also, root can't attach to pid1 if securelevel is >= 0.
To adjust securelevel this test would need to be modified to run under
rump ... We wouldn't want the test to manipulate securelevel of the
running system.
s/wouldn't want/*can't* by design have/.
i don't know that running under rump is useful here. i certainly
would not trust ptrace tests in a rump to cover it properly. this
test should just be skipped if securelevel >= 0. fact is that
very few systems run with securelevel these days, so it's a small
portion of systems that won't have it.