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The increased capabilities of modern real-time systems (RTS) expose them tovarious security threats. Recently, frameworks that integrate security taskswithout perturbing the real-time tasks have been proposed, but they only targetsingle core systems. However, modern RTS are migrating towards multicoreplatforms. This makes the problem of integrating security mechanisms morecomplex, as designers now have multiple choices for where to allocate thesecurity tasks. In this paper we propose HYDRA, a design space explorationalgorithm that finds an allocation of security tasks for multicore RTS usingthe concept of opportunistic execution. HYDRA allows security tasks to operatewith existing real-time tasks without perturbing system parameters or normalexecution patterns, while still meeting the desired monitoring frequency forintrusion detection. Our evaluation uses a representative real-time controlsystem (along with synthetic task sets for a broader exploration) to illustratethe efficacy of HYDRA.

A Design-Space Exploration for Allocating Security Tasks in Multicore Real-Time Systems