Understanding Sandbox Isolation: A Spectrum of Approaches from Linux Namespaces to WebAssembly
By
shayonj
Baker's choice. Dense with flavour, light on filler.
Summary
This article explores the spectrum of sandboxing and isolation techniques for running untrusted code in modern computing environments. It examines different approaches including Linux namespaces, gVisor, hardware-enforced microVMs, and WebAssembly, explaining how each provides different levels of isolation with varying boundaries and attack surfaces. The article emphasizes that the term 'isolation' is used loosely across different technologies, and choosing the right isolation boundary is crucial for multi-tenant workloads, AI agents, and other scenarios where untrusted code needs to be executed safely without compromising hosts or other tenants.
Key quotes
· 3 pulledThe word 'isolation' gets used loosely. A Docker container is 'isolated.' A microVM is 'isolated.' A WebAssembly module is 'isolated.' But these are fundamentally different things, with different boundaries, different attack surfaces, and different guarantees.
There is a lot of energy right now around sandboxing untrusted code. AI agents generating and executing code, multi-tenant platforms running customer scripts, RL training pipelines evaluating model outputs—basically, you have code you did not write, and you need to run it without letting it compromise the host, other tenants, or itself in unexpected ways.
A dive into the spectrum of sandboxing and isolation, from Linux namespaces and gVisor to hardware-enforced microVMs and WebAssembly, and why picking the right boundary matters for multi-tenant workloads.
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