SAE JA1020_202603

This document provides guidance to using Rust in critical and safety-related software. The document summarizes how the usage of Rust supports in arguing safety according to ISO 26262 or RTCA DO-178C combined with RTCA DO-332. Cybersecurity best practices are referenced as these requirements largely overlap with those implemented for safety. As the Rust language is still evolving, this document targets the 2021 and 2024 editions of the language. Older or newer editions might require additional or changed rules and guidelines. Generally, the newest available edition of the language should be selected as newer editions remove ambiguities and outdated parts from the language. This document discusses guidance on using the Rust programming language in critical systems. Rust is a general purpose programming language which combines high run time efficiency and modern design patterns with an ecosystem for rigorous compile time checking. While this language is well suited for critical systems, the current lack of common coding guidelines and best practices is considered an impediment to its use in this domain. This recommended practice exists to complement the existing cybersecurity guideline.