On Mon, Jul 16, 2018 at 8:08 AM Eric W. Biederman <[email protected]> wrote:
>
> The change for global init is it will now die if init is a member of the
> session or init is using this tty as it's controlling tty.
>
> Semantically killing init with SAK is completely appropriate.
No.
Semtnaitcally killing init is completely wrong. Because it will kill
the whole system.
And I don't mean that in "now init won't spawn new things". I mean
that in "now we don't have a child reaper any more, and the system
will be dead because we'll panic on exit".
So it's not about the controlling tty, it's about fundamental kernel
internal consistency guarantees.
See
write_unlock_irq(&tasklist_lock);
if (unlikely(pid_ns == &init_pid_ns)) {
panic("Attempted to kill init! exitcode=0x%08x\n",
father->signal->group_exit_code ?: father->exit_code);
}
in kernel/exit.c.
Linus
