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Description of problem:

Reproduced on VMWare + QEMU+OVMF with Secure Boot enabled.
When shim-64 is latest (shim-x64-15-15.el8_2.x86_64) but grub2-efi-x64 isn't (grub2-efi-x64-2.02-82.el8_2.1.x86_64), the system fails to boot when secure boot is enabled.

From my understanding latest shim is supposed to handle older unpatched grub2 but apparently something is wrong here.


Version-Release number of selected component (if applicable):

shim-x64-15-15.el8_2.x86_64


How reproducible:

Always

Steps to Reproduce:
1. Install UEFI+SecureBoot RHEL8.2
2. Update all
3. Downgrade grub2 to 2.02-82.el8_2.1.x86_64

Actual results:

Verification failed: 0x1A Security Violation

Expected results:

Boot.

This is expected behavior, the CVE-2020-10713 vulnerability response [0] says:

"Red Hat customers using Secure Boot need to update kernel, fwupdate, fwupd,
shim and dbxtool packages containing newly validated keys and certificates.".

Since the goal is to not allow the grub2 builds that contain the vulnerability
to be executed anymore when Secure Boot is enabled.

[0]: https://access.redhat.com/security/vulnerabilities/grub2bootloader