); - conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL); + conn = iscsit_alloc_conn(np); if (!conn) { - pr_err("Could not allocate memory for" - " new connection\n"); /* Get another socket */ return 1; } - pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); - conn->conn_state = TARG_CONN_STATE_FREE; - - timer_setup(&conn->nopin_response_timer, - iscsit_handle_nopin_response_timeout, 0); - timer_setup(&conn->nopin_timer, iscsit_handle_nopin_timeout, 0); - - if (iscsit_conn_set_transport(conn, np->np_transport) < 0) { - kfree(conn); - return 1; - } rc = np->np_transport->iscsit_accept_np(np, conn); if (rc == -ENOSYS) { complete(&np->np_restart_comp); - iscsit_put_transport(conn->conn_transport); - kfree(conn); - conn = NULL; + iscsit_free_conn(conn); goto exit; } else if (rc < 0) { spin_lock_bh(&np->np_thread_lock); @@ -1280,17 +1294,13 @@ static int __iscsi_target_login_thread(struct iscsi_np *np) np->np_thread_state = ISCSI_NP_THREAD_ACTIVE; spin_unlock_bh(&np->np_thread_lock); complete(&np->np_restart_comp); - iscsit_put_transport(conn->conn_transport); - kfree(conn); - conn = NULL; + iscsit_free_conn(conn); /* Get another socket */ return 1; } spin_unlock_bh(&np->np_thread_lock); - iscsit_put_transport(conn->conn_transport); - kfree(conn); - conn = NULL; - goto out; + iscsit_free_conn(conn); + return 1; } /* * Perform the remaining iSCSI connection initialization items.. @@ -1440,7 +1450,6 @@ static int __iscsi_target_login_thread(struct iscsi_np *np) tpg_np = NULL; } -out: return 1; exit: diff --git a/drivers/target/iscsi/iscsi_target_login.h b/drivers/target/iscsi/iscsi_target_login.h index 74ac3ab..3b8e363 100644 --- a/drivers/target/iscsi/iscsi_target_login.h +++ b/drivers/target/iscsi/iscsi_target_login.h @@ -19,7 +19,7 @@ extern int iscsi_target_setup_login_socket(struct iscsi_np *, extern int iscsit_accept_np(struct iscsi_np *, struct iscsi_conn *); extern int iscsit_get_login_rx(struct iscsi_conn *, struct iscsi_login *); extern int iscsit_put_login_tx(struct iscsi_conn *, struct iscsi_login *, u32); -extern void iscsit_free_conn(struct iscsi_np *, struct iscsi_conn *); +extern void iscsit_free_conn(struct iscsi_conn *); extern int iscsit_start_kthreads(struct iscsi_conn *); extern void iscsi_post_login_handler(struct iscsi_np *, struct iscsi_conn *, u8); extern void iscsi_target_login_sess_out(struct iscsi_conn *, struct iscsi_np *,