[SOLVED] K3B - Error 255 when burning DVD from an .iso image

glupa4e · 10-20-2018, 11:50 AM

Hello

i am trying to burn a DVD from an .iso image. Unfortunately i am getting the following error. Please have a look at the output:

Code:

System
-----------------------
K3b Version: 2.0.3
KDE Version: 4.14.32
QT Version:  4.8.7
Kernel:      4.4.153

Used versions
-----------------------
cdrecord: 3.1

cdrecord
-----------------------
cdrecord: Operation not permitted. Warning: Cannot raise RLIMIT_MEMLOCK limits.
cdrecord: Cannot allocate memory. WARNING: Cannot do mlockall(2).
cdrecord: WARNING: This causes a high risk for buffer underruns.
cdrecord: Operation not permitted. WARNING: Cannot set RR-scheduler.
cdrecord: Permission denied. WARNING: Cannot set priority using setpriority().
cdrecord: WARNING: This causes a high risk for buffer underruns.
cdrecord: Insufficient 'file read' privileges. You will not be able to open all needed devices.
cdrecord: Insufficient 'file write' privileges. You will not be able to open all needed devices.
cdrecord: Insufficient 'device' privileges. You may not be able to send all needed SCSI commands, this my cause various unexplainable problems.
cdrecord: Insufficient 'memlock' privileges. You may get buffer underruns.
cdrecord: Insufficient 'priocntl' privileges. You may get buffer underruns.
cdrecord: Insufficient 'network' privileges. You will not be able to do remote SCSI.
scsidev: '/dev/sr0'
devname: '/dev/sr0'
scsibus: -2 target: -2 lun: -2
Warning: Open by 'devname' is unintentional and not supported.
Linux sg driver version: 3.5.27
SCSI buffer size: 64512
cdrecord: Warning: Cannot read drive buffer.
cdrecord: Warning: The DMA speed test has been skipped.
Cdrecord-ProDVD-ProBD-Clone 3.01 (x86_64-unknown-linux-gnu) Copyright (C) 1995-2015 Joerg Schilling
TOC Type: 1 = CD-ROM
Using libscg version 'schily-0.9'.
Driveropts: 'burnfree'
atapi: 1
Device type    : Removable CD-ROM
Version        : 5
Response Format: 2
Capabilities   : 
Vendor_info    : 'PLDS    '
Identifikation : 'DVD+-RW DS-8A8SH'
Revision       : 'KD13'
Device seems to be: Generic mmc2 DVD-R/DVD-RW/DVD-RAM.
Current: DVD+R
Profile: DVD+R/DL 
Profile: DVD+R (current)
Profile: DVD+RW 
Profile: DVD-R/DL layer jump recording 
Profile: DVD-R/DL sequential recording 
Profile: DVD-RW sequential recording 
Profile: DVD-RW restricted overwrite 
Profile: DVD-RAM 
Profile: DVD-R sequential recording 
Profile: DVD-ROM 
Profile: CD-RW 
Profile: CD-R 
Profile: CD-ROM 
Profile: Removable Disk 
Using generic SCSI-3/mmc-3 DVD+R driver (mmc_dvdplusr).
Driver flags   : NO-CD DVD MMC-3 SWABAUDIO BURNFREE FORCESPEED 
Supported modes: PACKET SAO LAYER_JUMP
Drive buf size : 718848 = 702 KB
FIFO size      : 4194304 = 4096 KB
cdrecord: Operation not permitted. rezero unit: scsi sendcmd: fatal error
CDB:  01 00 00 00 00 00
cdrecord: Operation not permitted. Cannot send SCSI cmd via ioctl.
cdrecord: Operation not permitted. Cannot open or use SCSI driver.
cdrecord: For possible targets try 'cdrecord -scanbus'. Make sure you are root.
cdrecord: For possible transport specifiers try 'cdrecord dev=help'.
Track 01: data  4479 MB        
Total size:     4479 MB = 2293604 sectors

cdrecord command:
-----------------------
/usr/bin/cdrecord -v gracetime=2 dev=/dev/sr0 speed=4 -sao driveropts=burnfree -data -tsize=2293604s -

Code:

bash-4.3$ ls -la /usr/bin/cdrecord 
-rwxr-xr-x 1 root root 480232 May 31  2016 /usr/bin/cdrecord

I am trying the operation as a normal user. I see there is the group execution right on cdrecord for the group root. Would it be enough to change it to a group where my normal user is a member of? My normal user is not a member of the group root.

Thanks!

orbea · 10-20-2018, 11:51 AM

I think something like this will help.

Code:

# chown root:somegroup /usr/bin/cdrecord
# chmod 4710 /usr/bin/cdrecord

And then make sure your user belongs to 'somegroup'.

bassmadrigal · 10-20-2018, 12:46 PM

This is covered in the CHANGES_AND_HINTS.TXT file on your install media or favorite mirror:

Code:

If you have permission errors when attempting to burn a cdrom or dvd image,
  such as the following:
    /usr/bin/cdrecord: Operation not permitted. Cannot send SCSI cmd via ioctl
  then cdrecord almost certainly needs root privileges to work correctly.
  One potential solution is to make the cdrecord and cdrdao binaries suid root,
  but this has possible security implications.  The safest way to do that is 
  to make those binaries suid root, owned by a specific group, and executable
  by only root and members of that group.  For most people, the example below
  will be sufficient (but adjust as desired depending on your specific needs):
    chown root:cdrom /usr/bin/cdrecord /usr/bin/cdrdao
    chmod 4750 /usr/bin/cdrecord /usr/bin/cdrdao
  If you don't want all members of the 'cdrom' group to be able to execute the
  two suid binaries, then create a special group (such as 'burning' which is
  recommended by k3b), use it instead of 'cdrom' in the line above, and add
  to it only the users you wish to have access to cdrecord and cdrdao.

ehartman · 10-20-2018, 01:37 PM

Quote:

Originally Posted by glupa4e

I am trying the operation as a normal user. I see there is the group execution right on cdrecord for the group root. Would it be enough to change it to a group where my normal user is a member of? My normal user is not a member of the group root.
Thanks!

The important thing for burning CD-roms or DVD's is that YOU are a member of the group (normally cdrom) of the device /dev/sr?.
The program k3b (and crecord too) is running as YOU, not as its owner/group, so it's YOU that needs the access to the device.
In _my_ system /dev/sr? are:
brw-rw---- 1 root cdrom 11, 0 2018-08-09 07:52:59 /dev/sr0
brw-rw---- 1 root cdrom 11, 1 2018-08-09 07:52:59 /dev/sr1
so anyone that belongs to group "cdrom" can write to it (and all other can NOT!).

So just make sure you're a member of that group (in /etc/group) and logout/in before trying it again.

brianL · 10-20-2018, 02:33 PM

As suggested in CHANGES_AND_HINTS, I created the burning group (as root, of course) and added brian to it. Everything works OK.