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As industry moves toward chiplet-based designs, the insertion of hardwareTrojans poses a significant threat to the security of these systems. Thesesystems rely heavily on cache coherence for coherent data communication, makingcoherence an attractive target. Critically, unlike prior work, which focusesonly on malicious packet modifications, a Trojan attack that exploits coherencecan modify data in memory that was never touched and is not owned by thechiplet which contains the Trojan. Further, the Trojan need not even bephysically between the victim and the memory controller to attack the victim'smemory transactions. Here, we explore the fundamental attack vectors possiblein chiplet-based systems and provide an example Trojan implementation capableof directly modifying victim data in memory. This work aims to highlight theneed for developing mechanisms that can protect and secure the coherence schemefrom these forms of attacks.

Hardware Trojan Threats to Cache Coherence in Modern 2.5D Chiplet Systems