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

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Date:	Wed, 2 Feb 2011 19:25:34 +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 09:14:32AM -0800, H. Peter Anvin wrote:
> On 02/02/2011 03:21 AM, Gleb Natapov wrote:
> > Check for nonzero path in edd_has_edd30() has no sense. First, it looks
> > at the wrong memory. Device path starts at offset 30 of the info->params
> > structure which is at offset 8 from the beginning of info structure, but
> > code looks at info + 4 instead. This was correct when code was introduced,
> > but around v2.6.4 three more fields were added to edd_info structure
> > (commit 66b61a5c in history.git). Second, even if it will check correct
> > memory it will always succeed since at offset 30 (params->key) there will
> > be non-zero values otherwise previous check would fail.
> > 
> > The patch replaces this bogus check with one that verifies checksum.
> > 
> > Signed-off-by: Gleb Natapov <gleb@...hat.com>
> 
> This is incorrect; the right thing to do is to use the length byte to
> verify the range that should be checksummed.
> 
According to spec length should be set to 30 on exit.

--
			Gleb.
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