some third party libraries do not respect the directorypermissions config setting

[Hugh Davenport]

one example is htmlpurifier, from a git grep mkdir, i see that pear, dwoo, adobdb, and flowplayer may also be culprits

Also, the internal examples
- extract function in artefact/file.lib.php
- copyr function in lib/file.php
- there is one instance in lib/db/upgrade.php

[Aaron Wells (u-aaronw)]

The examples that Hugh mentions in internal Mahara code were all patched as part of Bug 1057238. But there are still some mkdir's in these /lib subdirectories:

adodb
csstidy
dwoo
htmlpurifier
pear