[Bug 1795772] Re: rmdir on non-empty samba directory fails silently

[Rolando Gorgs]

Hello Andreas,
this answer makes me calm me down. I thought for a second bionic has been forgotten. And yes, this bug is indeed very very annoying. I'm surprised that I'm the first one who reports this. Probably most affected users don't even noticed yet that they are constantly leaving a mess in their shares. This bug also produced (minor) financial losses and major disputes and extra work in our office because people used wrong (allegedly deleted) data files for weeks instead of the right ones. You can imagine I'm really looking forward to this bug be fixed. :) So thank you very much for your efforts.

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Title:
  rmdir on non-empty samba directory fails silently

Status in samba:
  Unknown
Status in samba package in Ubuntu:
  Fix Released
Status in samba source package in Bionic:
  In Progress

Bug description:
  [Impact]

  The samba client doesn't check the result of rmdir, returning success
  when the directory is not empty. This results in clients reporting
  successful directory removal when in fact the directory was not
  removed.

  This bug affects anything that uses the samba client, including file
  managers, mount, and gvfs.

  [Test Case]

  # lxc launch ubuntu-daily:cosmic sambatest
  # lxc exec sambatest bash

  Inside container:

  # apt update
  # apt dist-upgrade -y
  # apt install -y samba samba-client
  # mkdir -p /tmp/shared/testdir/testsubdir
  # chown -R nobody:nogroup /tmp/shared
  # printf "%s" "[global]
      workgroup = WORKGROUP
      server role = standalone server
      security = user
      map to guest = Bad User
      guest ok = yes
      guest only = yes
      guest account = nobody
  [shared]
      path = /tmp/shared
      writable = yes
      browsable = yes
      guest ok = yes
  " | tee "/etc/samba/smb.conf" >/dev/null
  # service smbd restart

  # CLI_FORCE_INTERACTIVE=yes smbclient -U " "%" " //localhost/shared <<EOF
  rmdir testdir
  quit
  EOF

  * Should get NT_STATUS_DIRECTORY_NOT_EMPTY

  [Upstream Report and Fix]

  https://bugzilla.samba.org/show_bug.cgi?id=13204

  https://attachments.samba.org/attachment.cgi?id=14408

  [Regression Potential]

  If the fix is implemented incorrectly, clients may receive false error
  messages, and report failure even on success when removing
  directories.

  [Original Description]

  When you delete a non-empty directory in Nautilus or Nemo, the Folder-
  Icon disappears and stays away but when you refresh the current
  directory or navigate back there it reappears. No error message at
  all. This bug is very annoying in two ways:

  1) When you only have smb access to the share you have to delete all
  files and directories in sub, subsub and subsubsubdirecories by hand
  to actually delete a directory.

  2) You don't get warned that the delete operation failed. In our case
  this produced a horrible mess in our shares before we recognized what
  was going wrong.

  You can find many people complaining in various forums. I found bug
  reports in bugtrackers of Nemo, Nautilus and Gnome but the root seems
  to be this (upstream fixed) bug in samba:

  https://bugzilla.samba.org/show_bug.cgi?id=13204

  Please cherry pick the fix into current version of samba.

  Thanks a lot for your help!

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