linux-kernel - Re: [PATCH] pid: change task

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Message-ID: <20131220140417.GE14884@madcap2.tricolour.ca>
Date:	Fri, 20 Dec 2013 09:04:17 -0500
From:	Richard Guy Briggs <rgb@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	linux-kernel@...r.kernel.org, Oleg Nesterov <oleg@...hat.com>
Subject: Re: [PATCH] pid: change task_struct::pid to read-only

On 13/12/20, Peter Zijlstra wrote:
> On Thu, Dec 19, 2013 at 11:48:26PM -0500, Richard Guy Briggs wrote:
> > On 13/12/17, Peter Zijlstra wrote:
> > > On Mon, Dec 16, 2013 at 04:03:38PM -0500, Richard Guy Briggs wrote:
> > > > task->pid is only ever assigned once (well ok, twice).  For system health and
> > > > secure logging confidence, make it const to make it much more intentional when
> > > > it is being changed.
> > > > ---
> > > > 
> > > > Peter, as you had suggested, does this approach work for you in terms of making
> > > > task_struct::pid a lot more difficult to accidentally change to try to preserve
> > > > its integrity?
> > > 
> > > Yeah, looks good to me.
> > 
> > Ok, who would carry this patch?  You?  AKPM?  Me?
> 
> Andrew seems to be the him who carries PID stuff. I don't think I can make
> a case that its scheduler related.
> 
> > Any opinions about Oleg's macro idea?
> 
> I'm undecided.. on the one hand the macro makes it too easy to change
> const stuff, on the other hand it makes it explicit and easily
> greppable.

My first reaction was it makes it too easy.  Easy, but much more clear
in its intentions.  greppable hadn't occured to me.

I figure the accompanying comment covers intent.

- RGB

--
Richard Guy Briggs <rbriggs@...hat.com>
Senior Software Engineer, Kernel Security, AMER ENG Base Operating Systems, Red Hat
Remote, Ottawa, Canada
Voice: +1.647.777.2635, Internal: (81) 32635, Alt: +1.613.693.0684x3545
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