harfbuzz/test/fuzzing
Ebrahim Byagowi bccd09d6c7 Minor, tweak spaces on hb-shape-fuzzer.cc 2018-10-19 09:39:36 +03:30
..
fonts [fuzz] Add more found cases (#1275) 2018-10-19 08:09:53 +03:30
CMakeLists.txt Remove remains of get-codepoint-fuzzer 2018-10-11 17:31:29 -04:00
Makefile.am Add all the fonts found by fuzzers to the repo (#1258) 2018-10-17 01:42:04 +03:30
README Move all references of old url to the new address (#622) 2017-11-20 14:49:22 -05:00
hb-fuzzer.hh [fuzzer] Separate main() into a new file 2016-12-20 20:50:38 -06:00
hb-shape-fuzzer.cc Minor, tweak spaces on hb-shape-fuzzer.cc 2018-10-19 09:39:36 +03:30
hb-subset-fuzzer.cc [fuzzing] Fold get-codepoints-fuzzer into subset-fuzzer 2018-10-11 17:08:12 -04:00
main.cc Minor 2018-10-11 15:42:54 -04:00
run-shape-fuzzer-tests.py [test/shape-fuzzer] fail on timeout and ubsan errors (#1267) 2018-10-18 07:42:20 +03:30
run-subset-fuzzer-tests.py [fuzzing] Run tests against fuzzing fonts 2018-10-16 16:39:55 -07:00

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