redhat - What are these zero-length files created by Apache in the tmp directory?

Any ideas on why apache (httpd) creates these files in /tmp? I'm on Redhat 5.5 and Apache 2.2, mpm-prefork.

-rw-------. 1 apache   apache       0 Aug 14 12:46 filec1puD5
-rw-------. 1 apache   apache       0 Aug 14 12:46 fileKJqaih
-rw-------. 1 apache   apache       0 Aug 14 12:46 fileB7j9Ws

-rw-------. 1 apache   apache       0 Aug 14 12:46 file1o7MCE
-rw-------. 1 apache   apache       0 Aug 14 12:46 filefqAvjQ
-rw-------. 1 apache   apache       0 Aug 14 12:46 filexjpv01

Sometimes, I see dozens of these, and I always delete them, but haven't found anything on why or how these files are generated in the first place. Error logs look clean, albeit, they're set to Error.

Update: Application is Drupal 7, running on PHP 5.3.2.

Answer

/tmp is PHP's default folder for session data. You can change this by editing the "session_save_path" in your php.ini file. The being said, various scripts could write various session data here.

There are cases where lax permissions in this folder have led to vulnerabilities (UID/Symlink attacks), so if you suspect these files don't line up with what your PHP application is expected to be doing, I might recommend redirecting your PHP sesion files and watching this area closely.

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