On Sat, Jul 27, 2019 at 06:17:08PM -0500, Bruce Dubbs via blfs-dev wrote:
> On 7/27/19 4:43 PM, Ken Moffat via blfs-dev wrote:
> > On Sat, Jul 27, 2019 at 04:09:30PM -0500, Bruce Dubbs via blfs-dev wrote:
> > >
> > > You don't have to build anything to test. You only need to add or remove
> > > the suid bit on $XORG_PREFIX/libexec/Xorg abd run startx.
>
> > My most recent BLFS builds are nominally dated as 22nd April, i.e.
> > before the introduction of elogind - will give it a go later (ati,
> > intel), and perhaps also on an 8.4 where I switched to modesetting
> > from ati). But I suspect all of those might be too old, otherwise
> > why did we not drop enable-suid sooner ?
>
> My understanding is that elogind is supposed to eliminate the need for Xorg
> to have the suid bit set. I don't think having that set is a big deal, but
> some people do.
>
> One of the problems is whether or not a display manager like kdm is in use.
> In that case, the DM comes up on tty1 by default and then when the desktop
> environment comes up, it still uses tty1.
>
> When we use startx, the system starts Xorg on the first tty that is unused.
> Since we have agetty running on tty[1-6] by default, it starts on tty7 which
> is
>
> crw--w---- 1 root tty 4, 7 Jul 11 11:50 /dev/tty7
>
> Something has to give a regular user permissions to rw tty7 and I think
> elogind is supposed to do that. But it does not work for me unless Xorg has
> the suid bit set.
>
> Whether we need to pursue this or not is an open question.
>
In other words, this does rely on elogind, so I need to build a
newer system before I can test if Xorg without suid works on my
hardware (no point building elogind, and rebuilding xorg-server and
whatever else got references to elogind, that will just be a further
distraction).
On the current (intel) system startx fails (and hangs until I hit
Ctrl-C) when /usr/libexec/Xorg is not suid, which is what your
explanation above implies.
ĸen
--
One pill makes you larger, And one pill makes you small.
And the ones that mother gives you, Don't do anything at all.
Go ask Alice, When she's ten feet tall.
-- Jefferson Airplane, White Rabbit
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