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This is really a design decision, it's not really clear that changing
the expected behavior here is going to provide a good experience for
operators. We punt on various classes of potential DOS (like api rate
limiting).

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

** Changed in: nova
   Importance: High => Wishlist

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https://bugs.launchpad.net/bugs/1501808

Title:
  Enabling soft-deletes opens a DOS on compute hosts

Status in OpenStack Compute (nova):
  Won't Fix
Status in OpenStack Security Advisory:
  Won't Fix

Bug description:
  If the user sets reclaim_instance_interval to anything other than 0,
  then when a user requests an instance delete, it will instead be soft
  deleted. Soft delete explicitly releases the user's quota, but does
  not release the instance's resources until period task
  _reclaim_queued_deletes runs with a period of
  reclaim_instance_interval seconds.

  A malicious authenticated user can repeatedly create and delete
  instances without limit, which will consume resources on the host
  without consuming their quota. If done quickly enough, this will
  exhaust host resources.

  I'm not entirely sure what to suggest in remediation, as this seems to
  be a deliberate design. The most obvious fix would be to not release
  quota until the instance is reaped, but that would be a significant
  change in behaviour.

  This is very similar to https://bugs.launchpad.net/bugs/cve/2015-3280
  , except that we do it deliberately.

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