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    i think that a running kernel does not "require" useful exposure to the outside world Commented Mar 21, 2019 at 23:28
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    Brings to mind the old halted Linux firewall (circa 2002) Commented Mar 22, 2019 at 0:50
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    If you add new code to the kernel, you can do anything. If you can't, it will initialize fine up to the point where it tries to run init (the first user-space process), and that will fail. Commented Mar 22, 2019 at 6:44
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    Define "run"... Commented Mar 22, 2019 at 11:49
  • Read operating system: three easy pieces Commented Mar 22, 2019 at 12:03