Correctness and security at odds: Post-silicon validation of modern SoC designs

We consider the conflicts between requirements from security and post-silicon validation in SoC designs. Post-silicon validation requires hardware instrumentations to provide observability and controllability during on-field execution; this in turn makes the system prone to security vulnerabilities, resulting in potentially subtle security exploits. Mitigating such threats while ensuring that the system is amenable to post-silicon validation is challenging, involving close collaboration among security, validation, testing, and computer architecture teams. We examine the state of the practice in this area, the trade-offs and compromises made, and their limitations. We also discuss an emerging approach that we are contemplating to address this problem.