Re: PC speaker

[Phillip Susi]

Jan Engelhardt wrote:
> On Jun 15 2007 13:07, Phillip Susi wrote:
> > R.F. Burns wrote:
> > > However, over the past several weeks, the students have found more
> > > creative ways to abuse the PC speaker (outside of the OS.)  The Powers
> > > that Be are asking that the PC speakers be disabled completely.  With
> > > the small number of techs we have, it would be very impractical to go
> > > around to all systems and remove the PC speaker from each and every
> > > computer case.
> > Now I am curious; how are they getting the pc speaker to make any sound with
> > the kernel module disabled?
>
> ioperm(), inb(), and outb() from userspace. Needs root, though. Or 
> /dev/port, with write. Which comes to the question how they gained root. 
> Perhaps live cd? In which case, the OP should, as recommended in this 
> thread already, deactivate choosing boot devices, if that's possible.
>
> (Unfortunately, newer BIOSes with 'integrated bootmenu' with F8 or so, 
> but I have not seen a way to deactivate _that_ menu.)

He already said they don't have root access and that allowed him to stop 
them from accessing the sound card by setting appropriate permissions.

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