[Borealid]

The term to search for is "UKI".

A UKI is a kernel+initramfs+boot-arguments bundle all as a single WinPE/UEFI executable using the "EFI Stub Loader".

You configure your system firmware to execute it, passing no arguments. It boots using the command line you set earlier. It's signed, and verified by the platform secure boot.

Hibernation works fine with this approach.

[ekianjo]

> Hibernation works fine with this approach.

Can you explain why it improves the hibernation behavior? I have seen UKI mentioned before but never heard that it improves hibernation.

[heavyset_go]

It doesn't, it's just another bootstrapping method that happens to work fine with hibernation.

UKI allows you to extend your chain of trust from the bootloader to ramdisk, instead of just your bootloader and kernel. From there, you can enable kernel lockdown and checking of module signatures if you want to.

I think you can do the same thing without UKI (I forget tbh), but UKI simplifies it with one UEFI executable that doesn't even need a bootloader.

[fpoling]

Does this mean that the hibernated image must be signed each time the laptop hibernates?

[heavyset_go]

The swap file that memory is dumped to during hibernation is on an encrypted disk. Upon wake, you need to unlock the disk before you can resume from hibernation.