Theres absolutely no control over session.save_path parameter in php. By
setting it to every directory he wants, every user can:

1. (!!!) Absolutely easily generate new sessions with any content for every
site on server.
2. Delete other users sessions by setting gc to 100 and probably legal files
starting with sess_*.
3. Flood every http server writable directory with thousands or millions
files.

session.save_path should be controlled under open_basedir variable or some
other mechanism.

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