Rust, known for its stringent safety features, often interoperates with languages with more lenient safety protocols. This study uses MiriLLI, a new tool designed to execute multi-language Rust applications, identifying undefined or undesirable behaviors when Rust interacts with other languages. The analysis uncovered 45 instances of such behaviors across various high-use libraries.

Notable Findings:

• Detected undefined behaviors in libraries affecting popular tools like GCC.
• Identified multiple errors caused by aliasing and type conversion issues.
• Discussed challenges related to maintaining Rust’s security guarantees in mixed-language environments.

Opinion: Highlighting the necessity for robust tools to detect and address issues arising from multi-language code environments, this paper underscores new areas of concern in software development and the need for ongoing vigilance in cross-language compatibility and security.