busctl: add sudo shell via --show-machine and !/bin/bash

[Ryankapa]

What

Adds a sudo shell vector for busctl using --show-machine (which uses a pager) and the shell escape !/bin/bash.

How

• Run: sudo busctl --show-machine
• At the pager prompt, type: !/bin/bash
• Results in an elevated shell.

Why

If busctl is allowed to run as superuser via sudo, it does not drop elevated privileges and can be used to access the file system, escalate, or maintain privileged access. This documents that vector for the sudo context.

[cyrus-and]

Thanks, this is already covered.