this post was submitted on 21 Feb 2025
28 points (96.7% liked)

No Stupid Questions

37432 readers
1174 users here now

No such thing. Ask away!

!nostupidquestions is a community dedicated to being helpful and answering each others' questions on various topics.

The rules for posting and commenting, besides the rules defined here for lemmy.world, are as follows:

Rules (interactive)


Rule 1- All posts must be legitimate questions. All post titles must include a question.

All posts must be legitimate questions, and all post titles must include a question. Questions that are joke or trolling questions, memes, song lyrics as title, etc. are not allowed here. See Rule 6 for all exceptions.



Rule 2- Your question subject cannot be illegal or NSFW material.

Your question subject cannot be illegal or NSFW material. You will be warned first, banned second.



Rule 3- Do not seek mental, medical and professional help here.

Do not seek mental, medical and professional help here. Breaking this rule will not get you or your post removed, but it will put you at risk, and possibly in danger.



Rule 4- No self promotion or upvote-farming of any kind.

That's it.



Rule 5- No baiting or sealioning or promoting an agenda.

Questions which, instead of being of an innocuous nature, are specifically intended (based on reports and in the opinion of our crack moderation team) to bait users into ideological wars on charged political topics will be removed and the authors warned - or banned - depending on severity.



Rule 6- Regarding META posts and joke questions.

Provided it is about the community itself, you may post non-question posts using the [META] tag on your post title.

On fridays, you are allowed to post meme and troll questions, on the condition that it's in text format only, and conforms with our other rules. These posts MUST include the [NSQ Friday] tag in their title.

If you post a serious question on friday and are looking only for legitimate answers, then please include the [Serious] tag on your post. Irrelevant replies will then be removed by moderators.



Rule 7- You can't intentionally annoy, mock, or harass other members.

If you intentionally annoy, mock, harass, or discriminate against any individual member, you will be removed.

Likewise, if you are a member, sympathiser or a resemblant of a movement that is known to largely hate, mock, discriminate against, and/or want to take lives of a group of people, and you were provably vocal about your hate, then you will be banned on sight.



Rule 8- All comments should try to stay relevant to their parent content.



Rule 9- Reposts from other platforms are not allowed.

Let everyone have their own content.



Rule 10- Majority of bots aren't allowed to participate here.



Credits

Our breathtaking icon was bestowed upon us by @Cevilia!

The greatest banner of all time: by @TheOneWithTheHair!

founded 2 years ago
MODERATORS
 

Like... where does the default windows signing keys come from? Isn't that like hard embedded into the BIOS/UEFI when the hardware is made? If so, how does Linux even use Secure Boot? Does it somehow replace the keys when you install a new OS?

I tried googling, but all I find is just simple pages that doesn't have much detail.

top 2 comments
sorted by: hot top controversial new old
[โ€“] truthfultemporarily@feddit.org 15 points 1 day ago (1 children)

Basically it works by every component validating the next one before loading it.

  • UEFI validates the bootloader
  • Bootloader validates the OS

They do this by checking a cryptographic signature. Specifically, UEFI checks that the bootloader is signed by a certificate that is in turn signed by a certificate authority (CA). You can upload custom CA keys in the UEFI interface.

Per default, every UEFI ships with the Microsoft CA. That does not mean you can only run secureboot with Windows and you absolutely should enable secureboot on every machine you own. Microsoft does sign other signing keys allowing them to be also used with secureboot. For example, every major Linux distro has keys signed by the Microsoft CA and so secureboot works out of the box with those.

Even if you have an OS that does not have a signing key signed by the Microsoft CA, you can upload your own secureboot keys to get around that.

It should be pretty clear at this point that all of this is pointless if you do not set a UEFI password.

[โ€“] IHawkMike@lemmy.world 5 points 1 day ago

This is a good answer.

To add, for Linux kernels, the maintainer use a shim EFI package with the distro's keys (e.g., Canonical's keys for Ubuntu) which loads the maintainer-signed kernel. And Microsoft signs the shim to keep the chain intact.