openjpeg/tests/fuzzers

This directory contain fuzzer main functions and scripts for the
Google OSS Fuzz project: https://github.com/google/oss-fuzz/

The main build scripts are in:
https://github.com/google/oss-fuzz/tree/master/projects/openjpeg
and call scripts in this directory.

The list of issues is in:
https://bugs.chromium.org/p/oss-fuzz/issues/list?q=openjpeg


- Simulate the build of (dummy) fuzzers like OSS Fuzz does:

Preliminary steps:
$ cd ${ROOT_OF_OPENJPEG}
$ git clone --depth 1 https://github.com/uclouvain/openjpeg-data data
$ mkdir build
$ cd build
$ cmake ..
$ make
$ cd ..

Actual building of fuzzer and seed corpus:
$ cd tests/fuzzers
$ make

They are created in /tmp/*_fuzzer as well as with the
/tmp/*_fuzzer_seed_corpus.zip files

Run one:
$ /tmp/opj_decompress_fuzzer a_file_name

- Run locally OSS Fuzz:
$ git clone https://github.com/google/oss-fuzz.git
$ cd oss-fuzz
$ python infra/helper.py build_image openjpeg

Build fuzzers with the address sanitizer (could use undefined, etc...)
$ python infra/helper.py build_fuzzers --sanitizer address openjpeg

Test a particular fuzzer (replace opj_decompress_fuzzer by other fuzzers
like the ones generated in /tmp by "make dummyfuzzers")
$ python infra/helper.py run_fuzzer openjpeg opj_decompress_fuzzer


How to deal with issues reported in https://bugs.chromium.org/p/oss-fuzz/issues/list?q=openjpeg ?

1. Leave a comment in (chromium database) bug entry to indicate that you work on it
2. Work
3. Commit a bug fix with log including "Credit to OSS-Fuzz" and a link to the bugs.chromium.org ticket
4. Add in the bugs.chromium.org ticket a link to the github commit implementing the fix.
5. Check chromium closed the bug (after one or two days typically)