> > ...and using CAP_SYS_RAWIO...
>
> ... or were you complaining about 'jail' turning off CAP_SYS_RAWIO, rather
> than claiming that it is an unplugged hole?
I thought it was that. It was mostly for other list users that may try
to setup their UML jail, and forget about this.
> If so, that may be a problem, but I haven't seen anything that cares about
> CAP_SYS_RAWIO being off. That was the simplest way I could find to disable
> writing to /dev/kmem.
I don't understand here. So UML never ever permits access to
/dev/kmem? If so that is rather strange architecture.
Pavel
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