The list of those "certain files" is not hard coded into ureadahead but
is gathered by checking which files are accessed when booting and then
saving that file list onto the hard drive. So if the encrypted partition
is mounted early enough, ureadahead saves a list of files on that
partition elsewhere, unencrypted.

I'm not that much into crypto analysis, so I can't tell how important
this little known plain-text is in cracking the encryption. But I can
imagine lots of encryption applications where even the exposure of the
names of the encrypted files is a severe security breach.

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https://bugs.launchpad.net/bugs/782646

Title:
  ureadahead creates unwanted pack files (tmpfs, encrypted partitions)

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