From: Matthew Garrett <mjg59@srcf.ucam.org>
To: James Bottomley <James.Bottomley@hansenpartnership.com>
Cc: Matthew Garrett <matthewg@nvidia.com>,
keyrings@vger.kernel.org, linux-integrity@vger.kernel.org,
rafael@kernel.org, linux-pm@vger.kernel.org,
linux-efi@vger.kernel.org
Subject: Re: [PATCH 11/17] tpm: Add kernel signing key creation with audited provenance
Date: Fri, 9 Oct 2026 01:31:30 -0700 [thread overview]
Message-ID: <asimYsZxxGvPAFiZ@srcf.ucam.org> (raw)
In-Reply-To: <bd131221bca29b5f8ba348adadf1e3930a5b57fe.camel@HansenPartnership.com>
On Thu, Oct 08, 2026 at 07:00:28PM +0200, James Bottomley wrote:
> On Thu, 2026-10-08 at 06:20 -0700, Matthew Garrett wrote:
> > Add tpm2_kernel_key_create(), which creates an ECDSA P-256 signing
> > key for the kernel along with evidence that the kernel, rather than
> > userspace, created it. The key is created with TPM2_CreateLoaded
>
> I don't think you want to do this. TPM2_CreateLoaded was added in spec
> version 1.38. A lot of current TPMs on the market today have spec
> versions lower than this and would reject the command (The spec version
> of the Nuvoton in my Dell XPS-13 is 1.16). Since it's really just a
> shorthand for TPM2_Create followed by TPM2_Load, you can simply do that
> instead, which would save us from a load of complaints about this not
> working.
This is what I get for working to the spec instead of reality. Thanks,
I'll split that up.
next prev parent reply other threads:[~2026-10-09 8:31 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-08 13:20 [RFC] Make hibernation work with lockdown Matthew Garrett
2026-10-08 13:20 ` [PATCH 01/17] tpm: Define a kernel-owned TPM NV index that can't be modified by userland Matthew Garrett
2026-10-08 13:41 ` Matthew Garrett
2026-10-08 16:24 ` Jarkko Sakkinen
2026-10-08 16:23 ` Jarkko Sakkinen
2026-10-09 8:33 ` Matthew Garrett
2026-10-08 17:06 ` Ilias Apalodimas
2026-10-08 13:20 ` [PATCH 02/17] efi: Add a mechanism to modify TPM state depending on kernel security features Matthew Garrett
2026-10-08 16:38 ` Jarkko Sakkinen
2026-10-08 13:20 ` [PATCH 03/17] tpm: Allow tpm2_start_auth_session() to start an audit session Matthew Garrett
2026-10-08 13:20 ` [PATCH 04/17] tpm: Log commands executed in " Matthew Garrett
2026-10-08 13:20 ` [PATCH 05/17] tpm: Add a kernel attestation key and signed audit digest retrieval Matthew Garrett
2026-10-08 16:45 ` James Bottomley
2026-10-09 8:29 ` Matthew Garrett
2026-10-08 13:20 ` [PATCH 06/17] tpm: Use TPM2_NV_ReadPublic to read NV index names Matthew Garrett
2026-10-08 13:20 ` [PATCH 07/17] tpm: Add in-kernel support for reading NV indices Matthew Garrett
2026-10-08 13:20 ` [PATCH 08/17] tpm: Add NV define, undefine and write helpers Matthew Garrett
2026-10-08 13:20 ` [PATCH 09/17] tpm: Provision the kernel NV index at registration Matthew Garrett
2026-10-08 13:20 ` [PATCH 10/17] tpm: Move the bounds-checked response reader to a header Matthew Garrett
2026-10-08 13:20 ` [PATCH 11/17] tpm: Add kernel signing key creation with audited provenance Matthew Garrett
2026-10-08 17:00 ` James Bottomley
2026-10-09 8:31 ` Matthew Garrett [this message]
2026-10-08 13:20 ` [PATCH 12/17] tpm: Add signing with the kernel signing key Matthew Garrett
2026-10-08 13:20 ` [PATCH 13/17] tpm: Add verification of kernel signing key provenance Matthew Garrett
2026-10-08 13:20 ` [PATCH 14/17] PM: hibernate: Add image digest and signature page infrastructure Matthew Garrett
2026-10-08 13:20 ` [PATCH 15/17] PM: hibernate: Sign and verify images with a kernel-generated TPM key Matthew Garrett
2026-10-08 13:20 ` [PATCH 16/17] PM: hibernate: Refuse to verify images with a virtual TPM Matthew Garrett
2026-10-08 13:20 ` [PATCH 17/17] PM: hibernate: Allow hibernation under lockdown with signed images Matthew Garrett
2026-10-08 16:53 ` Jarkko Sakkinen
2026-10-09 8:31 ` Matthew Garrett
2026-10-08 15:56 ` [RFC] Make hibernation work with lockdown Jarkko Sakkinen
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