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docs: update fuzzers docs

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Frantisek Sumsal 2023-10-14 17:47:10 +02:00
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docs/HACKING.md
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@ -147,8 +147,27 @@ corpus should be built and exported as `$OUT/fuzz-foo_seed_corpus.zip` in
`tools/oss-fuzz.sh`.
The fuzzers can be built locally if you have libFuzzer installed by running
`tools/oss-fuzz.sh`. You should also confirm that the fuzzers can be built and
run using
`tools/oss-fuzz.sh`, or by running:
```
CC=clang CXX=clang++ \
meson setup build-libfuzz -Dllvm-fuzz=true -Db_sanitize=address,undefined -Db_lundef=false \
-Dc_args='-fno-omit-frame-pointer -DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION'
ninja -C build-libfuzz fuzzers
```
Each fuzzer then can be then run manually together with a directory containing
the initial corpus:
```
export UBSAN_OPTIONS=print_stacktrace=1:print_summary=1:halt_on_error=1
build-libfuzz/fuzz-varlink-idl test/fuzz/fuzz-varlink-idl/
```
Note: the `halt_on_error=1` UBSan option is especially important, otherwise
the fuzzer won't crash when undefined behavior is triggered.
You should also confirm that the fuzzers can be built and run using
[the OSS-Fuzz toolchain](https://google.github.io/oss-fuzz/advanced-topics/reproducing/#building-using-docker):
```