Notify special task kill using wait* functions

[Valdis Kl=?utf-8?Q?=c4=93?=tnieks]

On Sun, 04 Apr 2021 11:48:37 +0200, John Wood said:

> that exec and the child crashes is mitigated. The only drawback here, as
> point Andi, is that a supervisor respawns some process killed. To avoid
> this situation he suggest to notify to usersapace via wait* that the
> task has been killed by "brute". Then, this supervisor has the chance to
> do what they need (respawn or not).

And how does the kernel know that it's notifying a "real" supervisor process,
and not a process started by the bad guy, who can receive the notification
and decide to respawn?

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