From: Matthew Garrett <mjg59@srcf.ucam.org>
To: Ard Biesheuvel <ardb@kernel.org>
Cc: Daniel Kiper <daniel.kiper@oracle.com>,
Alec Brown <alec.r.brown@oracle.com>,
Kanth Ghatraju <kanth.ghatraju@oracle.com>,
Ross Philipson <ross.philipson@oracle.com>,
"dpsmith@apertussolutions.com" <dpsmith@apertussolutions.com>,
"piotr.krol@3mdeb.com" <piotr.krol@3mdeb.com>,
"krystian.hebel@3mdeb.com" <krystian.hebel@3mdeb.com>,
"persaur@gmail.com" <persaur@gmail.com>,
"Yoder, Stuart" <stuart.yoder@arm.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
"michal.zygowski@3mdeb.com" <michal.zygowski@3mdeb.com>,
James Bottomley <James.Bottomley@hansenpartnership.com>,
"lukasz@hawrylko.pl" <lukasz@hawrylko.pl>,
linux-efi <linux-efi@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
The development of GNU GRUB <grub-devel@gnu.org>,
Kees Cook <keescook@chromium.org>
Subject: Re: Linux DRTM on UEFI platforms
Date: Wed, 30 Mar 2022 08:11:03 +0100 [thread overview]
Message-ID: <20220330071103.GA809@srcf.ucam.org> (raw)
In-Reply-To: <CAMj1kXE-7yPTBgQQKXRnQbdvLMv6D7=CowtQ38PdpPVa3SW-Ag@mail.gmail.com>
On Wed, Mar 30, 2022 at 09:02:18AM +0200, Ard Biesheuvel wrote:
> Wouldn't it be better for the secure launch kernel to boot the EFI
> entrypoint directly? As it happens, I just completed a PoC last week
> for a minimal implementation of EFI (in Rust) that only carries the
> pieces that the EFI stub needs to boot Linux. It is currently just a
> proof of concept that only works on QEMU/arm64, but it should not be
> too hard to adapt it for x86 and for booting a kernel that has already
> been loaded to memory.
The EFI stub carries out a bunch of actions that have meaningful
security impact, and that's material that should be measured. Having the
secure launch kernel execute the stub without awareness of what it does
means it would need to measure the code without measuring the state,
while the goal of DRTM solutions is to measure state rather than the
code.
next prev parent reply other threads:[~2022-03-30 7:11 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-29 17:40 Linux DRTM on UEFI platforms Matthew Garrett
2022-03-30 7:02 ` Ard Biesheuvel
2022-03-30 7:11 ` Matthew Garrett [this message]
2022-03-30 7:12 ` Ard Biesheuvel
2022-03-30 7:18 ` Matthew Garrett
2022-03-30 7:23 ` Ard Biesheuvel
2022-03-30 7:27 ` Matthew Garrett
2022-03-30 7:39 ` Ard Biesheuvel
2022-03-30 12:46 ` James Bottomley
2022-03-31 0:35 ` Daniel P. Smith
2022-03-31 7:13 ` Ard Biesheuvel
2022-03-31 10:59 ` Heinrich Schuchardt
2022-05-19 20:57 ` Daniel P. Smith
2022-05-19 20:57 ` Daniel P. Smith
2022-06-10 16:40 ` Ard Biesheuvel
2022-07-05 18:35 ` Daniel P. Smith
2022-07-06 0:03 ` Brendan Trotter
2022-07-06 0:12 ` Matthew Garrett
2022-07-07 9:46 ` Daniel P. Smith
2022-07-08 3:36 ` Brendan Trotter
2022-07-08 4:56 ` Matthew Garrett
2022-07-22 17:23 ` Daniel P. Smith
2022-07-23 5:15 ` Brendan Trotter
2022-08-09 10:53 ` Daniel P. Smith
2022-08-10 9:07 ` Brendan Trotter
2022-08-10 17:46 ` Matthew Garrett
2022-08-11 9:55 ` Brendan Trotter
2022-08-11 11:34 ` Daniel Kiper
2022-08-11 18:25 ` Matthew Garrett
2022-08-12 3:22 ` Brendan Trotter
2022-08-12 5:54 ` Matthew Garrett
2022-08-05 12:53 ` Ard Biesheuvel
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