linux-kernel - Re: 2.6.25.3: su gets stuck for root

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Message-ID: <4843B6EE.8080104@davidnewall.com>
Date:	Mon, 02 Jun 2008 18:31:34 +0930
From:	David Newall <davidn@...idnewall.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Willy Tarreau <w@....eu>,
	Harald Dunkel <harald.dunkel@...nline.de>,
	Joe Peterson <joe@...rush.com>, linux-kernel@...r.kernel.org,
	Alan Cox <alan@...hat.com>
Subject: Re: 2.6.25.3: su gets stuck for root

Alan Cox wrote:
> Not really. The task would get suspended if it attempted to change the
> tty settings while not being session leader. This is part of the POSIX
> and BSD job control.

I haven't heard about this new restriction, but it begs the observation
that stty, when forked from a shell (the usual case), is never a session
leader.
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