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edit: "Immutable" means "all of them are the same", not "unchangeable".
~~You sound confident, but the fact that Fedora is using the term "immutable" makes me wonder if you actually have domain expertise here.~~
~~Immutable means immutable. It would be strange for them to call it that if it actually means "completely irrelevant from a security perspective".~~
~~Unless you provide some evidence to the contrary I'm going to assume you aren't correct.~~
Someone with root can run ostree admin unlock --hotfix to make /usr writable. Someone with root can also delete all restore points.
See the comment by superkret.
While you are correct, any system is compromised if you have root, so isn't that irrelevant at that point?
The original context for the comment chain was:
So no, it's completely relevant.
My comment in the comment chain was:
We could give the op the benefit of the doubt and thinking that they were saying that the attacker inside the container managed to gain root inside the container.
Your comment also contained
Which is what led to the further discussion of root making that not so.
I don't believe that to be the intent of the OP's comment, given their second sentence, but they are welcome to state otherwise. I just don't want them thinking that an immutable distribution gives them some kind of bulletproof security that it doesn't.
Very true. The discussion helped me, as I did think it meant not easily editable.
As root of course you can change the system to be any other type of system (layer packages, rebase, whatever), but I did assume it meant not easily modifiable in it's current state.