linux-kernel - Re: [PATCH] Fix EDD3.0 data verification.

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Message-ID: <20110203100403.GV14984@redhat.com>
Date:	Thu, 3 Feb 2011 12:04:03 +0200
From:	Gleb Natapov <gleb@...hat.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org
Subject: Re: [PATCH] Fix EDD3.0 data verification.

On Wed, Feb 02, 2011 at 11:56:55AM -0800, H. Peter Anvin wrote:
> On 02/02/2011 09:59 AM, Gleb Natapov wrote:
> > 
> > Ah I see what length you were referring to params->device_path_info_length.
> > If we will use that then we will get correct checksum for BIOSes that work
> > according to phoenix spec too, but edd_show_interface() and edd_show_host_bus()
> > handle only T13 spec so the information they show can be incorrect. I can
> > change code to check that params->device_path_info_length == 44 in addition
> > to checking csum. What do you think?
> > 
> 
> Yes, you need to check both.
OK.

> 
> This is really a union of two similar-but-not-identical structures
> distinguished by the length field.
> 
Yes, unfortunately phoenix spec lacks some vital information that is
needed to find the device edd entry corresponds too. SCSI target or IDE
channel for instance.
 
--
			Gleb.
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