Re: [dm-crypt] wrong partition type with blkid command ?

[Aaron Lewis <aaron.lewis1989@gmail.com>]

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Hi, Arno Wagner
> If you create a raw dm-crypt partition with cryptsetup, there
> is no valiadation at all, i.e. you can do this on a non-encrypted
> partition and not get an error message.
> 
> Ir is extremely unlikely for encrypted data to just match the
> magic number, so something else is likely wrong here.

Hmm , checked util source code:


const struct blkid_idinfo luks_idinfo =
{
	.name		= "crypto_LUKS",
	.usage		= BLKID_USAGE_CRYPTO,
	.probefunc	= probe_luks,
	.magics		=
	{
		{ .magic = "LUKS\xba\xbe", .len = 6 },
		{ NULL }
	}
};

And also did a header dump in hex , magic code is correct anyway.

I'm just very curious , two luks partitions , one correct , the other is not.

OK , thanks for the quick reply ;-) 

What do you think this problem could be ? I really don't know how to detect 
partition type without magic number .. 

> 
> Arno
> 
> On Mon, Sep 06, 2010 at 08:33:58PM +0800, Aaron Lewis wrote:
> > Hi,
> > 
> > 	blkid told me the type of an encrypted partition is "ext4" , while
> > 
> > cryptsetup works fine.
> > 
> > * blkid /dev/sda8
> > /dev/sda8: LABEL="ROOT" UUID="92d7eb3f-617d-4d63-8d1c-86b99ddeb5e4"
> > TYPE="ext4"
> > 
> > ( TYPE should be crypto_LUKS )
> > 
> > I've went through util-linux's source code , all magic code are defined
> > here: shlibs/blkid/src/superblocks/luks.c
> > 
> > I should not modify partition directly , should be some tools could help
> > , anyone know ?
> > 
> > Many thanks !
> > 
> > 
> > 
> > 
> > _______________________________________________
> > dm-crypt mailing list
> > dm-crypt@saout.de
> > http://www.saout.de/mailman/listinfo/dm-crypt

-- 
Best Regards,
Aaron Lewis - PGP: 0x4A6D32A0
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