Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751150AbdLIGdn (ORCPT ); Sat, 9 Dec 2017 01:33:43 -0500 Received: from out3-smtp.messagingengine.com ([66.111.4.27]:43835 "EHLO out3-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750930AbdLIGdk (ORCPT ); Sat, 9 Dec 2017 01:33:40 -0500 X-ME-Sender: Date: Sat, 9 Dec 2017 17:33:35 +1100 From: "Tobin C. Harding" To: Joe Perches Cc: Dan Carpenter , Laura Abbott , Kees Cook , Jonathan Corbet , Randy Dunlap , Andrew Murray , linux-doc@vger.kernel.org, LKML Subject: Re: [PATCH] doc: convert printk-formats.txt to rst Message-ID: <20171209063335.GD2191@eros> References: <1512524729-16051-1-git-send-email-me@tobin.cc> <20171207234402.GT2191@eros> <20171208004627.GW2191@eros> <1512768157.1845.30.camel@perches.com> <20171209012736.GC2191@eros> <1512785925.26342.4.camel@perches.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1512785925.26342.4.camel@perches.com> X-Mailer: Mutt 1.5.24 (2015-08-30) User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1363 Lines: 38 [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 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.