On Tue, Jun 25, 2019 at 12:59:02PM -0700, Randy Dunlap wrote:
On 6/25/19 12:52 PM, Sasha Levin wrote:
This patch adds basic documentation to describe the new fTPM driver.
Signed-off-by: Sasha Levin sashal@kernel.org
Documentation/security/tpm/index.rst | 1 + Documentation/security/tpm/tpm_ftpm_tee.rst | 31 +++++++++++++++++++++ 2 files changed, 32 insertions(+) create mode 100644 Documentation/security/tpm/tpm_ftpm_tee.rst
diff --git a/Documentation/security/tpm/index.rst b/Documentation/security/tpm/index.rst index af77a7bbb070..15783668644f 100644 --- a/Documentation/security/tpm/index.rst +++ b/Documentation/security/tpm/index.rst @@ -4,4 +4,5 @@ Trusted Platform Module documentation
.. toctree::
- tpm_ftpm_tee tpm_vtpm_proxy
diff --git a/Documentation/security/tpm/tpm_ftpm_tee.rst b/Documentation/security/tpm/tpm_ftpm_tee.rst new file mode 100644 index 000000000000..29c2f8b5ed10 --- /dev/null +++ b/Documentation/security/tpm/tpm_ftpm_tee.rst @@ -0,0 +1,31 @@ +============================================= +Firmware TPM Driver +=============================================
+| Authors: +| Thirupathaiah Annapureddy thiruan@microsoft.com +| Sasha Levin sashal@kernel.org
+This document describes the firmware Trusted Platform Module (fTPM) +device driver.
+Introduction +============
+This driver is a shim for a firmware implemented in ARM's TrustZone
for firmware+environment. The driver allows programs to interact with the TPM in the same +way the would interact with a hardware TPM.
they
+Design +======
+The driver acts as a thin layer that passes commands to and from a TPM +implemented in firmware. The driver itself doesn't contain much logic and is +used more like a dumb pipe between firmware and kernel/userspace.
+The firmware itself is based on the following paper: +https://www.microsoft.com/en-us/research/wp-content/uploads/2017/06/ftpm1.pd...
+When the driver is loaded it will expose ``/dev/tpmX`` character devices to +userspace which will enable userspace to communicate with the firmware tpm
TPM+through this device.
Oh, that's the same comments that I made on 2019-06-18: https://marc.info/?l=linux-integrity&m=156087157019368&w=2
Appologies Randy, I've missed it. I'll send a new ver in a moment. Thanks!
-- Thanks, Sasha