linux-kernel - Re: [PATCH] doc: convert printk-formats.txt to rst

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Message-ID: <20171209063335.GD2191@eros>
Date:   Sat, 9 Dec 2017 17:33:35 +1100
From:   "Tobin C. Harding" <me@...in.cc>
To:     Joe Perches <joe@...ches.com>
Cc:     Dan Carpenter <error27@...il.com>,
        Laura Abbott <labbott@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Jonathan Corbet <corbet@....net>,
        Randy Dunlap <rdunlap@...radead.org>,
        Andrew Murray <amurray@...-data.co.uk>,
        linux-doc@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] doc: convert printk-formats.txt to rst

[Adding Laura]

On Fri, Dec 08, 2017 at 06:18:45PM -0800, Joe Perches wrote:
> On Sat, 2017-12-09 at 12:27 +1100, Tobin C. Harding wrote:
> > On Fri, Dec 08, 2017 at 01:22:37PM -0800, Joe Perches wrote:
> 
> > > Outside of the documentation, what could be useful is for
> > > someone to add a tool to verify %p<foo> extension to
> > > the typeof address actually passed as an argument.
> > 
> > This sounds interesting to work no. At first glance I have no idea how
> > one would go about this. Some form of static analysis would be a good
> > place to start, right? I'd like to allocate some cycles to this, any
> > pointers most appreciated.
> 
> A gcc-plugin would likely work best.

What's the learning curve like in your opinion to do a gcc-plugin. I
recall reading someplace 'deep understanding of how the compiler works'
or some such thing. I suppose reading the Dragon book would be a good
place to start?

We could also catch pointers being cast to longs and printed with %x
(and %u) or so I would guess.

> There was some discussion about such a thing here:
> http://www.openwall.com/lists/kernel-hardening/2017/02/14/38

Did you make much progress with this Laura?

> I vaguely recall someone else doing a broader use tool
> which I believe was not smatch, but my google-fu isn't
> finding it.
> 
> It might have been coccinelle based.

thanks,
Tobin.