Re: CHOWN PB

[Michael Filz <m.filz@gmx.net>]

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On Friday 19 September 2003 00:46, you wrote:
> Hi,
> Ok here is the deal :
> I would like to allow users from a given group (let say the cpufreq
> group) to have write acces to /proc/cpufreq and
> /proc/sys/cpu/0/speed...I try the following :
>
> $ chown root:cpufreq /proc/cpufreq
> $ chmod 664 /proc/cpufreq
> And then...
> $ ls -l /proc/cpufreq
> ...show me that nothing changes.
>
> Any idea on how to solve this problem ? Because login as root every time
> I want to change the frequency is quite boring ( I would like to be able
> to use button of my window manager to change it), and because of that
> other people that use my laptop can change the frequency because they
> don't have the root passwd...
> Thx in advance...
> Mike

This is one of the few cases where suid root is really useful. Put everything 
you want in a script, suid it and put it in the bin directory of your choice. 
If you set the ownership of the script to root.cpufreq you might even be able 
to restrict its use to the group; if not you would have the script to check 
for allowed users or something.
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