When a transaction is committed, C Xenstored will first check
the quota is correct before attempting to commit any nodes. It would
be possible that accounting is temporarily negative if a node has
been removed outside of the transaction.
Unfortunately, some versions of C Xenstored are assuming that the
quota cannot be negative and are using assert() to confirm it. This
will lead to C Xenstored crash when tools are built without -DNDEBUG
(this is the default).
Common Attack Pattern Enumeration and Classification (CAPEC)
CAPEC-ID: CAPEC Description: A malicious guest could craft a transaction that will hit the C
Xenstored bug and crash it. This will result to the inability to
perform any further domain administration like starting new guests,
or adding/removing resources to or from any existing guest.