[dm-crypt] yet another header reconstruction question

Arno Wagner arno at wagner.name
Wed Feb 24 17:24:55 CET 2016

Excellent. Also, thank you for the feedback!


On Wed, Feb 24, 2016 at 09:43:02 CET, Florian Dotzer wrote:
> On 02/18/2016 02:51 AM, Florian Dotzer wrote:
> >> I tried dd on files to replace the first 512 bytes of a file , but
> >> the target file was completely replaced with this command :
> >>
> >> dd if=512_bytes_with_fixed_header of=file_with_first_64_MB_of_md0 bs=512 count=1
> > When the target is a file, you need to include "conv=notrunc" so
> > that the file will not be truncated to zero length when it is
> > opened. That is not an issue when the target is a block device,
> > but there is no harm in using "conv=notrunc" there, too.
> Thanks to Bob , Arno , Sven and all others. I was able to remount
> with the corrected LUKS Header . 
> Now I have a backup of the header and a backup of the key. 
> currently I am backing  up all data 
> Please enjoy a virtual drink of your choice ;-)) 
> Sorry  lsblk command was not available so I cannot report any output of that. 
> best wishes to all , Florian
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Arno Wagner,     Dr. sc. techn., Dipl. Inform.,    Email: arno at wagner.name
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