[PVE-User] Fun with LVM storage

[Eneko Lacunza]

Hi all,

We have just deleted a template VM (id 100) in a Proxmox 3.4-6 host. 
After that we have created a new VM (id 100), with 2 disks. I don't 
think the ID is important.

Storage is the same LVM for both.

When installing a new Debian in the new VM, we have noticed that old 
image's LVs are seen from the new VM. This means that new VM is getting 
the data blocks from the deleted VM.

I think this is exposing a data leak between VMs using LVM storage, and 
that a data zeroing should be performed when deleting (best) or creating 
(sufficient) a LVM disk.

What do you think?

Regards
Eneko

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