Re: Bug#770211: LUKS partition types, redux

[Phillip Susi <psusi@ubuntu.com>]

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On 11/19/2014 5:24 PM, Dale R. Worley wrote:
> This raises the related question of whether there should be codes
> to identify the partition type inside the LUKS partition.  That is,
> the partition table code identifies the partition as a LUKS
> partition, but once one has supplied the keys for LUKS encryption,
> is there any way to tell the type of the encrypted partition
> without testing for magic numbers (using "file" or the like)?

Linux doesn't pay any attention to partition type codes anyhow and
just uses blkid to identify the contents.

> I suppose there aren't enough type codes in MBR to allow
> separately identifying "ext4 inside LUKS", but with GPT it would be
> possible, and even could be done systematically.  E.g., if the UUID
> for a partition type is XXX, then the partition type for that type
> inside of LUKS is MD5("LUKS" XXX)...
> 
> Then again, perhaps you would not want to reveal the type of the 
> encrypted partition.

That too.



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