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Low-power operating system runtimes used on IoT microcontrollers typicallyprovide rudimentary APIs, basic connectivity and, sometimes, a (secure)firmware update mechanism. In contrast, on less constrained hardware, networkedsoftware has entered the age of serverless, microservices and agility. With aview to bridge this gap, in the paper we design Femto-Containers, a newmiddleware runtime which can be embedded on heterogeneous low-power IoTdevices. Femto-Containers enable the secure deployment, execution and isolationof small virtual software functions on low-power IoT devices, over the network.We implement Femto-Containers, and provide integration in RIOT, a popular opensource IoT operating system. We then evaluate the performance of ourimplementation, which was formally verified for fault-isolation, guaranteeingthat RIOT is shielded from logic loaded and executed in a Femto-Container. Ourexperiments on various popular microcontroller architectures (Arm Cortex-M,ESP32 and RISC-V) show that Femto-Containers offer an attractive trade-off interms of memory footprint overhead, energy consumption, and security

Femto-Containers: Lightweight Virtualization and Fault Isolation For Small Software Functions on Low-Power IoT Microcontrollers