linux-kernel - Re: [PATCH] ARM: Convert BUG() to use unreachable()

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Message-ID: <20091217193317.GC4440@n2100.arm.linux.org.uk>
Date:	Thu, 17 Dec 2009 19:33:17 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Joe Buck <Joe.Buck@...opsys.COM>
Cc:	Richard Guenther <richard.guenther@...il.com>,
	David Daney <ddaney@...iumnetworks.com>,
	"gcc@....gnu.org" <gcc@....gnu.org>,
	Jamie Lokier <jamie@...reable.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Subject: Re: [PATCH] ARM: Convert BUG() to use unreachable()

On Thu, Dec 17, 2009 at 11:14:01AM -0800, Joe Buck wrote:
> On Thu, Dec 17, 2009 at 11:06:13AM -0800, Russell King - ARM Linux wrote:
> > On Thu, Dec 17, 2009 at 10:35:17AM -0800, Joe Buck wrote:
> > > Besides, didn't I see a whole bunch of kernel security patches related
> > > to null pointer dereferences lately?  If page 0 can be mapped, you
> > > suddenly won't get your trap.
> > 
> > Page 0 can not be mapped on ARM kernels since the late 1990s, and this
> > protection is independent of the generic kernel.
> > 
> > Milage may vary on other architectures, but that's not a concern here.
> 
> I don't understand, though, why you would want to implement a generally
> useful facility (make the kernel trap so you can do a post-mortem
> analysis) in a way that's only safe for the ARM port.

The discussion at hand is about code contained in the ARM supporting
files (arch/arm/kernel/traps.c), rather than the generic kernel.

As such, it is not relevant to any architecture other than ARM.
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