From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by dpdk.org (Postfix) with ESMTP id 6BA011B597; Tue, 9 Oct 2018 22:55:31 +0200 (CEST) Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id C318E3082E4E; Tue, 9 Oct 2018 20:55:30 +0000 (UTC) Received: from localhost.localdomain (unknown [10.36.112.13]) by smtp.corp.redhat.com (Postfix) with ESMTP id C48B87E39D; Tue, 9 Oct 2018 20:55:12 +0000 (UTC) From: Maxime Coquelin To: dev@dpdk.org, tiwei.bie@intel.com, zhihong.wang@intel.com, jfreimann@redhat.com, nicknickolaev@gmail.com, i.maximets@samsung.com, bruce.richardson@intel.com, alejandro.lucero@netronome.com Cc: dgilbert@redhat.com, stable@dpdk.org, Maxime Coquelin Date: Tue, 9 Oct 2018 22:54:14 +0200 Message-Id: <20181009205426.21219-8-maxime.coquelin@redhat.com> In-Reply-To: <20181009205426.21219-1-maxime.coquelin@redhat.com> References: <20181009205426.21219-1-maxime.coquelin@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.46]); Tue, 09 Oct 2018 20:55:30 +0000 (UTC) Subject: [dpdk-dev] [PATCH v5 07/19] vhost: add number of fds to vhost-user messages and use it X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 09 Oct 2018 20:55:31 -0000 As soons as some anciliarry datai (fds) are received, it is copied without checking its length. This patch adds adds the number of fds received to the message, which is set in read_vhost_message(). This is preliminary work to support sending fds to Qemu. Signed-off-by: Dr. David Alan Gilbert Signed-off-by: Maxime Coquelin --- lib/librte_vhost/socket.c | 25 ++++++++++++++++++++----- lib/librte_vhost/vhost_user.c | 2 +- lib/librte_vhost/vhost_user.h | 4 +++- 3 files changed, 24 insertions(+), 7 deletions(-) diff --git a/lib/librte_vhost/socket.c b/lib/librte_vhost/socket.c index d63031747..7cad5593e 100644 --- a/lib/librte_vhost/socket.c +++ b/lib/librte_vhost/socket.c @@ -94,18 +94,24 @@ static struct vhost_user vhost_user = { .mutex = PTHREAD_MUTEX_INITIALIZER, }; -/* return bytes# of read on success or negative val on failure. */ +/* + * return bytes# of read on success or negative val on failure. Update fdnum + * with number of fds read. + */ int -read_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num) +read_fd_message(int sockfd, char *buf, int buflen, int *fds, int max_fds, + int *fd_num) { struct iovec iov; struct msghdr msgh; - size_t fdsize = fd_num * sizeof(int); - char control[CMSG_SPACE(fdsize)]; + char control[CMSG_SPACE(max_fds * sizeof(int))]; struct cmsghdr *cmsg; int got_fds = 0; + int *tmp_fds; int ret; + *fd_num = 0; + memset(&msgh, 0, sizeof(msgh)); iov.iov_base = buf; iov.iov_len = buflen; @@ -131,13 +137,22 @@ read_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num) if ((cmsg->cmsg_level == SOL_SOCKET) && (cmsg->cmsg_type == SCM_RIGHTS)) { got_fds = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int); + if (got_fds > max_fds) { + RTE_LOG(ERR, VHOST_CONFIG, + "Received msg contains more fds than supported\n"); + tmp_fds = (int *)CMSG_DATA(cmsg); + while (got_fds--) + close(tmp_fds[got_fds]); + return -1; + } + *fd_num = got_fds; memcpy(fds, CMSG_DATA(cmsg), got_fds * sizeof(int)); break; } } /* Clear out unused file descriptors */ - while (got_fds < fd_num) + while (got_fds < max_fds) fds[got_fds++] = -1; return ret; diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c index 83d3e6321..c1c5f35ff 100644 --- a/lib/librte_vhost/vhost_user.c +++ b/lib/librte_vhost/vhost_user.c @@ -1509,7 +1509,7 @@ read_vhost_message(int sockfd, struct VhostUserMsg *msg) int ret; ret = read_fd_message(sockfd, (char *)msg, VHOST_USER_HDR_SIZE, - msg->fds, VHOST_MEMORY_MAX_NREGIONS); + msg->fds, VHOST_MEMORY_MAX_NREGIONS, &msg->fd_num); if (ret <= 0) return ret; diff --git a/lib/librte_vhost/vhost_user.h b/lib/librte_vhost/vhost_user.h index 62654f736..9a91d496b 100644 --- a/lib/librte_vhost/vhost_user.h +++ b/lib/librte_vhost/vhost_user.h @@ -132,6 +132,7 @@ typedef struct VhostUserMsg { VhostUserVringArea area; } payload; int fds[VHOST_MEMORY_MAX_NREGIONS]; + int fd_num; } __attribute((packed)) VhostUserMsg; #define VHOST_USER_HDR_SIZE offsetof(VhostUserMsg, payload.u64) @@ -155,7 +156,8 @@ int vhost_user_iotlb_miss(struct virtio_net *dev, uint64_t iova, uint8_t perm); int vhost_user_host_notifier_ctrl(int vid, bool enable); /* socket.c */ -int read_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num); +int read_fd_message(int sockfd, char *buf, int buflen, int *fds, int max_fds, + int *fd_num); int send_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num); #endif -- 2.17.1