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Marja Hölttä 2d9b9faf17 [iwyu, wasm] Remove unallowed includes to objects-inl.h from wasm. 
R=mstarzinger@chromium.org
BUG=v8:5294

Change-Id: If2cdb4d38829e69ddd8aecb99c99c3a03050f57c
Reviewed-on: https://chromium-review.googlesource.com/441824
Commit-Queue: Marja Hölttä <marja@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43158}
2017-02-13 15:05:37 +00:00
..
json Add json fuzzer 2016-02-02 11:29:01 +00:00
parser Add a library suitable for libfuzzer with a small unit test runner shell 2016-01-26 10:39:03 +00:00
regexp [regexp] add fuzzer support for regexp parser and compiler. 2016-02-01 14:00:38 +00:00
wasm_call [wasm] Add a new fuzzer which can also test wasm function calls. 2016-10-24 11:15:00 +00:00
wasm_code [wasm] Create a new fuzzer for wasm code. 2016-08-29 13:56:00 +00:00
wasm_data_section [wasm] Write fuzzers for single wasm sections. 2016-09-14 11:17:53 +00:00
wasm_function_sigs_section [wasm] Write fuzzers for single wasm sections. 2016-09-14 11:17:53 +00:00
wasm_globals_section [wasm] Write fuzzers for single wasm sections. 2016-09-14 11:17:53 +00:00
wasm_imports_section [wasm] Write fuzzers for single wasm sections. 2016-09-14 11:17:53 +00:00
wasm_memory_section [wasm] Write fuzzers for single wasm sections. 2016-09-14 11:17:53 +00:00
wasm_names_section [wasm] Write fuzzers for single wasm sections. 2016-09-14 11:17:53 +00:00
wasm_types_section [wasm] Write fuzzers for single wasm sections. 2016-09-14 11:17:53 +00:00
DEPS Add a library suitable for libfuzzer with a small unit test runner shell 2016-01-26 10:39:03 +00:00
fuzzer-support.cc Provide a convenience array buffer allocator 2016-06-29 07:42:40 +00:00
fuzzer-support.h Provide a convenience array buffer allocator 2016-06-29 07:42:40 +00:00
fuzzer.cc [wasm] Fix -Wsign-compare warnings. 2016-11-10 12:51:05 +00:00
fuzzer.gyp Add icu libraries to fuzzer dependencies 2016-11-18 11:14:30 +00:00
fuzzer.isolate [wasm] Add a new fuzzer which can also test wasm function calls. 2016-10-24 11:15:00 +00:00
fuzzer.status Add a library suitable for libfuzzer with a small unit test runner shell 2016-01-26 10:39:03 +00:00
json.cc Add GC request to libFuzzers in attempt to avoid parasitic coverage. 2016-04-28 13:32:28 +00:00
parser.cc Reland of land: [Parse] ParseInfo owns the parsing Zone. (patchset #1 id:1 of https://codereview.chromium.org/2683733002/ ) 2017-02-07 20:46:47 +00:00
README.md [fuzzer] Format README.md 2017-02-13 08:42:26 +00:00
regexp.cc [regexp fuzzer] Let the fuzzer input select the regexp flag. 2016-11-22 12:59:38 +00:00
testcfg.py [wasm] Add a new fuzzer which can also test wasm function calls. 2016-10-24 11:15:00 +00:00
wasm_asmjs.tar.gz.sha1 [wasm] Write fuzzers for single wasm sections. 2016-09-14 11:17:53 +00:00
wasm-asmjs.cc [wasm] Change the constant kV8MaxWasmTableSize to a command line flag. 2017-01-24 10:12:22 +00:00
wasm-call.cc [iwyu, wasm] Remove unallowed includes to objects-inl.h from wasm. 2017-02-13 15:05:37 +00:00
wasm-code.cc [iwyu, wasm] Remove unallowed includes to objects-inl.h from wasm. 2017-02-13 15:05:37 +00:00
wasm-data-section.cc [iwyu, wasm] Remove unallowed includes to objects-inl.h from wasm. 2017-02-13 15:05:37 +00:00
wasm-function-sigs-section.cc [iwyu, wasm] Remove unallowed includes to objects-inl.h from wasm. 2017-02-13 15:05:37 +00:00
wasm-globals-section.cc [iwyu, wasm] Remove unallowed includes to objects-inl.h from wasm. 2017-02-13 15:05:37 +00:00
wasm-imports-section.cc [iwyu, wasm] Remove unallowed includes to objects-inl.h from wasm. 2017-02-13 15:05:37 +00:00
wasm-memory-section.cc [iwyu, wasm] Remove unallowed includes to objects-inl.h from wasm. 2017-02-13 15:05:37 +00:00
wasm-names-section.cc [iwyu, wasm] Remove unallowed includes to objects-inl.h from wasm. 2017-02-13 15:05:37 +00:00
wasm-section-fuzzers.cc [iwyu, wasm] Remove unallowed includes to objects-inl.h from wasm. 2017-02-13 15:05:37 +00:00
wasm-section-fuzzers.h [wasm] Master CL for Binary 0xC changes. 2016-09-27 20:46:30 +00:00
wasm-types-section.cc [iwyu, wasm] Remove unallowed includes to objects-inl.h from wasm. 2017-02-13 15:05:37 +00:00
wasm.cc [wasm] Change the constant kV8MaxWasmTableSize to a command line flag. 2017-01-24 10:12:22 +00:00
wasm.tar.gz.sha1 [wasm] Write fuzzers for single wasm sections. 2016-09-14 11:17:53 +00:00

README.md

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. 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/, 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/ 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, e.g. the build rules for the 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, e.g. 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/x64.debug/v8_simple_foo_fuzzer testcase.foo

  5. Copy the build rules of an existing fuzzer in test/fuzzer/fuzzer.gyp, e.g. the build rules for the 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

  7. Add the fuzzer to the FuzzerTestSuite in 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, e.g. the build rule for the wasm.cc fuzzer is v8_wasm_fuzzer. There is no need to set a dictionary , or a seed_corpus. See chromium-fuzzing-getting-started 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

    • mkdir /tmp/empty_corpus && out/libfuzzer/v8_foo_fuzzer /tmp/empty_corpus