o First pass at an inter-process authorization regression testing suite.

  This test utility attempts to evaluate the current kernel policy
  for authorization inter-process activities, currently ptrace(),
  kill(, SIGHUP), getpriority(), and setpriority().  The utility creates
  pairs of processes, initializes their credential sets to useful
  cases, and reports on whether the results are in keeping with hard-coded
  safety expectations.

o Currently, this utility relies on the availability of __setugid(),
  an uncomitted system call used for managing the P_SUGID bit.  Due to
  continuing discussion of optional regression testing kernel components
  ("options REGRESSION") I'll hold off on committing that until the
  discussion has reached its natural termination.

o A number of additional testing factors should be taken into account
  in the testing, including tests for different classes of signals,
  interactions with process session characteristics, I/O signalling,
  broadcast activities such as broadcast signalling, mass priority
  setting, and to take into group-related aspects of credentials.
  Additional operations should also be taken into account, such as ktrace,
  debugging attach using procfs, and so on.

o This testing suite is intended to prevent the introduction of bugs
  in the upcoming sets of authorization changes associated with the
  introduction of process capabilities and mandatory access control.

Obtained from: TrustedBSD Project

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