Re: grip and cdparanoia, must run suid?
On Wed, May 03, 2000 at 05:37:42AM -0700, Kenneth Scharf wrote:
> I installed grip, but I can't run in unless I am root
> (sudo, or suid). The error I get is 'can't access cd
> rom drive'. My /dev/scd1 is owned by root, group is
> cdrom. The drive is actually on /dev/hdc physically
> but I am running scsi-ide emulation. I also have a
> 'real' scsi cdrom that is /dev/scd0. I added myself
> to the cdrom group (edited /etc/group as root) and
> logged out and back in as myself. No joy, still can't
> run grip or cdparanoia (actually it was cdparanoia
> that issued the error message). I did chmod +s on
> cdparanoia and grip and then it worked. But I should
> be able to access the cdrom if I'm in the cdrom group?
> I can access my /dev/dsp device by adding myself to
> the audio group (I don't think xmmm is suid, I can run
> it as a user in the audio group).
> Ideas?
If it's anything like "real" scsi devices, then the scsi generic
devices must be writeable. Unfortunately these device id's can change
if you add or remove scsi devices. I wrote a script to correct the
permissions at system startup, but I must not be using it since I
can't find the script.
Anyway, notice that sg2 and sg3 are writeable by group cdrom. Only
one of the devices is really writeable, but the script changes all sg
devices back to crw------- root:root and then all cdroms (writeable or
not) to crw-rw---- root:cdrom.
freefall ~/technical $ ll /dev/sg*
crw------- 1 root root 21, 0 Aug 18 1999 /dev/sg0
crw------- 1 root root 21, 1 Aug 18 1999 /dev/sg1
crw------- 1 root root 21, 10 Aug 18 1999 /dev/sg10
crw------- 1 root root 21, 11 Aug 18 1999 /dev/sg11
crw------- 1 root root 21, 12 Aug 18 1999 /dev/sg12
crw------- 1 root root 21, 13 Aug 18 1999 /dev/sg13
crw------- 1 root root 21, 14 Aug 18 1999 /dev/sg14
crw------- 1 root root 21, 15 Aug 18 1999 /dev/sg15
crw------- 1 root root 21, 16 Aug 18 1999 /dev/sg16
crw-rw---- 1 root cdrom 21, 2 Aug 18 1999 /dev/sg2
crw-rw---- 1 root cdrom 21, 3 Aug 18 1999 /dev/sg3
crw------- 1 root root 21, 4 Aug 18 1999 /dev/sg4
crw------- 1 root root 21, 5 Aug 18 1999 /dev/sg5
crw------- 1 root root 21, 6 Aug 18 1999 /dev/sg6
crw------- 1 root root 21, 7 Aug 18 1999 /dev/sg7
crw------- 1 root root 21, 8 Aug 18 1999 /dev/sg8
crw------- 1 root root 21, 9 Aug 18 1999 /dev/sg9
I think cdparanoia had some docs on how to determine the scsi generic
device number to go along with a particular device, but I don't know how
ide emulation affects it.
--
Lee Bradshaw lee@sectionIV.com (preferred)
Alantro Communications lee@alantro.com
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