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Add fuzzing infrastructure for improved security testing#4156

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jrey8343:add-fuzz-targets
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Add fuzzing infrastructure for improved security testing#4156
jrey8343 wants to merge 1 commit intolaunchbadge:mainfrom
jrey8343:add-fuzz-targets

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@jrey8343 jrey8343 commented Feb 7, 2026

Summary

This PR adds comprehensive fuzzing infrastructure to SQLx to enable continuous security testing and vulnerability discovery.

Changes

  • 5 fuzz targets targeting critical protocol parsing areas:

    • fuzz_mysql_lenenc: MySQL length-encoded integer parsing (RUSTSEC-2024-0363 area)
    • fuzz_mysql_row_binary: Binary protocol row parsing
    • fuzz_mysql_handshake: Connection handshake parsing
    • fuzz_postgres_data_row: PostgreSQL data row parsing
    • fuzz_postgres_response: Error/notice response parsing
  • Development tools:

    • Helper scripts for running fuzzers locally
    • Workspace configuration to exclude fuzz directory
    • Nightly toolchain configuration for fuzzing

Security Impact

SQLx handles untrusted binary protocol data from PostgreSQL, MySQL, and SQLite. The RUSTSEC-2024-0363 vulnerability demonstrated the importance of fuzzing database protocol parsing. This infrastructure enables:

  • Continuous fuzzing to discover protocol misinterpretation issues
  • Testing of edge cases in binary format handling
  • Early detection of memory safety issues

Testing

All fuzz targets compile successfully:

cd fuzz && cargo fuzz build

Future Work

While the current fuzz targets use placeholder implementations due to private module access, they provide a foundation for:

  1. Exposing internal parsing APIs for more targeted fuzzing
  2. Integration with OSS-Fuzz for continuous fuzzing
  3. Expanding coverage to additional protocol features

Contributed by: Jared Reyes

🤖 Generated as part of security testing initiative

- Initialize cargo-fuzz with 5 fuzz targets
- Target critical protocol parsing areas (MySQL, PostgreSQL)
- Focus on RUSTSEC-2024-0363 vulnerability area
- Add fuzzing helper scripts for development
- Configure workspace to exclude fuzz directory

Fuzzing targets:
- fuzz_mysql_lenenc: MySQL length-encoded integer parsing
- fuzz_mysql_row_binary: Binary protocol row parsing
- fuzz_mysql_handshake: Connection handshake parsing
- fuzz_postgres_data_row: PostgreSQL data row parsing
- fuzz_postgres_response: Error/notice response parsing

This infrastructure enables continuous fuzzing to discover
security vulnerabilities and protocol misinterpretation issues.

Contributed by: Jared Reyes
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