Model Checking a Secure Hypervisor

Hyper visor is a piece of platform-virtualization software that allows multiple operating systems to run on a host computer concurrently. CAS Monitor, short for CAS Virtual Monitor, is a secure, high-assurance hyper visor prototype, which aims to level B3 or higher of TCSEC standard. This paper reports our experience of employing model checking method to verify some design properties of CAS Monitor, such as isolation, mediated sharing, communication between separated virtual machines and source control policy. We show how to specify design architecture of CAS Monitor with Spin PROMELA language and verify the above important properties to meet system security request.