[dm-crypt] /dev/md1 is not a valid LUKS device

Arno Wagner arno at wagner.name
Wed Jul 6 12:22:20 CEST 2011


Hi Louis-David,

I cannot send you Email directly, since it seems the IP of my
mailserver is on some internal blacklist of your ISP. As there
is no information why it is on the list (and no SPAM was ever 
sent from my Mailserver, which is under my own control), I 
can only assume the postmaster incompetently blocked the
whole subnet, not just the offending host. To make matters
worse, there is no working contact email and I propose you 
switch ISPs to someone that knows how to run a mailserver.

Anyways, here is my answer to your second hexdump:

The header looks fine, but it is in the wrong place.
It should start at 0x00000000. Is there soem mapping
or offset specification missing?

Arno


On Wed, Jul 06, 2011 at 12:00:59PM +0200, Louis-David Mitterrand wrote:
> On Wed, Jul 06, 2011 at 11:44:59AM +0200, Arno Wagner wrote:
> > At least th eheader was not just overwritten and looks intact.
> > I have no idea why you get this error message.
>
> Ooops, my bad, I sent you a hexdump from the wrong server. Here is the
> correct one:
>
> 00000000  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> *
> 00100000  4c 55 4b 53 ba be 00 01  61 65 73 00 00 00 00 00  |LUKS....aes.....|
> 00100010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> 00100020  00 00 00 00 00 00 00 00  63 62 63 2d 65 73 73 69  |........cbc-essi|
> 00100030  76 3a 73 68 61 32 35 36  00 00 00 00 00 00 00 00  |v:sha256........|





On Wed, Jul 06, 2011 at 11:44:59AM +0200, Arno Wagner wrote:
> At least th eheader was not just overwritten and looks intact. 
> I have no idea why you get this error message.
> 
> Arno
> 
> On Wed, Jul 06, 2011 at 10:53:09AM +0200, Louis-David Mitterrand wrote:
> > Hi Arno,
> > 
> > I am resending this answer to the list, as I am not sure you got it.
> > From the hexdump can you just tell me whether it is likely or not that I
> > can recover my partition?
> > 
> > Thanks,
> > 
> > On Mon, Jul 04, 2011 at 11:10:24PM +0200, Arno Wagner wrote:
> > > On Mon, Jul 04, 2011 at 05:45:23PM +0200, Louis-David Mitterrand wrote:
> > > > Hi,
> > > > 
> > > > After a hardware crash I now get this error:
> > > > 
> > > > 	root at grml ~ # cryptsetup isLuks /dev/md1 
> > > > 	Device /dev/md1 is not a valid LUKS device
> > > > 
> > > > Am I basically fucked?
> > > 
> > > I assume you have no header backup? 
> > 
> > Alas no.
> > 
> > > If so, possibly, but not necessarily. Is this on an SSD? There
> > 
> > No SSD, md raid6 array on regular disks.
> > 
> > > the LUKS header could be in the same "sector" as a data area 
> > > (due large SSD actual sector size)
> > > 
> > > Can you send me the first 700 bytes of the partition as hexdump?
> > > You can get them for example like this:
> > > 
> > >   hd /dev/md1 | head -n 40
> > 
> > 00000000  4c 55 4b 53 ba be 00 01  61 65 73 00 00 00 00 00  |LUKS??..aes.....|
> > 00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> > 00000020  00 00 00 00 00 00 00 00  63 62 63 2d 65 73 73 69  |........cbc-essi|
> > 00000030  76 3a 73 68 61 32 35 36  00 00 00 00 00 00 00 00  |v:sha256........|
> > 00000040  00 00 00 00 00 00 00 00  73 68 61 31 00 00 00 00  |........sha1....|
> > 00000050  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> > 00000060  00 00 00 00 00 00 00 00  00 00 18 00 00 00 00 20  |............... |
> > 00000070  08 61 ee d5 da 46 75 45  3a 26 b7 68 ee 3a 4c 65  |.a???FuE:&?h?:Le|
> > 00000080  ce 97 79 5f 5e 5c 96 00  a3 e1 11 f2 83 74 e9 a6  |?.y_^\..??.?.t??|
> > 00000090  97 d1 fe 67 0b 30 0e f0  24 cb 7c 27 4e d1 57 a8  |.??g.0.?$?|'N?W?|
> > 000000a0  3e bc 9a d4 00 00 a6 81  32 39 63 61 32 63 31 32  |>?.?..?.29ca2c12|
> > 000000b0  2d 64 64 32 62 2d 34 33  61 66 2d 61 33 33 30 2d  |-dd2b-43af-a330-|
> > 000000c0  32 34 30 39 33 64 63 38  65 34 65 31 00 00 00 00  |24093dc8e4e1....|
> > 000000d0  00 ac 71 f3 00 02 9a 2d  e3 83 7c e6 f6 a2 10 ad  |.?q?...-?.|???.?|
> > 000000e0  53 72 23 25 82 22 80 8d  af 3b ea c8 0d 85 7a 18  |Sr#%."..?;??..z.|
> > 000000f0  5e 59 b0 92 b6 ca 5d e6  00 00 00 08 00 00 0f a0  |^Y?.??]?.......?|
> > 00000100  00 00 de ad 00 00 00 00  00 00 00 00 00 00 00 00  |..??............|
> > 00000110  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> > 00000120  00 00 00 00 00 00 00 00  00 00 01 08 00 00 0f a0  |...............?|
> > 00000130  00 00 de ad 00 00 00 00  00 00 00 00 00 00 00 00  |..??............|
> > 00000140  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> > 00000150  00 00 00 00 00 00 00 00  00 00 02 08 00 00 0f a0  |...............?|
> > 00000160  00 00 de ad 00 00 00 00  00 00 00 00 00 00 00 00  |..??............|
> > 00000170  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> > 00000180  00 00 00 00 00 00 00 00  00 00 03 08 00 00 0f a0  |...............?|
> > 00000190  00 00 de ad 00 00 00 00  00 00 00 00 00 00 00 00  |..??............|
> > 000001a0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> > 000001b0  00 00 00 00 00 00 00 00  00 00 04 08 00 00 0f a0  |...............?|
> > 000001c0  00 00 de ad 00 00 00 00  00 00 00 00 00 00 00 00  |..??............|
> > 000001d0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> > 000001e0  00 00 00 00 00 00 00 00  00 00 05 08 00 00 0f a0  |...............?|
> > 000001f0  00 00 de ad 00 00 00 00  00 00 00 00 00 00 00 00  |..??............|
> > 00000200  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> > 00000210  00 00 00 00 00 00 00 00  00 00 06 08 00 00 0f a0  |...............?|
> > 00000220  00 00 de ad 00 00 00 00  00 00 00 00 00 00 00 00  |..??............|
> > 00000230  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> > 00000240  00 00 00 00 00 00 00 00  00 00 07 08 00 00 0f a0  |...............?|
> > 00000250  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> > *
> > 00001000  2d 51 43 53 eb 1b 55 ac  05 9a b1 5f 57 33 31 11  |-QCS?.U?..?_W31.|
> > 
> > 
> > Thanks,
> > 
> 
> -- 
> Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno at wagner.name 
> GnuPG:  ID: 1E25338F  FP: 0C30 5782 9D93 F785 E79C  0296 797F 6B50 1E25 338F
> ----
> Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans
> 
> If it's in the news, don't worry about it.  The very definition of 
> "news" is "something that hardly ever happens." -- Bruce Schneier 
> _______________________________________________
> dm-crypt mailing list
> dm-crypt at saout.de
> http://www.saout.de/mailman/listinfo/dm-crypt
> 

-- 
Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno at wagner.name 
GnuPG:  ID: 1E25338F  FP: 0C30 5782 9D93 F785 E79C  0296 797F 6B50 1E25 338F
----
Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans

If it's in the news, don't worry about it.  The very definition of 
"news" is "something that hardly ever happens." -- Bruce Schneier 


More information about the dm-crypt mailing list