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

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Message-ID: <47301C7F.3080705@openvz.org>
Date:	Tue, 06 Nov 2007 10:49:19 +0300
From:	Pavel Emelyanov <xemul@...nvz.org>
To:	Ulrich Drepper <drepper@...hat.com>, Theodore Tso <tytso@....edu>
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

Ulrich Drepper wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> 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.

I think, that Ted's proposal (about the "namespaces compatibility matrix") is 
better. I'd prefer knowing of what can stop working in case I do something
rather that forcedly having my hands off this.

Thanks,
Pavel
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