Re: USB problem: /dev/ugen* dynamically auto-reconfigures to root:operator 644, so non-root user unable to access USB devices even if wanted

From: Bernd Walter <ticso_at_cicely12.cicely.de> Date: Mon, 20 Oct 2003 17:45:37 +0200 · This archive was generated by hypermail 2.4.0 : Wed May 19 2021 - 11:37:26 UTC

On Mon, Oct 20, 2003 at 01:44:50PM +0200, Poul-Henning Kamp wrote:
> In message <20031020113514.GA875_at_titan.klemm.apsfilter.org>, Andreas Klemm writ
> es:
> >root_at_titan[ttyp2]{6} ~ ls -l /dev/ugen*
> >crw-r--r--  1 root  operator  114,   0 Oct 20 13:14 /dev/ugen0
> >crw-r--r--  1 root  operator  114,   2 Oct 20 13:14 /dev/ugen0.2
> >crw-rw-rw-  1 root  operator  114,  16 Oct 20 13:14 /dev/ugen1
> >crw-r--r--  1 root  operator  114,  17 Oct 20 13:14 /dev/ugen1.1
> >crw-r--r--  1 root  operator  114,  18 Oct 20 13:14 /dev/ugen1.2
> >crw-r--r--  1 root  operator  114,  19 Oct 20 13:14 /dev/ugen1.3
> >
> >And voila, ther permission are wrong again.
> 
> I have no idea what goes on here.

An USB device can be switched between several alternative
configurations.
If such a change is requested (USB_SET_CONFIG) the devicenode for
everything but the control channel is recreated.

-- 
B.Walter                   BWCT                http://www.bwct.de
ticso_at_bwct.de                                  info_at_bwct.de