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=-9.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 2746BC433DF for ; Thu, 14 May 2020 14:45:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E9AAF20727 for ; Thu, 14 May 2020 14:45:50 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="lX99B1uR" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728047AbgENOpu (ORCPT ); Thu, 14 May 2020 10:45:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37976 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726763AbgENOpt (ORCPT ); Thu, 14 May 2020 10:45:49 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 69A30C061A0F; Thu, 14 May 2020 07:45:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=2BVQNCsHDXBi7WB9eP+yVXJsjaG+q+SsuFZ3NmsMQQw=; b=lX99B1uRP3pYmKlIgzDP5dMwJd 4sl6qkveBzbWRcCpWh6rKL+2GmtW305SQ5q5U9RfPnEP4ILAaHpnO356HJu0e3lzvilfuf1DilPIF XaElNNUtP5CfvwQMzwDHxtl3E1mjT5MN0ExENrMVuOjSeCMh3cAWsixJqTwLDCGEGXpfyrzV9GSrN 2JJDuVyT6vCsiuF4r2E1Y2PxeaMbrMOA6UBs2JCbjLetLRYADWLU97RIjRQrrFtcDorjf9TLzRk7m +ht9UdxNhLPRJ3FpEaKwD/bDtoEmAqjnr3Av33/YrGiyQfxQA9D4WvOAp40UjepwQNqrzArNqjVQY gsAAgk0A==; Received: from [2001:4bb8:188:1506:c70:4a89:bc61:2] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jZF7E-0004dC-31; Thu, 14 May 2020 14:45:40 +0000 From: Christoph Hellwig To: "David S. Miller" , Jakub Kicinski , Alexey Kuznetsov , Hideaki YOSHIFUJI Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org (open list) Subject: [PATCH 1/4] ipv6: lift copy_from_user out of ipv6_route_ioctl Date: Thu, 14 May 2020 16:45:32 +0200 Message-Id: <20200514144535.3000410-2-hch@lst.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200514144535.3000410-1-hch@lst.de> References: <20200514144535.3000410-1-hch@lst.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Prepare for better compat ioctl handling by moving the user copy out of ipv6_route_ioctl. Signed-off-by: Christoph Hellwig --- include/net/ip6_route.h | 3 ++- net/ipv6/af_inet6.c | 16 +++++++++------ net/ipv6/route.c | 44 +++++++++++++++-------------------------- 3 files changed, 28 insertions(+), 35 deletions(-) diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h index e525f003e6197..2a5277758379e 100644 --- a/include/net/ip6_route.h +++ b/include/net/ip6_route.h @@ -118,7 +118,8 @@ void ip6_route_init_special_entries(void); int ip6_route_init(void); void ip6_route_cleanup(void); -int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg); +int ipv6_route_ioctl(struct net *net, unsigned int cmd, + struct in6_rtmsg *rtmsg); int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags, struct netlink_ext_ack *extack); diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c index 345baa0a754f4..066a85531edcd 100644 --- a/net/ipv6/af_inet6.c +++ b/net/ipv6/af_inet6.c @@ -542,19 +542,23 @@ int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) { struct sock *sk = sock->sk; struct net *net = sock_net(sk); + void __user *argp = (void __user *)arg; switch (cmd) { case SIOCADDRT: - case SIOCDELRT: - - return ipv6_route_ioctl(net, cmd, (void __user *)arg); + case SIOCDELRT: { + struct in6_rtmsg rtmsg; + if (copy_from_user(&rtmsg, argp, sizeof(rtmsg))) + return -EFAULT; + return ipv6_route_ioctl(net, cmd, &rtmsg); + } case SIOCSIFADDR: - return addrconf_add_ifaddr(net, (void __user *) arg); + return addrconf_add_ifaddr(net, argp); case SIOCDIFADDR: - return addrconf_del_ifaddr(net, (void __user *) arg); + return addrconf_del_ifaddr(net, argp); case SIOCSIFDSTADDR: - return addrconf_set_dstaddr(net, (void __user *) arg); + return addrconf_set_dstaddr(net, argp); default: if (!sk->sk_prot->ioctl) return -ENOIOCTLCMD; diff --git a/net/ipv6/route.c b/net/ipv6/route.c index 4292653af533b..d4c344e6d1ac6 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -4334,41 +4334,29 @@ static void rtmsg_to_fib6_config(struct net *net, }; } -int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) +int ipv6_route_ioctl(struct net *net, unsigned int cmd, struct in6_rtmsg *rtmsg) { struct fib6_config cfg; - struct in6_rtmsg rtmsg; int err; - switch (cmd) { - case SIOCADDRT: /* Add a route */ - case SIOCDELRT: /* Delete a route */ - if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) - return -EPERM; - err = copy_from_user(&rtmsg, arg, - sizeof(struct in6_rtmsg)); - if (err) - return -EFAULT; + if (cmd != SIOCADDRT && cmd != SIOCDELRT) + return -EINVAL; + if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) + return -EPERM; - rtmsg_to_fib6_config(net, &rtmsg, &cfg); + rtmsg_to_fib6_config(net, rtmsg, &cfg); - rtnl_lock(); - switch (cmd) { - case SIOCADDRT: - err = ip6_route_add(&cfg, GFP_KERNEL, NULL); - break; - case SIOCDELRT: - err = ip6_route_del(&cfg, NULL); - break; - default: - err = -EINVAL; - } - rtnl_unlock(); - - return err; + rtnl_lock(); + switch (cmd) { + case SIOCADDRT: + err = ip6_route_add(&cfg, GFP_KERNEL, NULL); + break; + case SIOCDELRT: + err = ip6_route_del(&cfg, NULL); + break; } - - return -EINVAL; + rtnl_unlock(); + return err; } /* -- 2.26.2