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Thursday, September 3 • 6:40am - 7:10am
Trusted Execution State: An Extension for Lightweight Secure Function Calling - Mark Hill, Huawei Technologies R&D (UK) Ltd

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Although Trusted Execution Environments (TEEs) can be built using the standard RISC-V machine mode as the trusted state this approach has some limitations:
- Machine mode must manage the lower privilege tasks, exceptions/interrupts and device drivers as well as managing secret data and providing trusted services. This dual use violates the security Principle of Least Privilege.
- Supporting all these mechanisms make the code large, increasing the risk of security loopholes appearing and providing more opportunity to create gadgets for ROP/JOP style attacks.
- Transitions between insecure and secure domains is inevitablly heavyweight as it must be syscall based.
This extension addresses these issues by adding a new Trusted Execution State which provides stronger protection and quicker handling of secret data.


Mark Hill

Chief CPU Architect, Huawei Technologies R&D (UK) Ltd
Mark is Chief CPU Architect in the Device Chipset Department of Huawei's Consumer Business Unit. Since 2017 he has been involved in the architecture and design of all Huawei's RISC-V based MCUs covering a wide range of applications. Prior to joining Huawei he spent over 20 years at... Read More →

Thursday September 3, 2020 6:40am - 7:10am PDT