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Issue No. 04 - Fourth Quarter (2012 vol. 5)
ISSN: 1939-1374
pp: 472-483
Chunxiao Li , Princeton University, Princeton
Anand Raghunathan , Purdue University, West Lafayette
Niraj K. Jha , Princeton University, Princeton
Virtualization is a rapidly evolving technology that can be used to provide a range of benefits to computing systems, including improved resource utilization, software portability, and reliability. Virtualization also has the potential to enhance security by providing isolated execution environments for different applications that require different levels of security. For security-critical applications, it is highly desirable to have a small trusted computing base (TCB), since it minimizes the surface of attacks that could jeopardize the security of the entire system. In traditional virtualization architectures, the TCB for an application includes not only the hardware and the virtual machine monitor (VMM), but also the whole management operating system (OS) that contains the device drivers and virtual machine (VM) management functionality. For many applications, it is not acceptable to trust this management OS, due to its large code base and abundance of vulnerabilities. For example, consider the "computing-as-a-service” scenario where remote users execute a guest OS and applications inside a VM on a remote computing platform. It would be preferable for many users to utilize such a computing service without being forced to trust the management OS on the remote platform. In this paper, we address the problem of providing a secure execution environment on a virtualized computing platform under the assumption of an untrusted management OS. We propose a secure virtualization architecture that provides a secure runtime environment, network interface, and secondary storage for a guest VM. The proposed architecture significantly reduces the TCB of security-critical guest VMs, leading to improved security in an untrusted management environment. We have implemented a prototype of the proposed approach using the Xen virtualization system, and demonstrated how it can be used to facilitate secure remote computing services. We evaluate the performance penalties incurred by the proposed architecture, and demonstrate that the penalties are minimal.
Virtual machine monitors, Computer security, Cloud computing, Driver circuits, Memory management, computing-as-a-service, Virtual machine, trusted computing base, memory protection, cloud computing

A. Raghunathan, C. Li and N. K. Jha, "A Trusted Virtual Machine in an Untrusted Management Environment," in IEEE Transactions on Services Computing, vol. 5, no. , pp. 472-483, 2012.
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