[Bug 248335] O_BENEATH leaks information about parent directories

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248335

--- Comment #6 from commit-hook at FreeBSD.org ---
A commit references this bug:

Author: kib
Date: Tue Sep 22 22:48:13 UTC 2020
New revision: 366022
URL: https://svnweb.freebsd.org/changeset/base/366022

Log:
  Add O_RESOLVE_BENEATH and AT_RESOLVE_BENEATH to mimic Linux' RESOLVE_BENEATH.

  It is like O_BENEATH, but disables to walk out of the subtree rooted
  in the starting directory. O_BENEATH does not care if path walks out
  if it returned.

  Requested by: Dan Gohman <dev at sunfishcode.online>
  PR:   248335
  Reviewed by:  markj
  Tested by:    pho
  Sponsored by: The FreeBSD Foundation
  MFC after:    1 week
  Differential revision:        https://reviews.freebsd.org/D25886

Changes:
  head/sys/kern/vfs_lookup.c
  head/sys/kern/vfs_syscalls.c
  head/sys/kern/vfs_vnops.c
  head/sys/sys/fcntl.h
  head/sys/sys/namei.h

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