Andy Kurth created VCL-1083:
-------------------------------
Summary: Data in shares mounted under Linux home directories may
be deleted
Key: VCL-1083
URL: https://issues.apache.org/jira/browse/VCL-1083
Project: VCL
Issue Type: Bug
Components: vcld (backend)
Affects Versions: 2.5
Reporter: Andy Kurth
Assignee: Andy Kurth
Fix For: 2.5.1
This issue mainly affects the new _Site Configuration > NFS Mounts_ feature
introduced in VCL 2.5. This feature allows you to specify one or more shares to
be automatically mounted on the computer prior to the user logging in. These
shares get mounted when the computer is reserved. One of the main benefits of
this feature is that it allows NFS shares to be mounted under the home
directory of the local user created for the reservation.
If the user never logs in to the reservation, the computer is _sanitized_
rather than being fully reloaded under most circumstances. The _sanitization_
process involves deleting the local user account and associated home directory
created for the user who never logged in.
Unfortunately, in VCL 2.5 the call to delete the user account and the call to
unmount any shares mounted for the _NFS Mounts_ feature are in the wrong order.
An attempt is made to delete the user account first and then unmount the
shares.
This is sort of a problem because the Linux *userdel* command tries to
recursively and indiscriminately delete the home directory and everything
underneath when passed the -r/--remove argument. There's apparently no check
to see if any shares are mounted. (This would make sense since the _userdel_
ultimately will fail if a share is mounted since it is unable to delete the
mount point directory.) The end result is the home directory and mount point
directory(ies) remain but everything underneath including files under the
mounted share(s) that the local root account has write access to are deleted.
The following appears in vcld.log when this problems occurs:
{noformat}
|timeout|Linux.pm:delete_user|3134| ---- WARNING ----
|timeout|Linux.pm:delete_user|3134| 2017-11-15
15:15:26|timeout|Linux.pm:delete_user|3134|failed to delete user '<username>'
from <computer>, command: '/usr/sbin/userdel -r <username>', exit status: 12,
output:
|timeout|Linux.pm:delete_user|3134| userdel: error removing directory
/home/<username>
|timeout|Linux.pm:delete_user|3134| ( 0) Linux.pm, delete_user (line: 3134)
|timeout|Linux.pm:delete_user|3134| (-1) OS.pm, delete_user_accounts (line: 549)
|timeout|Linux.pm:delete_user|3134| (-2) Linux.pm, sanitize (line: 1501)
|timeout|Linux.pm:delete_user|3134| (-3) reclaim.pm, call_os_sanitize (line:
319)
|timeout|Linux.pm:delete_user|3134| (-4) reclaim.pm, process (line: 190)
|timeout|Linux.pm:delete_user|3134| (-5) vcld, make_new_child (line: 601)
|timeout|Linux.pm:delete_user|3134| (-6) vcld, main (line: 353)
{noformat}
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