Date: Wed, 2 Jun 2010 13:08:27 +0100
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: "Justin P. Mattock" <justinmattock@gmail.com>, x86@kernel.org,
       tglx@linutronix.de, linux-kernel@vger.kernel.org
Subject: Re: [PATCH]X86:reboot.c Add some dmi entries to
 pci_reboot_dmi_table.
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On Tue, 1 Jun 2010 22:48:20 +0100
Matthew Garrett <mjg59@srcf.ucam.org> wrote:

> On Tue, Jun 01, 2010 at 02:43:12PM -0700, Justin P. Mattock wrote:
> > On 06/01/2010 02:29 PM, Matthew Garrett wrote:
> >> So, just to be clear, you run this as root and it immediately returns
> >> you to the prompt? This seems unlikely.
> >
> > yep.. with the above code
> > I (save to a file) then
> > non-root gcc reboot.c -o reboot
> > then su
> > ./reboot
> > just bake to the command prompt
> 
> Are you running some sort of security policy that might block hardware 
> access?

	Try

	if (iopl(...))
		perror

... (or strace it running as root)
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