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[Alan Pevec <1206081@xxxxxxxxxxxxxxxxxx>]

** Changed in: nova/havana
     Assignee: (unassigned) => Pádraig Brady (p-draigbrady)

** Changed in: nova/folsom
       Status: In Progress => Won't Fix

** Tags removed: in-stable-havana

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https://bugs.launchpad.net/bugs/1206081

Title:
  [OSSA 2013-029] Unchecked qcow2 root disk sizes DoS

Status in OpenStack Compute (Nova):
  Fix Released
Status in OpenStack Compute (nova) folsom series:
  Won't Fix
Status in OpenStack Compute (nova) grizzly series:
  Fix Committed
Status in OpenStack Compute (nova) havana series:
  Fix Committed
Status in OpenStack Security Advisories:
  Fix Released

Bug description:
  When doing QA for SUSE on bug 1177830
  I found that the fix is incomplete,
  because it assumed that the cached image would be mostly sparse.

  However, I can easily create non-sparse small compressed qcow2 images
  with

  perl -e 'for(1..11000){print "x" x 1024000}' > img
  qemu-img convert -c -O qcow2 img img.qcow2
  glance image-create --name=11gb --is-public=True --disk-format=qcow2 --container-format=bare < img.qcow2
  nova boot --image 11gb --flavor m1.small testvm

  which (in Grizzly and Essex) results in one (or two in Essex) 11GB large files being created in /var/lib/nova/instances/_base/
  still allowing attackers to fill up disk space of compute nodes
  because the size check is only done after the uncompressing / caching

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