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 4DA731B179; Fri, 12 Oct 2018 10:43:56 +0200 (CEST) Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 32FE43001910; Fri, 12 Oct 2018 08:43:55 +0000 (UTC) Received: from [10.36.112.48] (ovpn-112-48.ams2.redhat.com [10.36.112.48]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 74013601B0; Fri, 12 Oct 2018 08:43:48 +0000 (UTC) To: Ilya Maximets , dev@dpdk.org, tiwei.bie@intel.com, zhihong.wang@intel.com, jfreimann@redhat.com, nicknickolaev@gmail.com, bruce.richardson@intel.com, alejandro.lucero@netronome.com, dgilbert@redhat.com Cc: stable@dpdk.org References: <20181011092432.22275-1-maxime.coquelin@redhat.com> <20181011092432.22275-8-maxime.coquelin@redhat.com> <20181011155709eucas1p20da3d82e3f74a0f8b8bd06eae4baa0c5~cmQddRjzg2527125271eucas1p2_@eucas1p2.samsung.com> From: Maxime Coquelin Message-ID: <377e0ee1-562d-e5cb-e411-e041f8c60ba5@redhat.com> Date: Fri, 12 Oct 2018 10:43:45 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20181011155709eucas1p20da3d82e3f74a0f8b8bd06eae4baa0c5~cmQddRjzg2527125271eucas1p2_@eucas1p2.samsung.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.47]); Fri, 12 Oct 2018 08:43:55 +0000 (UTC) Subject: Re: [dpdk-dev] [PATCH v6 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: Fri, 12 Oct 2018 08:43:56 -0000 On 10/11/2018 05:59 PM, Ilya Maximets wrote: > On 11.10.2018 12:24, Maxime Coquelin wrote: >> As soon as some ancillary data (fds) are received, it is copied >> without checking its length. >> >> This patch 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..3b0287a26 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) { > > Hmm. I just noticed that 'msg_controllen' is set to receive > not more than max_fds descriptors. So, this case should not > be possible. We will receive MSG_CTRUNC and return before > the loop. Maybe it is better to remove check for MSG_CTRUN. IIUC, if MSG_CTRUNC happens, we may have to close anyway the ones received. Do you agree? >> + 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 >>