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Subject: Re: [PATCH v3 3/6] vhost-user: support receiving file descriptors in slave_read
On Thu, Apr 12, 2018 at 11:12:29PM +0800, Tiwei Bie wrote: > Signed-off-by: Tiwei Bie <tiwei.bie@intel.com> Thinking about it, I think we should add a protocol feature for this. This way remote can find out whether it's safe to send this data to us. > --- > 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; > } > > -- > 2.11.0
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