Simon Willison • 11/12/2025

Fun-reliable side-channels for cross-container communication

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This technical article details a method for cross-container communication using POSIX advisory locks as a side-channel. It explains how processes in different containers can detect locks on /proc/self/ns/time to communicate, includes a C proof-of-concept, and provides Docker commands to run the demonstration, allowing chat between two containers.

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#posix #Container #Advisory Locks
Fun-reliable side-channels for cross-container communication

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