RE: [EXT] [PATCH v7 0/6] KEYS: trusted: Introduce support for NXP CAAM-based trusted keys

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Hi Ahmad,

I have tested the patch-set.
It is working as expected even when CAAM is compiled as kernel module.

Reviewed-by: Pankaj Gupta <pankaj.gupta@xxxxxxx>
Tested-by: Pankaj Gupta <pankaj.gupta@xxxxxxx>

Regards
Pankaj

> -----Original Message-----
> From: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
> Sent: Saturday, April 16, 2022 2:27 AM
> To: Jarkko Sakkinen <jarkko@xxxxxxxxxx>; Horia Geanta
> <horia.geanta@xxxxxxx>; Mimi Zohar <zohar@xxxxxxxxxxxxx>; Pankaj
> Gupta <pankaj.gupta@xxxxxxx>; Herbert Xu
> <herbert@xxxxxxxxxxxxxxxxxxx>; David S. Miller <davem@xxxxxxxxxxxxx>;
> James Bottomley <jejb@xxxxxxxxxxxxx>
> Cc: kernel@xxxxxxxxxxxxxx; David Howells <dhowells@xxxxxxxxxx>; James
> Morris <jmorris@xxxxxxxxx>; Serge E. Hallyn <serge@xxxxxxxxxx>; Steffen
> Trumtrar <s.trumtrar@xxxxxxxxxxxxxx>; Jan Luebbe
> <j.luebbe@xxxxxxxxxxxxxx>; David Gstir <david@xxxxxxxxxxxxx>; Eric Biggers
> <ebiggers@xxxxxxxxxx>; Richard Weinberger <richard@xxxxxx>; Franck
> Lenormand <franck.lenormand@xxxxxxx>; Sumit Garg
> <sumit.garg@xxxxxxxxxx>; Andreas Rammhold <andreas@xxxxxxxxxxx>;
> tharvey@xxxxxxxxxxxxx; Matthias Schiffer <matthias.schiffer@xxxxx-
> group.com>; linux-integrity@xxxxxxxxxxxxxxx; keyrings@xxxxxxxxxxxxxxx;
> linux-crypto@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; linux-security-
> module@xxxxxxxxxxxxxxx
> Subject: [EXT] [PATCH v7 0/6] KEYS: trusted: Introduce support for NXP
> CAAM-based trusted keys
> 
> Caution: EXT Email
> 
> Series applies on top of v5.18-rc2
> 
> v6 was here:
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.k
> ernel.org%2Flinux-integrity%2F20220316164335.1720255-1-
> a.fatoum%40pengutronix.de%2F&amp;data=04%7C01%7Cpankaj.gupta%40n
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> 
> Changelog is beneath each individual patch.
> 
> 
> 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.
> 
> Cheers,
> Ahmad
> 
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> ---
> To: Jarkko Sakkinen <jarkko@xxxxxxxxxx>
> To: "Horia Geantă" <horia.geanta@xxxxxxx>
> To: Mimi Zohar <zohar@xxxxxxxxxxxxx>
> To: Pankaj Gupta <pankaj.gupta@xxxxxxx>
> To: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
> To: "David S. Miller" <davem@xxxxxxxxxxxxx>
> To: James Bottomley <jejb@xxxxxxxxxxxxx>
> Cc: David Howells <dhowells@xxxxxxxxxx>
> Cc: James Morris <jmorris@xxxxxxxxx>
> Cc: "Serge E. Hallyn" <serge@xxxxxxxxxx>
> Cc: Steffen Trumtrar <s.trumtrar@xxxxxxxxxxxxxx>
> Cc: Jan Luebbe <j.luebbe@xxxxxxxxxxxxxx>
> Cc: David Gstir <david@xxxxxxxxxxxxx>
> Cc: Eric Biggers <ebiggers@xxxxxxxxxx>
> Cc: Richard Weinberger <richard@xxxxxx>
> Cc: Franck LENORMAND <franck.lenormand@xxxxxxx>
> Cc: Sumit Garg <sumit.garg@xxxxxxxxxx>
> Cc: Andreas Rammhold <andreas@xxxxxxxxxxx>
> Cc: Tim Harvey <tharvey@xxxxxxxxxxxxx>
> Cc: Matthias Schiffer <matthias.schiffer@xxxxxxxxxxxxxxx>
> Cc: linux-integrity@xxxxxxxxxxxxxxx
> Cc: keyrings@xxxxxxxxxxxxxxx
> Cc: linux-crypto@xxxxxxxxxxxxxxx
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> Cc: linux-security-module@xxxxxxxxxxxxxxx
> 
> Ahmad Fatoum (6):
>   KEYS: trusted: allow use of TEE as backend without TCG_TPM support
>   KEYS: trusted: allow use of kernel RNG for key material
>   crypto: caam - add in-kernel interface for blob generator
>   KEYS: trusted: Introduce support for NXP CAAM-based trusted keys
>   doc: trusted-encrypted: describe new CAAM trust source
>   MAINTAINERS: add myself as CAAM trusted key maintainer
> 
>  .../admin-guide/kernel-parameters.txt         |  11 ++
>  .../security/keys/trusted-encrypted.rst       |  60 ++++++-
>  MAINTAINERS                                   |   9 +
>  drivers/crypto/caam/Kconfig                   |   3 +
>  drivers/crypto/caam/Makefile                  |   1 +
>  drivers/crypto/caam/blob_gen.c                | 164 ++++++++++++++++++
>  include/keys/trusted-type.h                   |   2 +-
>  include/keys/trusted_caam.h                   |  11 ++
>  include/soc/fsl/caam-blob.h                   | 102 +++++++++++
>  security/keys/Kconfig                         |  18 +-
>  security/keys/trusted-keys/Kconfig            |  38 ++++
>  security/keys/trusted-keys/Makefile           |  10 +-
>  security/keys/trusted-keys/trusted_caam.c     |  82 +++++++++
>  security/keys/trusted-keys/trusted_core.c     |  45 ++++-
>  14 files changed, 527 insertions(+), 29 deletions(-)  create mode 100644
> drivers/crypto/caam/blob_gen.c  create mode 100644
> include/keys/trusted_caam.h  create mode 100644 include/soc/fsl/caam-
> blob.h  create mode 100644 security/keys/trusted-keys/Kconfig
>  create mode 100644 security/keys/trusted-keys/trusted_caam.c
> 
> --
> 2.30.2





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