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The keys are stripped out if you put it into the required unlock mode.

That would be a good thing, given what those features are usually used for (DRM and other user-hostility).

I would love ability to redefine call/ret to profile an app without compiler generate diff code.

Can’t you do that through ebpf?

My understand of ebpf can hook into the function calls in linux kernel.

Can one do that on user space app?

Yes, that is my understanding.

This is what I'm interested in since they pushed that so heavily.