linux-kernel - Re: Use PCI ROMs from EFI boot services

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Message-ID: <cd3b2e67-92af-494d-ba2d-4179ead6e06b@email.android.com>
Date:	Wed, 05 Dec 2012 20:13:29 -0500
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Yinghai Lu <yinghai@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-efi@...r.kernel.org, mfleming@...el.com, dwmw2@...radead.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: Use PCI ROMs from EFI boot services



"H. Peter Anvin" <hpa@...or.com> wrote:

>And that presumably would be something that cannot be exposed to root?
>If so we may want to use one of the bits in the setup_data type field
>as
>a security flag, perhaps...

Yeah, it needs to be hidden from root - but ideally we'd be passing it to the second kernel if we kexec. Alternative would be for it to be capability bounded to a trusted signed kexec binary if we implement Vivek's IMA-based approach. 

-- 
Matthew Garrett | mjg59@...f.ucam.org
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