Jfuzz fuzz target script for WebAssembly parsing library

fuzz-wasm-parser.js

const parser = require("@webassemblyjs/wasm-parser");

function fuzz(buf) {
    try {
        parser.decode(buf, {});
    } catch (e) {
    // Those are "valid" exceptions. we can't catch them in one line as
    if (e.message.indexOf('Unexpected section') !== -1  ||
        e.message.indexOf('Atomic instructions') !== -1 ||
        e.message.indexOf('unknown table') !== -1 ||
        e.message.indexOf('Internal failure') !== -1 ||
        e.message.indexOf('Unexpected ') !== -1 ||
        e.message.indexOf('magic header') !== -1 ||
        e.message.indexOf('Unexpected') !== -1 ||
        e.message.indexOf('typeof') !== -1 ||
        e.message.indexOf('integer') !== -1 ||
        e.message.indexOf('Unknown') !== -1 ||
        e.message.indexOf('Unsupported') !== -1 ||
        e.message.indexOf('data section') !== -1 ||
        e.message.indexOf('unknown') !== -1 ||
        e.message.indexOf('zero flag expected') !== -1 ||
        e.message.indexOf('invalid UTF-8') !== -1 ||
        e.message.indexOf('function signature') !== -1
        ) {} 
        else { throw e; }
    }
}

module.exports = {
    fuzz
};