kc3-lang/harfbuzz/test/fuzzing/README

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  Date : 2017-11-20T14:49:22
  

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• test/fuzzing/README

• 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
  

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