918fe04351
PR-URL: https://github.com/nodejs/node/pull/58070 Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com> Reviewed-By: Darshan Sen <raisinten@gmail.com> Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com> Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
44 lines
1.6 KiB
JavaScript
44 lines
1.6 KiB
JavaScript
// Copyright 2024 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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// Flags: --sandbox-testing --expose-gc --allow-natives-syntax
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const kSeqStringType = Sandbox.getInstanceTypeIdFor("SEQ_ONE_BYTE_STRING_TYPE");
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const kStringLengthOffset = Sandbox.getFieldOffset(kSeqStringType, "length");
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// Helper function that spawns a worker thread that corrupts memory in the
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// background, constantly flipping the given address between valueA and valueB.
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function corruptInBackground(address, valueA, valueB) {
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function workerTemplate(address, valueA, valueB) {
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let memory = new DataView(new Sandbox.MemoryView(0, 0x100000000));
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while (true) {
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memory.setUint32(address, valueA, true);
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memory.setUint32(address, valueB, true);
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}
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}
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const workerCode = new Function(
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`(${workerTemplate})(${address}, ${valueA}, ${valueB})`);
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return new Worker(workerCode, {type: 'function'});
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}
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// Create the string object that we'll be corrupting.
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let string = Array(0x100).fill("A").join("");
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assertEquals(Sandbox.getInstanceTypeIdOf(string), kSeqStringType);
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assertEquals(string.length, 0x100);
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// Trigger some GCs to move the object to a stable position in memory.
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gc();
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gc();
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// Start the worker thread to corrupt the string in the background.
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let address = Sandbox.getAddressOf(string) + kStringLengthOffset;
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let valueA = 0x1;
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let valueB = 0x100;
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let worker = corruptInBackground(address, valueA, valueB);
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// Perform string Utf8 encoding in the foreground.
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for (let i = 0; i < 1000; i++) {
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%StringUtf8Value(string);
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}
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