Subj : how many kernels must a penguin compile before they call it stable?

Subj : how many kernels must a penguin compile before they call it stable?
To : Benny Pedersen
From : Maurice Kinal
Date : Fri Jul 28 2023 09:54 pm

Hey Benny!

BP> why do you ask me ? :=)

You're the one that brought it up. Anyhow here is what I've figured out so far as zenbleed relates to the local scene.

----- From https://www.xda-developers.com/zenbleed/
Here's a table that should make it all clear:

┌─────────────────┬────────────────────────────────────┐
│ │Impacted CPUs │
├─────────────────┼────────────────────────────────────┤
│Ryzen 3000 Series│All except APUs (e.g. Ryzen 3 3200G)│
├─────────────────┼────────────────────────────────────┤
│Epyc Rome │All │
├─────────────────┼────────────────────────────────────┤
│Ryzen 4000 Series│All │
├─────────────────┼────────────────────────────────────┤
│Ryzen 5000 Series│Only the 5300U, 5500U, and 5700U │
├─────────────────┼────────────────────────────────────┤
│Ryzen 7000 Series│Only 7020 APUs (e.g. Ryzen 3 7320U) │
└─────────────────┴────────────────────────────────────┘
-----

Note that "AMD Ryzen 7 5800U with Radeon Graphics", which is a zen3 appears to be safe from this particular cpu exploit. Also the "AMD Ryzen Embedded R1505G", which runs EuroPoint, is a zen1 and thus not affected by this particular exploit. However according to lscpu these are the exploits that do exist on that cpu;

Vulnerabilities:
Itlb multihit: Not affected
L1tf: Not affected
Mds: Not affected
Meltdown: Not affected
Mmio stale data: Not affected
Retbleed: Mitigation; untrained return thunk; SMT vulnerable
Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl
Spectre v1: Mitigation; usercopy/swapgs barriers and __user pointer sanitization
Spectre v2: Mitigation; Retpolines, IBPB conditional, STIBP disabled, RSB filling, PBRSB-eIBRS Not affected
Srbds: Not affected
Tsx async abort: Not affected

Currently it appears that none of the deployed AMDs in this neck of the woods suffer from this particular exploit (zenbleed) ... :::knocking on wood:::

Life is good,
Maurice

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