On Mon, Jan 28, 2019 at 08:14:09PM +0100, Marcus Glocker wrote:
> On some machines when the pckbc(4) keyboard controller driver attaches
> to the console, it's possible to inject characters by moving your mouse
> in to the keyboard channel. When injecting enough noise the keyboard
> will stop operating at some point. A nice way to test this, e.g. on my
> ThinkPad, is by entering in to UKC at boot time and then move your
> mouse.
>
> This diff will discard characters coming from the aux slot which are
> mixed in to the keyboard slot when we're still in console mode.
>
> This issue has been reported by deraadt@ who already has OK'ed the diff.
>
> Comments? Testing? More OKs?
I can confirm this fixes the issue on a lenovo X1 Carbon.
>
> Thanks,
> Marcus
>
>
> Index: sys/dev/ic/pckbc.c
> ===================================================================
> RCS file: /cvs/src/sys/dev/ic/pckbc.c,v
> retrieving revision 1.50
> diff -u -p -u -p -r1.50 pckbc.c
> --- sys/dev/ic/pckbc.c 11 Mar 2017 11:55:03 -0000 1.50
> +++ sys/dev/ic/pckbc.c 27 Jan 2019 09:01:31 -0000
> @@ -161,6 +161,9 @@ pckbc_poll_data1(bus_space_tag_t iot, bu
> if (slot == PCKBC_AUX_SLOT) {
> DPRINTF("lost kbd 0x%x\n", c);
> continue;
> + } else if (stat & KBS_AUXDATA) {
> + DPRINTF("discard aux data 0x%x\n", c);
> + continue;
> }
> }
> return (c);
>
