[dm-crypt] Another LUKS problem

tada tada at riseup.net
Sun Jun 10 14:03:43 CEST 2012

Well everything worked really good.
After restoration of partition table i got my LUKS header back which was
part of the good news. The other part was about knowing exact start and
end sectors of the LUKS partition. So i just moved end sector to the one
i knew and got back my LUKS partition.

On 06/09/2012 02:09 PM, Arno Wagner wrote:
> 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.
> Arno
> 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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