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Mobile devices are in roles where the integrity and confidentiality of theirapps and data are of paramount importance. They usually contain aSystem-on-Chip (SoC), which integrates microprocessors and peripheralIntellectual Property (IP) connected by a Network-on-Chip (NoC). Malicious IPor software could compromise critical data. Some types of attacks can beblocked by controlling data transfers on the NoC using Memory Management Units(MMUs) and other access control mechanisms. However, commodity processors donot provide strong assurances regarding the correctness of such mechanisms, andit is challenging to verify that all access control mechanisms in the systemare correctly configured. We propose a NoC Firewall (NoCF) that provides asingle locus of control and is amenable to formal analysis. We demonstrate aninitial analysis of its ability to resist malformed NoC commands, which webelieve is the first effort to detect vulnerabilities that arise from NoCprotocol violations perpetrated by erroneous or malicious IP.

Network-on-Chip Firewall: Countering Defective and Malicious System-on-Chip Hardware