Public bug reported:
Hello,
I am embedding custom GPG public key in grub and sign (detached) the
4.15.0-46-generic kernel with GPG private key. The grub is not
validating the kernel. I am getting an error "/vmlinuz-4.15.0-46-generic
has invalid signature".
However this process used to work fine on 4.15.0-45-generic kernel. UEFI
used to verify shim (custom SSL signed) and shim (embedded with SSL
cert) used to verify grub (signed with custom SSL key). Grub would
validate kernel using embeddded custom GPG public key. Kernel would be
signed with custom GPG private key.
Is there any commits that went in grub which broke this feature? Is grub
no more validating kernel with embedded key in it? Does it always uses
UEFI keys to validate kernel? or does it give control to shim to verify
the kernel?
Any inputs on this?
** Affects: grub2 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1820296
Title:
grub is not validating kernel if i embed a GPG public key in grub and
sign kernel with GPG private key
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