STEM与日常科技·英语30篇（3）
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WebAssembly Sandboxing and Memory Boundary Enforcement
WebAssembly沙箱机制与内存边界强制执行
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WebAssembly (Wasm) runs code in a strict sandbox where memory access is confined to a linear address space.
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Unlike JavaScript, Wasm modules cannot read arbitrary browser memory or call OS functions directly.
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Each module gets its own isolated memory buffer, and all loads/stores are bounds-checked at runtime.
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This prevents one malicious module from corrupting another’s data or leaking sensitive information.
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The sandbox enforces boundaries even when multiple Wasm modules run side by side in the same page.
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Compilers like Rust or C++ generate Wasm bytecode that respects these memory constraints automatically.
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These guarantees make Wasm suitable for untrusted plugins in editors or document processors.
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Browser engines validate every memory operation before execution, adding minimal overhead but strong safety.
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It’s why Figma can safely run community-made plugins without risking user files.
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This boundary enforcement is foundational to zero-trust computing on the web.