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Thu, 08 Oct 2026 13:00:31 -0400 (EDT) Message-ID: Subject: Re: [PATCH 11/17] tpm: Add kernel signing key creation with audited provenance From: James Bottomley To: Matthew Garrett , mjg59@srcf.ucam.org Cc: keyrings@vger.kernel.org, linux-integrity@vger.kernel.org, rafael@kernel.org, linux-pm@vger.kernel.org, linux-efi@vger.kernel.org Date: Thu, 08 Oct 2026 19:00:28 +0200 In-Reply-To: <20261008132532.1155166-12-matthewg@nvidia.com> References: <20261008132532.1155166-1-matthewg@nvidia.com> <20261008132532.1155166-12-matthewg@nvidia.com> Autocrypt: addr=James.Bottomley@HansenPartnership.com; keydata=mQENBE58FlABCADPM714lRLxGmba4JFjkocqpj1/6/Cx+IXezcS22azZetzCXDpm2MfNE lecY3qkFjfnoffQiw5rrOO0/oRSATOh8+2fmJ6el7naRbDuh+i8lVESfdlkoqX57H5R8h/UTIp6gn 1mpNlxjQv6QSZbl551zQ1nmkSVRbA5TbEp4br5GZeJ58esmYDCBwxuFTsSsdzbOBNthLcudWpJZHU RfMc0ew24By1nldL9F37AktNcCipKpC2U0NtGlJjYPNSVXrCd1izxKmO7te7BLP+7B4DNj1VRnaf8 X9+VIApCi/l4Kdx+ZR3aLTqSuNsIMmXUJ3T8JRl+ag7kby/KBp+0OpotABEBAAG0N0phbWVzIEJvd HRvbWxleSA8SmFtZXMuQm90dG9tbGV5QEhhbnNlblBhcnRuZXJzaGlwLmNvbT6JAVgEEwEIAEICGw MGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAhkBFiEE1WBuc8i0YnG+rZrfgUrkfCFIVNYFAml2ZBI FCS3GUMIACgkQgUrkfCFIVNZKjQf/deRzlXZClKxTC/Ee2yEPqqS7mm/INUA49KdQQ5oIhSxkUBy0 9J4qjMIo5F8ZFkFTqikBqeL35LKu7O7rn8WETfX8Bxvos3HUsl3jHo34DES4MUFIpoQPgtiLRGwLb K0cVCAArR2u2qj4ABmTRrs1I1kvdjEw6gatOuXtEe/j5O2fvfzTq9GBr0Q3n2IAsFXi4hLlx6VPE8 tyWUZ8BWJKtih3JAeUiXFvASL3McV0rV9RnU0VbjEQEhSE7PMYhWpnDC9AyBb0lXJllQRvC3NSkUB 8KVQgNNxRPss0WE/nBoZ4dFA42jTyzTz8lNylxZoAWV7WJb3QxVg4oCodRVrxxrQhSmFtZXMgQm90 dG9tbGV5IDxqZWpiQGtlcm5lbC5vcmc+iQFVBBMBCAA/AhsDBgsJCAcDAgYVCAIJCgsEFgIDAQIeA QIXgBYhBNVgbnPItGJxvq2a34FK5HwhSFTWBQJgS5mYBQkbNYS9AAoJEIFK5HwhSFTWBpwIAL5Bk3 5FB34U6iHmDzzgdCbxLTs43T/YQyJpcGIvopBvnI/fDY8oSG6Df64/O6B+1R+A8TDp6ZG5ysUWnCC 6GuIaEHemBYkitMPglR6+sGCMQY7O0mlsPvdssvKK1KI9Bno4VU6ogaF2qVzefSqg1Djmf/DcsxWP rI/jdJ8FB5AYR2rjIdDFc+zRdAJuavo1/anyY2wgpFh/3R8IOYAEfWV9nGgYkf9+tA4EIn1sxE0I3 L5oW2N3mbyRrkzuBwO8ztMCwqEPk7moWzhokcZqMXiAIahaZdkashJC+s2X2RZSGCy+g+pvY5NN4B BVG5XwLgVBqbHMTcxE0fbmPqz+q6O0LEphbWVzIEJvdHRvbWxleSA8amVqYkBoYW5zZW5wYXJ0bmV yc2hpcC5jb20+iQFXBBMBCABBFiEE1WBuc8i0YnG+rZrfgUrkfCFIVNYFAmODZ5ACGwMFCRs1hL0F CwkIBwICIgIGFQoJCAsCBBYCAwECHgcCF4AACgkQgUrkfCFIVNZu0Af/TzvL2/NdgAcw9uN3x60H8 jc4QUq14VpxcFEFEMpcj1morkX/G93V+56HBBaXZj+yK8PhxIA/SIz+sU7C/0YvKuvzakP8ZX/7WJ e32SOUtjfr/VTaqjIBzNj6OxLvZpmNbBw7s6DwhhNpHOWqJ/1ml+PtDRDV71IB58yVqQjp1xlNKVl ZppcJ5908EJzsFnRIVjiQiDSKoppqB2BCibBbrWcln7CiWMyOC/cco6SIn6twH+f7+aivJ3xGcOE2 a9gBKF5rNi9TBoX9oyPmshv/TDmnohsVrH7AYXlGYfZTk15SWEiROh1QX8/uD9wl/gcIv5EDUpT/F L2jzOsA5663bw== Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2 Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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 =20 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. Regards, James