mirror of
https://github.com/fluencelabs/wasmer
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39 lines
1.7 KiB
Markdown
39 lines
1.7 KiB
Markdown
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This directory contains the fuzz tests for wasmer. To fuzz, we use the `cargo-fuzz` package.
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## Installation
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You may need to install the `cargo-fuzz` package to get the `cargo fuzz` subcommand. Use
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```sh
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$ cargo install cargo-fuzz
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```
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`cargo-fuzz` is documented in the [Rust Fuzz Book](https://rust-fuzz.github.io/book/cargo-fuzz.html).
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## Running a fuzzer
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Once `cargo-fuzz` is installed, you can run the `simple_instantiate` fuzzer with
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```sh
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cargo fuzz run simple_instantiate
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```
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You should see output that looks something like this:
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```
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INFO: Seed: 3276026494
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INFO: 8 files found in wasmer/fuzz/corpus/simple_instantiate
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INFO: -max_len is not provided; libFuzzer will not generate inputs larger than 4096 bytes
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INFO: seed corpus: files: 8 min: 1b max: 1b total: 8b rss: 133Mb
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#9 INITED ft: 3 corp: 3/3b lim: 4 exec/s: 0 rss: 142Mb
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#23 NEW ft: 4 corp: 4/5b lim: 4 exec/s: 0 rss: 142Mb L: 2/2 MS: 4 ChangeByte-InsertByte-ShuffleBytes-ChangeBit-
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#25 NEW ft: 5 corp: 5/6b lim: 4 exec/s: 0 rss: 142Mb L: 1/2 MS: 2 ChangeBinInt-ChangeBit-
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#27 NEW ft: 6 corp: 6/9b lim: 4 exec/s: 0 rss: 142Mb L: 3/3 MS: 2 InsertByte-ChangeByte-
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#190 REDUCE ft: 6 corp: 6/7b lim: 4 exec/s: 0 rss: 142Mb L: 1/2 MS: 3 ChangeBit-EraseBytes-CrossOver-
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#205 REDUCE ft: 7 corp: 7/11b lim: 4 exec/s: 0 rss: 142Mb L: 4/4 MS: 5 ShuffleBytes-CrossOver-InsertByte-ChangeBinInt-CrossOver-
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```
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It will continue to generate random inputs forever, until it finds a bug or is terminated. The testcases for bugs it finds go into `fuzz/artifacts/simple_instantiate` and you can rerun the fuzzer on a single input by passing it on the command line `cargo fuzz run simple_instantiate my_testcase.wasm`.
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## Trophy case
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- [x] https://github.com/wasmerio/wasmer/issues/558
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