[PATCH v9 5/8] KEYS: Introduce link restriction for machine keys

[Eric Snowberg]

> On Jan 9, 2022, at 3:42 PM, Mimi Zohar <zohar at linux.ibm.com> wrote:
> 
> On Wed, 2022-01-05 at 18:50 -0500, Eric Snowberg wrote:
>> Introduce a new link restriction that includes the trusted builtin,
>> secondary and machine keys. The restriction is based on the key to be
>> added being vouched for by a key in any of these three keyrings.
>> 
>> With the introduction of the machine keyring, the end-user may choose to
>> trust Machine Owner Keys (MOK) within the kernel. If they have chosen to
>> trust them, the .machine keyring will contain these keys.  If not, the
>> machine keyring will always be empty.  Update the restriction check to
>> allow the secondary trusted keyring and ima keyring to also trust
>> machine keys.
> 
> As suggested the Kconfig in "[PATCH v9 2/8] integrity: Introduce a
> Linux keyring called machine" only loads the platform keys onto the
> .machine keyring, when
> IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY is not enabled.  The
> last sentence needs to be updated to reflect v9.

I missed that when I dropped IMA support.  I will remove the ima reference in the next
round.  Thanks.