Kernel Level File Integrity Checker report #3

[Efstratios Karatzas]

During week #3:

* sbin/pefs now uses an ioctl() to grab ciphertext for a symlink's target
(data of readlink()). properly handle symlinks in general and print
warnings if target of symlink is not provided in user supplied file list.
both symlink & target of symlink must be provided if user wants integrity
checking for both.

* sbin/pefs now prints clear warnings if a file has multiple hardlinks but
not all are provided in user supplied file list.

* lots of minor fixes for sbin/pefs so we can move on to mount() and focus
on kernel land.
 e.g. avoiding race conditions in most cases, check for numeric overflows,
few bug fixes, clearer errors, read input from stdin by default etc.

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Efstratios "GPF" Karatzas