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this post was submitted on 07 Feb 2024
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Say it with me now: LUUUUUKS
LUKS is still vulnerable to this attack if you enable autodecrypt using TPM. This attack is based on the vulnerability that the CPU and TPM communicates uses plain text. And it is a pretty common attack against TPM:
https://dolosgroup.io/blog/2021/7/9/from-stolen-laptop-to-inside-the-company-network
And apparently Linux is not doing too hot on this regard either:
https://www.secura.com/blog/tpm-sniffing-attacks-against-non-bitlocker-targets
However, this attack is not viable for device with firmware based solution, like fTPM, Microsoft Pluton, secure enclave etc. in these case TPM is part of the cpu, hence have no exposed pins to sniff their connection.
So if you don't want people with physical access to your computer (a thief or a evil maiden) to access everything on your disk, don't setup TPM auto decrypt.
I wondered why LUUUUUKS didnt use the TPM, why do i have to put my password in... this is absolutely why.
Edit: fixed spelling of LUUUUUKS
Also yes you can, I wouldn't recommend it though. Maybe in addition to your password though.
Wait until you see Dracut and Tang.
What exactly is the point of full disk encryption if the system auto-unlocks on boot?
Protection against tampering, maybe?
Bad excuse, but that is the logic I've heard.