linux-kernel - Re: [PATCH v7 01/17] integrity: Introduce a Linux keyring called machine

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Message-ID: <1414c90e48f78353f5b1da8718bae2f8390caba1.camel@linux.ibm.com>
Date:   Wed, 17 Nov 2021 08:01:53 -0500
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Eric Snowberg <eric.snowberg@...cle.com>, keyrings@...r.kernel.org,
        linux-integrity@...r.kernel.org, dhowells@...hat.com,
        dwmw2@...radead.org, herbert@...dor.apana.org.au,
        davem@...emloft.net, jarkko@...nel.org, jmorris@...ei.org,
        serge@...lyn.com
Cc:     keescook@...omium.org, torvalds@...ux-foundation.org,
        weiyongjun1@...wei.com, nayna@...ux.ibm.com, ebiggers@...gle.com,
        ardb@...nel.org, nramas@...ux.microsoft.com, lszubowi@...hat.com,
        jason@...c4.com, linux-kernel@...r.kernel.org,
        linux-crypto@...r.kernel.org, linux-efi@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        James.Bottomley@...senPartnership.com, pjones@...hat.com,
        konrad.wilk@...cle.com
Subject: Re: [PATCH v7 01/17] integrity: Introduce a Linux keyring called
 machine

Hi Eric,

On Mon, 2021-11-15 at 19:15 -0500, Eric Snowberg wrote:
> Many UEFI Linux distributions boot using shim.  The UEFI shim provides
> what is called Machine Owner Keys (MOK). Shim uses both the UEFI Secure
> Boot DB and MOK keys to validate the next step in the boot chain.  The
> MOK facility can be used to import user generated keys.  These keys can
> be used to sign an end-users development kernel build.  When Linux
> boots, both UEFI Secure Boot DB and MOK keys get loaded in the Linux
> .platform keyring.

, which can be used to verify kexec'ed kernel images.

> Define a new Linux keyring called machine.  This keyring shall contain just
> MOK CA keys and not the remaining keys in the platform keyring. This new
> machine keyring will be used in follow on patches.  Unlike keys in the
> platform keyring, keys contained in the machine keyring will be trusted
> within the kernel if the end-user has chosen to do so.

 allowing, for example, keys to be loaded onto the trusted IMA keyring.

> 
> Signed-off-by: Eric Snowberg <eric.snowberg@...cle.com>

Thank you for all the work!  Just letting you know I'm slowly making my
through the patch set.  With the previous patch re-organization, we
should be able to test everything up to the introduction of the MOK
variable support.

Reviewed-by: Mimi Zohar <zohar@...ux.ibm.com>