[dm-crypt] Another LUKS problem

Arno Wagner arno at wagner.name
Sat Jun 9 13:09:36 CEST 2012

I do hope you have a LUKS header backup, what you are doing
comes with an extreme high risk of damaging the header or
key-slot aream with the associated permanent data-loss. 

That said, the simplest thing would be to enlarge sdb1 to
start at the same place and span the rest of the disk. 
Everything else risks putting in a partition header into
data, unless you know the sector-exact size the partition
had before or only use primary partitions. The filesystem 
inside the LUKS container will still be its original size 
and prevent overwriting of any other data.


On Sat, Jun 09, 2012 at 01:50:34AM -0700, tada at riseup.net wrote:
> Hey guys.
> Straigh to the problem:
> somehow partition table of my external harddrive got corrupted after last
> reboot. I did managed to restore the whole table with testdisk, but
> somehow the program was able to set up LUKS partition only to 1MB (i
> suppose it was able to figure only the header of the partition). The
> partition is at very beginning of the drive - starts at 63 and ends at
> 2118 (giving 2048 total sectors for the header)
> So the first question - is the header proper sized? I mean can it get
> corrupted by testdisk partition table writing procedure?
> And the other question - if i resize partition with fdisk (deleting and
> recreating it with restoring LUKS header at the very beginning) will it
> give me the possibility to access the data again? The thingy for now is
> that whenever i try to luksOpen the 1MB partition it returns me "Requested
> offset is beyond real size of device /dev/sdb1" which i suppose is good,
> and only thing i need is resizing the partition.
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Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno at wagner.name 
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One of the painful things about our time is that those who feel certainty 
are stupid, and those with any imagination and understanding are filled 
with doubt and indecision. -- Bertrand Russell 

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