direct access to IO space [Was: kernel level drivers - next try]

[Kuba Ober]

> > Yes for the last statement, but extraordinary user's mileage may vary.
> > It can choose between (a) running wine as root and (b) running
> > LIDS-patched kernel [8] plus this command:
> >
> >  # lidsadm -A -s /path/to/some_wine_binary_piece -o CAP_SYS_RAWIO  -j
> > GRANT
>
> Couldn't you also unmap the I/O ports memory and catch segmentation
> faults referring to that area, then reroute them through some system
> service running as root? It's safer than running wine as root.

All that one needs is a small setuid-root wrapper that grants needed ioperms 
and then folds back to regular user and execs wine.

Cheers, Kuba