Re: [linux-audio-user] ams, jackd & X as root? on debian

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Subject: Re: [linux-audio-user] ams, jackd & X as root? on debian
From: Jan \ (
Date: Fri Dec 27 2002 - 18:17:37 EET

Eric, Steve,

        There is an option in /etc/X11/xdm-config (if you are running xdm, kdm,
gdm) that will turn off X authorization. It is

DisplayManager._0.authorize: true

change this to false and anyone can connect. It's a bad idea though.
Doing the xhost + localhost is pretty safe but there are better
solutions. Next option - as you (local user) enter :

xauth list

This gives you a list of cookies that you can add as root to allow you
to use X. You just cut and paste the :0 and /unix cookies and do an
xauth add as root. Cleaner, yes, but it's a major pain. I'm assuming
that you are doing an su or su - to log in as root. The best thing you
can do is, instead of using su, to do ssh -l root localhost. This will
run the root user in a secure shell and will pass all X traffic
encrypted. It will use a proxy display server so there is no
authorization problem. You'll notice that your DISPLAY variable as root
is set to localhost:10.0 or something like that.

I will sometimes run as root (under fvwm2 to minimize latency problems)
but I've been doing UNIX system admin for 15 years so I feel fairly
comfortable with it. The only real danger running as root is that
you'll do something stupid (what we like to call an SOD).


On Fri, 2002-12-27 at 04:31, Steve Harris wrote:
> On Thu, Dec 26, 2002 at 10:41:32 -0500, Eric Dantan Rzewnicki wrote:
> > Anyway. I end up with an executable ams. When I run ./ams I get this:
> >
> > ./ams: error while loading shared libraries: cannot open
> > shared object file: No such file or directory
> >
> > I have that in /usr/local/lib/ so creating this link appears
> > to help:
> >
> > box1:/usr/lib# ln -s /usr/local/lib/
> >
> > Is that the correct sollution?
> No, delete that link then try running ldconfig as root, if that doesn't
> work, check your /etc/ includes /usr/local/lib.
> > box1:/home/eric/audio_code/ams-1.5.5# ./ams
> > ams: cannot connect to X server
> >
> > I assume this is because X is running as me (eric) and not as root. I'll
> > try getting out of X and starting it as root as soon as I finish writing
> > this message. But, is there a way to let root connect to the X server
> > that's running as eric?
> Run "xhost + localhost" as you to allow root to connect, there is a cleaner
> way involving cookies, but I cant remeber it. I'm supprised your
> distribution doesn't set that up automatically.
> > Do those of you running jackd as root also run your X session as root?
> No.
> - Steve

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