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Hash : 067f90a8
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Date : 2021-12-14T16:24:38
[subset] Fix for fuzzer timeout. Fixes https://oss-fuzz.com/testcase-detail/5549945449480192 In prune_langsys: move LangSys visited check up before any work is done for a LangSys. In this particular case the compare() method is responsible for the majority of the time spent and wasn't being guarded with a visisted check.
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README
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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