The integration of Rust into the baseband firmware of Pixel 10 series phones is a significant step towards enhancing security by leveraging memory-safe languages. Here's an overview and key points from the project:
Overview
-
Objective: Integrate Rust (a memory-safe language) into the modem firmware to replace existing C/C++ code, reducing attack surfaces.
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Implementation:
- Replaced a DNS response parsing function with Rust.
- Ensured seamless integration between Rust and existing C/C++ components.
Key Steps
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Building Core Components:
- Built
core,alloc, andcompiler_builtinsdirectly from source, ensuring compatibility with the modem's memory management system.
- Built
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Memory Management:
- Implemented a custom allocator for Rust’s
alloccrate to integrate with existing firmware allocators.
- Implemented a custom allocator for Rust’s
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Panic Handling:
- Unified crash handling by integrating Rust panic handlers with the existing C/C++ crash facade via FFI (Foreign Function Interface).
-
Linking and Integration:
- Extracted object files from the Rust static library using
llvm-arand linked them into the final firmware image. - Addressed performance issues
- Extracted object files from the Rust static library using
Read the full article at Google Online Security Blog
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