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

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Message-ID: <20080602102033.63e4cd18@core>
Date:	Mon, 2 Jun 2008 10:20:33 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	David Newall <davidn@...idnewall.com>
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

On Mon, 02 Jun 2008 18:31:34 +0930
David Newall <davidn@...idnewall.com> wrote:

> 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.

Sorry I mean part of the current session. I was thinking about the
specific case of bash or the ssh->bash setup where the question would be
whether the shell was session leader.

Someone who can dup this needs to instrument it in tty_ioctl really.

Alan
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