linux-kernel - Re: [GIT PULL] x86/efi changes for v3.5

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Message-ID: <1338756027.4584.3.camel@mfleming-mobl1.ger.corp.intel.com>
Date:	Sun, 03 Jun 2012 21:40:27 +0100
From:	Matt Fleming <matt.fleming@...el.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Henrik Rydberg <rydberg@...omail.se>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	Jordan Justen <jordan.l.justen@...el.com>,
	Matthew Garrett <mjg@...hat.com>
Subject: Re: [GIT PULL] x86/efi changes for v3.5

On Sat, 2012-06-02 at 20:13 -0700, H. Peter Anvin wrote:
> On 06/02/2012 11:38 AM, Henrik Rydberg wrote:
> > Hi Ingo, Hans Peter, Matt, Jordan,
> > 
> >> This patchset makes changes to the bzImage EFI header, so that 
> >> it can be signed with a secure boot signature tool. It should 
> >> not affect anyone who is not using the EFI self-boot feature in 
> >> any way.
> > 
> > Commit 2e064b1 (Fix issue of overlapping .reloc section for EFI_STUB)
> > breaks EFI boot on my MacBookAir3,1. The efi firmware no longer
> > recognizes the bzImage and falls back to BIOS emulation boot.
> > 
> > Reverting 2e064b1 works for me, but I am happy to test other options
> > as well.
> > 
> 
> Matt, Jordan,
> 
> Could you look into this please?

Yeah, there's a bug report for this here,

	https://bugzilla.kernel.org/show_bug.cgi?id=43309

I suspect that older firmware doesn't handle a zero .reloc section
properly. So, unfortunately we will have to leave the .reloc section
with a dummy reloc, rather than having one with no entries.

I'll put a patch together.

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