linux-kernel - Re: [patch] PID namespace design bug, workaround

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Message-ID: <472BFA4B.9040506@redhat.com>
Date:	Fri, 02 Nov 2007 21:34:19 -0700
From:	Ulrich Drepper <drepper@...hat.com>
To:	Pavel Emelyanov <xemul@...nvz.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Sukadev Bhattiprolu <sukadev@...ibm.com>,
	Serge Hallyn <serue@...ibm.com>
Subject: Re: [patch] PID namespace design bug, workaround

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Pavel Emelyanov wrote:
> Having access to the same IPCs in different pid namespaces won't work.
> Having access to the same filesystem in different IPC namespaces won't work.
> Having access to the same UID namespace in different VFS namespaces won't work.
> Having access to the same <any> namespace in different <many others> namespace
>  wont' work.
> [...]


Then explicitly prevent the cases which cannot work in the clone()
calls.  Yes, giving people rope to shoot themselves is a Unix tradition
but it's so unnecessary in this case and will only cause support
problems for innocent people.

I bet the result will be that if you have a separate PID namespace you
need to enforce every other namespace as well.  There are simply too
many dependencies.

- --
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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