Language: C
Label: vulnerable
CWE: CWE-22 \u2014 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Code:
static void fio_cluster_signal_children(void) {
  if (fio_parent_pid() != getpid()) {
    fio_stop();
    return;
  }
  fio_cluster_server_sender(fio_msg_internal_create(0, FIO_CLUSTER_MSG_SHUTDOWN,
                                                    (fio_str_info_s){.len = 0},
                                                    (fio_str_info_s){.len = 0},
                                                    0, 1),
                            -1);
}