linux-kernel - Re: CONFIG

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Message-ID: <20080123031005.GA16766@Krystal>
Date:	Tue, 22 Jan 2008 22:10:05 -0500
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	"Frank Ch. Eigler" <fche@...hat.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Jon Masters <jcm@...hat.com>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: CONFIG_MARKERS

* Frank Ch. Eigler (fche@...hat.com) wrote:
> 
> Jon Masters <jcm@...hat.com> writes:
> 
> > I notice in module.c:
> >
> > #ifdef CONFIG_MARKERS
> > 	if (!mod->taints)
> > 		marker_update_probe_range(mod->markers,
> > 			mod->markers + mod->num_markers, NULL, NULL);
> > #endif
> >
> > Is this an attempt to not set a marker for proprietary modules? [...]
> 
> I can't seem to find any discussion about this aspect.  If this is the
> intent, it seems misguided to me.  There may instead be a relationship
> to TAINT_FORCED_{RMMOD,MODULE}.  Mathieu?
> 
> - FChE

On my part, its mostly a matter of not crashing the kernel when someone
tries to force modprobe of a proprietary module (where the checksums
doesn't match) on a kernel that supports the markers. Not doing so
causes the markers to try to find the marker-specific information in
struct module which doesn't exist and OOPSes.

Christoph's point of view is rather more drastic than mine : it's not
interesting for the kernel community to help proprietary modules writers,
so it's a good idea not to give them marker support. (I CC'ed him so he
can clarify his position).

Mathieu

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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