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From: Arno Wagner <arno@wagner.name>
To: dm-crypt@saout.de
Subject: Re: [dm-crypt] How can a passphrase be incorrect even after `luksHeaderBackup` and `luksHeaderRestore`?
Date: Fri, 5 Aug 2011 16:55:21 +0200	[thread overview]
Message-ID: <20110805145521.GC15345@tansi.org> (raw)
In-Reply-To: <20110805145229.GB15345@tansi.org>

On Fri, Aug 05, 2011 at 04:52:29PM +0200, Arno Wagner wrote:
> On Fri, Aug 05, 2011 at 04:16:47PM +0200, Milan Broz wrote:
> > On 08/05/2011 02:11 PM, Paul Menzel wrote:
> > >> No, as from the output above, I do not see the same problem. What
> > >> could be the reason for this difference in behaviour?
> > > 
> > > On #lvm Milan suggested that the problem lies with the new drive
> > > having some misalignment
> > 
> > I have checked the dump and there is clear corruption of first keyslot
> > (0x1000 - 0x1400 offset).
> > 
> > I'll try to find the source of problem now.
> > 
> > Milan
> 
> Hi Milan,
> 
> just a thought: May this be a stray v1.2 RAID/md superblock?
> They are at 4k offset from the device start according to this:
> 
> https://raid.wiki.kernel.org/index.php/RAID_superblock_formats
> 

And an additional thought: If using /etc/raidtab instead of
autodetection (or a similar mechanism), is it possible the 
RAID superblock gets rewritten on boot and destroys the 
LUKS keyslot?
 
I have no idea whether this is possible, as I only ever used 
autodetection and distrust distro automagic even in Debian.

Arno
-- 
Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno@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 

  reply	other threads:[~2011-08-05 14:55 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-08-04 21:31 [dm-crypt] How can a passphrase be incorrect even after `luksHeaderBackup` and `luksHeaderRestore`? Paul Menzel
2011-08-04 23:18 ` Paul Menzel
2011-08-05  2:20   ` Milan Broz
2011-08-05  8:41     ` Paul Menzel
2011-08-05 12:11       ` Paul Menzel
2011-08-05 14:16         ` Milan Broz
2011-08-05 14:52           ` Arno Wagner
2011-08-05 14:55             ` Arno Wagner [this message]
2011-08-05 17:47             ` Milan Broz
2011-08-05 15:02           ` Paul Menzel
2011-08-05 15:08             ` Arno Wagner
2011-09-01 19:08           ` Paul Menzel

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