canonical-ubuntu-qa team mailing list archive

[Paride Legovini <2063214@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

We hit this while running src:autopkgtest autopackage tests
(d/t/unshare), but other packages may be affected too. In short: this
works on my Noble laptop:

paride@ossimoro:~$ cat /etc/subuid
paride:100000:65536
paride@ossimoro:~$ cat /etc/subgid
paride:100000:65536

paride@ossimoro:~$ unshare --map-auto --map-root-user
root@ossimoro:~# id
uid=0(root) gid=0(root) groups=0(root),65534(nogroup)
root@ossimoro:~# su -c id
uid=0(root) gid=0(root) groups=0(root)

However, in a Noble amd64 testbed VM (running in lcy02):

ubuntu@autopkgtest:~$ cat /etc/subuid
ubuntu:100000:65536
ubuntu@autopkgtest:~$ cat /etc/subgid
ubuntu:100000:65536

ubuntu@autopkgtest:~$ unshare --map-auto --map-root-user
root@autopkgtest:~# id
uid=0(root) gid=0(root) groups=0(root),65534(nogroup)
root@autopkgtest:~# su -c id
su: cannot set groups: Operation not permitted
root@autopkgtest:~# echo $?
1

I am currently unable to tell what differs between the two systems.

** Affects: auto-package-testing
     Importance: Undecided
         Status: New

** Description changed:

  We hit this while running src:autopkgtest autopackage tests
  (d/t/unshare), but other packages may be affected too. In short: this
  works on my Noble laptop:
  
  paride@ossimoro:~$ cat /etc/subuid
  paride:100000:65536
  paride@ossimoro:~$ cat /etc/subgid
  paride:100000:65536
  
  paride@ossimoro:~$ unshare --map-auto --map-root-user
  root@ossimoro:~# id
  uid=0(root) gid=0(root) groups=0(root),65534(nogroup)
  root@ossimoro:~# su -c id
  uid=0(root) gid=0(root) groups=0(root)
  
- However, in a Noble arm64 testbed VM (running in lcy02):
+ However, in a Noble amd64 testbed VM (running in lcy02):
  
  ubuntu@autopkgtest:~$ cat /etc/subuid
  ubuntu:100000:65536
  ubuntu@autopkgtest:~$ cat /etc/subgid
  ubuntu:100000:65536
  
  ubuntu@autopkgtest:~$ unshare --map-auto --map-root-user
  root@autopkgtest:~# id
  uid=0(root) gid=0(root) groups=0(root),65534(nogroup)
  root@autopkgtest:~# su -c id
  su: cannot set groups: Operation not permitted
  root@autopkgtest:~# echo $?
  1
  
  I am currently unable to tell what differs between the two systems.

-- 
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https://bugs.launchpad.net/bugs/2063214

Title:
  unshare(1) fails within testbed VMs

Status in Auto Package Testing:
  New

Bug description:
  We hit this while running src:autopkgtest autopackage tests
  (d/t/unshare), but other packages may be affected too. In short: this
  works on my Noble laptop:

  paride@ossimoro:~$ cat /etc/subuid
  paride:100000:65536
  paride@ossimoro:~$ cat /etc/subgid
  paride:100000:65536

  paride@ossimoro:~$ unshare --map-auto --map-root-user
  root@ossimoro:~# id
  uid=0(root) gid=0(root) groups=0(root),65534(nogroup)
  root@ossimoro:~# su -c id
  uid=0(root) gid=0(root) groups=0(root)

  However, in a Noble amd64 testbed VM (running in lcy02):

  ubuntu@autopkgtest:~$ cat /etc/subuid
  ubuntu:100000:65536
  ubuntu@autopkgtest:~$ cat /etc/subgid
  ubuntu:100000:65536

  ubuntu@autopkgtest:~$ unshare --map-auto --map-root-user
  root@autopkgtest:~# id
  uid=0(root) gid=0(root) groups=0(root),65534(nogroup)
  root@autopkgtest:~# su -c id
  su: cannot set groups: Operation not permitted
  root@autopkgtest:~# echo $?
  1

  I am currently unable to tell what differs between the two systems.

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