linux-kernel - Re: [PATCH v10 03/20] x86/stackvalidate: Compile-time stack validation

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Message-ID: <20150819100138.GA10504@gmail.com>
Date:	Wed, 19 Aug 2015 12:01:38 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Josh Poimboeuf <jpoimboe@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, Michal Marek <mmarek@...e.cz>,
	Peter Zijlstra <peterz@...radead.org>,
	Andy Lutomirski <luto@...nel.org>,
	Borislav Petkov <bp@...en8.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Pedro Alves <palves@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	Bernd Petrovitsch <bernd@...rovitsch.priv.at>,
	Chris J Arges <chris.j.arges@...onical.com>,
	live-patching@...r.kernel.org
Subject: Re: [PATCH v10 03/20] x86/stackvalidate: Compile-time stack
 validation


* Josh Poimboeuf <jpoimboe@...hat.com> wrote:

> On Sat, Aug 15, 2015 at 12:23:54AM -0700, Andrew Morton wrote:
> > On Thu, 13 Aug 2015 22:10:24 -0500 Josh Poimboeuf <jpoimboe@...hat.com> wrote:
> > 
> > > This adds a CONFIG_STACK_VALIDATION option which enables a host tool
> > > named stackvalidate which runs at compile time.
> > 
> > It would be useful to
> > 
> > - show example output for a typical error site
> > 
> > - describe the consequences of that error (ie: why should we fix
> >   these things?)
> > 
> > - describe what needs to be done to repair these sites.
> > 
> > 
> > IOW, what do we gain from merging all this stuff?
> 
> I attempted to do all that in Documentation/stack-validation.txt which
> is in patch 03/20.  Does it address your concerns?  Here it is:

I think it answers the first and third question, but not the second one:

    - describe the consequences of that error (ie: why should we fix
      these things?)

would be nice to document all that richly.

Thanks,

	Ingo
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