CHOWN PB

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

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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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There is no "setuid script" because the interpreter is not setuid. That's the reason why there is a setuid-perl.

You have to write a binary wrapper, or use perl with setuid-perl.

Best wishes

Norbert

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Norbert Preining <preining AT logic DOT at> Technische Universität Wien
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Dominik