+static int mount_dev(BindMount *m) {
+ static const char devnodes[] =
+ "/dev/null\0"
+ "/dev/zero\0"
+ "/dev/full\0"
+ "/dev/random\0"
+ "/dev/urandom\0"
+ "/dev/tty\0";
+
+ char temporary_mount[] = "/tmp/namespace-dev-XXXXXX";
+ const char *d, *dev = NULL, *devpts = NULL, *devshm = NULL, *devhugepages = NULL, *devmqueue = NULL, *devlog = NULL, *devptmx = NULL;
+ _cleanup_umask_ mode_t u;
+ int r;
+
+ assert(m);
+
+ u = umask(0000);
+
+ if (!mkdtemp(temporary_mount))
+ return -errno;
+
+ dev = strappenda(temporary_mount, "/dev");
+ (void)mkdir(dev, 0755);
+ if (mount("tmpfs", dev, "tmpfs", MS_NOSUID|MS_STRICTATIME, "mode=755") < 0) {
+ r = -errno;
+ goto fail;
+ }
+
+ devpts = strappenda(temporary_mount, "/dev/pts");
+ (void)mkdir(devpts, 0755);
+ if (mount("/dev/pts", devpts, NULL, MS_BIND, NULL) < 0) {
+ r = -errno;
+ goto fail;
+ }
+
+ devptmx = strappenda(temporary_mount, "/dev/ptmx");
+ symlink("pts/ptmx", devptmx);
+
+ devshm = strappenda(temporary_mount, "/dev/shm");
+ (void)mkdir(devshm, 01777);
+ r = mount("/dev/shm", devshm, NULL, MS_BIND, NULL);
+ if (r < 0) {
+ r = -errno;
+ goto fail;
+ }
+
+ devmqueue = strappenda(temporary_mount, "/dev/mqueue");
+ (void)mkdir(devmqueue, 0755);
+ mount("/dev/mqueue", devmqueue, NULL, MS_BIND, NULL);
+
+ devhugepages = strappenda(temporary_mount, "/dev/hugepages");
+ (void)mkdir(devhugepages, 0755);
+ mount("/dev/hugepages", devhugepages, NULL, MS_BIND, NULL);
+
+ devlog = strappenda(temporary_mount, "/dev/log");
+ symlink("/run/systemd/journal/dev-log", devlog);
+
+ NULSTR_FOREACH(d, devnodes) {
+ _cleanup_free_ char *dn = NULL;
+ struct stat st;
+
+ r = stat(d, &st);
+ if (r < 0) {
+
+ if (errno == ENOENT)
+ continue;
+
+ r = -errno;
+ goto fail;
+ }
+
+ if (!S_ISBLK(st.st_mode) &&
+ !S_ISCHR(st.st_mode)) {
+ r = -EINVAL;
+ goto fail;
+ }
+
+ if (st.st_rdev == 0)
+ continue;
+
+ dn = strappend(temporary_mount, d);
+ if (!dn) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ mac_selinux_create_file_prepare(d, st.st_mode);
+ r = mknod(dn, st.st_mode, st.st_rdev);
+ mac_selinux_create_file_clear();
+
+ if (r < 0) {
+ r = -errno;
+ goto fail;
+ }
+ }
+
+ dev_setup(temporary_mount);
+
+ if (mount(dev, "/dev/", NULL, MS_MOVE, NULL) < 0) {
+ r = -errno;
+ goto fail;
+ }
+
+ rmdir(dev);
+ rmdir(temporary_mount);
+
+ return 0;
+
+fail:
+ if (devpts)
+ umount(devpts);
+
+ if (devshm)
+ umount(devshm);
+
+ if (devhugepages)
+ umount(devhugepages);
+
+ if (devmqueue)
+ umount(devmqueue);
+
+ umount(dev);
+ rmdir(dev);
+ rmdir(temporary_mount);
+
+ return r;
+}
+
+static int mount_kdbus(BindMount *m) {
+
+ char temporary_mount[] = "/tmp/kdbus-dev-XXXXXX";
+ _cleanup_free_ char *basepath = NULL;
+ _cleanup_umask_ mode_t u;
+ char *busnode = NULL, *root;
+ struct stat st;
+ int r;
+
+ assert(m);
+
+ u = umask(0000);
+
+ if (!mkdtemp(temporary_mount))
+ return log_error_errno(errno, "Failed create temp dir: %m");
+
+ root = strappenda(temporary_mount, "/kdbus");
+ (void)mkdir(root, 0755);
+ if (mount("tmpfs", root, "tmpfs", MS_NOSUID|MS_STRICTATIME, "mode=777") < 0) {
+ r = -errno;
+ goto fail;
+ }
+
+ /* create a new /dev/null dev node copy so we have some fodder to
+ * bind-mount the custom endpoint over. */
+ if (stat("/dev/null", &st) < 0) {
+ log_error_errno(errno, "Failed to stat /dev/null: %m");
+ r = -errno;
+ goto fail;
+ }
+
+ busnode = strappenda(root, "/bus");
+ if (mknod(busnode, (st.st_mode & ~07777) | 0600, st.st_rdev) < 0) {
+ log_error_errno(errno, "mknod() for %s failed: %m", busnode);
+ r = -errno;
+ goto fail;
+ }
+
+ r = mount(m->path, busnode, "bind", MS_BIND, NULL);
+ if (r < 0) {
+ log_error_errno(errno, "bind mount of %s failed: %m", m->path);
+ r = -errno;
+ goto fail;
+ }
+
+ basepath = dirname_malloc(m->path);
+ if (!basepath) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ if (mount(root, basepath, NULL, MS_MOVE, NULL) < 0) {
+ log_error_errno(errno, "bind mount of %s failed: %m", basepath);
+ r = -errno;
+ goto fail;
+ }
+
+ rmdir(temporary_mount);
+ return 0;
+
+fail:
+ if (busnode) {
+ umount(busnode);
+ unlink(busnode);
+ }
+
+ umount(root);
+ rmdir(root);
+ rmdir(temporary_mount);
+
+ return r;
+}
+