linux-kernel - Re: [PATCH] x86/efi: Map EFI memmap entries in-order at runtime

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Message-ID: <20150916132822.GB9198@nazgul.tnic>
Date:	Wed, 16 Sep 2015 15:28:22 +0200
From:	Borislav Petkov <bp@...e.de>
To:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:	Matt Fleming <matt@...eblueprint.co.uk>, joeyli <jlee@...e.com>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	Matt Fleming <matt.fleming@...el.com>,
	Leif Lindholm <leif.lindholm@...aro.org>,
	Peter Jones <pjones@...hat.com>,
	James Bottomley <JBottomley@...n.com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	"H. Peter Anvin" <hpa@...or.com>, Dave Young <dyoung@...hat.com>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH] x86/efi: Map EFI memmap entries in-order at runtime

On Wed, Sep 16, 2015 at 01:25:06PM +0200, Ard Biesheuvel wrote:
> ... so even if we wanted to, it would be intractible to find each
> cross-section relative reference and do the fixup.

Hmm, maybe we should go and patch EFI code segments and fixup all
relative references after mapping. I mean, if you want something done
right, you better do it yourself. :-\

> No, it seems nobody thought of this when designing the feature.

Not surprised at all, to be honest.

> Several solutions and/or work arounds are currently under discussion.

And requiring for code segments not to refer to each other with relative
offsets and holding that down in the spec post-factum is not possible
anymore...?

 [ I can already imagine what the answer to that question would be though... ]

Thanks.

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
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