From patchwork Thu Apr 12 15:12:29 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tiwei Bie X-Patchwork-Id: 897714 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=2001:4830:134:3::11; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=intel.com Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 40MPkg0RMJz9s27 for ; Fri, 13 Apr 2018 01:21:13 +1000 (AEST) Received: from localhost ([::1]:47091 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1f6e2A-0001xM-OI for incoming@patchwork.ozlabs.org; Thu, 12 Apr 2018 11:21:10 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:39139) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1f6dwA-0005n2-MJ for qemu-devel@nongnu.org; Thu, 12 Apr 2018 11:15:00 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1f6dw6-0007TM-Q9 for qemu-devel@nongnu.org; Thu, 12 Apr 2018 11:14:58 -0400 Received: from mga09.intel.com ([134.134.136.24]:48812) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1f6dw6-0007PY-Gb for qemu-devel@nongnu.org; Thu, 12 Apr 2018 11:14:54 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 12 Apr 2018 08:14:54 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.48,442,1517904000"; d="scan'208";a="32878597" Received: from debian.sh.intel.com ([10.67.104.164]) by orsmga007.jf.intel.com with ESMTP; 12 Apr 2018 08:14:52 -0700 From: Tiwei Bie To: mst@redhat.com, jasowang@redhat.com, alex.williamson@redhat.com, pbonzini@redhat.com, stefanha@redhat.com, qemu-devel@nongnu.org, virtio-dev@lists.oasis-open.org Date: Thu, 12 Apr 2018 23:12:29 +0800 Message-Id: <20180412151232.17506-4-tiwei.bie@intel.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20180412151232.17506-1-tiwei.bie@intel.com> References: <20180412151232.17506-1-tiwei.bie@intel.com> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 134.134.136.24 Subject: [Qemu-devel] [PATCH v3 3/6] vhost-user: support receiving file descriptors in slave_read X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: jianfeng.tan@intel.com, tiwei.bie@intel.com, cunming.liang@intel.com, xiao.w.wang@intel.com, zhihong.wang@intel.com, dan.daly@intel.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: Tiwei Bie --- hw/virtio/vhost-user.c | 41 ++++++++++++++++++++++++++++++++++++++++- 1 file changed, 40 insertions(+), 1 deletion(-) diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index 91edd95453..9cea2c8c51 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -854,14 +854,44 @@ static void slave_read(void *opaque) VhostUserHeader hdr = { 0, }; VhostUserPayload payload = { 0, }; int size, ret = 0; + struct iovec iov; + struct msghdr msgh; + int fd = -1; + char control[CMSG_SPACE(sizeof(fd))]; + struct cmsghdr *cmsg; + size_t fdsize; + + memset(&msgh, 0, sizeof(msgh)); + msgh.msg_iov = &iov; + msgh.msg_iovlen = 1; + msgh.msg_control = control; + msgh.msg_controllen = sizeof(control); /* Read header */ - size = read(u->slave_fd, &hdr, VHOST_USER_HDR_SIZE); + iov.iov_base = &hdr; + iov.iov_len = VHOST_USER_HDR_SIZE; + + size = recvmsg(u->slave_fd, &msgh, 0); if (size != VHOST_USER_HDR_SIZE) { error_report("Failed to read from slave."); goto err; } + if (msgh.msg_flags & MSG_CTRUNC) { + error_report("Truncated message."); + goto err; + } + + for (cmsg = CMSG_FIRSTHDR(&msgh); cmsg != NULL; + cmsg = CMSG_NXTHDR(&msgh, cmsg)) { + if (cmsg->cmsg_level == SOL_SOCKET && + cmsg->cmsg_type == SCM_RIGHTS) { + fdsize = cmsg->cmsg_len - CMSG_LEN(0); + memcpy(&fd, CMSG_DATA(cmsg), fdsize); + break; + } + } + if (hdr.size > VHOST_USER_PAYLOAD_SIZE) { error_report("Failed to read msg header." " Size %d exceeds the maximum %zu.", hdr.size, @@ -885,9 +915,15 @@ static void slave_read(void *opaque) break; default: error_report("Received unexpected msg type."); + if (fd != -1) { + close(fd); + } ret = -EINVAL; } + /* Message handlers need to make sure that fd will be consumed. */ + fd = -1; + /* * REPLY_ACK feature handling. Other reply types has to be managed * directly in their request handlers. @@ -920,6 +956,9 @@ err: qemu_set_fd_handler(u->slave_fd, NULL, NULL, NULL); close(u->slave_fd); u->slave_fd = -1; + if (fd != -1) { + close(fd); + } return; }