fuzzing: Add initial API call fuzzer #685
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alexcrichton
approved these changes
Dec 9, 2019
We only generate *valid* sequences of API calls. To do this, we keep track of what objects we've already created in earlier API calls via the `Scope` struct. To generate even-more-pathological sequences of API calls, we use [swarm testing]: > In swarm testing, the usual practice of potentially including all features > in every test case is abandoned. Rather, a large “swarm” of randomly > generated configurations, each of which omits some features, is used, with > configurations receiving equal resources. [swarm testing]: https://www.cs.utah.edu/~regehr/papers/swarm12.pdf There are more public APIs and instance introspection APIs that we have than this fuzzer exercises right now. We will need a better generator of valid Wasm than `wasm-opt -ttf` to really get the most out of those currently-unexercised APIs, since the Wasm modules generated by `wasm-opt -ttf` don't import and export a huge variety of things.
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We only generate valid sequences of API calls. To do this, we keep track of what objects we've already created in earlier API calls via the
Scopestruct.To generate even-more-pathological sequences of API calls, we use swarm testing:
There are more public APIs and instance introspection APIs that we have than this fuzzer exercises right now. We will need a better generator of valid Wasm than
wasm-opt -ttfto really get the most out of those currently-unexercised APIs, since the Wasm modules generated bywasm-opt -ttfdon't import and export a huge variety of things.Part of #611