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Re: Linux DRTM on UEFI platforms

From: Brendan Trotter
Subject: Re: Linux DRTM on UEFI platforms
Date: Wed, 6 Jul 2022 09:33:23 +0930


On Wed, Jul 6, 2022 at 4:52 AM Daniel P. Smith
<> wrote:
> On 6/10/22 12:40, Ard Biesheuvel wrote:> On Thu, 19 May 2022 at 22:59,
> To help provide clarity, consider the following flows for comparison,
> Normal/existing efi-stub:
>   EFI -> efi-stub -> head_64.S
> Proposed secure launch:
>   EFI -> efi-stub -> dl-handler -> [cpu] -> sl_stub ->head_64.S

For more clarity; the entire point is to ensure that the kernel only
has to trust itself and the CPU/TPM hardware (and does not have to
trust a potentially malicious boot loader)..Any attempt to avoid a
one-off solution for Linux is an attempt to weaken security.

The only correct approach is "efi-stub -> head_64.S -> kernel's own
secure init"; where (on UEFI systems) neither GRUB nor Trenchboot has
a valid reason to exist and should never be installed.



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