linux-kernel - Re: [PATCH v1 0/3] KEYS: trusted: Introduce support for NXP CAAM-based trusted keys

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Date:   Wed, 17 Mar 2021 15:08:01 +0100
From:   Ahmad Fatoum <a.fatoum@...gutronix.de>
To:     Richard Weinberger <richard.weinberger@...il.com>
Cc:     Jarkko Sakkinen <jarkko@...nel.org>,
        Horia Geantă <horia.geanta@....com>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        Aymen Sghaier <aymen.sghaier@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        James Bottomley <jejb@...ux.ibm.com>, kernel@...gutronix.de,
        David Howells <dhowells@...hat.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Steffen Trumtrar <s.trumtrar@...gutronix.de>,
        Udit Agarwal <udit.agarwal@....com>,
        Jan Luebbe <j.luebbe@...gutronix.de>,
        David Gstir <david@...ma-star.at>,
        Franck LENORMAND <franck.lenormand@....com>,
        Sumit Garg <sumit.garg@...aro.org>,
        linux-integrity@...r.kernel.org, keyrings@...r.kernel.org,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        LSM <linux-security-module@...r.kernel.org>
Subject: Re: [PATCH v1 0/3] KEYS: trusted: Introduce support for NXP
 CAAM-based trusted keys

Hello Richard,

On 17.03.21 00:10, Richard Weinberger wrote:
> On Tue, Mar 16, 2021 at 6:24 PM Ahmad Fatoum <a.fatoum@...gutronix.de> wrote:
>> This series has been tested with dmcrypt[5] on an i.MX6DL.
> 
> Do have this series also in a git repo to pull from?
> I'd like to give it a test on various systems.

Yes, please pull git://git.pengutronix.de/afa/linux
Branch v5.12/topic/trusted-source-caam

It includes these three patches on top of Jarkko's linux-tpmdd/master.

>> Looking forward to your feedback.
> 
> Thanks for working on this! David and I will have a closer look these days.

Great. Here is a simple testing regiment that could help you getting started:

# First boot
    DEV=/dev/loop0
    ALGO=aes-cbc-essiv:sha256
    KEYNAME=kmk
    BLOCKS=20

    mount -o remount,rw /
    fallocate -l $((BLOCKS*512)) ~/loop0.img
    losetup -P $DEV ~/loop0.img
    KEY="$(keyctl add trusted $KEYNAME 'new 32' @s)"
    keyctl pipe $KEY >~/kmk.blob

    TABLE="0 $BLOCKS crypt $ALGO :32:trusted:$KEYNAME 0 $DEV 0 1 allow_discards"
    echo $TABLE | dmsetup create mydev
    echo $TABLE | dmsetup load mydev
    dd if=/dev/zero of=/dev/mapper/mydev || true
    echo "It works!" 1<> /dev/mapper/mydev
    cryptsetup close mydev

# Second boot
    DEV=/dev/loop0
    ALGO=aes-cbc-essiv:sha256
    KEYNAME=kmk
    BLOCKS=20

    losetup -P $DEV ~/loop0.img
    keyctl add trusted $KEYNAME "load $(cat ~/kmk.blob)" @s
    TABLE="0 $BLOCKS crypt $ALGO :32:trusted:$KEYNAME 0 $DEV 0 1 allow_discards"
    echo $TABLE | dmsetup create mydev
    echo $TABLE | dmsetup load mydev

# Should print that It works!
    hexdump -C /dev/mapper/mydev

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