8bb8070116
- Adds initial fuzz_target for image decoders. - Adds jazzer.js as dev-dependency. - Adds a .eslintrc rule to ignore import/no-unresolved error.
1.5 KiB
Fuzz Testing
Fuzz testing is:
An automated software testing technique that involves providing invalid, unexpected, or random data as inputs to a program.
We use coverage guided fuzz testing to automatically discover bugs in PDF.js.
This fuzz/ directory contains the configuration and the fuzz tests for PDF.js.
To generate and run fuzz tests, we use the Jazzer.js library.
Running a fuzzer
This directory contains fuzzers like for example jpeg_image.fuzz. You can run it with:
Generate image decoders:
$ gulp image_decoders
Run fuzz target:
$ npx jazzer fuzz/jpeg_image.fuzz --sync
You should see output that looks something like this:
#2 INITED exec/s: 0 rss: 128Mb
#65536 pulse corp: 1/1b lim: 652 exec/s: 32768 rss: 140Mb
#131072 pulse corp: 1/1b lim: 1300 exec/s: 32768 rss: 140Mb
#262144 pulse corp: 1/1b lim: 2611 exec/s: 32768 rss: 140Mb
#524288 pulse corp: 1/1b lim: 4096 exec/s: 30840 rss: 140Mb
#1048576 pulse corp: 1/1b lim: 4096 exec/s: 29959 rss: 140Mb
#2097152 pulse corp: 1/1b lim: 4096 exec/s: 29537 rss: 140Mb
It will continue to generate random inputs forever, until it finds a
bug or is terminated. The testcases for bugs it finds can be seen in
the form of crash-* or timeout-* at the place from where command is run.
You can rerun the fuzzer on a single input by passing it on the
command line npx jazzer fuzz/jpeg_image.fuzz /path/to/testcase.