[Bug 214488] mqueuefs mq_setattr() leaks stack memory

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214488

--- Comment #1 from commit-hook at freebsd.org ---
A commit references this bug:

Author: kib
Date: Mon Nov 14 13:20:10 UTC 2016
New revision: 308642
URL: https://svnweb.freebsd.org/changeset/base/308642

Log:
  Initialize reserved bytes in struct mq_attr and its 32compat
  counterpart, to avoid kernel stack content leak in kmq_setattr(2)
  syscall.  Also slightly simplify the checks around copyout()s.

  Reported by:  Vlad Tsyrklevich <vlad902+spam at gmail.com>
  PR:   214488
  MFC after:    1 week

Changes:
  head/sys/kern/uipc_mqueue.c

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