Re: [OS-BUILD PATCHv5 0/2] redhat/kernel.spec: add uki_addons to create UKI kernel cmdline addons

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From: Daniel P. Berrangé on gitlab.com
https://gitlab.com/cki-project/kernel-ark/-/merge_requests/2917#note_1803375698

> I agree, that handling them here is easier. But I doubt that there will only
be a few addons. There are a ton of debug parameters that at some point in
time will be needed. Plus there are bugs that can be worked around by "setting
the right parameter". Furthermore, we need the ability to disable memory
hungry parameters for the kdump kernel. All in all my expectation is that the
number will increase rapidly once UKIs get used more.

We need to be very careful about creating signed addons for debug parameters.
The goal of UKIs is to close the huge SecureBoot security hole in existing
systems where neither the initrd nor cmdline were covered by the SecureBoot
signatures.

With the UKIs now the cmdline is signed, we have a fully trustworthy kernel
environment booted. There are parameters for the kernel that could potentially
undermine the security of the system such that we do NOT want to sign addons
with distro keys.

For adhoc debugging options, I think the expectation is that users would be
able to create and sign addons themselves, using a MOK key they have locally
enrolled with shim, rather than having the distro vendor (Red Hat) signing
them.
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