| Summary: | gentoo-dev-sources-2.6.10-r4 doesn't allow non-root users to write/erase cd's with k3b | ||
|---|---|---|---|
| Product: | Gentoo Linux | Reporter: | Maciej Zieba <crocodilek> |
| Component: | [OLD] Core system | Assignee: | Gentoo Kernel Bug Wranglers and Kernel Maintainers <kernel> |
| Status: | RESOLVED INVALID | ||
| Severity: | normal | CC: | m.debruijne |
| Priority: | High | ||
| Version: | unspecified | ||
| Hardware: | x86 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Package list: | Runtime testing required: | --- | |
|
Description
Maciej Zieba
2005-01-14 00:08:04 UTC
Hi, I have gentoo-dev-sources-2.6.10-r4 kernel and k3b-0.11.18 When I run k3b as root my cd writer (LiteOn SOHR-5238S) is detected and I can write CDs without any problems. But when I run k3b as a normal (non-root) user my writer isn't detected, not even as a CD-ROM... Mounting and reading from CDs works. The relevant line in fstab: /dev/cdrom /mnt/cdrom auto noauto,users,ro 0 0 I haven't tried writing command line tools (cdrecord/cdrdao) but here's the output of "cdrecord dev=/dev/cdrom -checkdrive" for non-root user: bash-2.05b$ cdrecord dev=/dev/cdrom -checkdrive Cdrecord-Clone 2.01 (i686-pc-linux-gnu) Copyright (C) 1995-2004 Jörg Schilling cdrecord: Warning: Running on Linux-2.6.10-gentoo-r4 cdrecord: There are unsettled issues with Linux-2.5 and newer. cdrecord: If you have unexpected problems, please try Linux-2.4 or Solaris. scsidev: '/dev/cdrom' devname: '/dev/cdrom' scsibus: -2 target: -2 lun: -2 Warning: Open by 'devname' is unintentional and not supported. cdrecord: Permission denied. Cannot open '/dev/cdrom'. Cannot open SCSI driver. cdrecord: For possible targets try 'cdrecord -scanbus'. Make sure you are root. cdrecord: For possible transport specifiers try 'cdrecord dev=help'. I didn't have this problem with 2.6.9 kernels... Please let me know if there are any other details needed. Regards, Crocodil Reproducible: Always Steps to Reproduce: 1. 2. 3. Please check that you have write permissions to /dev/cdrom Hi, This is how it was: bash-2.05b$ ls -al /dev/cdrom lr-xr-xr-x 1 root root 13 Jan 14 09:07 /dev/cdrom -> cdroms/cdrom0 bash-2.05b$ ls -al /dev/cdroms/cdrom0 lr-xr-xr-x 1 root root 33 Jan 1 1970 /dev/cdroms/cdrom0 -> ../ide/host0/bus1/target0/lun0/cd bash-2.05b$ ls -al /dev/ide/host0/bus1/target0/lun0/cd brw-rw---- 1 root root 22, 0 Jan 1 1970 /dev/ide/host0/bus1/target0/lun0/cd So I did as you suggested: chmod o+rw /dev/ide/host0/bus1/target0/lun0/cd And now k3b does detect the writer :) "cdrecord dev=/dev/cdrom -checkdrive" works well now also. But why is it so? I never had to chmod it before and it worked... My non-root user does belong to cdrom and cdrw groups. Regards, Crocodil Security has been tightened up due to potential problems. As of recent kernels, you now need write access to the device to be able to write cd's (doesn't seem too unreasonable, yes? :) Come to think about it, it's very reasonable! :) Simply, it's something (I believe) not many people yet know about... ;) Thank you again for your help. I'm having the same problem, but "chmod o+rw"-ing it didn't solve anything :/ Here are my outputs of "cdrecord dev=/dev/cdrom -checkdrive" as root and as a normal user (myself): Root: # cdrecord dev=/dev/cdrom -checkdrive Cdrecord-Clone 2.01a28 (i686-pc-linux-gnu) Copyright (C) 1995-2004 J I'm having the same problem, but "chmod o+rw"-ing it didn't solve anything :/ Here are my outputs of "cdrecord dev=/dev/cdrom -checkdrive" as root and as a normal user (myself): Root: # cdrecord dev=/dev/cdrom -checkdrive Cdrecord-Clone 2.01a28 (i686-pc-linux-gnu) Copyright (C) 1995-2004 Jörg Schillin scsidev: '/dev/cdrom' devname: '/dev/cdrom' scsibus: -2 target: -2 lun: -2 Warning: Open by 'devname' is unintentional and not supported. Linux sg driver version: 3.5.27 Using libscg version 'schily-0.8'. Device type : Removable CD-ROM Version : 0 Response Format: 1 Vendor_info : 'PLEXTOR ' Identifikation : 'CD-R PX-W1610A' Revision : '1.05' Device seems to be: Generic mmc CD-RW. Using generic SCSI-3/mmc CD-R/CD-RW driver (mmc_cdr). Driver flags : MMC-3 SWABAUDIO BURNFREE FORCESPEED SINGLESESSION HIDECDR Supported modes: TAO PACKET SAO SAO/R96P SAO/R96R RAW/R16 RAW/R96P RAW/R96R Myself: $ cdrecord dev=/dev/cdrom -checkdrive Cdrecord-Clone 2.01a28 (i686-pc-linux-gnu) Copyright (C) 1995-2004 Jörg Schillin scsidev: '/dev/cdrom' devname: '/dev/cdrom' scsibus: -2 target: -2 lun: -2 Warning: Open by 'devname' is unintentional and not supported. Linux sg driver version: 3.5.27 Using libscg version 'schily-0.8'. Device type : Removable CD-ROM Version : 0 Response Format: 1 Vendor_info : 'PLEXTOR ' Identifikation : 'CD-R PX-W1610A' Revision : '1.05' Device seems to be: Generic mmc CD-RW. Using generic SCSI-3/mmc CD-R/CD-RW driver (mmc_cdr). Driver flags : MMC-3 SWABAUDIO BURNFREE Supported modes: Any other interesting outputs: $ groups kornelis wheel audio cdrom games cdrw users portage kornelis "kornelis" is my normal user account... $ uname -a Linux Jezus 2.6.10-gentoo-r4 #1 Sun Jan 9 03:23:25 CET 2005 i686 Intel(R) Pentium(R) 4 CPU 2.00GHz GenuineIntel GNU/Linux :/ Please post output of "ls -l /dev/cdrom" and check for any "unknown opcodes" in dmesg. |
