Red Hat and Fedora engineers are plotting a path to supporting Unified Kernel Images (UKI) with Fedora Linux and for the Fedora 38 release in the spring they are aiming to get their initial enablement in place.
Unified Kernel Images have been championed by the systemd folks for better securing and trusting Linux distributions. Unified kernel images are a combination of the kernel image, initrd, and UEFI stub program all distributed as one.... The initial phase would focus on shipping a UKI as an optional sub-RPM that users can opt into initially, updating kernel install scripts so unified kernels are installed and properly updated, and bootloader support for unified kernel images. Adding systemd-boot support to the installers, better measurement and remote attestation support, and switching Fedora Cloud images to using unified kernels are among the additional goals but of lower priority.
Fedora's wiki includes a detailed description of the change proposal:
The goal is to move away from initrd images being generated on the installed machine. They are generated while building the kernel package instead, then shipped as part of a unified kernel image. A unified kernel image is an all-in-one efi binary containing kernel, initrd, cmdline and signature....
Main motivation for this move is to make the distro more robust and more secure.
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