forked from LeenkxTeam/Kmake
43 lines
1.9 KiB
JavaScript
43 lines
1.9 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
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const kTypedArrayType = Sandbox.getInstanceTypeIdFor("JS_TYPED_ARRAY_TYPE");
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const kTypedArrayByteOffsetOffset =
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Sandbox.getFieldOffset(kTypedArrayType, "byte_offset");
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const kTypedArrayByteLengthOffset =
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Sandbox.getFieldOffset(kTypedArrayType, "byte_length");
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const kTypedArrayLengthOffset =
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Sandbox.getFieldOffset(kTypedArrayType, "length");
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const GB = 1024 * 1024 * 1024;
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const kMaxInSandboxBufferSize = 32*GB - 1;
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// Something reasonable, must be smaller than the maximum module size.
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const kBufferSize = 1 * GB;
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// When stored on-heap, these offsets and sizes are left shifted to guarantee
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// that they are always smaller than the maximum buffer size.
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const kBoundedSizeShift = 29;
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const kShiftedBufferSize = BigInt(kBufferSize) << BigInt(kBoundedSizeShift);
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let memory = new DataView(new Sandbox.MemoryView(0, 0x100000000));
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let array = new Uint8Array(new ArrayBuffer(0));
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let array_address = Sandbox.getAddressOf(array);
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let byte_offset_address = array_address + kTypedArrayByteOffsetOffset;
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memory.setBigUint64(byte_offset_address, 0xffffffffffffffffn, true);
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let byte_length_offset_address = array_address + kTypedArrayByteLengthOffset;
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memory.setBigUint64(byte_length_offset_address, kShiftedBufferSize, true);
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let length_offset_address = array_address + kTypedArrayLengthOffset;
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memory.setBigUint64(length_offset_address, kShiftedBufferSize, true);
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assertEquals(array.byteOffset, kMaxInSandboxBufferSize);
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assertEquals(array.byteLength, kBufferSize);
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// WebAssembly.Validate (and similar APIs) will access the TypedArray's data by
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// fetching the Data() of the associated ArrayBuffer's BackingStore, then
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// adding the ByteOffset(). The Data() of the BackingStore must never be
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// nullptr, otherwise we'd end up accessing out-of-sandbox memory.
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WebAssembly.validate(array);
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