From patchwork Tue Jul 20 10:49:05 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tetsuo Handa X-Patchwork-Id: 481684 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 295D7C636C9 for ; Tue, 20 Jul 2021 10:55:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 16335600D4 for ; Tue, 20 Jul 2021 10:55:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237924AbhGTKOf (ORCPT ); Tue, 20 Jul 2021 06:14:35 -0400 Received: from www262.sakura.ne.jp ([202.181.97.72]:52156 "EHLO www262.sakura.ne.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237572AbhGTKIy (ORCPT ); Tue, 20 Jul 2021 06:08:54 -0400 Received: from fsav414.sakura.ne.jp (fsav414.sakura.ne.jp [133.242.250.113]) by www262.sakura.ne.jp (8.15.2/8.15.2) with ESMTP id 16KAnHBg046137; Tue, 20 Jul 2021 19:49:17 +0900 (JST) (envelope-from penguin-kernel@I-love.SAKURA.ne.jp) Received: from www262.sakura.ne.jp (202.181.97.72) by fsav414.sakura.ne.jp (F-Secure/fsigk_smtp/550/fsav414.sakura.ne.jp); Tue, 20 Jul 2021 19:49:17 +0900 (JST) X-Virus-Status: clean(F-Secure/fsigk_smtp/550/fsav414.sakura.ne.jp) Received: from localhost.localdomain (M106072142033.v4.enabler.ne.jp [106.72.142.33]) (authenticated bits=0) by www262.sakura.ne.jp (8.15.2/8.15.2) with ESMTPSA id 16KAnApQ046122 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Tue, 20 Jul 2021 19:49:17 +0900 (JST) (envelope-from penguin-kernel@I-love.SAKURA.ne.jp) From: Tetsuo Handa To: Marcel Holtmann , Johan Hedberg , Luiz Augusto von Dentz Cc: linux-bluetooth@vger.kernel.org, LinMa , Tetsuo Handa Subject: [PATCH] Bluetooth: reorganize ioctls from hci_sock_bound_ioctl() Date: Tue, 20 Jul 2021 19:49:05 +0900 Message-Id: <20210720104905.6870-1-penguin-kernel@I-love.SAKURA.ne.jp> X-Mailer: git-send-email 2.18.4 Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org Since userfaultfd mechanism allows sleeping with kernel lock held, avoiding page fault with kernel lock held where possible will make the module more robust. This patch just brings copy_{from,to}_user() calls to out of hdev lock and sock lock. Signed-off-by: Tetsuo Handa --- include/net/bluetooth/hci_core.h | 3 +- net/bluetooth/hci_conn.c | 50 +--------- net/bluetooth/hci_sock.c | 165 ++++++++++++++++++++----------- 3 files changed, 108 insertions(+), 110 deletions(-) diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h index a53e94459ecd..d9e55682b908 100644 --- a/include/net/bluetooth/hci_core.h +++ b/include/net/bluetooth/hci_core.h @@ -1261,8 +1261,7 @@ int hci_dev_cmd(unsigned int cmd, void __user *arg); int hci_get_dev_list(void __user *arg); int hci_get_dev_info(void __user *arg); int hci_get_conn_list(void __user *arg); -int hci_get_conn_info(struct hci_dev *hdev, void __user *arg); -int hci_get_auth_info(struct hci_dev *hdev, void __user *arg); +u32 get_link_mode(struct hci_conn *conn); int hci_inquiry(void __user *arg); struct bdaddr_list *hci_bdaddr_list_lookup(struct list_head *list, diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c index 2b5059a56cda..41af11fadb74 100644 --- a/net/bluetooth/hci_conn.c +++ b/net/bluetooth/hci_conn.c @@ -1626,7 +1626,7 @@ void hci_conn_check_pending(struct hci_dev *hdev) hci_dev_unlock(hdev); } -static u32 get_link_mode(struct hci_conn *conn) +u32 get_link_mode(struct hci_conn *conn) { u32 link_mode = 0; @@ -1701,54 +1701,6 @@ int hci_get_conn_list(void __user *arg) return err ? -EFAULT : 0; } -int hci_get_conn_info(struct hci_dev *hdev, void __user *arg) -{ - struct hci_conn_info_req req; - struct hci_conn_info ci; - struct hci_conn *conn; - char __user *ptr = arg + sizeof(req); - - if (copy_from_user(&req, arg, sizeof(req))) - return -EFAULT; - - hci_dev_lock(hdev); - conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr); - if (conn) { - bacpy(&ci.bdaddr, &conn->dst); - ci.handle = conn->handle; - ci.type = conn->type; - ci.out = conn->out; - ci.state = conn->state; - ci.link_mode = get_link_mode(conn); - } - hci_dev_unlock(hdev); - - if (!conn) - return -ENOENT; - - return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0; -} - -int hci_get_auth_info(struct hci_dev *hdev, void __user *arg) -{ - struct hci_auth_info_req req; - struct hci_conn *conn; - - if (copy_from_user(&req, arg, sizeof(req))) - return -EFAULT; - - hci_dev_lock(hdev); - conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr); - if (conn) - req.type = conn->auth_type; - hci_dev_unlock(hdev); - - if (!conn) - return -ENOENT; - - return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0; -} - struct hci_chan *hci_chan_create(struct hci_conn *conn) { struct hci_dev *hdev = conn->hdev; diff --git a/net/bluetooth/hci_sock.c b/net/bluetooth/hci_sock.c index b04a5a02ecf3..ff78b79ee09d 100644 --- a/net/bluetooth/hci_sock.c +++ b/net/bluetooth/hci_sock.c @@ -892,82 +892,136 @@ static int hci_sock_release(struct socket *sock) return 0; } -static int hci_sock_reject_list_add(struct hci_dev *hdev, void __user *arg) +static int hci_sock_reject_list_add(struct hci_dev *hdev, bdaddr_t *bdaddr) { - bdaddr_t bdaddr; - int err; - - if (copy_from_user(&bdaddr, arg, sizeof(bdaddr))) - return -EFAULT; - - hci_dev_lock(hdev); - - err = hci_bdaddr_list_add(&hdev->reject_list, &bdaddr, BDADDR_BREDR); - - hci_dev_unlock(hdev); - - return err; + return hci_bdaddr_list_add(&hdev->reject_list, bdaddr, BDADDR_BREDR); } -static int hci_sock_reject_list_del(struct hci_dev *hdev, void __user *arg) +static int hci_sock_reject_list_del(struct hci_dev *hdev, bdaddr_t *bdaddr) { - bdaddr_t bdaddr; - int err; - - if (copy_from_user(&bdaddr, arg, sizeof(bdaddr))) - return -EFAULT; - - hci_dev_lock(hdev); + return hci_bdaddr_list_del(&hdev->reject_list, bdaddr, BDADDR_BREDR); +} - err = hci_bdaddr_list_del(&hdev->reject_list, &bdaddr, BDADDR_BREDR); +static int hci_get_conn_info(struct hci_dev *hdev, struct hci_conn_info_req *req, + struct hci_conn_info *ci) +{ + struct hci_conn *conn; + + conn = hci_conn_hash_lookup_ba(hdev, req->type, &req->bdaddr); + if (!conn) + return -ENOENT; + bacpy(&ci->bdaddr, &conn->dst); + ci->handle = conn->handle; + ci->type = conn->type; + ci->out = conn->out; + ci->state = conn->state; + ci->link_mode = get_link_mode(conn); + return 0; +} - hci_dev_unlock(hdev); +static int hci_get_auth_info(struct hci_dev *hdev, struct hci_auth_info_req *req) +{ + struct hci_conn *conn; - return err; + conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req->bdaddr); + if (!conn) + return -ENOENT; + req->type = conn->auth_type; + return 0; } /* Ioctls that require bound socket */ -static int hci_sock_bound_ioctl(struct sock *sk, unsigned int cmd, - unsigned long arg) +static int hci_sock_bound_ioctl(struct sock *sk, unsigned int cmd, void __user *arg) { - struct hci_dev *hdev = hci_pi(sk)->hdev; + struct hci_dev *hdev; + union { + bdaddr_t bdaddr; + struct hci_conn_info_req conn_req; + struct hci_auth_info_req auth_req; + } u; + struct hci_conn_info ci; + int err = 0; - if (!hdev) - return -EBADFD; + if (cmd == HCIBLOCKADDR || cmd == HCIUNBLOCKADDR) { + if (copy_from_user(&u.bdaddr, arg, sizeof(u.bdaddr))) + err = -EFAULT; + } else if (cmd == HCIGETCONNINFO) { + if (copy_from_user(&u.conn_req, arg, sizeof(u.conn_req))) + err = -EFAULT; + } else if (cmd == HCIGETAUTHINFO) { + if (copy_from_user(&u.auth_req, arg, sizeof(u.auth_req))) + err = -EFAULT; + } - if (hci_dev_test_flag(hdev, HCI_USER_CHANNEL)) - return -EBUSY; + lock_sock(sk); - if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED)) - return -EOPNOTSUPP; + hdev = hci_pi(sk)->hdev; + if (!hdev) { + err = -EBADFD; + goto out; + } - if (hdev->dev_type != HCI_PRIMARY) - return -EOPNOTSUPP; + if (hci_dev_test_flag(hdev, HCI_USER_CHANNEL)) { + err = -EBUSY; + goto out; + } + if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED)) { + err = -EOPNOTSUPP; + goto out; + } + + if (hdev->dev_type != HCI_PRIMARY) { + err = -EOPNOTSUPP; + goto out; + } + + hci_dev_lock(hdev); switch (cmd) { case HCISETRAW: if (!capable(CAP_NET_ADMIN)) - return -EPERM; - return -EOPNOTSUPP; - + err = -EPERM; + else + err = -EOPNOTSUPP; + break; case HCIGETCONNINFO: - return hci_get_conn_info(hdev, (void __user *)arg); - + if (!err) + err = hci_get_conn_info(hdev, &u.conn_req, &ci); + break; case HCIGETAUTHINFO: - return hci_get_auth_info(hdev, (void __user *)arg); - + if (!err) + err = hci_get_auth_info(hdev, &u.auth_req); + break; case HCIBLOCKADDR: if (!capable(CAP_NET_ADMIN)) - return -EPERM; - return hci_sock_reject_list_add(hdev, (void __user *)arg); - + err = -EPERM; + else if (!err) + err = hci_sock_reject_list_add(hdev, &u.bdaddr); + break; case HCIUNBLOCKADDR: if (!capable(CAP_NET_ADMIN)) - return -EPERM; - return hci_sock_reject_list_del(hdev, (void __user *)arg); + err = -EPERM; + else if (!err) + err = hci_sock_reject_list_del(hdev, &u.bdaddr); + break; + default: + err = -ENOIOCTLCMD; } + hci_dev_unlock(hdev); + + out: + release_sock(sk); - return -ENOIOCTLCMD; + if (!err) { + if (cmd == HCIGETCONNINFO) { + if (copy_to_user(arg + sizeof(u.conn_req), &ci, sizeof(ci))) + err = -EFAULT; + } else if (cmd == HCIGETAUTHINFO) { + if (copy_to_user(arg, &u.auth_req, sizeof(u.auth_req))) + err = -EFAULT; + } + } + return err; } static int hci_sock_ioctl(struct socket *sock, unsigned int cmd, @@ -975,15 +1029,14 @@ static int hci_sock_ioctl(struct socket *sock, unsigned int cmd, { void __user *argp = (void __user *)arg; struct sock *sk = sock->sk; - int err; BT_DBG("cmd %x arg %lx", cmd, arg); lock_sock(sk); if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) { - err = -EBADFD; - goto done; + release_sock(sk); + return -EBADFD; } /* When calling an ioctl on an unbound raw socket, then ensure @@ -1055,13 +1108,7 @@ static int hci_sock_ioctl(struct socket *sock, unsigned int cmd, return hci_inquiry(argp); } - lock_sock(sk); - - err = hci_sock_bound_ioctl(sk, cmd, arg); - -done: - release_sock(sk); - return err; + return hci_sock_bound_ioctl(sk, cmd, (void __user *)arg); } #ifdef CONFIG_COMPAT