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

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Message-ID: <20081110004131.GA25021@us.ibm.com>
Date:	Sun, 9 Nov 2008 18:41:31 -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.
> 
> Andrew Morton wrote:
> > > +static bool is_select_one(struct tmy_io_buffer *head, const char *data)
> > > +{
> > > +	unsigned int pid;
> > > +	struct domain_info *domain = NULL;
> > > +
> > > +	if (sscanf(data, "pid=%u", &pid) == 1) {
> > 
> > PIDs are no longer system-wide unique, and here we appear to be
> > implementing new userspace ABIs using PIDs.
> > 
> I'm not familiar with virtualized environment.
> 
> 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.

-serge
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