[Bug 217435] Users can panic the kernel by tracing kevents with unusual arguments.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217435

--- Comment #4 from commit-hook at freebsd.org ---
A commit references this bug:

Author: kib
Date: Sun Mar 19 15:56:06 UTC 2017
New revision: 315562
URL: https://svnweb.freebsd.org/changeset/base/315562

Log:
  MFC r315155:
  Ktracing kevent(2) calls with unusual arguments might leads to an
  overly large allocation requests.

  PR:   217435

Changes:
_U  stable/10/
  stable/10/sys/kern/kern_event.c
  stable/10/sys/kern/kern_ktrace.c
  stable/10/sys/sys/ktrace.h

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