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Benedikt Meurer 824ae14c7a [debug] Cleanup properly when microtask execution is terminated. 
When a terminate_exception is raised while executing one of the promise
related jobs on the microtask queue, we don't clean up properly, leaving
the async stack in the inspector in an inconsistent state, not cleaning
up the promise stack on the Isolate, and also not resetting the global
current_microtask slot. This CL adds appropriate logic to perform the
correct cleanup.

Fixed: chromium:1297964
Change-Id: I4ec64405d4c66bfe1f0115e7039866447fb10f02
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3471815
Auto-Submit: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79162}
2022-02-18 08:49:05 +00:00
..
inspector [debug] Cleanup properly when microtask execution is terminated. 2022-02-18 08:49:05 +00:00
json
multi_return [turbofan] Add fuzzer to test different signatures for multi-returns 2018-01-12 12:20:27 +00:00
parser
regexp
regexp_builtins [regexp] Initial go at a builtins fuzzer 2018-01-18 11:02:57 +00:00
wasm [wasm] Install the exception constructor in InstallConditionalFeatures 2021-03-25 16:28:53 +00:00
wasm_async [wasm][fuzzer] Fix return value of interpreter 2020-08-13 10:08:53 +00:00
wasm_code
wasm_compile
BUILD.gn [no-wasm] Exclude more targets from build 2021-03-09 11:25:54 +00:00
DEPS
fuzzer-support.cc V8 Sandbox rebranding 2021-12-15 17:09:36 +00:00
fuzzer-support.h Reland "[include] Split out v8.h" 2021-08-24 13:08:55 +00:00
fuzzer.cc [test/fuzzer] Fix cpplint complaints 2017-09-04 10:45:21 +00:00
fuzzer.status [debug] Cleanup properly when microtask execution is terminated. 2022-02-18 08:49:05 +00:00
inspector-fuzzer.cc Fix name collision of v8::internal::IsolateData 2021-08-25 08:45:53 +00:00
json.cc Reland "[include] Split out v8.h" 2021-08-24 13:08:55 +00:00
multi-return.cc [isolate][cleanup] Remove pointer to WasmEngine 2021-06-21 09:09:25 +00:00
parser.cc [compiler] Introduce ReusableUnoptimizedCompileState 2021-12-08 11:14:27 +00:00
README.md [gyp] move build targets for tests to gypfiles. 2018-01-30 06:31:00 +00:00
regexp-builtins.cc Reland "[include] Split out v8.h" 2021-08-24 13:08:55 +00:00
regexp.cc [cleanup] Fix -Wshadow warnings in test/fuzzer/regexp 2021-09-27 15:59:54 +00:00
testcfg.py [inspector][fuzzer] Add inspector fuzzer 2020-11-02 14:29:08 +00:00
wasm_corpus.tar.gz.sha1 [wasm] Update fuzzer corpus 2022-01-12 16:47:30 +00:00
wasm-async.cc Reland "[include] Split out v8.h" 2021-08-24 13:08:55 +00:00
wasm-code.cc [fuzzer] Add struct type and array type to fuzzed module 2021-07-19 10:59:15 +00:00
wasm-compile.cc [wasm][fuzzer] Emit the correct function index 2022-02-14 17:47:17 +00:00
wasm-fuzzer-common.cc [wasm][fuzzer] Dump data segments when generating tests 2022-02-15 15:38:58 +00:00
wasm-fuzzer-common.h [fuzzer] Add struct type and array type to fuzzed module 2021-07-19 10:59:15 +00:00
wasm.cc Reland "[include] Split out v8.h" 2021-08-24 13:08:55 +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 binary name and the test directory name in test/fuzzer/fuzzer.isolate

  6. 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

  7. 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/reference.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