Sandboxes sit 3 abstraction layers from hardware; thermal side channel only ~8 bits/hour
HanchungLee · x · 2026-09-18
- Hanchung Lee argues datacenters don't run on bare metal: EC2 VMs sit on hypervisors, k8s on top of the OS, and sandboxes on VMs/k8s — three abstraction layers from the physical hardware.
- Without hypervisor/OS-level root access, you can't read CPU, RAM, or motherboard temperature probes; only a local physical box would expose them, which is uncommon at scale.
- Even the thermal side channel is physically constrained, at roughly 8 bits per hour of bandwidth.
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