linux-kernel - Re: [RFC] fix devpts mount behavior

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Message-ID: <20120124002620.GI23916@ZenIV.linux.org.uk>
Date:	Tue, 24 Jan 2012 00:26:20 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Serge Hallyn <serge.hallyn@...onical.com>,
	Dave Hansen <haveblue@...ibm.com>, sukadev@...ux.vnet.ibm.com,
	Andy Whitcroft <apw@...onical.com>,
	Matt Helsley <matthltc@...ibm.com>,
	linux-kernel@...r.kernel.org, containers@...ts.linux-foundation.org
Subject: Re: [RFC] fix devpts mount behavior

On Mon, Jan 23, 2012 at 04:13:49PM -0800, Linus Torvalds wrote:
> On Mon, Jan 23, 2012 at 4:05 PM, Serge Hallyn
> <serge.hallyn@...onical.com> wrote:
> >
> > I've been playing for the last week with ways to fix this, and in the
> > end I can see two ways.
> 
> How about a third way:
> 
>  - make "newinstance" mandatory (and "-o newinstance" is a no-op) and
> forget about the whole issue.
> 
>  - if you really want to remount the old global one, you have to use a
> bind mount of that original mount instead.
> 
> There may be some subtle reason why the above is totally broken and
> just fundamnetally wouldn't work, and breaks all existing setups, but
> maybe it's worth at least discussing as an option?

Hell knows...  That's certainly what I would have prefered, but I wonder
about existing practices along the lines of "mount it in chroot jail
from inside that jail" (as opposed to mount --bind /dev/pts /jail/dev/pts
while preparing it).

Posted patch is too ugly to live and as for the new kind of namespace...
yuck.  We already have far too many :-/
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