Allowing ordinary users to view or change into the root directory is generally not a wise policy for multiuser systems. The reason is that it makes it easier to damage the system or obtain confidential information. This danger exists to some extent even if the permissions for the key directories and subdirectories within the root directory retain their default settings that make them inaccessible to ordinary users, because access to the root directory can provide a skilled intruder with another entry point to obtain useful clues about the structure of the particular system and to probe for weaknesses.