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Linux NFS (v4) user namespace file permissions

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1

I am trying to set up a rootless container setup using podman and am having a problem with file permissions on NFS (running NFSv4).

Within the user namespace, I am able to create files as root on any filesystem, and to change ownership on any local filesystem, but not on a NFS mounted filesystem. Outside of the user namespace, as real root, I am able to change ownership of the same file to either a real or mapped UID.

Using buildah unshare to enter the user namespace:

> cat /etc/subuid
bruce:1065536:65536

> date > /local/testfile
> buildah unshare chown 250:250 /local/testfile
> ls -l /local/testfile
-rw-rw-r-- 1 1065785 1065785 29 May 6 11:51 /local/testfile

> date > /nfs/testfile
> buildah unshare chown 250:250 /nfs/testfile
chown: changing ownership of '/nfs/testfile': Operation not permitted
ERRO[0000] exit status 1 
ERRO[0000] exit status 1 
> sudo chown 1065785:1065785 /nfs/testfile
Password: 
> ls -l /nfs/testfile
-rw-rw-r-- 1 1065785 1065785 29 May 6 11:51 /nfs/testfile

What might I be missing here?

linux nfs nfs4 namespaces

share|improve this question

asked May 7 at 17:46

BruceBruce

62

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The line in /etc/fstab is simply server:/home /home nfs _netdev,fsc 0 0. The mount line recorded in /proc/mounts are: rw,relatime,vers=4.0,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp6,timeo=600,retrans=2,sec=sys,clientaddr=fd12:3456::abcd,fsc,local_lock=none,addr=fd12:3456::2222 (IPs changed)
  
  – Bruce
  May 7 at 21:28
  
  

  
  
  
  

add a comment | 

1

I am trying to set up a rootless container setup using podman and am having a problem with file permissions on NFS (running NFSv4).

Within the user namespace, I am able to create files as root on any filesystem, and to change ownership on any local filesystem, but not on a NFS mounted filesystem. Outside of the user namespace, as real root, I am able to change ownership of the same file to either a real or mapped UID.

Using buildah unshare to enter the user namespace:

> cat /etc/subuid
bruce:1065536:65536

> date > /local/testfile
> buildah unshare chown 250:250 /local/testfile
> ls -l /local/testfile
-rw-rw-r-- 1 1065785 1065785 29 May 6 11:51 /local/testfile

> date > /nfs/testfile
> buildah unshare chown 250:250 /nfs/testfile
chown: changing ownership of '/nfs/testfile': Operation not permitted
ERRO[0000] exit status 1 
ERRO[0000] exit status 1 
> sudo chown 1065785:1065785 /nfs/testfile
Password: 
> ls -l /nfs/testfile
-rw-rw-r-- 1 1065785 1065785 29 May 6 11:51 /nfs/testfile

What might I be missing here?

linux nfs nfs4 namespaces

share|improve this question

asked May 7 at 17:46

BruceBruce

62

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The line in /etc/fstab is simply server:/home /home nfs _netdev,fsc 0 0. The mount line recorded in /proc/mounts are: rw,relatime,vers=4.0,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp6,timeo=600,retrans=2,sec=sys,clientaddr=fd12:3456::abcd,fsc,local_lock=none,addr=fd12:3456::2222 (IPs changed)
  
  – Bruce
  May 7 at 21:28
  
  

  
  
  
  

add a comment | 

I am trying to set up a rootless container setup using podman and am having a problem with file permissions on NFS (running NFSv4).

Within the user namespace, I am able to create files as root on any filesystem, and to change ownership on any local filesystem, but not on a NFS mounted filesystem. Outside of the user namespace, as real root, I am able to change ownership of the same file to either a real or mapped UID.

Using buildah unshare to enter the user namespace:

> cat /etc/subuid
bruce:1065536:65536

> date > /local/testfile
> buildah unshare chown 250:250 /local/testfile
> ls -l /local/testfile
-rw-rw-r-- 1 1065785 1065785 29 May 6 11:51 /local/testfile

> date > /nfs/testfile
> buildah unshare chown 250:250 /nfs/testfile
chown: changing ownership of '/nfs/testfile': Operation not permitted
ERRO[0000] exit status 1 
ERRO[0000] exit status 1 
> sudo chown 1065785:1065785 /nfs/testfile
Password: 
> ls -l /nfs/testfile
-rw-rw-r-- 1 1065785 1065785 29 May 6 11:51 /nfs/testfile

What might I be missing here?

linux nfs nfs4 namespaces

share|improve this question

asked May 7 at 17:46

BruceBruce

62

> cat /etc/subuid
bruce:1065536:65536

> date > /local/testfile
> buildah unshare chown 250:250 /local/testfile
> ls -l /local/testfile
-rw-rw-r-- 1 1065785 1065785 29 May 6 11:51 /local/testfile

> date > /nfs/testfile
> buildah unshare chown 250:250 /nfs/testfile
chown: changing ownership of '/nfs/testfile': Operation not permitted
ERRO[0000] exit status 1 
ERRO[0000] exit status 1 
> sudo chown 1065785:1065785 /nfs/testfile
Password: 
> ls -l /nfs/testfile
-rw-rw-r-- 1 1065785 1065785 29 May 6 11:51 /nfs/testfile

share|improve this question

asked May 7 at 17:46

BruceBruce

62

share|improve this question

asked May 7 at 17:46

BruceBruce

62

asked May 7 at 17:46

BruceBruce

62

asked May 7 at 17:46

BruceBruce

62