Re: applications working on uid 0

[Andreas Stricker <andreas stricker fela ch>]

chabayo wrote:
> ...the main problem is the execution of program code suppoesed to  
> processed in uid 0 - system is Linux
>
> The fact: I tried to handle the events in /proc/acpi/events by my own  
> application which integrates gtk handled display interaction.
>
> Because /proc/acpi/events is gid=0 (root) i would have to change the  
> gid of that file, or set the suid bit of an (gtk)executable owned by  
> root.

GTK is not save to run as suid exectutable.

One way is to write a daemon running as root and monitoring
/proc/acpi/events. The daemon is accessable by an IPC mechanism:
Unix/Network Socket, Shared memory, whatever.

The GUI is started by the user with user privileges and connect
to the daemon.

> Btw. for me it's also strange, still more a problem, to pop up a window  
> on a Display not owned by myself.
>
> It may be done by getting the ownder of the display, and merging the  
> .Xauthority (keys ever new produced by gdm - why!?), if arrangeable to  
> read.

With the solution mentioned above, there is no such magic required.

Cheers,
Andy