From patchwork Fri Jul 8 18:43:55 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dylan Yudaken X-Patchwork-Id: 12911752 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 284BBC43334 for ; Fri, 8 Jul 2022 18:44:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239623AbiGHSoR (ORCPT ); Fri, 8 Jul 2022 14:44:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36520 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239155AbiGHSoQ (ORCPT ); Fri, 8 Jul 2022 14:44:16 -0400 Received: from mx0a-00082601.pphosted.com (mx0a-00082601.pphosted.com [67.231.145.42]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 10B4E2CC9C for ; Fri, 8 Jul 2022 11:44:16 -0700 (PDT) Received: from pps.filterd (m0109333.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 268HAUTK001956 for ; Fri, 8 Jul 2022 11:44:15 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=facebook; bh=OVqb/DUrJRjZeyXe67Cr5HfdeNDtk/VXo8AAeukVNwk=; b=KSWZw9pYuzs2pds3m2OHCJTL6FdnfOqj2+Uq4cAw+Jm7tASHAdtiFQY5J8FokgBwXnCe FB9O6YCQM/2R8nV7cvOdWAQu8PEpbyl8Mn+lAcgwqEo2ibwcK6dYvGDEOgPi1LHmiTyM qrR4VcBjJ7EbSuWp8vJFODGyrJJmCGDoGX4= Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 3h67d26cvg-2 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Fri, 08 Jul 2022 11:44:15 -0700 Received: from twshared25107.07.ash9.facebook.com (2620:10d:c085:208::f) by mail.thefacebook.com (2620:10d:c085:11d::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.28; Fri, 8 Jul 2022 11:44:14 -0700 Received: by devbig038.lla2.facebook.com (Postfix, from userid 572232) id 1A1042BA1E88; Fri, 8 Jul 2022 11:44:11 -0700 (PDT) From: Dylan Yudaken To: Jens Axboe , Pavel Begunkov , , , , , CC: , , Dylan Yudaken Subject: [PATCH for-next 1/3] net: copy from user before calling __copy_msghdr Date: Fri, 8 Jul 2022 11:43:55 -0700 Message-ID: <20220708184358.1624275-2-dylany@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220708184358.1624275-1-dylany@fb.com> References: <20220708184358.1624275-1-dylany@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-GUID: 4KyNML3q4b1VTZ8e_fBmkr2qcLB_vmM0 X-Proofpoint-ORIG-GUID: 4KyNML3q4b1VTZ8e_fBmkr2qcLB_vmM0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.883,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-07-08_15,2022-07-08_01,2022-06-22_01 Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org this is in preparation for multishot receive from io_uring, where it needs to have access to the original struct user_msghdr. functionally this should be a no-op. Signed-off-by: Dylan Yudaken --- include/linux/socket.h | 7 +++---- io_uring/net.c | 17 +++++++++-------- net/socket.c | 37 ++++++++++++++++--------------------- 3 files changed, 28 insertions(+), 33 deletions(-) diff --git a/include/linux/socket.h b/include/linux/socket.h index 17311ad9f9af..be24f1c8568a 100644 --- a/include/linux/socket.h +++ b/include/linux/socket.h @@ -416,10 +416,9 @@ extern int recvmsg_copy_msghdr(struct msghdr *msg, struct user_msghdr __user *umsg, unsigned flags, struct sockaddr __user **uaddr, struct iovec **iov); -extern int __copy_msghdr_from_user(struct msghdr *kmsg, - struct user_msghdr __user *umsg, - struct sockaddr __user **save_addr, - struct iovec __user **uiov, size_t *nsegs); +extern int __copy_msghdr(struct msghdr *kmsg, + struct user_msghdr *umsg, + struct sockaddr __user **save_addr); /* helpers which do the actual work for syscalls */ extern int __sys_recvfrom(int fd, void __user *ubuf, size_t size, diff --git a/io_uring/net.c b/io_uring/net.c index c1cbafe96c63..99fb878afd65 100644 --- a/io_uring/net.c +++ b/io_uring/net.c @@ -330,31 +330,32 @@ static int __io_recvmsg_copy_hdr(struct io_kiocb *req, struct io_async_msghdr *iomsg) { struct io_sr_msg *sr = io_kiocb_to_cmd(req); - struct iovec __user *uiov; - size_t iov_len; + struct user_msghdr msg; int ret; - ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, - &iomsg->uaddr, &uiov, &iov_len); + if (copy_from_user(&msg, sr->umsg, sizeof(*sr->umsg))) + return -EFAULT; + + ret = __copy_msghdr(&iomsg->msg, &msg, &iomsg->uaddr); if (ret) return ret; if (req->flags & REQ_F_BUFFER_SELECT) { - if (iov_len == 0) { + if (msg.msg_iovlen == 0) { sr->len = iomsg->fast_iov[0].iov_len = 0; iomsg->fast_iov[0].iov_base = NULL; iomsg->free_iov = NULL; - } else if (iov_len > 1) { + } else if (msg.msg_iovlen > 1) { return -EINVAL; } else { - if (copy_from_user(iomsg->fast_iov, uiov, sizeof(*uiov))) + if (copy_from_user(iomsg->fast_iov, msg.msg_iov, sizeof(*msg.msg_iov))) return -EFAULT; sr->len = iomsg->fast_iov[0].iov_len; iomsg->free_iov = NULL; } } else { iomsg->free_iov = iomsg->fast_iov; - ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV, + ret = __import_iovec(READ, msg.msg_iov, msg.msg_iovlen, UIO_FASTIOV, &iomsg->free_iov, &iomsg->msg.msg_iter, false); if (ret > 0) diff --git a/net/socket.c b/net/socket.c index 96300cdc0625..843545c21ec2 100644 --- a/net/socket.c +++ b/net/socket.c @@ -2358,25 +2358,20 @@ struct used_address { unsigned int name_len; }; -int __copy_msghdr_from_user(struct msghdr *kmsg, - struct user_msghdr __user *umsg, - struct sockaddr __user **save_addr, - struct iovec __user **uiov, size_t *nsegs) +int __copy_msghdr(struct msghdr *kmsg, + struct user_msghdr *msg, + struct sockaddr __user **save_addr) { - struct user_msghdr msg; ssize_t err; - if (copy_from_user(&msg, umsg, sizeof(*umsg))) - return -EFAULT; - kmsg->msg_control_is_user = true; kmsg->msg_get_inq = 0; - kmsg->msg_control_user = msg.msg_control; - kmsg->msg_controllen = msg.msg_controllen; - kmsg->msg_flags = msg.msg_flags; + kmsg->msg_control_user = msg->msg_control; + kmsg->msg_controllen = msg->msg_controllen; + kmsg->msg_flags = msg->msg_flags; - kmsg->msg_namelen = msg.msg_namelen; - if (!msg.msg_name) + kmsg->msg_namelen = msg->msg_namelen; + if (!msg->msg_name) kmsg->msg_namelen = 0; if (kmsg->msg_namelen < 0) @@ -2386,11 +2381,11 @@ int __copy_msghdr_from_user(struct msghdr *kmsg, kmsg->msg_namelen = sizeof(struct sockaddr_storage); if (save_addr) - *save_addr = msg.msg_name; + *save_addr = msg->msg_name; - if (msg.msg_name && kmsg->msg_namelen) { + if (msg->msg_name && kmsg->msg_namelen) { if (!save_addr) { - err = move_addr_to_kernel(msg.msg_name, + err = move_addr_to_kernel(msg->msg_name, kmsg->msg_namelen, kmsg->msg_name); if (err < 0) @@ -2401,12 +2396,10 @@ int __copy_msghdr_from_user(struct msghdr *kmsg, kmsg->msg_namelen = 0; } - if (msg.msg_iovlen > UIO_MAXIOV) + if (msg->msg_iovlen > UIO_MAXIOV) return -EMSGSIZE; kmsg->msg_iocb = NULL; - *uiov = msg.msg_iov; - *nsegs = msg.msg_iovlen; return 0; } @@ -2418,8 +2411,10 @@ static int copy_msghdr_from_user(struct msghdr *kmsg, struct user_msghdr msg; ssize_t err; - err = __copy_msghdr_from_user(kmsg, umsg, save_addr, &msg.msg_iov, - &msg.msg_iovlen); + if (copy_from_user(&msg, umsg, sizeof(*umsg))) + return -EFAULT; + + err = __copy_msghdr(kmsg, &msg, save_addr); if (err) return err;