[Midnightbsd-cvs] [MidnightBSD/src] b5d8aa: Fix a jail escape by a privileged user via nullfs

[Lucas Holt]

  Branch: refs/heads/stable/4.0
  Home:   https://github.com/MidnightBSD/src
  Commit: b5d8aafb6fac37ed0a8849339cf6a67e38cee27f
      https://github.com/MidnightBSD/src/commit/b5d8aafb6fac37ed0a8849339cf6a67e38cee27f
  Author: Lucas Holt <luke at foolishgames.com>
  Date:   2026-01-27 (Tue, 27 Jan 2026)

  Changed paths:
    M sys/fs/cd9660/cd9660_lookup.c
    M sys/fs/fuse/fuse_vnops.c
    M sys/fs/nullfs/null_vnops.c
    M sys/fs/smbfs/smbfs_vnops.c
    M sys/fs/unionfs/union_vnops.c
    M sys/kern/uipc_mqueue.c
    M sys/kern/vfs_cache.c
    M sys/kern/vfs_lookup.c
    M sys/kern/vfs_vnops.c
    M sys/sys/namei.h
    M tests/sys/kern/Makefile
    A tests/sys/kern/jail_lookup_root.c

  Log Message:
  -----------
  Fix a jail escape by a privileged user via nullfs

Obtained from: FreeBSD



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