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How My minimal, memory-safe Go rsync steers clear of vulnerabilities

The author details how their Go-based rsync implementation avoids common vulnerabilities found in the original C version (like buffer overflows and symlink races) by leveraging Go's memory safety features. They highlight design choices such as avoiding unsafe code, using bounded types, and minimizing attack surface to achieve a safer file transfer tool without sacrificing compatibility.

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  • The author assesses 12 rsync vulnerabilities against his Go-based gokrazy/rsync. While both he and upstream missed some validation, Go's bounds-checking prevents memory corruption, and the minimal codebase avoids many attack surfaces. He concludes memory-safe languages and minimal implementations significantly reduce security risks.