4376cf2609
* Add differential fuzzing against V8 This commit adds a differential fuzzing target to Wasmtime along the lines of the wasmi and spec interpreters we already have, but with V8 instead. The intention here is that wasmi is unlikely to receive updates over time (e.g. for SIMD), and the spec interpreter is not suitable for fuzzing against in general due to its performance characteristics. The hope is that V8 is indeed appropriate to fuzz against because it's naturally receiving updates and it also is expected to have good performance. Here the `rusty_v8` crate is used which provides bindings to V8 as well as precompiled binaries by default. This matches exactly the use case we need and at least for now I think the `rusty_v8` crate will be maintained by the Deno folks as they continue to develop it. If it becomes an issue though maintaining we can evaluate other options to have differential fuzzing against. For now this commit enables the SIMD and bulk-memory feature of fuzz-target-generation which should enable them to get differentially-fuzzed with V8 in addition to the compilation fuzzing we're already getting. * Use weak linkage for GDB jit helpers This should help us deduplicate our symbol with other JIT runtimes, if any. For now this leans on some C helpers to define the weak linkage since Rust doesn't support that on stable yet. * Don't use rusty_v8 on MinGW They don't have precompiled libraries there. * Fix msvc build * Comment about execution
14 lines
379 B
Rust
14 lines
379 B
Rust
#![no_main]
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use libfuzzer_sys::fuzz_target;
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use wasmtime_fuzzing::{generators, oracles};
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fuzz_target!(|data: (
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generators::Config,
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wasm_smith::ConfiguredModule<oracles::SingleFunctionModuleConfig<true, true>>
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)| {
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let (config, mut wasm) = data;
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wasm.module.ensure_termination(1000);
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oracles::differential_v8_execution(&wasm.module.to_bytes(), &config);
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});
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