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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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Overview: How UEFI Secure Boot Works in Linux (tiffybelle.vivaldi.net)

submitted 1 year ago* (last edited 1 year ago) by [email protected] to c/[email protected]

36 comments fedilink hide all child comments

Been down the rabbit hole lately of UEFI Secure Boot issues, and decided to write an overview of how it works out-of-the-box in the excellent Debian-based Linux Mint LMDE 6.

Have mostly been researching this stuff as I was looking to replace GRUB entirely with systemd-boot on one of my systems. Will likely write a follow-up piece documenting that journey if I think it'd be interesting to some nerds out there.

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[–] [email protected] 19 points 1 year ago* (last edited 1 year ago) (2 children)

Good question! There's a few reasons, I guess:

There's a large element of "because I can" to this, just to explore how stupid the scope of systemd is as a suite.
There's a small practical element. GRUB itself is quite a hefty tool to accommodate all kinds of boot setups, and it works well. If you have a simple boot setup though you could probably shave a couple of seconds off of the boot time just by using the simplified sd-boot and loading the kernel via its EFIStub.
A learning exercise in self-signing EFI binaries, enrolling a MOK (if I use Shim), and setting up scripts to handle updates.

All boils down to my enjoyment of doing weird nerdy things though, ultimately. =)

[–] cdombroski 1 points 1 year ago

Using systemd-boot with the shim is definitely doable, you just have to name the systemd-boot loader as grubx64.efi in the EFI/BOOT directory. After that, you just need to sign any dkms modules with a key imported into MOK and register the hash of systemd-boot with MOK

[–] [email protected] -1 points 1 year ago (1 children)

In the interest of politeness I reserved my initial reaction of absolute horror that this would even be attempted by systemd.

[–] [email protected] 1 points 1 year ago

sysd boot doesn't just sign itself.