return -EPERM;
}
+ /* Another safe-check. Removing "/path/.." could easily remove entire root as well.
+ * It's especially easy to do using globs in tmpfiles, like "/path/.*", which the glob()
+ * function expands to both "/path/." and "/path/..".
+ * Return -EINVAL to be consistent with rmdir("/path/."). */
+ if (endswith(path, "/..") || endswith(path, "/../"))
+ return -EINVAL;
+
if ((flags & (REMOVE_SUBVOLUME|REMOVE_ROOT|REMOVE_PHYSICAL)) == (REMOVE_SUBVOLUME|REMOVE_ROOT|REMOVE_PHYSICAL)) {
/* Try to remove as subvolume first */
r = btrfs_subvol_remove(path, BTRFS_REMOVE_RECURSIVE|BTRFS_REMOVE_QUOTA);