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Some fuzzing improvements #12962

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4b81201
Add dedicated fuzzing target for component_async
tschneidereit Apr 4, 2026
802f2b9
Improve the misc fuzz target
tschneidereit Apr 4, 2026
bf5f3cf
Add a fuzzer dictionary for wasm bytecode
tschneidereit Apr 4, 2026
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18 changes: 0 additions & 18 deletions crates/fuzzing/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -34,24 +34,6 @@ pub fn init_fuzzing() {
});
}

/// One time start up initialization for fuzzing:
///
/// * Enables `env_logger`.
///
/// * Restricts `rayon` to a single thread in its thread pool, for more
/// deterministic executions.
///
/// If a fuzz target is taking raw input bytes from the fuzzer, it is fine to
/// call this function in the fuzz target's oracle or in the fuzz target
/// itself. However, if the fuzz target takes an `Arbitrary` type, and the
/// `Arbitrary` implementation is not derived and does interesting things, then
/// the `Arbitrary` implementation should call this function, since it runs
/// before the fuzz target itself.
pub fn misc_init() {
init_fuzzing();
oracles::component_async::init();
}

fn block_on<F: Future>(future: F) -> F::Output {
const MAX_POLLS: u32 = 100_000;

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7 changes: 7 additions & 0 deletions fuzz/Cargo.toml
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Expand Up @@ -125,3 +125,10 @@ path = "fuzz_targets/gc_ops.rs"
test = false
doc = false
bench = false

[[bin]]
name = "component_async"
path = "fuzz_targets/component_async.rs"
test = false
doc = false
bench = false
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