From patchwork Thu Jul 23 06:08:55 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11680025 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id CC2AF13A4 for ; Thu, 23 Jul 2020 06:11:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AF48420825 for ; Thu, 23 Jul 2020 06:11:56 +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="sGtRnqYd" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728183AbgGWGLz (ORCPT ); Thu, 23 Jul 2020 02:11:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56480 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725858AbgGWGJk (ORCPT ); Thu, 23 Jul 2020 02:09:40 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EED8CC0619E3; Wed, 22 Jul 2020 23:09:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.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=FYcs44yoYK35f4AWKo/oBKg4WT6Lxy2mEQ4X9UWOEVM=; b=sGtRnqYdkZcPfYZRzM5+T6BC7g mhzEiZfizA260w/TsQecExreOl8sSzsN1E3mIXeoxHZU36ivBxA2nf5wopiR6Xmx/cQvYW2P/ynSC Xe1nrgJEf8JieAdBjc+O1SmiuDErWv514IwyHESk6utAUAijDnTteN+yeaXikk8ne4xYjJ8zHfG6u opDvToneN0P5tYC+PE7YvJfTgEyM3HlKL9UuVCORhwsrhnbMPetCBFN6bdXX0rq5XUUW7YFejw1P+ xHdieh/2tilcdHvGOXeaSMCYhuDDkM89QNbs529lpilLHSQLeMBqu6mV+cHiTQTFRT5zNKUXz2iEt SkT72xJg==; Received: from [2001:4bb8:18c:2acc:91df:aae8:fa3b:de9c] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jyUQ3-0003ll-36; Thu, 23 Jul 2020 06:09:27 +0000 From: Christoph Hellwig To: "David S. Miller" , Jakub Kicinski , Alexei Starovoitov , Daniel Borkmann , Alexey Kuznetsov , Hideaki YOSHIFUJI , Eric Dumazet Cc: linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org, netfilter-devel@vger.kernel.org, coreteam@netfilter.org, linux-sctp@vger.kernel.org, linux-hams@vger.kernel.org, linux-bluetooth@vger.kernel.org, bridge@lists.linux-foundation.org, linux-can@vger.kernel.org, dccp@vger.kernel.org, linux-decnet-user@lists.sourceforge.net, linux-wpan@vger.kernel.org, linux-s390@vger.kernel.org, mptcp@lists.01.org, lvs-devel@vger.kernel.org, rds-devel@oss.oracle.com, linux-afs@lists.infradead.org, tipc-discussion@lists.sourceforge.net, linux-x25@vger.kernel.org Subject: [PATCH 13/26] bpfilter: switch bpfilter_ip_set_sockopt to sockptr_t Date: Thu, 23 Jul 2020 08:08:55 +0200 Message-Id: <20200723060908.50081-14-hch@lst.de> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200723060908.50081-1-hch@lst.de> References: <20200723060908.50081-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-wpan-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wpan@vger.kernel.org This is mostly to prepare for cleaning up the callers, as bpfilter by design can't handle kernel pointers. Signed-off-by: Christoph Hellwig --- include/linux/bpfilter.h | 6 +++--- net/bpfilter/bpfilter_kern.c | 6 +++--- net/ipv4/bpfilter/sockopt.c | 8 ++++---- net/ipv4/ip_sockglue.c | 3 ++- 4 files changed, 12 insertions(+), 11 deletions(-) diff --git a/include/linux/bpfilter.h b/include/linux/bpfilter.h index 9b114c718a7617..2ae3c8e1d83c43 100644 --- a/include/linux/bpfilter.h +++ b/include/linux/bpfilter.h @@ -4,9 +4,10 @@ #include #include +#include struct sock; -int bpfilter_ip_set_sockopt(struct sock *sk, int optname, char __user *optval, +int bpfilter_ip_set_sockopt(struct sock *sk, int optname, sockptr_t optval, unsigned int optlen); int bpfilter_ip_get_sockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen); @@ -16,8 +17,7 @@ struct bpfilter_umh_ops { struct umd_info info; /* since ip_getsockopt() can run in parallel, serialize access to umh */ struct mutex lock; - int (*sockopt)(struct sock *sk, int optname, - char __user *optval, + int (*sockopt)(struct sock *sk, int optname, sockptr_t optval, unsigned int optlen, bool is_set); int (*start)(void); }; diff --git a/net/bpfilter/bpfilter_kern.c b/net/bpfilter/bpfilter_kern.c index 00540457e5f4d3..f580c3344cb3ac 100644 --- a/net/bpfilter/bpfilter_kern.c +++ b/net/bpfilter/bpfilter_kern.c @@ -60,17 +60,17 @@ static int bpfilter_send_req(struct mbox_request *req) } static int bpfilter_process_sockopt(struct sock *sk, int optname, - char __user *optval, unsigned int optlen, + sockptr_t optval, unsigned int optlen, bool is_set) { struct mbox_request req = { .is_set = is_set, .pid = current->pid, .cmd = optname, - .addr = (uintptr_t)optval, + .addr = (uintptr_t)optval.user, .len = optlen, }; - if (uaccess_kernel()) { + if (uaccess_kernel() || sockptr_is_kernel(optval)) { pr_err("kernel access not supported\n"); return -EFAULT; } diff --git a/net/ipv4/bpfilter/sockopt.c b/net/ipv4/bpfilter/sockopt.c index 9063c6767d3410..1b34cb9a7708ec 100644 --- a/net/ipv4/bpfilter/sockopt.c +++ b/net/ipv4/bpfilter/sockopt.c @@ -21,8 +21,7 @@ void bpfilter_umh_cleanup(struct umd_info *info) } EXPORT_SYMBOL_GPL(bpfilter_umh_cleanup); -static int bpfilter_mbox_request(struct sock *sk, int optname, - char __user *optval, +static int bpfilter_mbox_request(struct sock *sk, int optname, sockptr_t optval, unsigned int optlen, bool is_set) { int err; @@ -52,7 +51,7 @@ static int bpfilter_mbox_request(struct sock *sk, int optname, return err; } -int bpfilter_ip_set_sockopt(struct sock *sk, int optname, char __user *optval, +int bpfilter_ip_set_sockopt(struct sock *sk, int optname, sockptr_t optval, unsigned int optlen) { return bpfilter_mbox_request(sk, optname, optval, optlen, true); @@ -66,7 +65,8 @@ int bpfilter_ip_get_sockopt(struct sock *sk, int optname, char __user *optval, if (get_user(len, optlen)) return -EFAULT; - return bpfilter_mbox_request(sk, optname, optval, len, false); + return bpfilter_mbox_request(sk, optname, USER_SOCKPTR(optval), len, + false); } static int __init bpfilter_sockopt_init(void) diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c index 42befbf12846c0..36f746e01741f6 100644 --- a/net/ipv4/ip_sockglue.c +++ b/net/ipv4/ip_sockglue.c @@ -1414,7 +1414,8 @@ int ip_setsockopt(struct sock *sk, int level, #if IS_ENABLED(CONFIG_BPFILTER_UMH) if (optname >= BPFILTER_IPT_SO_SET_REPLACE && optname < BPFILTER_IPT_SET_MAX) - err = bpfilter_ip_set_sockopt(sk, optname, optval, optlen); + err = bpfilter_ip_set_sockopt(sk, optname, USER_SOCKPTR(optval), + optlen); #endif #ifdef CONFIG_NETFILTER /* we need to exclude all possible ENOPROTOOPTs except default case */