linux-kernel - Re: [PATCH v4] certs: Add EFI_CERT_X509

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Date:   Wed, 16 Sep 2020 21:09:08 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Eric Snowberg <eric.snowberg@...cle.com>
Cc:     dhowells@...hat.com, dwmw2@...radead.org,
        herbert@...dor.apana.org.au, davem@...emloft.net,
        jmorris@...ei.org, serge@...lyn.com, nayna@...ux.ibm.com,
        zohar@...ux.ibm.com, erichte@...ux.ibm.com, mpe@...erman.id.au,
        keyrings@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-crypto@...r.kernel.org, linux-security-module@...r.kernel.org
Subject: Re: [PATCH v4] certs: Add EFI_CERT_X509_GUID support for dbx entries

On Tue, Sep 15, 2020 at 08:49:27PM -0400, Eric Snowberg wrote:
> The Secure Boot Forbidden Signature Database, dbx, contains a list of now
> revoked signatures and keys previously approved to boot with UEFI Secure
> Boot enabled.  The dbx is capable of containing any number of
> EFI_CERT_X509_SHA256_GUID, EFI_CERT_SHA256_GUID, and EFI_CERT_X509_GUID
> entries.
> 
> Currently when EFI_CERT_X509_GUID are contained in the dbx, the entries are
> skipped.
> 
> Add support for EFI_CERT_X509_GUID dbx entries. When a EFI_CERT_X509_GUID
> is found, it is added as an asymmetrical key to the .blacklist keyring.
> Anytime the .platform keyring is used, the keys in the .blacklist keyring
> are referenced, if a matching key is found, the key will be rejected.
> 
> Signed-off-by: Eric Snowberg <eric.snowberg@...cle.com>

Looks good to me.

Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>

/Jarkko