retitle 522453 non-root users cannot access the console from X tags 522453 + wontfix thanks
Hi Mauro,
Thanks for your report.
On Fri, Apr 03, 2009 at 10:51:11PM +0200, Mauro Sacchetto wrote:
> When I enter in a console, fgconsole works always fine.
> If I launch after the X-server, fgconsole works again.
> But if I enter with automatic login in X-server as simple user
> (I use KDE), fgconsole does work no more:
> ======================================================
> sam...@debian:~$ fgconsole
> Couldnt get a file descriptor referring to the console
> ======================================================
> for all /dev/tty are root's ownership.
> So it works fine only for root.
This is true. It doesn’t only affect fgconsole, but also chvt, openvt
and any other kbd utility which tries to get a console file descriptor.
These programs do their job by trying to open/ioctl these files (in this
order):
/proc/self/fd/0 (is a pseudo tty in your case)
/dev/tty (also PTY)
/dev/tty0 (only accessible to root)
/dev/vc/0 (doesn’t exist nowadays)
/dev/console (root)
std{in,out,err} (PTY)
As none of these is able to respond to a VT_GETSTATE ioctl, fgconsole
and friends fail. I’m afraid this situation won’t change.
Have a look at sudo if you need unprivileged users to run these
utilities in a secure manner.
All the best,
--
Michael Schutte <mi...@uiae.at>
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