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Prince Caspian
n00b
Joined: 26 Oct 2002
Posts: 11
Location: Waterloo, Ontario, Canada
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 Posted: Mon Jun 28, 2004 2:15 pm Post subject: Getting /etc/group permissions to work |
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I am having a very basic problem: Even when I add users to /etc/group, it doesn't seem to give them access to files that have group permissions for that group. For example, my /etc/group has the following line:
| Code: | | video:x:27:root,kris,martha |
and my permissions on a device are as follows:
| Code: | | crw-rw---- 1 root video 195, 255 May 23 17:22 /dev/nvidiactl |
Despite this, running glxgears gives this error:
| Code: | Error: Could not open /dev/nvidiactl because the permissions
are too resticitive. Please see the FREQUENTLY ASKED QUESTIONS
section of /usr/share/doc/NVIDIA_GLX-1.0/README for steps
to correct. |
I've had similar problems with other devices, such as audio ones.
A final question: Once I get this working, can I put groups at the end of a group permissions line in /etc/group? For example, what I'd really like to have above is this:
| Code: | | video:x:27:root,users |
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brancaleone
n00b
Joined: 21 Jun 2004
Posts: 27
Location: Buenos Aires, Argentina
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| Posted: Mon Jun 28, 2004 4:06 pm Post subject: Getting /etc/group permissions to work |
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I suppose you have been messing with the permissions of /dev/nvidiactl, etc, setting them manually.
The normal owner and group of that file should be:
| Code: | | crw------- 1 oscar root 195, 255 Jan 1 1970 /dev/nvidiactl |
Where oscar is the current Xwindows user.
If you login as george (both users are in the video group) the file properties should change automatically to
| Code: | | ]crw------- 1 george root 195, 255 Jan 1 1970 /dev/nvidiactl |
I have tried it. I created a new user (george) and assigned him to the following groups:
audio, console, dialout, floppy, games, lp, video
Then I logged as george (with kdm), the file properties changed "by themselves" and I could run glxgears normally, with the nvidia hardware acceleration.
Regarding your final question, in my opinion the answer is a big, big NO!!
The names (root, etc) at the end of each group line are the users assigned to that group. I think you can't add groups to groups.
I hope this wil help you. Login as root, create a new user (I do it in KDE with kuser) add him to a few groups like the ones I mentioned and see if it works.
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Algunos son humildes porque no les han dado la oportunidad... |
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sapphirecat
Guru
Joined: 15 Jan 2003
Posts: 376
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| Posted: Mon Jun 28, 2004 5:56 pm Post subject: Re: Getting /etc/group permissions to work |
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| brancaleone wrote: | The normal owner and group of that file should be:
| Code: | | crw------- 1 oscar root 195, 255 Jan 1 1970 /dev/nvidiactl |
Where oscar is the current Xwindows user.
If you login as george (both users are in the video group) the file properties should change automatically to
| Code: | | crw------- 1 george root 195, 255 Jan 1 1970 /dev/nvidiactl |
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FWIW, that sounds like PAM doing its work, as defined in the /etc/security/console.perms file.
Prince Caspian, everyone who has logged in before /etc/group was changed needs to log out and back in for the new setting to take effect. You can verify whether the groups have changed by running the groups command.
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Former Gentoo user; switched to Kubuntu 7.04 when I got sick of waiting on gcc. Chance of thread necro if you reply now approaching 100%... |
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Prince Caspian
n00b
Joined: 26 Oct 2002
Posts: 11
Location: Waterloo, Ontario, Canada
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| Posted: Wed Jun 30, 2004 12:15 am Post subject: Re: Getting /etc/group permissions to work |
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| Quote: | | Prince Caspian, everyone who has logged in before /etc/group was changed needs to log out and back in for the new setting to take effect. You can verify whether the groups have changed by running the groups command. |
Ah, that was what I was missing. Heck, I'm usually logged in for weeks or months at a time. Thanks for the help! |
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