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References: <20160422140149.37e9ba4f@raxacoricophallapatorius>
From: Milan Broz <gmazyland@gmail.com>
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Date: Sat, 23 Apr 2016 10:45:52 +0200
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Subject: Re: [dm-crypt] unknown version
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To: Julien Lepiller <julien@lepiller.eu>, dm-crypt@saout.de

On 04/22/2016 02:01 PM, Julien Lepiller wrote:
> Hello,
> 
> I am trying to use cryptsetup with a disk that has been encrypted some
> time ago. I'm using Linux From Scratch, and built cryptsetup myself.
> What I see when I run luksOpen is the following (all commands are run
> as root) :
> 
> # cryptsetup 1.7.1 processing "cryptsetup --debug luksOpen /dev/sda1
> hdd"
...
> # Activating volume hdd [keyslot -1] using [none] passphrase.
> # dm version   OF   [16384] (*1)
> # device-mapper: version ioctl on  failed: Permission denied

This looks like you cannot access something (/dev/mapper/control?)
and then it just fails because of this initial failure.

Do you have SElinux switched on?

What is output of "dmsetup version" - does it work?

Milan