linux-kernel - Re: [PATCH 03/12] pid: get ppid pid_t of task in init_pid

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Date:	Tue, 3 Sep 2013 14:31:59 -0400
From:	Richard Guy Briggs <rgb@...hat.com>
To:	John Johansen <john.johansen@...onical.com>
Cc:	Oleg Nesterov <oleg@...hat.com>, linux-audit@...hat.com,
	linux-kernel@...r.kernel.org, Eric Paris <eparis@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"Serge E. Hallyn" <serge@...lyn.com>
Subject: Re: [PATCH 03/12] pid: get ppid pid_t of task in init_pid_ns safely

On Fri, Aug 30, 2013 at 01:37:09PM -0700, John Johansen wrote:
> On 08/30/2013 12:56 PM, Richard Guy Briggs wrote:
> > On Tue, Aug 27, 2013 at 07:21:55PM +0200, Oleg Nesterov wrote:
> >> On 08/20, Richard Guy Briggs wrote:
> > Most of the instances are current, but the one called from apparmour is
> > stored.  I've just learned that this is bad and someone else just chimed
> > in that they have a patch to remove it...
> 
> the apparmor case isn't actually stored long term. The stored task will be
> a parameter that was passed into an lsm hook and the buffer that it is
> stored in dies before the hook is done. Its temporarily stored in the
> struct so that it can be passed into the lsm_audit fn, and printed into an
> allocated audit buffer. The text version in the audit buffer is what will
> exist beyond the hook.
> 
> There are three patches, I'll reply them below once I have finished rebasing
> them to apply to the current tree instead of my dev tree.

John, thanks for this context and fix.  That helps simplify things.

- RGB

--
Richard Guy Briggs <rbriggs@...hat.com>
Senior Software Engineer
Kernel Security
AMER ENG Base Operating Systems
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