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assimp: Add format-specific fuzzers and enable MSan #14775

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assimp: Add format-specific fuzzers and enable MSan #14775

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@skypher skypher commented Jan 10, 2026

Summary

Enhance assimp fuzzing infrastructure with format-specific fuzzers for better coverage.

Changes

  • Add 7 format-specific fuzzers (generic, OBJ, glTF, GLB, FBX, Collada, STL)
  • Add seed corpus from test models for each format
  • Add fuzzing dictionary with format-specific tokens
  • Enable Memory Sanitizer (previously disabled due to Projects with MSAN disabled because of upgrade to Ubuntu 20.04 #6294)
  • Update build script with helper function for building multiple fuzzers
  • Add zip dependency to Dockerfile for corpus creation

Testing

Tested locally:

python infra/helper.py build_image assimp  # PASSED
python infra/helper.py build_fuzzers assimp  # PASSED - all 7 fuzzers built
python infra/helper.py run_fuzzer assimp assimp_fuzzer_stl -- -max_total_time=30  # PASSED

Fuzzers

Fuzzer Target Format Corpus Size
assimp_fuzzer All formats 87MB
assimp_fuzzer_obj OBJ 390KB
assimp_fuzzer_gltf glTF (text) 17MB
assimp_fuzzer_glb GLB (binary) 11MB
assimp_fuzzer_fbx FBX 2MB
assimp_fuzzer_collada Collada 3MB
assimp_fuzzer_stl STL 157KB

Related

@skypher
assimp: Add format-specific fuzzers and enable MSan
7b9174b 
- Add 7 format-specific fuzzers (generic, OBJ, glTF, GLB, FBX, Collada, STL)
- Add seed corpus from test models for each format
- Add fuzzing dictionary with format-specific tokens
- Enable Memory Sanitizer (previously disabled)
- Update build script with helper function for building multiple fuzzers
- Add zip dependency to Dockerfile for corpus creation
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github-actions bot commented Jan 10, 2026

skypher is a new contributor to projects/assimp. The PR must be approved by known contributors before it can be merged. The past contributors are: hunsche, DonggeLiu, inferno-chromium, kimkulling, rchildre3

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skypher commented Jan 10, 2026 •
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@kimkulling Companion PR to assimp/assimp#6429, your approval is needed. Merci

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