Hi Keith,

> > Presumably, anything giving access to reboot(2), which reboot(8)
> > doesn't, would do.
> 
> Actually, bear in mind that the method I outlined will have only
> /bin/bash running (other than the kernel, etc). The easiest, if
> somewhat dramatic, way out from the keyboard is to type ^D, which will
> crash the system immediately (exercise for reader: why?). So, you may
> as well just hit the power switch...

Yes, that's my point.  This isn't single-user mode where exiting the
shell would continue with a multi-user boot so one's stuck.
Pre-upstart, reboot(8) would use reboot(2) and the kernel would, well,
re-boot, no need to power off.  The simple user-space interface to those
system calls has been taken away.

Cheers, Ralph.

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