How to check if Zenbleed mitigation(chicken bit) is properly set?

notme@lemmy.world to Linux@lemmy.ml – 28 points –

I'm a newb and ran the recommended mitigation code to set a chicken bit on my processor. After running it there was no indication that it worked. Is there a simple way to use rdmsr to check?

https://lock.cmpxchg8b.com/zenbleed.html#solution

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Thanks, it works. That's a bit worrying.

Do you think Ubuntu 22.04 will get the security update soon? I got a microcode update today but i think that's only a fix for server cpus and not desktop cpus.

For anyone having permission problems turn off secure boot in order for this to work.

Microcode fixes the issue as of 3 days ago

I thought that was only for Eypc processors with desktop processor fixes coming later this year. The articles are not very clear with what is fixed when.

I also read that fixes are being released now for the high-end chips, but the desktop fixes will be released significantly later