netdev - Re: [RFC][PATCH] ns: Syscalls for better namespace sharing control.

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Date:	Mon, 8 Mar 2010 15:49:45 -0600
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Daniel Lezcano <daniel.lezcano@...e.fr>,
	Pavel Emelyanov <xemul@...allels.com>,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	Linux Netdev List <netdev@...r.kernel.org>,
	containers@...ts.linux-foundation.org,
	Netfilter Development Mailinglist 
	<netfilter-devel@...r.kernel.org>,
	Ben Greear <greearb@...delatech.com>
Subject: Re: [RFC][PATCH] ns: Syscalls for better namespace sharing control.

Quoting Eric W. Biederman (ebiederm@...ssion.com):
> Daniel Lezcano <daniel.lezcano@...e.fr> writes:
> I guess my meaning is I was expecting.
> child = fork();
> if (child == 0) {
> 	execve(...);
> }
> waitpid(child);
> 
> This puts /bin/sh in the container as well.
> 
> I'm not certain about the /proc/self thing I have never encountered that.
> But I guess if your pid is outside of the pid namespace of that instance
> of proc /proc/self will be a broken symlink.
> 
> Eric

Hmm, worse than a broken symlink, will it be a wrong symlink if just
the right pid is created in the container?

-serge
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