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Subject: [Bug 222039] Incorrect 32-bit emulation of SCM_BINTIME and
 SCM_TIMESTAMP
Date: Thu, 07 Sep 2017 04:31:00 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D222039

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

Author: sobomax
Date: Thu Sep  7 04:29:57 UTC 2017
New revision: 323254
URL: https://svnweb.freebsd.org/changeset/base/323254

Log:
  In the recvmsg32() system call iterate over returned structure(s)
  and convert any messages of types SCM_BINTIME, SCM_TIMESTAMP,
  SCM_REALTIME and SCM_MONOTONIC from 64-bit to its 32-bit
  representation. Otherwise we either run out of user-supplied
  buffer to copy those out resulting in the MSG_CTRUNC or simply
  return values that the userland 32-bit code is not going
  to parse correctly. This fixes at least two regression tests
  failing to function properly in 32-bit compat mode:

      tools/regression/sockets/udp_pingpong
      tools/regression/sockets/unix_cmsg

  PR:             kern/222039
  MFC after:    30 days

Changes:
  head/sys/compat/freebsd32/freebsd32.h
  head/sys/compat/freebsd32/freebsd32_misc.c

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