Re: [dm-crypt] Encrypting DVD or CDROM from iso

[Davide Marchi <danjde@msw.it>]

Milan Broz ha scritto:
> [..]
> The whole problem was that the size of device was wrongly calculated
>   from the debug:
>   > # Device size 16777216, offset 16777216.
> 
> This is apparently device size covering only LUKS2 header (default 
> LUKS2 takes 16MB),
> no data at all - then the error is expected.

Ok ..but, not shure to have understand correctly :-\

>> [..]
>> 
>> All you need to do here is just to allocate requested size for data + 
>> 16M for header.
>> (I have no idea why the original post tries to do is such complicated 
>> way.)
>> 
>> Also you do not need to physically write the file, sparse file 
>> creation is much
>> faster here (try sizes in GB), just run (dd can do this using seek=... 
>> option too)
>>  truncate disk.img -s 100M
>> 

Right!

>> [..]
> [..]
> 
> just run "cryptsetup luksFormat disk.img" and "cryptsetup open disk.img 
> mybackupdisk"
> 
>> [..]
>>    genisoimage -R -J -joliet-long -graft-points -V $VOL_NAME -o
>> /dev/mapper/mybackupdisk $DIR_TO_COPY
> This losetup is automatic on luksClose (so not needed) if you remove 
> explicit loop allocation above.
>> # close the device
>> cryptsetup luksClose /dev/mapper/mybackupdisk && \
>>    losetup -d /dev/loop1
> 
> This losetup is automatic on luksClose (so not needed) if you remove 
> explicit loop allocation above.
> 
> Milan
> 

Fine, nevertheless, the problem is still there!
Indeed building a DVD (or CDROM) with this procedure, obtain the same 
block error:

> Nov 19 13:56:36 localhost colord-sane: io/hpmud/pp.c 627: unable to 
> read device-id ret=-1
> Nov 19 13:57:05 localhost kernel: [ 2470.017097] device-mapper: table: 
> 253:2: len=2093055 not aligned to h/w logical block size 2048 of sr2
> Nov 19 13:57:05 localhost kernel: [ 2470.017099] device-mapper: core: 
> Cannot calculate initial queue limits
> Nov 19 13:57:05 localhost kernel: [ 2470.017102] device-mapper: ioctl: 
> unable to set up device queue for new table.
> Nov 19 13:57:05 localhost gnome-shell[2243]: Unable to mount volume 
> Volume cifrato da 1,7 GB: Gio.IOErrorEnum: Error unlocking /dev/sr2: 
> Failed to activate device: Invalid argument

What I should do for create an iso aligned to h/w logical block size? 
:-\
I've try using Gnome Shell automount and manually, same!


I'm going out crazy!! :-D


Thanks again!


Davide