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HarfBuzz text shaping engine http://harfbuzz.github.io/
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harfbuzz/test/fuzzing
Ebrahim Byagowi 64a45be519
[ubsan] Don't decrease pointer if match_glyph_data is null (#2048) 		5 years ago
..
fonts [ubsan] Don't decrease pointer if match_glyph_data is null (#2048) 5 years ago
CMakeLists.txt Remove remains of get-codepoint-fuzzer 6 years ago
Makefile.am [valgrind] Use libtool and support run-subset-fuzzer-tests (#1668) 6 years ago
README Move all references of old url to the new address (#622) 7 years ago
hb-fuzzer.hh [fuzzer] Separate main() into a new file 8 years ago
hb-shape-fuzzer.cc test: Use nullptr in C++ code. (#1744) 6 years ago
hb-subset-fuzzer.cc [fuzz] Don't fail when blob is empty 5 years ago
main.cc [test] minor, fix -Weverything bot 6 years ago
run-shape-fuzzer-tests.py [ci] Use custom subset fuzzer timeout for failing sanitizer bots 5 years ago
run-subset-fuzzer-tests.py [ci] Use custom subset fuzzer timeout for failing sanitizer bots 5 years ago

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