linux-kernel - Re: What should the default lockdown mode be if the bootloader sentinel triggers sanitization?

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Date:   Mon, 30 Jan 2017 13:50:02 +0000
From:   Matt Fleming <matt@...eblueprint.co.uk>
To:     David Howells <dhowells@...hat.com>
Cc:     Peter Jones <pjones@...hat.com>, mjg59@...f.ucam.org,
        ard.biesheuvel@...aro.org, linux-efi@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org, keyrings@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        "H. Peter Anvin" <hpa@...or.com>, Michael Chang <mchang@...e.com>
Subject: Re: What should the default lockdown mode be if the bootloader
 sentinel triggers sanitization?

On Mon, 30 Jan, at 12:10:29PM, David Howells wrote:
> 
> Matt argues, however, that boot_params->secure_boot should be propagated from
> the bootloader and if the bootloader wants to set it, then we should skip the
> check in efi_main() and go with the bootloader's opinion.  This is something
> we probably want to do with kexec() so that the lockdown state is propagated
> there.
 
Actually what I was arguing for was that if the boot loader wants to
set it and bypass the EFI boot stub, e.g. by going via the legacy
64-bit entry point, startup_64, then we should allow that as well as
setting the flag in the EFI boot stub.