linux-kernel - Re: [RFC,PATCH v2] efi: Add support for a UEFI variable filesystem

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Message-ID: <1346941120.4244.82.camel@mfleming-mobl1.ger.corp.intel.com>
Date:	Thu, 06 Sep 2012 15:18:40 +0100
From:	Matt Fleming <matt.fleming@...el.com>
To:	Jeremy Kerr <jeremy.kerr@...onical.com>
Cc:	linux-kernel@...r.kernel.org, Matthew Garrett <mjg@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Matt Domsch <Matt_Domsch@...l.com>
Subject: Re: [RFC,PATCH v2] efi: Add support for a UEFI variable filesystem

On Thu, 2012-09-06 at 13:40 +0800, Jeremy Kerr wrote:
> From: Matthew Garrett <mjg@...hat.com>
> 
> The existing EFI variables code only supports variables of up to 1024
> bytes. This limitation existed in version 0.99 of the EFI specification,
> but was removed before any full releases. Since variables can now be
> larger than a single page, sysfs isn't the best interface for this. So,
> instead, let's add a filesystem. Variables can be read, written and
> created, with the first 4 bytes of each variable representing its UEFI
> attributes. The create() method doesn't actually commit to flash since
> zero-length variables can't exist per-spec.
> 
> Updates from Jeremy Kerr <jeremy.kerr@...onical.com>.
> 
> Signed-off-by: Matthew Garrett <mjg@...hat.com>
> Signed-off-by: Jeremy Kerr <jeremy.kerr@...onical.com>
> 
> ---
> v2: Add check for < 4-byte writes

Am I correct in thinking that this filesystem doesn't handle deletion of
authenticated variables?

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