How to make a libFuzzer fuzzer in V8

[u areu]

Hi, I'm following https://source.chromium.org/chromium/chromium/src/+/main:v8/test/fuzzer/

try to build wasm_code fuzzer. 

I can run 

`

ninja -C out/fuzz wasm_code_fuzzer

`

but only generated wasm-code.o, no executable binary. 

Is there any missing? Even I add `use_libfuzzer=true` to args.gn.

[Matthias Liedtke]

Hi,

Assuming that you use the v8 repository (not chromium, targets might be slightly different there):
You should be able to build it with autoninja -C out/fuzz v8_simple_wasm_code_fuzzer

Best regards,

Matthias

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Matthias Liedtke

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[Clemens Backes]

Note though that the "simple" fuzzers you can compile in V8 do not have libfuzzer support. They can only run already-generated inputs.

Libfuzzer is only supported in a chromium checkout. You can build the v8 fuzzers like "v8_wasm_code_fuzzer" or "v8_wasm_compile_fuzzer" there.

To view this discussion on the web visit https://groups.google.com/d/msgid/v8-dev/CACx9iAN2tPHm%2B-OgxLDp0_mpuVy2FpmvmCxj%3DU-8o%3DPLfhi28w%40mail.gmail.com.

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Clemens Backes

Software Engineer

clem...@google.com

Google Germany GmbH

Erika-Mann-Straße 33

80636 München

Geschäftsführer: Paul Manicle, Liana Sebastian   

Registergericht und -nummer: Hamburg, HRB 86891

Sitz der Gesellschaft: Hamburg

Diese E-Mail ist vertraulich. Falls sie diese fälschlicherweise erhalten haben sollten, leiten Sie diese bitte nicht an jemand anderes weiter, löschen Sie alle Kopien und Anhänge davon und lassen Sie mich bitte wissen, dass die E-Mail an die falsche Person gesendet wurde.

[u areu]

thanks

[u areu]

I can build v8_simple_wasm_code_fuzzer , but it seems v8_simple_wasm_code_fuzzer can't work like libfuzzer. Ok, libfuzzer no supported in v8 repo. 

I will build v8 fuzzer in chromium. 

Thanks.