[Bug 1085196] [NEW] chown to file on NFS4 changes owner to "nobody"

[Chris Johnson]

Public bug reported:

Linux blackboard 3.5.0-19-generic #30-Ubuntu SMP Tue Nov 13 17:48:01 UTC
2012 x86_64 x86_64 x86_64 GNU/Linux

cjohnson at blackboard:~$ more /etc/lsb-release 
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=12.10
DISTRIB_CODENAME=quantal
DISTRIB_DESCRIPTION="Ubuntu 12.10"

Summary:
chown by root on a nfs4 mounted directory changes the owner to nobody
chgroup by root on a nfs4 mounted directory changes the group to nogroup

How to duplicate
Set up a NFS4 server.

# mount -t nfs4 server:cjohnson /home/cjohnson
# touch /home/cjohnson/junk
# ls -l /home/cjohnson/junk
-rw-rw-r-- 1 root root 0 Nov 30 15:36 /home/cjohnson/junk
# chown cjohnson.cjohnson /home/cjohnson/junk
# ls -l /home/cjohnson/junk
-rw-rw-r-- 1 nobody nogroup 0 Nov 30 15:36 /home/cjohnson/junk

# rm /home/cjohnson/junk
# umount /home/cjohnson
# mount server:/home/cjohnson /home/cjohnson # NFS v3
(everything works as it should)

This behavior changed on upgrade from 12.04 to 12.10.

LDAP is turned off, autofs is turned off but those WERE used prior to
this bug being discovered.  UIDs and GIDs match on server and client.

** Affects: nfs-utils (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1085196

Title:
  chown to file on NFS4 changes owner to "nobody"

Status in “nfs-utils” package in Ubuntu:
  New

Bug description:
  Linux blackboard 3.5.0-19-generic #30-Ubuntu SMP Tue Nov 13 17:48:01
  UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

  cjohnson at blackboard:~$ more /etc/lsb-release 
  DISTRIB_ID=Ubuntu
  DISTRIB_RELEASE=12.10
  DISTRIB_CODENAME=quantal
  DISTRIB_DESCRIPTION="Ubuntu 12.10"

  Summary:
  chown by root on a nfs4 mounted directory changes the owner to nobody
  chgroup by root on a nfs4 mounted directory changes the group to nogroup

  How to duplicate
  Set up a NFS4 server.

  # mount -t nfs4 server:cjohnson /home/cjohnson
  # touch /home/cjohnson/junk
  # ls -l /home/cjohnson/junk
  -rw-rw-r-- 1 root root 0 Nov 30 15:36 /home/cjohnson/junk
  # chown cjohnson.cjohnson /home/cjohnson/junk
  # ls -l /home/cjohnson/junk
  -rw-rw-r-- 1 nobody nogroup 0 Nov 30 15:36 /home/cjohnson/junk

  # rm /home/cjohnson/junk
  # umount /home/cjohnson
  # mount server:/home/cjohnson /home/cjohnson # NFS v3
  (everything works as it should)

  This behavior changed on upgrade from 12.04 to 12.10.

  LDAP is turned off, autofs is turned off but those WERE used prior to
  this bug being discovered.  UIDs and GIDs match on server and client.

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