linux-kernel - Re: [PATCH v2] use %pK for /proc/kallsyms and /proc/modules

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Date:	Fri, 4 Feb 2011 14:21:47 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Kees Cook <kees.cook@...onical.com>
Cc:	linux-kernel@...r.kernel.org, Joe Perches <joe@...ches.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Tejun Heo <tj@...nel.org>, Marcus Meissner <meissner@...e.de>,
	Jason Wessel <jason.wessel@...driver.com>,
	Eugene Teo <eugeneteo@...nel.org>,
	Bjorn Helgaas <bjorn.helgaas@...com>,
	Len Brown <len.brown@...el.com>,
	Changli Gao <xiaosuo@...il.com>,
	Dan Rosenberg <drosenberg@...curity.com>
Subject: Re: [PATCH v2] use %pK for /proc/kallsyms and /proc/modules

On Fri, 4 Feb 2011 14:09:44 -0800
Kees Cook <kees.cook@...onical.com> wrote:

> Hi Andrew,
> 
> On Fri, Feb 04, 2011 at 02:03:51PM -0800, Andrew Morton wrote:
> > kernel/kallsyms.c: In function 's_show':
> > kernel/kallsyms.c:481: warning: format '%p' expects type 'void *', but argument 3 has type 'long unsigned int'
> > kernel/kallsyms.c:484: warning: format '%p' expects type 'void *', but argument 3 has type 'long unsigned int'
> > kernel/module.c: In function 'module_sect_show':
> > kernel/module.c:1171: warning: format '%p' expects type 'void *', but argument 3 has type 'long unsigned int'
> > kernel/module.c:1171: warning: format '%p' expects type 'void *', but argument 3 has type 'long unsigned int'
> > 
> > I'm struggling to see how this could have been compile-time or runtime
> > tested?
> 
> I run-time tested it plenty. The thread contains the various discussions
> about compile-time warnings, so I suspect in the last version, I didn't go
> examine the warnings (since the origin of the other warnings went away).
> 

It's passing `unsigned long kallsym_iter.value' into vsprintf as a
pointer.  Won't vsprintf end up dereferenceing that unsigned long?

> I can send a patch to fix it up to cast everything to (void*) if you want?

No typecasts, please.  Get the types *correct* and they won't be needed.
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