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this post was submitted on 22 Jul 2024
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I think having an A partition and a B partition (I'm assuming that's how SteamOS works) wouldn't help in this case. If the A partition downloaded the definition file, crashed and failed to reboot; the bootloader could failover to the B partition - which would then download the definition file, crash and fail to reboot. It would have to keep rolling back to a last known good snapshot until the update got withdrawn.
You could have an ephemeral set up that wipes
/varand/etcand recreates them every boot. I don't think these EDR tools would like that very much though.You could potentially block your network by disabling your router or something, so it couldn't download the bad update, but you'd have to know that was a step to prevent it (which most people didn't until it was too late).
Ostree-based systems are handy for replacing the system layer, but configs live (mostly) in userspace, and they persist.
Well at that point, just don't install any kernel mode EDR software at all.
NixOS can be set up for impermanence where all config is recreated every boot and nothing persists besides the nix store. There's helpers for ephemeral home also, so you can have something like TailsOS. I'm sure you could do that with other distros but you'd need absolute discipline to have everything the machine needs provisioned at boot.