KEY_DEFER_PERM_CHECK
key_ref = lookup_user_key(serial, flags, KEY_DEFER_PERM_CHECK);
key_ref = lookup_user_key(keyid, 0, KEY_DEFER_PERM_CHECK);
case KEY_DEFER_PERM_CHECK:
need_perm != KEY_DEFER_PERM_CHECK)
} else if (need_perm != KEY_DEFER_PERM_CHECK) {
case KEY_DEFER_PERM_CHECK:
case KEY_DEFER_PERM_CHECK: