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34 lines
1.2 KiB
JavaScript
34 lines
1.2 KiB
JavaScript
// Copyright 2017 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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load('test/mjsunit/wasm/wasm-module-builder.js');
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var name = 'regression_684858';
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function patchNameLength(buffer) {
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var count = 0;
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var view = new Uint8Array(buffer);
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for (var i = 0, e = view.length - name.length; i <= e; ++i) {
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var subs = String.fromCharCode.apply(null, view.slice(i, i + name.length));
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if (subs != name) continue;
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++count;
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// One byte before this name, its length is encoded.
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// Patch this to 127, making it out of bounds.
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if (view.length >= 127) throw Error('cannot patch reliably');
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if (view[i - 1] != name.length) throw Error('unexpected length');
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view[i - 1] = 0x7f;
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}
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if (count != 1) throw Error('did not find name');
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}
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var builder = new WasmModuleBuilder();
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builder.addFunction(name, kSig_i_v)
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.addBody([kExprI32Const, 2, kExprI32Const, 0, kExprI32DivU])
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.exportAs('main');
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var buffer = builder.toBuffer();
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patchNameLength(buffer);
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var module = new WebAssembly.Module(buffer);
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var instance = new WebAssembly.Instance(module);
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assertThrows(() => instance.exports.main(), WebAssembly.RuntimeError);
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