| Index: test/fuzzer/README.md
|
| diff --git a/test/fuzzer/README.md b/test/fuzzer/README.md
|
| index 4c1580a6ea2cd60497750ff52e7d74318672f59f..7b2955c5a5c6c04a0eed3142c4aa8e8c43bd6706 100644
|
| --- a/test/fuzzer/README.md
|
| +++ b/test/fuzzer/README.md
|
| @@ -1,90 +1,34 @@
|
| # How to make a libFuzzer fuzzer in V8
|
|
|
| -This document describes how to make a new libFuzzer fuzzer for V8. A general
|
| -introduction to libFuzzer can be found
|
| -[here](https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/README.md).
|
| -In short, libFuzzer is an in-process coverage-driven evolutionary fuzzer.
|
| -libFuzzer serves you with a sequence of byte arrays that you can use to test
|
| -your code. libFuzzer tries to generate this sequence of byte arrays in a way
|
| -that maximizes test coverage.
|
| +This document describes how to make a new libfuzzer fuzzer for V8. A general introduction to libfuzzer can be found at [here](https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/README.md). In short, libFuzzer is an in-process coverage-driven evolutionary fuzzer. libFuzzer serves you with a sequence of byte arrays that you can use to test your code. libFuzzer tries to generate this sequence of byte arrays in a way that maximizes test coverage.
|
|
|
| **Warning**: By itself libFuzzer typically does not generate valid JavaScript code.
|
|
|
| ## Changes to V8
|
|
|
| -**tldr:** Do the same as https://codereview.chromium.org/2280623002 to introduce
|
| -a new fuzzer to V8.
|
| -
|
| -This is a step by step guide on how to make a new fuzzer in V8. In the example
|
| -the fuzzer is called `foo`.
|
| -
|
| -1. Copy one of the existing fuzzer implementations in
|
| - [test/fuzzer/](https://cs.chromium.org/chromium/src/v8/test/fuzzer/), e.g. `cp wasm.cc foo.cc`
|
| -
|
| - * Copying an existing fuzzer is a good idea to get all the required setup,
|
| - e.g. setting up the isolate
|
| -
|
| -2. Create a directory called `foo` in
|
| - [test/fuzzer/](https://cs.chromium.org/chromium/src/v8/test/fuzzer/) which
|
| - contains at least one file
|
| -
|
| - * The file is used by the trybots to check whether the fuzzer actually
|
| - compiles and runs
|
| -
|
| -3. Copy the build rules of an existing fuzzer in
|
| - [BUILD.gn](https://cs.chromium.org/chromium/src/v8/BUILD.gn), e.g. the build
|
| - rules for the
|
| - [wasm.cc](https://cs.chromium.org/chromium/src/v8/test/fuzzer/wasm.cc) fuzzer
|
| - are `v8_source_set("wasm_fuzzer")` and `v8_fuzzer("wasm_fuzzer")`. Note that
|
| - the name has to be the name of the directory created in Step 2 + `_fuzzer` so
|
| - that the scripts on the trybots work
|
| -
|
| -4. Now you can already compile the fuzzer with `ninja -j 1000 -C out/x64.debug/v8_simple_foo_fuzzer`
|
| -
|
| - * Use this binary to reproduce issues found by cluster fuzz, e.g.
|
| - `out/tmp/v8_simple_foo_fuzzer testcase.foo`
|
| -
|
| -5. Copy the build rules of an existing fuzzer in
|
| - [test/fuzzer/fuzzer.gyp](https://cs.chromium.org/chromium/src/v8/test/fuzzer/fuzzer.gyp),
|
| - e.g. the build rules for the
|
| - [wasm.cc](https://cs.chromium.org/chromium/src/v8/test/fuzzer/wasm.cc) fuzzer
|
| - are `v8_simple_wasm_fuzzer` and `wasm_fuzzer_lib`
|
| -
|
| +**tldr:** Do the same as https://codereview.chromium.org/2280623002 to introduce a new fuzzer to V8.
|
| +This is a step by step guide on how to make a new fuzzer in V8. In the example the fuzzer is called `foo`.
|
| +1) Copy one of the existing fuzzer implementations in [test/fuzzer/](https://cs.chromium.org/chromium/src/v8/test/fuzzer/), e.g. `cp wasm.cc foo.cc`
|
| + * Copying an existing fuzzer is a good idea to get all the required setup, e.g. setting up the isolate
|
| +2) Create a directory called `foo` in [test/fuzzer/](https://cs.chromium.org/chromium/src/v8/test/fuzzer/) which contains at least one file
|
| + * The file is used by the trybots to check whether the fuzzer actually compiles and runs
|
| +3) Copy the build rules of an existing fuzzer in [BUILD.gn](https://cs.chromium.org/chromium/src/v8/BUILD.gn), e.g. the build rules for the [wasm.cc](https://cs.chromium.org/chromium/src/v8/test/fuzzer/wasm.cc) fuzzer are `v8_source_set("wasm_fuzzer")` and `v8_fuzzer("wasm_fuzzer")`. Note that the name has to be the name of the
|
| +directory created in Step 2 + “_fuzzer” so that the scripts on the trybots work
|
| +4) Now you can already compile the fuzzer with `ninja -j 1000 -C out/tmp/v8_simple_foo_fuzzer`
|
| + * Use this binary to reproduce issues found by cluster fuzz, e.g. `out/tmp/v8_simple_foo_fuzzer testcase.foo`
|
| +5) Copy the build rules of an existing fuzzer in [test/fuzzer/fuzzer.gyp](https://cs.chromium.org/chromium/src/v8/test/fuzzer/fuzzer.gyp), e.g. the build rules for the [wasm.cc](https://cs.chromium.org/chromium/src/v8/test/fuzzer/wasm.cc) fuzzer are `v8_simple_wasm_fuzzer` and `wasm_fuzzer_lib`
|
| * This build rule is needed to compile with gyp
|
| -
|
| -6. Copy the binary name and the test directory name in
|
| - [test/fuzzer/fuzzer.isolate](https://cs.chromium.org/chromium/src/v8/test/fuzzer/fuzzer.isolate)
|
| -
|
| -7. Add the fuzzer to the FuzzerTestSuite in
|
| - [test/fuzzer/testcfg.py](https://cs.chromium.org/chromium/src/v8/test/fuzzer/testcfg.py)
|
| -
|
| - * This step is needed to run the fuzzer with the files created in Step 2 on
|
| - the trybots
|
| -
|
| -8. Commit the changes described above to the V8 repository
|
| +6) Copy the binary name and the test directory name in [test/fuzzer/fuzzer.isolate](https://cs.chromium.org/chromium/src/v8/test/fuzzer/fuzzer.isolate)
|
| +7) Add the fuzzer to the FuzzerTestSuite in [test/fuzzer/testcfg.py](https://cs.chromium.org/chromium/src/v8/test/fuzzer/testcfg.py)
|
| + * This step is needed to run the fuzzer with the files created in Step 2 on the trybots
|
| +8) Commit the changes described above to the V8 repository
|
|
|
| ## Changes to Chromium
|
| -
|
| -**tldr:** Do the same as https://codereview.chromium.org/2344823002 to add the
|
| -new fuzzer to cluster fuzz.
|
| -
|
| -1. Copy the build rules of an existing fuzzer in
|
| - [testing/libfuzzer/fuzzers/BUILD.gn](https://cs.chromium.org/chromium/src/testing/libfuzzer/fuzzers/BUILD.gn),
|
| - e.g. the build rule for the
|
| - [wasm.cc](https://cs.chromium.org/chromium/src/v8/test/fuzzer/wasm.cc) fuzzer
|
| - is `v8_wasm_fuzzer`. There is no need to set a `dictionary` , or a `seed_corpus`.
|
| - See
|
| - [chromium-fuzzing-getting-started](https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/getting_started.md)
|
| - for more information.
|
| -
|
| -2. Compile the fuzzer in chromium (for different configurations see:
|
| - https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/reproducing.md):
|
| -
|
| +**tldr:** Do the same as https://codereview.chromium.org/2344823002 to add the new fuzzer to cluster fuzz.
|
| +1) Copy the build rules of an existing fuzzer in [testing/libfuzzer/fuzzers/BUILD.gn](https://cs.chromium.org/chromium/src/testing/libfuzzer/fuzzers/BUILD.gn), e.g. the build rule for the [wasm.cc](https://cs.chromium.org/chromium/src/v8/test/fuzzer/wasm.cc) fuzzer is {v8_wasm_fuzzer}. There is no need to set a dictionary , or a seed_corpus. See [chromium-fuzzing-getting-started](https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/getting_started.md) for more information.
|
| +2) Compile the fuzzer in chromium (for different configurations see: https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/reproducing.md):
|
| * `gn gen out/libfuzzer '--args=use_libfuzzer=true is_asan=true is_debug=false enable_nacl=false'`
|
| -
|
| * `ninja -j 1000 -C out/libfuzzer/ v8_foo_fuzzer`
|
| -
|
| -3. Run the fuzzer locally
|
| -
|
| +3) Run the fuzzer locally
|
| * `mkdir /tmp/empty_corpus && out/libfuzzer/v8_foo_fuzzer /tmp/empty_corpus`
|
|
|
|
|