linux-kernel - Re: [PATCH v9 0/7] KEYS: trusted: Introduce support for NXP CAAM-based trusted keys

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Date:   Wed, 11 May 2022 12:47:02 +0200
From:   Ahmad Fatoum <a.fatoum@...gutronix.de>
To:     Michael Walle <michael@...le.cc>
Cc:     Jarkko Sakkinen <jarkko@...nel.org>,
        Horia Geantă <horia.geanta@....com>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        Pankaj Gupta <pankaj.gupta@....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>,
        Jan Luebbe <j.luebbe@...gutronix.de>,
        David Gstir <david@...ma-star.at>,
        Eric Biggers <ebiggers@...nel.org>,
        Richard Weinberger <richard@....at>,
        Franck LENORMAND <franck.lenormand@....com>,
        Sumit Garg <sumit.garg@...aro.org>,
        Andreas Rammhold <andreas@...mhold.de>,
        Tim Harvey <tharvey@...eworks.com>,
        Matthias Schiffer <matthias.schiffer@...tq-group.com>,
        linux-integrity@...r.kernel.org, keyrings@...r.kernel.org,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org
Subject: Re: [PATCH v9 0/7] KEYS: trusted: Introduce support for NXP
 CAAM-based trusted keys

Hello Michael,

On 06.05.22 12:52, Michael Walle wrote:
> Am 2022-05-06 08:25, schrieb Ahmad Fatoum:
>> Series applies on top of v5.18-rc5. Would be great if this could make it
>> into v5.19.
>>
>> v8 was here:
>> https://lore.kernel.org/linux-integrity/09e2552c-7392-e1da-926b-53c7db0b118d@pengutronix.de
>>
>> Changelog is beneath each individual patch. Compared to v8, only code
>> change is checking whether CAAM can support blobbing at init-time as
>> apparently some Layerscape SoCs are available in a non-E(ncryption)
>> variant that doesn't do AES. Previously, adding trusted keys on such
>> SoCs would return an error with a cryptic error message.
>>
>>
>> The Cryptographic Acceleration and Assurance Module (CAAM) is an IP core
>> built into many newer i.MX and QorIQ SoCs by NXP.
>>
>> Its blob mechanism can AES encrypt/decrypt user data using a unique
>> never-disclosed device-specific key.
>>
>> There has been multiple discussions on how to represent this within the kernel:
>>
>> The Cryptographic Acceleration and Assurance Module (CAAM) is an IP core
>> built into many newer i.MX and QorIQ SoCs by NXP.
>>
>> Its blob mechanism can AES encrypt/decrypt user data using a unique
>> never-disclosed device-specific key. There has been multiple
>> discussions on how to represent this within the kernel:
>>
>>  - [RFC] crypto: caam - add red blobifier
>>    Steffen implemented[1] a PoC sysfs driver to start a discussion on how to
>>    best integrate the blob mechanism.
>>    Mimi suggested that it could be used to implement trusted keys.
>>    Trusted keys back then were a TPM-only feature.
>>
>>  - security/keys/secure_key: Adds the secure key support based on CAAM.
>>    Udit Agarwal added[2] a new "secure" key type with the CAAM as backend.
>>    The key material stays within the kernel only.
>>    Mimi and James agreed that this needs a generic interface, not specific
>>    to CAAM. Mimi suggested trusted keys. Jan noted that this could serve as
>>    basis for TEE-backed keys.
>>
>>  - [RFC] drivers: crypto: caam: key: Add caam_tk key type
>>    Franck added[3] a new "caam_tk" key type based on Udit's work. This time
>>    it uses CAAM "black blobs" instead of "red blobs", so key material stays
>>    within the CAAM and isn't exposed to kernel in plaintext.
>>    James voiced the opinion that there should be just one user-facing generic
>>    wrap/unwrap key type with multiple possible handlers.
>>    David suggested trusted keys.
>>
>>  - Introduce TEE based Trusted Keys support
>>    Sumit reworked[4] trusted keys to support multiple possible backends with
>>    one chosen at boot time and added a new TEE backend along with TPM.
>>    This now sits in Jarkko's master branch to be sent out for v5.13
>>
>> This patch series builds on top of Sumit's rework to have the CAAM as
>> yet another
>> trusted key backend.
>>
>> The CAAM bits are based on Steffen's initial patch from 2015. His work had been
>> used in the field for some years now, so I preferred not to deviate
>> too much from it.
>>
>> This series has been tested with dmcrypt[5] on an i.MX6Q/DL and an i.MX8M[6].
>>
>> Looking forward to your feedback.
> 
> For the whole series:
> 
> Tested-by: Michael Walle <michael@...le.cc> # on ls1028a (non-E and E)

Thanks! Did you test checkpatch.pl and make htmldocs/pdfdocs too
or should I add the Tested-by just for the first 5 patches?

Cheers,
Ahmad

> 
> -michael
> 


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