linux-kernel - Re: [PATCH] exit: PR_SET_ANCHOR for marking processes as reapers for child processes

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Message-Id: <20100308231104.A513B1191@magilla.sf.frob.com>
Date:	Mon,  8 Mar 2010 15:11:04 -0800 (PST)
From:	Roland McGrath <roland@...hat.com>
To:	Lennart Poettering <mzxreary@...inter.de>
Cc:	Oleg Nesterov <oleg@...hat.com>, linux-kernel@...r.kernel.org,
	Americo Wang <xiyou.wangcong@...il.com>,
	James Morris <jmorris@...ei.org>,
	Kay Sievers <kay.sievers@...y.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Kyle McMartin <kyle@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Michael Kerrisk <mtk.manpages@...glemail.com>
Subject: Re: [PATCH] exit: PR_SET_ANCHOR for marking processes as reapers
 	for child processes

> Uh, no. Actually it's the fact that my sub-init gets the SIGCHLD, which
> I am looking for. The clean ps tree is just a side-effect.

Ok.  In that case, there is a substantial can of worms in considering
compatibility breakages, and especially the various wrinkles of setuid that
could be security issues.  It will take a lot of careful thought to be sure
how we can do this without opening new ways to confuse and abuse a setuid
program.


Thanks,
Roland
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