linux-kernel - Re: + prctl-add-pr_setget_child_reaper-to-allow-simple-process-supervision .patch added to -mm tree

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Date:	Mon, 22 Aug 2011 13:14:02 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	Lennart Poettering <mzxreary@...inter.de>,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-man@...r.kernel.org, roland@...k.frob.com,
	torvalds@...ux-foundation.org
Subject: Re: +
	prctl-add-pr_setget_child_reaper-to-allow-simple-process-supervision
	.patch added to -mm tree

On 08/21, Kay Sievers wrote:
>
> version 5:
> - add back check for &init_task

Reviewed-by: Oleg Nesterov <oleg@...hat.com>





Just one note, to avoid the "doesn't look correct" questions.

> @@ -987,6 +987,9 @@ static int copy_signal(unsigned long clo
>  	sig->oom_score_adj = current->signal->oom_score_adj;
>  	sig->oom_score_adj_min = current->signal->oom_score_adj_min;
>
> +	sig->has_child_subreaper = current->signal->has_child_subreaper ||
> +				   current->signal->is_child_subreaper;

This assumes that current == parent. But this is not true with
CLONE_PARENT. If a task does prctl(REAPER) + clone(CLONE_PARENT)
->has_child_subreaper == T is not exactly right.

But I think this is fine and we do not care, a "wrong"
->has_child_subreaper is harmless and it can't be 100% correct in
any case.

I believe the patch is correct.

Oleg.

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