linux-kernel - Re: dm-crypt error when CONFIG_CRYPTO

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Date:   Fri, 20 Sep 2019 13:37:07 -0400
From:   Mike Snitzer <snitzer@...hat.com>
To:     Thibaut Sautereau <thibaut.sautereau@...p-os.org>,
        Milan Broz <gmazyland@...il.com>
Cc:     dm-devel@...hat.com, Alasdair Kergon <agk@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: Re: dm-crypt error when CONFIG_CRYPTO_AUTHENC is disabled

On Fri, Sep 20 2019 at 11:44am -0400,
Thibaut Sautereau <thibaut.sautereau@...p-os.org> wrote:

> Hi,
> 
> I just got a dm-crypt "crypt: Error allocating crypto tfm" error when
> trying to "cryptsetup open" a volume. I found out that it was only
> happening when I disabled CONFIG_CRYPTO_AUTHENC.
> 
> drivers/md/dm-crypt.c includes the crypto/authenc.h header and seems to
> use some CRYPTO_AUTHENC-related stuff. Therefore, shouldn't
> CONFIG_DM_CRYPT select CONFIG_CRYPTO_AUTHENC?

Yes, it looks like commit ef43aa38063a6 ("dm crypt: add cryptographic
data integrity protection (authenticated encryption)") should've added
'select CRYPTO_AUTHENC' to dm-crypt's Kconfig.  I'll let Milan weigh-in
but that seems like the right way forward.

Thanks for your report!
Mike