Luther Monson, Staff Software Engineer at SUSE

Luther Monson

Go by way of PHP · Containers · VMs · Windows · Kubernetes

Your Agent's Shell Allowlist Is Bypassable

A permission gate for AI agents' shell commands judged spellings instead of commands. I found several classes of bypass in shipmates' own gate, and one idea fixes most of them.

9-Minute Read

A shell command decomposed into the nested command lines the permission gate has to judge

Every shipmates crew member runs shell commands. Before any of them runs, it goes through a permission gate. The gate uses the same rule syntax as Claude Code settings: Bash(git status), Bash(rm *), Write(**/.claude/settings.json). The rules are merged from several layers:

A 1 TB Test: Building a Memory Watchdog for go test

A runaway test binary hit about 1 TB of commit charge and took my desktop down. Here's the PowerShell and POSIX sh wrapper I put around go test, and the bug in it that the Windows box couldn't show me.

8-Minute Read

go test process tree with per-package test binaries watched by the safe-test wrapper

On August 16th a server.test.exe from shipmates climbed to roughly 1 TB of commit charge on my Windows workstation. Windows Terminal was hosting several agent sessions in tabs. It hard-faulted with E_OUTOFMEMORY, and every one of those sessions died at the same moment. It wasn’t the first time either. An earlier one hit about 236 GB through an infinite filepath.Dir loop.

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Luther is a 20+ year software veteran specializing in backend APIs and architecting products. Employed at SUSE as the Team Lead for the Containers on Windows Team working on Rancher + Kubernetes