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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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ELI5 what is the difference between UEFI handles passed to grub by a proprietary bootloader versus coreboot? (lemmy.world)

submitted 1 year ago by [email protected] to c/[email protected]

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What are the broader implications when it comes to access, security, vulnerabilities, etc?

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[–] [email protected] 5 points 1 year ago

I’m not sure I completely understand the question.

But vendor / custom UEFI implementations could obviously pass around whatever structures they want.

The EFI RUNTIME services - for example - could expose custom functions in a proprietary UEFI implementation. Though in my experience this usually is not the case.

Grub should run as an EFI bootloader binary after core UEFI is done. Afaik there is no particular ring / exception level required here. It could vary depending on UEFI implantation.

on android arm32/64 devices I obviously don’t see grub, but core EFI handles and services are not modified much. If anything it’s just expanded to support the next bootloader stage and handle stuff like key combos to select next boot image