linux-kernel - Re: [PATCH 1/2] copy_process: fix CLONE_PARENT && ->exit

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Message-Id: <20090225195424.8BF4EFC3DA@magilla.sf.frob.com>
Date:	Wed, 25 Feb 2009 11:54:24 -0800 (PST)
From:	Roland McGrath <roland@...hat.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Chris Evans <scarybeasts@...il.com>,
	David Howells <dhowells@...hat.com>,
	Don Howard <dhoward@...hat.com>,
	Eugene Teo <eugene@...hat.com>,
	Michael Kerrisk <mtk.manpages@...glemail.com>,
	Tavis Ormandy <taviso@....lonestar.org>,
	Vitaly Mayatskikh <vmayatsk@...hat.com>, stable@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] copy_process: fix CLONE_PARENT && ->exit_signal
	interaction

> The task T has ->exit_signal != SIGCHLD, say, SIGHUP. It does
> clone(CLONE_PARENT), copy_process() sets ->exit_signal = SIGHUP.
> 
> T->parent exits, T is re-parented to /sbin/init, and its ->exit_signal
> is changed to SIGCHLD.

I see.  It's tempting to call this a reason to just use SIGCHLD instead of
current->group_leader->exit_signal.  Of course, this all really begs the
question of who uses the case and what they want.


Thanks,
Roland
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