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From: Aaron Lewis <aaron.lewis1989@gmail.com>
Date: Mon, 6 Sep 2010 20:57:53 +0800
References: <201009062034.05071.aaron.lewis1989@gmail.com>
 <20100906124812.GA13044@tansi.org>
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Subject: Re: [dm-crypt] wrong partition type with blkid command ?
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To: dm-crypt@saout.de
Cc: Arno Wagner <arno@wagner.name>

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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.
>=20
> 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 =3D
{
	.name		=3D "crypto_LUKS",
	.usage		=3D BLKID_USAGE_CRYPTO,
	.probefunc	=3D probe_luks,
	.magics		=3D
	{
		{ .magic =3D "LUKS\xba\xbe", .len =3D 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 no=
t.

OK , thanks for the quick reply ;-)=20

What do you think this problem could be ? I really don't know how to detect=
=20
partition type without magic number ..=20

>=20
> Arno
>=20
> On Mon, Sep 06, 2010 at 08:33:58PM +0800, Aaron Lewis wrote:
> > Hi,
> >=20
> > 	blkid told me the type of an encrypted partition is "ext4" , while
> >=20
> > cryptsetup works fine.
> >=20
> > * blkid /dev/sda8
> > /dev/sda8: LABEL=3D"ROOT" UUID=3D"92d7eb3f-617d-4d63-8d1c-86b99ddeb5e4"
> > TYPE=3D"ext4"
> >=20
> > ( TYPE should be crypto_LUKS )
> >=20
> > I've went through util-linux's source code , all magic code are defined
> > here: shlibs/blkid/src/superblocks/luks.c
> >=20
> > I should not modify partition directly , should be some tools could help
> > , anyone know ?
> >=20
> > Many thanks !
> >=20
> >=20
> >=20
> >=20
> > _______________________________________________
> > dm-crypt mailing list
> > dm-crypt@saout.de
> > http://www.saout.de/mailman/listinfo/dm-crypt

=2D-=20
Best Regards,
Aaron Lewis - PGP: 0x4A6D32A0
=46ingerPrint EA63 26B2 6C52 72EA A4A5 EB6B BDFE 35B0 4A6D 32A0
irc: A4R0NL3WI5 on freenode

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