Ryan Libby 13d4f96130 shared shadow vm object invalidation regression test
Add a regression test for a scenario where a shadow vm object is shared
by multiple mappings.  If a page COW occurs through one of the mappings,
then the virtual-to-physical mapping may become invalidated.

This tests the scenario from CVE-2021-29626 which was fixed by
982693bb729badac4e65ecd59772979f2849a2b2.

Reviewed by:	markj
Sponsored by:	Dell EMC Isilon
2021-04-07 12:39:05 -07:00
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