| In order to build the fuzzer one needs to build HarfBuzz and |
| harfbuzz/test/fuzzing/hb-fuzzer.cc with: |
| - Using the most recent Clang |
| - With -fsanitize=address (or =undefined, or a combination) |
| - With -fsanitize-coverage=edge[,8bit-counters,trace-cmp] |
| - With various defines that limit worst case exponential behavior. |
| See FUZZING_CPPFLAGS in harfbuzz/src/Makefile.am for the list. |
| - link against libFuzzer |
| |
| To run the fuzzer one needs to first obtain a test corpus as a directory |
| containing interesting fonts. A good starting point is inside |
| harfbuzz/test/shaping/fonts/fonts/. |
| Then, run the fuzzer like this: |
| ./hb-fuzzer -max_len=2048 CORPUS_DIR |
| Where max_len specifies the maximal length of font files to handle. |
| The smaller the faster. |
| |
| For more details consult the following locations: |
| - http://llvm.org/docs/LibFuzzer.html or |
| - https://github.com/google/libfuzzer-bot/tree/master/harfbuzz |
| - https://github.com/harfbuzz/harfbuzz/issues/139 |
