control_stdin(GIOChannel *gio, GIOCondition condition) {
    (void) condition;
    gchar *ctl_line = NULL;
    GIOStatus ret;

    ret = g_io_channel_read_line(gio, &ctl_line, NULL, NULL, NULL);
    if ( (ret == G_IO_STATUS_ERROR) || (ret == G_IO_STATUS_EOF) )
        return FALSE;

    parse_cmd_line(ctl_line, NULL);
    g_free(ctl_line);

    return TRUE;
}

This category addresses vulnerabilities caused by flawed access control mechanisms, where incorrect permission settings allow unauthorized users to access restricted resources.