From patchwork Fri Nov 6 22:17:21 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnd Bergmann X-Patchwork-Id: 322189 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=-13.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 36CE2C2D0A3 for ; Fri, 6 Nov 2020 22:22:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C7552206C1 for ; Fri, 6 Nov 2020 22:22:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604701329; bh=BR+zYR3Dm83q9tUsfJZzsFi0e5w5L0IGNArcvO9ow8I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=FdWurBG0E5qqZncdCseVxiKjuiool/UelJVEEZcMpeGOb5Zu9hFeG+vUQpam1S5Nv tIgsZK0F6a2xCr/am/u5BWgB6pCk7lBps2kdynWfGQh3KiDA9FSlkRLHesFWmG5CIY FHmA8H9DRz/7t/nXi6JjohO6M/xZgiH42EIe86ks= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729323AbgKFWWC (ORCPT ); Fri, 6 Nov 2020 17:22:02 -0500 Received: from mail.kernel.org ([198.145.29.99]:41460 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728828AbgKFWSN (ORCPT ); Fri, 6 Nov 2020 17:18:13 -0500 Received: from localhost.localdomain (HSI-KBW-46-223-126-90.hsi.kabel-badenwuerttemberg.de [46.223.126.90]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 6BE34206F9; Fri, 6 Nov 2020 22:18:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604701091; bh=BR+zYR3Dm83q9tUsfJZzsFi0e5w5L0IGNArcvO9ow8I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bi+lDzBo1ePiWdn/VM2k639J0e48uV9m25v+HdVm1B5ZrTJOGAAsnmK2eb1wd6bUC UaecT3Awtytx7aWt3xk23Z4rBeuTBeU7JtA2uQvht8OKRuLCMZ5q+WXJZ/bDwUKQmY ShaAoDaSb5UQRzAaWbQ2gN7MuG6UGmQPkHGImBo0= From: Arnd Bergmann To: netdev@vger.kernel.org Cc: Arnd Bergmann , linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org, bridge@lists.linux-foundation.org, linux-hams@vger.kernel.org, Jakub Kicinski , Christoph Hellwig , Alexander Viro , Johannes Berg , Andrew Lunn , Heiner Kallweit Subject: [RFC net-next 06/28] bridge: use ndo_siocdevprivate Date: Fri, 6 Nov 2020 23:17:21 +0100 Message-Id: <20201106221743.3271965-7-arnd@kernel.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20201106221743.3271965-1-arnd@kernel.org> References: <20201106221743.3271965-1-arnd@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Arnd Bergmann The bridge driver has an old set of ioctls using the SIOCDEVPRIVATE namespace that have never worked in compat mode and are explicitly forbidden already. Move them over to ndo_siocdevprivate and fix compat mode for these, because we can. Signed-off-by: Arnd Bergmann --- net/bridge/br_device.c | 1 + net/bridge/br_ioctl.c | 36 ++++++++++++++++++++++++------------ net/bridge/br_private.h | 2 ++ 3 files changed, 27 insertions(+), 12 deletions(-) diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c index 6f742fee874a..c272fa57110d 100644 --- a/net/bridge/br_device.c +++ b/net/bridge/br_device.c @@ -409,6 +409,7 @@ static const struct net_device_ops br_netdev_ops = { .ndo_change_rx_flags = br_dev_change_rx_flags, .ndo_change_mtu = br_change_mtu, .ndo_do_ioctl = br_dev_ioctl, + .ndo_siocdevprivate = br_dev_siocdevprivate, #ifdef CONFIG_NET_POLL_CONTROLLER .ndo_netpoll_setup = br_netpoll_setup, .ndo_netpoll_cleanup = br_netpoll_cleanup, diff --git a/net/bridge/br_ioctl.c b/net/bridge/br_ioctl.c index 2db800fc27ca..7fbfeb735bad 100644 --- a/net/bridge/br_ioctl.c +++ b/net/bridge/br_ioctl.c @@ -106,15 +106,31 @@ static int add_del_if(struct net_bridge *br, int ifindex, int isadd) * This interface is deprecated because it was too difficult * to do the translation for 32/64bit ioctl compatibility. */ -static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) +int br_dev_siocdevprivate(struct net_device *dev, struct ifreq *rq, void __user *data, int cmd) { struct net_bridge *br = netdev_priv(dev); struct net_bridge_port *p = NULL; unsigned long args[4]; + void __user *argp; int ret = -EOPNOTSUPP; - if (copy_from_user(args, rq->ifr_data, sizeof(args))) - return -EFAULT; + if (in_compat_syscall()) { + unsigned int cargs[4]; + if (copy_from_user(cargs, data, sizeof(cargs))) + return -EFAULT; + + args[0] = cargs[0]; + args[1] = cargs[1]; + args[2] = cargs[2]; + args[3] = cargs[3]; + + argp = compat_ptr(args[1]); + } else { + if (copy_from_user(args, data, sizeof(args))) + return -EFAULT; + + argp = (void __user *)args[1]; + } switch (args[0]) { case BRCTL_ADD_IF: @@ -171,7 +187,7 @@ static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) return -ENOMEM; get_port_ifindices(br, indices, num); - if (copy_to_user((void __user *)args[1], indices, num*sizeof(int))) + if (copy_to_user(argp, indices, num*sizeof(int))) num = -EFAULT; kfree(indices); return num; @@ -232,7 +248,7 @@ static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) rcu_read_unlock(); - if (copy_to_user((void __user *)args[1], &p, sizeof(p))) + if (copy_to_user(argp, &p, sizeof(p))) return -EFAULT; return 0; @@ -282,8 +298,7 @@ static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) } case BRCTL_GET_FDB_ENTRIES: - return get_fdb_entries(br, (void __user *)args[1], - args[2], args[3]); + return get_fdb_entries(br, argp, args[2], args[3]); } if (!ret) { @@ -320,7 +335,7 @@ static int old_deviceless(struct net *net, void __user *uarg) args[2] = get_bridge_ifindices(net, indices, args[2]); - ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int)) + ret = copy_to_user(uarg, indices, args[2]*sizeof(int)) ? -EFAULT : args[2]; kfree(indices); @@ -335,7 +350,7 @@ static int old_deviceless(struct net *net, void __user *uarg) if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) return -EPERM; - if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ)) + if (copy_from_user(buf, uarg, IFNAMSIZ)) return -EFAULT; buf[IFNAMSIZ-1] = 0; @@ -383,9 +398,6 @@ int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) struct net_bridge *br = netdev_priv(dev); switch (cmd) { - case SIOCDEVPRIVATE: - return old_dev_ioctl(dev, rq, cmd); - case SIOCBRADDIF: case SIOCBRDELIF: return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF); diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h index 345118e35c42..a788fcdd2adf 100644 --- a/net/bridge/br_private.h +++ b/net/bridge/br_private.h @@ -778,6 +778,8 @@ br_port_get_check_rtnl(const struct net_device *dev) /* br_ioctl.c */ int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); +int br_dev_siocdevprivate(struct net_device *dev, struct ifreq *rq, + void __user *data, int cmd); int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *arg);