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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).

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PSA: Recent AMD fTPM fixes introduced regressions in stable and LTS kernels that are breaking TPM, presumably for everyone (lemmy.ml)

submitted 1 year ago by hottari@lemmy.ml to c/linux@lemmy.ml

12 comments fedilink hide all child comments

https://bugzilla.kernel.org/show_bug.cgi?id=217804#c41

From 6.4.9 onwards, TPM is broken as is LTS 6.1.46. A step downgrade from these versions restores TPM.

all 14 comments

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[–] BaalInvoker 27 points 1 year ago

This shit again... I moved to LTS kernel exactly because of this bug and now it reached LTS kernel as well...

[–] that_leaflet@lemmy.world 22 points 1 year ago (1 children)

fixes introduced regressions

Software development in a nut shell

[–] doot@social.bug.expert 12 points 1 year ago

I like how it's readable both in present and past tenses hehe

[–] argv_minus_one@beehaw.org 9 points 1 year ago* (last edited 1 year ago)

Good. TPM firmware is a high-value attack surface that, if penetrated, gives the attacker complete and irreversible control over the entire machine. It's also proprietary code and only receives security updates for a small fraction of its service life, so it's most likely riddled with vulnerabilities. It should be disabled, as much as possible, if you at all value the security of your system.

[–] jungleben@infosec.pub 5 points 1 year ago

I've had fTPM issues with the bios because I changed CPUs and lost key attestation. Maybe it's my fault, but the reset process isn't documented anywhere clearly and it's not worth digging up my old CPU to reset the Mobo.

[–] SpaceCadet@sopuli.xyz 4 points 1 year ago (2 children)

What's a good usecase for TPM in Linux?

[–] exi@feddit.de 4 points 1 year ago

You can't trust any full disk encryption without it because only a TPM can verify that your bootloader and initrd are not compromised.

[–] al177@lemmy.sdf.org 2 points 1 year ago

Measured boot.

[–] semperverus@lemmy.world 3 points 1 year ago (1 children)

Is it still broken even if you have TPM completely shut off in UEFI?

[–] planish@sh.itjust.works 1 points 1 year ago

It sound like what's broken is the TPM. So if it is shut off it would be both broken and off, and you might not care about the broken.