linux-kernel - Re: [PATCH 2/2] module: Re-enable dynamic debugging for GPL-compatible OOT modules

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Message-ID: <1320068657.6759.107.camel@deadeye>
Date:	Mon, 31 Oct 2011 13:44:17 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Rusty Russell <rusty@...tcorp.com.au>,
	Jason Baron <jbaron@...hat.com>
Cc:	Nick Bowler <nbowler@...iptictech.com>, Greg KH <greg@...ah.com>,
	Dave Jones <davej@...hat.com>,
	Randy Dunlap <rdunlap@...otime.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Debian kernel maintainers <debian-kernel@...ts.debian.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Subject: Re: [PATCH 2/2] module: Re-enable dynamic debugging for
 GPL-compatible OOT modules

On Mon, 2011-10-31 at 12:29 +1030, Rusty Russell wrote:
> On Fri, 28 Oct 2011 04:38:14 +0100, Ben Hutchings <ben@...adent.org.uk> wrote:
> > Dynamic debugging was enabled for GPL-compatible out-of-tree modules
> > until my addition of TAINT_OOT_MODULE.  It should continue to be
> > enabled now.
> 
> Please just remove the test entirely.
> 
> AFAICT there's nothing unique to dynamic debug which means it should
> avoid taint.  If it oopses, we'll learn all about tainting in the oops
> message.

It looks like the dynamic debug facility is not meant to be available to
proprietary modules.

Ben.

> > Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
> > ---
> >  kernel/module.c |    4 ++--
> >  1 files changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/kernel/module.c b/kernel/module.c
> > index dab585e..448fd77 100644
> > --- a/kernel/module.c
> > +++ b/kernel/module.c
> > @@ -2881,7 +2881,7 @@ static struct module *load_module(void __user *umod,
> >  	}
> >  
> >  	/* This has to be done once we're sure module name is unique. */
> > -	if (!mod->taints || mod->taints == (1U<<TAINT_CRAP))
> > +	if (!(mod->taints & ~(1U << TAINT_CRAP | 1U << TAINT_OOT_MODULE)))
> >  		dynamic_debug_setup(info.debug, info.num_debug);
> >  
> >  	/* Find duplicate symbols */
> > @@ -2918,7 +2918,7 @@ static struct module *load_module(void __user *umod,
> >  	module_bug_cleanup(mod);
> >  
> >   ddebug:
> > -	if (!mod->taints || mod->taints == (1U<<TAINT_CRAP))
> > +	if (!(mod->taints & ~(1U << TAINT_CRAP | 1U << TAINT_OOT_MODULE)))
> >  		dynamic_debug_remove(info.debug);
> >   unlock:
> >  	mutex_unlock(&module_mutex);
> > -- 
> > 1.7.7
> > 
> > 
> 

-- 
Ben Hutchings
Computers are not intelligent.	They only think they are.

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