linux-kernel - Re: [PATCH 11/11] pidns: Support unsharing the pid namespace.

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Date:	Wed, 19 Dec 2012 19:14:00 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Linux Containers <containers@...ts.linux-foundation.org>,
	linux-kernel@...r.kernel.org, Serge Hallyn <serge@...lyn.com>,
	Gao feng <gaofeng@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 11/11] pidns: Support unsharing the pid namespace.

Hi Eric,

oleg@...sign.ru no longer works, so I just noticed these emails.

On 11/16, Eric W. Biederman wrote:
>
> Unsharing of the pid namespace unlike unsharing of other namespaces
> does not take affect immediately.  Instead it affects the children
> created with fork and clone.

I'll try to read this series later, but I am not sure I will ever
understand the code with these patches ;)

So alloc_pid() becomes the only user nsproxy->pid_ns and it is not
necessarily equal to task_active_pid_ns(). It seems to me that this
adds a lot of new corner cases.

Unless I missed something, at least we should not allow CLONE_THREAD
if active_pid_ns != nsproxy->pid_ns. If nothing else, copy_process()
initializes ->child_reaper only if thread_group_leader(child). And
->child_reaper == NULL can obviously lead to crash.

Oleg.

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