Fuzzing test

Do fuzzing test for TinyGLTF API.

Supported API

• [x] LoadASCIIFromString
• [ ] LoadBinaryFromMemory

Custom JSON backend (tinygltf_json.h)

• [x] LoadASCIIFromString
• [x] LoadBinaryFromMemory

Requirements

• meson
• clang with fuzzer support(-fsanitize=fuzzer. at least clang 8.0 should work)

Setup

Ubuntu 18.04

$ sudo apt install clang++-8
$ sudo apt install libfuzzer-8-dev

Optionally, if you didn't set update-alternatives you can set clang++ to point to clang++8

$ sudo update-alternatives --install /usr/bin/clang clang /usr/bin/clang-8 10
$ sudo update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-8 10

How to compile

$ CXX=clang++ CC=clang meson build
$ cd build
$ ninja

This builds two fuzzers:

• fuzz_gltf – default nlohmann/json backend
• fuzz_gltf_customjson – custom tinygltf_json.h backend (tests both ASCII and binary parsing paths)

How to run

Increase memory limit. e.g. -rss_limit_mb=50000

$ ./fuzz_gltf -rss_limit_mb=20000 -jobs 4
$ ./fuzz_gltf_customjson -rss_limit_mb=20000 -jobs 4