[Bug 1733101] [NEW] nfs-kernel-server ignores no_root_squash option

[Michal Kukuča]

Public bug reported:

I'm using Ubuntu Server 16.04.3

Apt reports:
nfs-kernel-server/xenial-updates,now 1:1.2.8-9ubuntu12.1 amd64 [installed]

/etc/exports contains the following line:
/export *(rw,fsid=0,crossmnt,insecure,no_root_squash,sync,no_subtree_check,sec=krb5p:krb5i:krb5)

There are no errors reported either in journal, or with systemctl. /var/lib/nfs/etab contains:
/export	*(rw,sync,wdelay,hide,crossmnt,insecure,no_root_squash,no_all_squash,no_subtree_check,secure_locks,acl,fsid=0,anonuid=65534,anongid=65534,sec=krb5p:krb5i:krb5,rw,no_root_squash,no_all_squash)

Regardless of that, I'm unable to get root access to the mounted
filesystem on the client.

This bug may be related to these ones over at Debian:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=833925
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=783212

This bug can create a lot of issues when using autofs on /home with a
Ubuntu client. Every time the client tries to do something that requires
super-user privileges, the machine will hang for several minutes, until
the attempt times out. This is most probably directly related to another
bug, that I reported earlier here:
https://bugs.launchpad.net/ubuntu/+source/autofs/+bug/1728055

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

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https://bugs.launchpad.net/bugs/1733101

Title:
  nfs-kernel-server ignores no_root_squash option

Status in nfs-utils package in Ubuntu:
  New

Bug description:
  I'm using Ubuntu Server 16.04.3

  Apt reports:
  nfs-kernel-server/xenial-updates,now 1:1.2.8-9ubuntu12.1 amd64 [installed]

  /etc/exports contains the following line:
  /export *(rw,fsid=0,crossmnt,insecure,no_root_squash,sync,no_subtree_check,sec=krb5p:krb5i:krb5)

  There are no errors reported either in journal, or with systemctl. /var/lib/nfs/etab contains:
  /export	*(rw,sync,wdelay,hide,crossmnt,insecure,no_root_squash,no_all_squash,no_subtree_check,secure_locks,acl,fsid=0,anonuid=65534,anongid=65534,sec=krb5p:krb5i:krb5,rw,no_root_squash,no_all_squash)

  Regardless of that, I'm unable to get root access to the mounted
  filesystem on the client.

  This bug may be related to these ones over at Debian:
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=833925
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=783212

  This bug can create a lot of issues when using autofs on /home with a
  Ubuntu client. Every time the client tries to do something that
  requires super-user privileges, the machine will hang for several
  minutes, until the attempt times out. This is most probably directly
  related to another bug, that I reported earlier here:
  https://bugs.launchpad.net/ubuntu/+source/autofs/+bug/1728055

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