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kib
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2015-10-20T20:38:20.525588Z
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Trim spaces at end of line to record the proper commit message for
r289660:

Do not allow to execute ptrace(PT_TRACE_ME) when the process is
already traced.

Do not allow to execute ptrace(PT_TRACE_ME) when there is no parent
which can trace the process, i.e. when the parent is already init.
Note that after the PT_TRACE_ME request the process is unkillable and
non-continuable until a debugger is attached, or parent is killed, the
later clears P_TRACED state.  Since init clearly would not debug the
caller, and cannot be killed, disallow creation of unkillable
processes.

Reviewed by:	jhb, pho
Reported and tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	2 weeks
Differential revision:	https://reviews.freebsd.org/D3908

END