linux-kernel - Re: [TOMOYO #12 (2.6.28-rc2-mm1) 06/11] Common functions for TOMOYOLinux.

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Date:	Sun, 9 Nov 2008 20:52:45 -0600
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:	akpm@...ux-foundation.org, linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org, takedakn@...data.co.jp,
	haradats@...data.co.jp
Subject: Re: [TOMOYO #12 (2.6.28-rc2-mm1) 06/11] Common functions for
	TOMOYOLinux.

Quoting Tetsuo Handa (penguin-kernel@...ove.sakura.ne.jp):
> Hello.
> 
> Serge E. Hallyn wrote:
> > > There are two PIDs, PID seen from inside virtualized environment and
> > > PID seen from outside virtualized environment. To clarify, let me call
> > > the former "PIDv" and the latter "PIDg".
> > > 
> > > PIDv is not system-wide unique. But PIDg is system-wide unique, aren't they?
> > > The PID received from outside virtualized environment is PIDg and they are
> > > system-wide unique, am I right?
> > 
> > You are doing find_task_by_vpid(), so you are not looking up a task by
> > global pid.
> > 
> I need to clarify reachability of "struct task_struct".
> 
> A process inside a virtualized environment cannot reach "struct task_struct"
> which belongs to outside the virtualized environment.
> 
> A process outside virtualized environments can reach "struct task_struct"
> which belongs to inside virtualized environments, can't it?

To be precise, there isn't a real 'inside' and 'outside' virtualized
environements.  Rather pid namespaces are hierarchical.

(Taking another look) it looks like In is_select_one() you're doing the
right thing - you look up the domain of a task based on
find_task_by_vpid() on a passed-in pid.  Seems correct.

thanks,
-serge
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