Revert "tree-wide: Always use recvmsg with MSG_CMSG_CLOEXEC"

This reverts commit d6d810fbf8.

It's apparently not OK to pass MSG_CMSG_CLOEXEC to recvmsg() of raw
sockets.

src/libsystemd-network/sd-dhcp-client.c

@@ -1582,7 +1582,7 @@ static int client_receive_message_raw(sd_event_source *s, int fd,
         iov.iov_base = packet;
         iov.iov_len = buflen;
 
-        len = recvmsg(fd, &msg, MSG_CMSG_CLOEXEC);
+        len = recvmsg(fd, &msg, 0);
         if (len < 0) {
                 log_dhcp_client(client, "could not receive message from raw "
                                 "socket: %m");

src/libsystemd-network/sd-dhcp-server.c

@@ -897,7 +897,7 @@ static int server_receive_message(sd_event_source *s, int fd,
         iov.iov_base = message;
         iov.iov_len = buflen;
 
-        len = recvmsg(fd, &msg, MSG_CMSG_CLOEXEC);
+        len = recvmsg(fd, &msg, 0);
         if (len < buflen)
                 return 0;
         else if ((size_t)len < sizeof(DHCPMessage))

src/libsystemd/sd-rtnl/rtnl-message.c

@@ -1431,7 +1431,7 @@ static int socket_recv_message(int fd, struct iovec *iov, uint32_t *_group, bool
         assert(fd >= 0);
         assert(iov);
 
-        r = recvmsg(fd, &msg, MSG_TRUNC | MSG_CMSG_CLOEXEC | (peek ? MSG_PEEK : 0));
+        r = recvmsg(fd, &msg, MSG_TRUNC | (peek ? MSG_PEEK : 0));
         if (r < 0) {
                 /* no data */
                 if (errno == ENOBUFS)
@@ -1467,7 +1467,7 @@ static int socket_recv_message(int fd, struct iovec *iov, uint32_t *_group, bool
                 /* not from the kernel, ignore */
                 if (peek) {
                         /* drop the message */
-                        r = recvmsg(fd, &msg, MSG_CMSG_CLOEXEC);
+                        r = recvmsg(fd, &msg, 0);
                         if (r < 0)
                                 return (errno == EAGAIN || errno == EINTR) ? 0 : -errno;
                 }

src/libudev/libudev-monitor.c

@@ -600,7 +600,7 @@ retry:
         smsg.msg_name = &snl;
         smsg.msg_namelen = sizeof(snl);
 
-        buflen = recvmsg(udev_monitor->sock, &smsg, MSG_CMSG_CLOEXEC);
+        buflen = recvmsg(udev_monitor->sock, &smsg, 0);
         if (buflen < 0) {
                 if (errno != EINTR)
                         log_debug("unable to receive message");

src/machine/machine-dbus.c

@@ -255,7 +255,7 @@ int bus_machine_method_get_addresses(sd_bus *bus, sd_bus_message *message, void
                 iov[0] = (struct iovec) { .iov_base = &family, .iov_len = sizeof(family) };
                 iov[1] = (struct iovec) { .iov_base = &in_addr, .iov_len = sizeof(in_addr) };
 
-                n = recvmsg(pair[0], &mh, MSG_CMSG_CLOEXEC);
+                n = recvmsg(pair[0], &mh, 0);
                 if (n < 0)
                         return sd_bus_error_set_errno(error, -errno);
                 if ((size_t) n < sizeof(family))

src/resolve/resolved-manager.c

@@ -892,7 +892,7 @@ int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) {
         mh.msg_control = &control;
         mh.msg_controllen = sizeof(control);
 
-        l = recvmsg(fd, &mh, MSG_CMSG_CLOEXEC);
+        l = recvmsg(fd, &mh, 0);
         if (l < 0) {
                 if (errno == EAGAIN || errno == EINTR)
                         return 0;

src/shutdownd/shutdownd.c

@@ -69,7 +69,7 @@ static int read_packet(int fd, union shutdown_buffer *_b) {
         assert(fd >= 0);
         assert(_b);
 
-        n = recvmsg(fd, &msghdr, MSG_DONTWAIT|MSG_CMSG_CLOEXEC);
+        n = recvmsg(fd, &msghdr, MSG_DONTWAIT);
         if (n <= 0) {
                 if (n == 0) {
                         log_error("Short read");

src/timesync/timesyncd-manager.c

@@ -516,7 +516,7 @@ static int manager_receive_response(sd_event_source *source, int fd, uint32_t re
                 return manager_connect(m);
         }
 
-        len = recvmsg(fd, &msghdr, MSG_DONTWAIT|MSG_CMSG_CLOEXEC);
+        len = recvmsg(fd, &msghdr, MSG_DONTWAIT);
         if (len < 0) {
                 if (errno == EAGAIN)
                         return 0;

src/udev/udev-ctrl.c

@@ -372,7 +372,7 @@ struct udev_ctrl_msg *udev_ctrl_receive_msg(struct udev_ctrl_connection *conn) {
         iov.iov_base = &uctrl_msg->ctrl_msg_wire;
         iov.iov_len = sizeof(struct udev_ctrl_msg_wire);
 
-        size = recvmsg(conn->sock, &smsg, MSG_CMSG_CLOEXEC);
+        size = recvmsg(conn->sock, &smsg, 0);
         if (size <  0) {
                 log_error_errno(errno, "unable to receive ctrl message: %m");
                 goto err;