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From: "Samuel M Umbach" <dafi...@hotmail.com>
Subject: DVD-ROM problems
Date: 2000/02/08
Message-ID: <fa.hr9rdgv.f0s0jj@ifi.uio.no>#1/1
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Either the drive or the cdrom driver is storing a "disc size".  When I read 
from a regular CD-ROM or CD-R the "disc size" gets reset so that the entire 
disc is accesible.  When I insert a DVD, "disc size" isn't reset and I can 
only read up to the length of the last CD read.  (For example, if I read 
from the Win98 cd, then put in a DVD, I can only read the first 654,526,464 
bytes).  This is reading directly from the /dev/cdrom device.  On the DVD I 
actually get an EOF at 654,526,464 bytes.  The file system shows files 
beyond this point, but an attempt to read them yields an I/O error.  I'm not 
sure where to look for the problem, but I know it does not lie in the UDF 
filesystem driver (as I receive these errors without ever mounting the DVD)  
I think the problem is in cdrom.c or ide-cd.c

This is not a problem with CSS, as I am authenticating the disc with the 
command "tstdvd /dev/cdrom".  Before running this command it is only 
possible to read 1 - 10 MB of the disc before receiving an I/O error.

I have the latest cdrom driver patch and UDF patch for my kernel.

I have slackware 7.0, kernel version 2.2.13 and an Acer DVP 1040A (aka 
Pioneer 114).

Thanks a lot,
Sam Umbach
sum...@iastate.edu

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From: Samuel M Umbach <sum...@iastate.edu>
Subject: Re: DVD-ROM problems
Date: 2000/02/08
Message-ID: <fa.f7k2s6v.1k2garr@ifi.uio.no>#1/1
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I just got my hands on a Toshiba DVD drive (model
1212 I believe) and experience no problems.  This
indicates that the drive is storing the disc
length and failing to reset it for DVD's.  I
cannot find anyone else with this same drive under
Linux, so I ask anyone who has an Acer DVP1040A or
Pioneer 114 DVD-ROM drive to see if you get
similar results to what I receive on my system.
If so, I'd appreciate some help patching the cdrom
driver to work around this problem (it works fine
in windows).  BTW here's the code that I've been
using to read the drive, but it gets the job done:

http://www2.iastate.edu/~sumbach/charcount.c

This also allows one to test for the problem
without applying the UDF or CDROM patches.  You
may need to be root to run the program.  After
compiling with gcc charcount.c -o charcount you
can run it on any file (for my tests I used
charcount /dev/cdrom). Please CC my e-mail address
when replying.

-Sam Umbach
sum...@iastate.edu


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From: Jens Axboe <ax...@suse.de>
Subject: Re: DVD-ROM problems
Date: 2000/02/09
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On Tue, Feb 08 2000, Samuel M Umbach wrote:
> I just got my hands on a Toshiba DVD drive (model
> 1212 I believe) and experience no problems.  This
> indicates that the drive is storing the disc
> length and failing to reset it for DVD's.  I
> cannot find anyone else with this same drive under
> Linux, so I ask anyone who has an Acer DVP1040A or
> Pioneer 114 DVD-ROM drive to see if you get
> similar results to what I receive on my system.
> If so, I'd appreciate some help patching the cdrom
> driver to work around this problem (it works fine
> in windows).  BTW here's the code that I've been
> using to read the drive, but it gets the job done:
> 
> http://www2.iastate.edu/~sumbach/charcount.c
> 
> This also allows one to test for the problem
> without applying the UDF or CDROM patches.  You
> may need to be root to run the program.  After
> compiling with gcc charcount.c -o charcount you
> can run it on any file (for my tests I used
> charcount /dev/cdrom). Please CC my e-mail address
> when replying.

Let me see the errors before I make a judgement.

-- 
*  Jens Axboe <ax...@suse.de>
*  Linux CD-ROM Maintainer
*  http://www.kernel.dk

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From: "Samuel M Umbach" <dafi...@hotmail.com>
Subject: Re: DVD-ROM problems
Date: 2000/02/09
Message-ID: <fa.hvqbcgv.bg41jo@ifi.uio.no>#1/1
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>I'd need to see the error messages:

This is what I do at the root prompt (w/ the Pioneer drive)

#mount /dvd
#tstdvd /dev/cdrom
not Authenticated
Request AGID [1]...    AGID 0
Host Sending Challenge: 09 08 07 06 05 04 03 02 01 00
LU sent key1: FD 14 D4 74 2A
Drive Authentic - using varient 0
LU sent challenge: 23 22 8E F5 86 EE BB 8B CB 3F
Host sending key 2: 8D 8D 6B C7 9B
DVD is authenticated
Received Session Key:   B6 3D 2A 82 94
not Authenticated
Received Disc Key:      7A 7D 51 2E ED 2F 06 89 A6 6C
Authenticated

#cat /dvd/VIDEO_TS/VTS_02_1.VOB
cat: /dvd/VIDEO_TS/VTS_02_1.VOB: Input/output error

I do not receive the I/O error with the Toshiba drive, but only with the 
Pioneer drive.  I have gotten my hands on three more DVD drives from various 
makers and I should be able to test them and report back within a couple 
days.

fstab:
/dev/hda2   /        ext2     defaults
/dev/hda1   /win98   vfat     conv=a
/dev/hde1   /data    vfat     conv=a
/dev/hda3   none     swap     sw
/dev/cdrom  /cdrom   iso9660  noauto,user,ro
/dev/cdrom  /dvd     udf      noauto,user,ro
/dev/fd0    /floppy  vfat     noauto,user,conv=a

-Sam Umbach
sum...@iastate.edu

> > I just got my hands on a Toshiba DVD drive (model
> > 1212 I believe) and experience no problems.  This
> > indicates that the drive is storing the disc
> > length and failing to reset it for DVD's.  I
> > cannot find anyone else with this same drive under
> > Linux, so I ask anyone who has an Acer DVP1040A or
> > Pioneer 114 DVD-ROM drive to see if you get
> > similar results to what I receive on my system.
> > If so, I'd appreciate some help patching the cdrom
> > driver to work around this problem (it works fine
> > in windows).  BTW here's the code that I've been
> > using to read the drive, but it gets the job done:
> >
> > http://www2.iastate.edu/~sumbach/charcount.c
> >
> > This also allows one to test for the problem
> > without applying the UDF or CDROM patches.  You
> > may need to be root to run the program.  After
> > compiling with gcc charcount.c -o charcount you
> > can run it on any file (for my tests I used
> > charcount /dev/cdrom). Please CC my e-mail address
> > when replying.
>

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From: Jens Axboe <ax...@suse.de>
Subject: Re: DVD-ROM problems
Date: 2000/02/09
Message-ID: <fa.c4o0h0v.j2ar8h@ifi.uio.no>#1/1
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On Wed, Feb 09 2000, Samuel M Umbach wrote:
> This is what I do at the root prompt (w/ the Pioneer drive)
> 
> #mount /dvd
> #tstdvd /dev/cdrom

(usually you tstdvd prior to mounting, but it's usually not a problem).

> not Authenticated
> Request AGID [1]...    AGID 0
> Host Sending Challenge: 09 08 07 06 05 04 03 02 01 00
> LU sent key1: FD 14 D4 74 2A
> Drive Authentic - using varient 0
> LU sent challenge: 23 22 8E F5 86 EE BB 8B CB 3F
> Host sending key 2: 8D 8D 6B C7 9B
> DVD is authenticated
> Received Session Key:   B6 3D 2A 82 94
> not Authenticated
> Received Disc Key:      7A 7D 51 2E ED 2F 06 89 A6 6C
> Authenticated
> 
> #cat /dvd/VIDEO_TS/VTS_02_1.VOB
> cat: /dvd/VIDEO_TS/VTS_02_1.VOB: Input/output error

Ok, so it authenticates fine at least. I'd like to see the errors that
get dumped to the logs at this point (dmesg), this might not be a
plain I/O error.

-- 
*  Jens Axboe <ax...@suse.de>
*  Linux CD-ROM Maintainer
*  http://www.kernel.dk

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From: "Samuel M Umbach" <dafi...@hotmail.com>
Subject: Re: DVD-ROM problems
Date: 2000/02/10
Message-ID: <fa.htplenv.dgu1rv@ifi.uio.no>
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Below are the lines from dmesg as I follow these steps:

1) Insert CD-ROM (Windows 98 OEM CD)
2) mount /cd
    ISO 9660 Extensions: Microsoft Joliet Level 3
    ISOFS: changing to secondary root
3) umount /cd
4) insmod udf
    udf: registering filesystem
5) Remove CD, insert DVD (Tomorrow Never Dies)
6) tstdvd /dev/cdrom
7) mount /dvd
    UDF-fs DEBUG (lowlevel.c, 71): udf_get_last_session: XA disk: no, 
vol_desc_start=0
    UDF-fs DEBUG (super.c, 1334): udf_read_super: Multi-session=0
    UDF-fs DEBUG (lowlevel.c, 366): udf_get_last_block: BLKGETSIZE 
lblock=1278372
    UDF-fs DEBUG (super.c, 1343): udf_read_super: Lastblock=0
    UDF-fs DEBUG (super.c, 434): udf_vrs: Starting at sector 16 (2048 Byte 
Sectors)
    UDF-fs DEBUG (super.c, 461): udf_vrs: ISO9660 Primary Volume Descriptor 
found
    UDF-fs DEBUG (super.c, 470): udf_vrs: ISO9660 Volume Descriptor Set 
Terminator found
    UDF-fs DEBUG (super.c, 782): udf_vol_pvoldesc: recording time 891862088, 
1998/4/6 7:28 (1e20)
    UDF-fs DEBUG (super.c, 889): udf_load_logicalvol: Partition (0) type 1
    UDF-fs DEBUG (super.c, 931): udf_load_logicalvol: FileSet found in 
LogicalVolDesc at block=0, partition=0
    UDF-fs DEBUG (super.c, 828): udf_load_partdesc: Searching map: (0 == 0)
    UDF-fs DEBUG (super.c, 868): udf_load_partdesc: Partition (0:0 type 
1511) starts at physical 261, block length 4122530
    UDF-fs DEBUG (super.c, 1155): udf_load_partition: Using anchor in block 
256
    UDF-fs DEBUG (super.c, 756): udf_find_fileset: Fileset at block=0, 
partition=0
    UDF-fs DEBUG (super.c, 814): udf_find_fileset: Rootdir at block=2, 
partition=0
    UDF-fs INFO Mounting volume '', timestamp 1998/04/6 06:28
8) cat /dvd/VIDEO_TS/VTS_01_0.VOB > /dev/null (can read entire file)
9) cat /dvd/VIDEO_TS/VTS_01_1.VOB > /dev/null (can read part of file)
    (NOTE: this message is repeated many times, and fills dmesg's buffer)
     16:00: rw=0, want=639210, limit=639186
     dev 16:00 blksize=2048 blocknr=319604 sector=1278416 size=2048 count=1
     attempt to access beyond end of device
     (this message is repeated from want=639210 through want=639188 in 
increments of 2, although there may be previous lines that were pushed out 
of the buffer)
10) cat /dvd/VIDEO_TS/VTS_02_1.VOB > /dev/null (can't read file)
     attempt to access beyond end of device
     16:00: rw=0, want=4019352, limit=639186
     dev 16:00 blksize=2048 blocknr=2009675 sector=8038700 size=2048 count=1
     attempt to access beyond end of device
     16:00: rw=0, want=4019354, limit=639186
     dev 16:00 blksize=2048 blocknr=2009676 sector=8038700 size=2048 count=1
     attempt to access beyond end of device
     16:00: rw=0, want=4019352, limit=639186
     dev 16:00 blksize=2048 blocknr=2009675 sector=8038700 size=2048 count=1
     attempt to access beyond end of device
     16:00: rw=0, want=4019354, limit=639186
     dev 16:00 blksize=2048 blocknr=2009676 sector=8038700 size=2048 count=1
12) umount /dvd

Sorry for the verbosity of this message, I just want to make sure you have 
all that you need.  Also, that "limit=639186" is not dependant on which DVD 
I'm trying to read, but does change depending on the last CD I had mounted.  
That may be the root of my problem.

In my original message I mentioned a program I wrote to count characters in 
a file.  What I found was that if I mounted a CD-ROM, and it was 450 MB, 
then unmounted the CD and mounted and authenticated a DVD I could read 450MB 
from /dev/cdrom and then I received an EOF.  This doesn't happen with the 
Toshiba drive so that's why I figured it must be in the hardware and was 
hoping a work around could be found.

-Sam Umbach

>
>On Wed, Feb 09 2000, Samuel M Umbach wrote:
> > This is what I do at the root prompt (w/ the Pioneer drive)
> >
> > #mount /dvd
> > #tstdvd /dev/cdrom
>
>(usually you tstdvd prior to mounting, but it's usually not a problem).
>
> > not Authenticated
> > Request AGID [1]...    AGID 0
> > Host Sending Challenge: 09 08 07 06 05 04 03 02 01 00
> > LU sent key1: FD 14 D4 74 2A
> > Drive Authentic - using varient 0
> > LU sent challenge: 23 22 8E F5 86 EE BB 8B CB 3F
> > Host sending key 2: 8D 8D 6B C7 9B
> > DVD is authenticated
> > Received Session Key:   B6 3D 2A 82 94
> > not Authenticated
> > Received Disc Key:      7A 7D 51 2E ED 2F 06 89 A6 6C
> > Authenticated
> >
> > #cat /dvd/VIDEO_TS/VTS_02_1.VOB
> > cat: /dvd/VIDEO_TS/VTS_02_1.VOB: Input/output error
>
>Ok, so it authenticates fine at least. I'd like to see the errors that
>get dumped to the logs at this point (dmesg), this might not be a
>plain I/O error.
>
>--
>*  Jens Axboe <ax...@suse.de>
>*  Linux CD-ROM Maintainer
>*  http://www.kernel.dk

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From: Pavel Machek <pa...@ucw.cz>
Subject: [clueless] cryptography in DVD? Re: DVD-ROM problems
Date: 2000/02/11
Message-ID: <fa.f8smkmv.1204t3u@ifi.uio.no>#1/1
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Hi!

> > #mount /dvd
> > #tstdvd /dev/cdrom
> 
> (usually you tstdvd prior to mounting, but it's usually not a problem).
> 
> > not Authenticated
> > Request AGID [1]...    AGID 0
> > Host Sending Challenge: 09 08 07 06 05 04 03 02 01 00
> > LU sent key1: FD 14 D4 74 2A
> > Drive Authentic - using varient 0
> > LU sent challenge: 23 22 8E F5 86 EE BB 8B CB 3F
> > Host sending key 2: 8D 8D 6B C7 9B
> > DVD is authenticated
> > Received Session Key:   B6 3D 2A 82 94
> > not Authenticated
> > Received Disc Key:      7A 7D 51 2E ED 2F 06 89 A6 6C
> > Authenticated
...
> Ok, so it authenticates fine at least. I'd like to see the errors that
> get dumped to the logs at this point (dmesg), this might not be a
> plain I/O error.

Just out of curiosity, what is that? You need cryptography for your
DVD to work? What is it good for? Why does linux need to know if drive
knows some secret numbers?
								Pavel
-- 
I'm pa...@ucw.cz. "In my country we have almost anarchy and I don't care."
Panos Katsaloulis describing me w.r.t. patents me at dis...@linmodems.org

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From: Alan Cox <al...@lxorguk.ukuu.org.uk>
Subject: Re: [clueless] cryptography in DVD? Re: DVD-ROM problems
Date: 2000/02/11
Message-ID: <fa.g218rnv.155kjp5@ifi.uio.no>#1/1
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> > Ok, so it authenticates fine at least. I'd like to see the errors that
> > get dumped to the logs at this point (dmesg), this might not be a
> > plain I/O error.
> 
> Just out of curiosity, what is that? You need cryptography for your
> DVD to work? What is it good for? Why does linux need to know if drive
> knows some secret numbers?

DVD disks have a challenge/response unlock mechanism and then (badly)
crypt the data. Thats what the whole DVD decss row is about



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From: Jens Axboe <ax...@suse.de>
Subject: Re: [clueless] cryptography in DVD? Re: DVD-ROM problems
Date: 2000/02/13
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<200002091...@suse.de> <200002102...@bug.ucw.cz>
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On Thu, Feb 10 2000, Pavel Machek wrote:
> > > Received Session Key:   B6 3D 2A 82 94
> > > not Authenticated
> > > Received Disc Key:      7A 7D 51 2E ED 2F 06 89 A6 6C
> > > Authenticated
> 
> Just out of curiosity, what is that? You need cryptography for your
> DVD to work? What is it good for? Why does linux need to know if drive
> knows some secret numbers?

It's just a (pretty stupid) authentication sequence. Some DVD's
contain encrypted blocks that the drive will refuse to read, if it
has not been authenticated. Not all DVD's are encrypted though.

And let me just add that the kernel doesn't contain any of the
crypto stuff, it just provides the hooks and acts as a blissfully
ignorant messenger :)

-- 
*  Jens Axboe <ax...@suse.de>
*  Linux CD-ROM Maintainer
*  http://www.kernel.dk

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From: Jens Axboe <ax...@suse.de>
Subject: Re: DVD-ROM problems
Date: 2000/02/13
Message-ID: <fa.cagssbv.192ae0a@ifi.uio.no>#1/1
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On Wed, Feb 09 2000, Samuel M Umbach wrote:
> Sorry for the verbosity of this message, I just want to make sure you have 
> all that you need.  Also, that "limit=639186" is not dependant on which DVD 
> I'm trying to read, but does change depending on the last CD I had mounted.  
> That may be the root of my problem.

Hmm, makes it look like we're possibly missing a check media change
somewhere... I'll check up on that.

> In my original message I mentioned a program I wrote to count characters in 
> a file.  What I found was that if I mounted a CD-ROM, and it was 450 MB, 
> then unmounted the CD and mounted and authenticated a DVD I could read 450MB 
> from /dev/cdrom and then I received an EOF.  This doesn't happen with the 
> Toshiba drive so that's why I figured it must be in the hardware and was 
> hoping a work around could be found.

Probably not a hardware bug, but perhaps just a hardware deviation ;)

-- 
*  Jens Axboe <ax...@suse.de>
*  Linux CD-ROM Maintainer
*  http://www.kernel.dk

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