Re: ide-cd problems

[tabris]

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On Sunday 01 August 2004 11:57 am, Jens Axboe wrote:
> On Sun, Aug 01 2004, Alexander E. Patrakov wrote:
> > Zinx Verituse wrote:
> > >I don't believe command filtering is neccessary, since all of the
> > >ide-cd ioctls are still there (ioctls that allow playing, reading,
> > > etc) Only the SG_IO ioctl itself would have to be checked (i.e.,
> > > not each individual command available with SG_IO, just the
> > > overall ioctl itself, categorizing all of SG_IO more or less as
> > > raw IO.  If this isn't doable with the current design, then the
> > > ide-cd interface should at least be very conspicuously documented
> > > as being extremely insecure as far as "read" access is concerned,
> > > as I know I wouldn't expect users to be able to overwrite my
> > > drive's firmware simply by granting the read access.
> >
> > Remember that it is still possible to write CDs through ide-cd in
> > 2.4.x using some pre-alpha code in cdrecord:
> >
> > cdrecord dev=ATAPI:1,1,0 image.iso
>
> (don't trim cc lists on linux-kernel!)
>
> Don't ever use that interface, period. It's not just the cdrecord
> code that may be alpha (I doubt it matters, it's easy to use), the
> interface it uses is not worth the lines of code it occupies.
	Then we have a severe disagreement between the cdrecord code (or at 
least the runtime warnings) and the Linux-Kernel IDE folks. 
specifically, these lines, while running with cdrecord dev=/dev/cdrom

scsidev: '/dev/cdrom'
devname: '/dev/cdrom'
scsibus: -2 target: -2 lun: -2
Warning: Open by 'devname' is unintentional and not supported.

	I've attached two logs, one using the ATAPI interface, one using your 
suggested interface. Frankly, both have rather nasty warnings on them, 
and one gets to wondering what the cdrecord authors want...

	Maybe we should be cc:ing the authors of cdrecord as well?

- --
tabris
- -
Remember, Grasshopper, falling down 1000 stairs begins by tripping over
the first one.
		-- Confusion
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cdrecord: No write mode specified.
cdrecord: Asuming -tao mode.
cdrecord: Future versions of cdrecord may have different drive dependent defaults.
scsidev: 'ATAPI:0,0,0'
devname: 'ATAPI'
scsibus: 0 target: 0 lun: 0
Warning: Using ATA Packet interface.
Warning: The related libscg interface code is in pre alpha.
Warning: There may be fatal problems.
SCSI buffer size: 64512
Cdrecord-Clone 2.01a27-dvd (i686-pc-linux-gnu) Copyright (C) 1995-2004 Jörg Schilling
Note: This version is an unofficial (modified) version with DVD support
Note: and therefore may have bugs that are not present in the original.
Note: Please send bug reports or support requests to <warly@xxxxxxxxxxxxxxxx>.
Note: The author of cdrecord should not be bothered with problems in this version.
TOC Type: 1 = CD-ROM
Using libscg version 'schily-0.8'.
atapi: 1
Device type    : Removable CD-ROM
Version        : 0
Response Format: 2
Capabilities   : 
Vendor_info    : 'TDK     '
Identifikation : 'CDRW241040B     '
Revision       : '57S2'
Device seems to be: Generic mmc CD-RW.
Current: 0x0009
Profile: 0x000A 
Profile: 0x0009 (current)
Profile: 0x0008 
Profile: 0x0002 (current)
Using generic SCSI-3/mmc   CD-R/CD-RW driver (mmc_cdr).
Driver flags   : MMC-3 SWABAUDIO BURNFREE 
Supported modes: TAO PACKET SAO SAO/R96P SAO/R96R RAW/R16 RAW/R96P RAW/R96R
Drive buf size : 1966272 = 1920 KB
FIFO size      : 4194304 = 4096 KB
cdrecord: No write mode specified.
cdrecord: Asuming -tao mode.
cdrecord: Future versions of cdrecord may have different drive dependent defaults.
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
cdrecord: Warning: using inofficial libscg transport code version (warly-scsi-linux-sg.c-1.80-mdk '@(#)scsi-linux-sg.c	1.80 04/03/08 Copyright 1997 J. Schilling').
SCSI buffer size: 64512
Cdrecord-Clone 2.01a27-dvd (i686-pc-linux-gnu) Copyright (C) 1995-2004 Jörg Schilling
Note: This version is an unofficial (modified) version with DVD support
Note: and therefore may have bugs that are not present in the original.
Note: Please send bug reports or support requests to <warly@xxxxxxxxxxxxxxxx>.
Note: The author of cdrecord should not be bothered with problems in this version.
TOC Type: 1 = CD-ROM
Using libscg version 'schily-0.8'.
atapi: 1
Device type    : Removable CD-ROM
Version        : 0
Response Format: 2
Capabilities   : 
Vendor_info    : 'TDK     '
Identifikation : 'CDRW241040B     '
Revision       : '57S2'
Device seems to be: Generic mmc CD-RW.
Current: 0x0009
Profile: 0x000A 
Profile: 0x0009 (current)
Profile: 0x0008 
Profile: 0x0002 (current)
Using generic SCSI-3/mmc   CD-R/CD-RW driver (mmc_cdr).
Driver flags   : MMC-3 SWABAUDIO BURNFREE 
Supported modes: TAO PACKET SAO SAO/R96P SAO/R96R RAW/R16 RAW/R96P RAW/R96R
Drive buf size : 1966272 = 1920 KB
FIFO size      : 4194304 = 4096 KB
Track 01: data   405 MB        
Total size:      466 MB (46:10.90) = 207818 sectors
Lout start:      466 MB (46:12/68) = 207818 sectors
Current Secsize: 2048
ATIP info from disk:
  Indicated writing power: 4
  Is not unrestricted
  Is not erasable
  Disk sub type: Medium Type A, high Beta category (A+) (3)
  ATIP start of lead in:  -11849 (97:24/01)
  ATIP start of lead out: 359848 (79:59/73)
Disk type:    Long strategy type (Cyanine, AZO or similar)
Manuf. index: 25
Manufacturer: Taiyo Yuden Company Limited
Blocks total: 359848 Blocks current: 359848 Blocks remaining: 152030
Starting to write CD/DVD at speed   8.0 in dummy TAO mode for single session.
Last chance to quit, starting dummy write in 9 seconds.   8 seconds.cdrecord: fifo had 64 puts and 0 gets.
cdrecord: fifo was 0 times empty and 1 times full, min fill was 0%.