Linux

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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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Linux and Secure Boot certificate expiration (lwn.net)

submitted 1 week ago by HaraldvonBlauzahn@feddit.org to c/linux@lemmy.ml

53 comments fedilink hide all child comments

Linux users who have Secure Boot enabled on their systems knowingly or unknowingly rely on a key from Microsoft that is set to expire in September. After that point, Microsoft will no longer use that key to sign the shim first-stage UEFI bootloader that is used by Linux distributions to boot the kernel with Secure Boot. But the replacement key, which has been available since 2023, may not be installed on many systems; worse yet, it may require the hardware vendor to issue an update for the system firmware, which may or may not happen. It seems that the vast majority of systems will not be lost in the shuffle, but it may require extra work from distributors and users.

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[–] Max_P@lemmy.max-p.me 7 points 1 week ago

That's the whole point of enrolling your own keys in the firmware. You can even wipe the Microsoft keys if you want. You do that from the firmware setup, or within any OS while secure boot is off (such as sbctl on Linux).

That's a feature that is explicitly part of the spec. The expectation is you password protect the BIOS to make sure unauthorized users can't just wipe your keys. But also most importantly that's all measured by the TPM so the OS knows the boot chain is bad and can bail, and the TPM also won't unwrap BitLocker/LUKS keys either.

Secure boot is to prevent unauthorized tampering of the boot chain. It doesn't enforce that the computer will only ever boot Microsoft-approved software, that's a massive liability for an antitrust lawsuit.