Messages in this thread | | | Date | Tue, 25 Jun 2019 16:03:10 -0400 | From | Sasha Levin <> | Subject | Re: [PATCH v6 2/2] fTPM: add documentation for ftpm driver |
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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.pdf >> + >> +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
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