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Secure Boot invalid signature

From: gwendal landrein
Subject: Secure Boot invalid signature
Date: Fri, 4 Oct 2019 17:28:19 +0000


I've been working on Secure Boot recently with GNU Grub 2.04.
My kernel is signed with my db key, and I have a detached GPG signature
for it as well. If SB is not enabled, the setup works. With SB, it fails
saying 'invalid signature'. I've been a bit through the code, and it
seems to be that the signature is only verified via the shim protocol.
Am I right ? Or is it possible to boot directly Grub via UEFI with SB,
with GPG signed linux (and db signed if needed) ?


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