Securing Interaction between Threads and the Scheduler

Abstract

The problem of information flow in multithreaded programs remains an important open challenge. Existing approaches to specifying and enforcing information flow security often suffer from over-restrictiveness, relying on non-standard semantics, lack of compositionality, inability to handle dynamic threads, scheduler dependence, and efficiency overhead for code that results from security-enforcing transformations. This paper suggests a remedy for some of these shortcomings by developing a novel treatment of the interaction between threads and the scheduler. As a result, we present a permissive noninterference-like security specification and a compositional security type system that provably enforces this specification. The type system guarantees security for a wide class of schedulers and provides a flexible and efficiency-friendly treatment of dynamic threads