22 lines
967 B
Plaintext
22 lines
967 B
Plaintext
|
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
|