> If a malicious partition is presented to initrd

The fact the initramfs is not signed/verified on any desktop Linux distro means secure boot is completely pointless right now on Linux, and is very dissapointing.

I know Fedora has been musing with shipping prebuilt initrds, but it raises problems with things like Nvidia where you need the driver to be in the initramfs to have a proper boot screen. There's also UKIs that have the kernel + initramfs in the same EFI binary (and thus signed) for booting by secure boot, but they can become too big for the small EFI partition computers ship with.