From: Sumit Garg <sumit.garg@linaro.org>
To: Janne Karhunen <janne.karhunen@gmail.com>
Cc: keyrings@vger.kernel.org, linux-integrity@vger.kernel.org,
linux-security-module@vger.kernel.org,
Jens Wiklander <jens.wiklander@linaro.org>,
Jonathan Corbet <corbet@lwn.net>,
dhowells@redhat.com, jejb@linux.ibm.com,
Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
Mimi Zohar <zohar@linux.ibm.com>,
James Morris <jmorris@namei.org>,
"Serge E. Hallyn" <serge@hallyn.com>,
Casey Schaufler <casey@schaufler-ca.com>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Daniel Thompson <daniel.thompson@linaro.org>,
Linux Doc Mailing List <linux-doc@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
"tee-dev @ lists . linaro . org" <tee-dev@lists.linaro.org>
Subject: Re: [RFC v2 0/6] Introduce TEE based Trusted Keys support
Date: Wed, 31 Jul 2019 19:53:08 +0530 [thread overview]
Message-ID: <CAFA6WYOKcOzSwakHhgshZcebD8ZBMSi7xQdjWYFS79=Xc+odOg@mail.gmail.com> (raw)
In-Reply-To: <CAE=Ncrb23q++z8R8UMbjDE2epEq4YVcNGzrRD31eH3JAooYejg@mail.gmail.com>
On Wed, 31 Jul 2019 at 16:33, Janne Karhunen <janne.karhunen@gmail.com> wrote:
>
> On Wed, Jul 31, 2019 at 1:26 PM Sumit Garg <sumit.garg@linaro.org> wrote:
>
> > > Interesting, I wrote something similar and posted it to the lists a while back:
> > > https://github.com/jkrh/linux/commit/d77ea03afedcb5fd42234cd834da8f8a0809f6a6
> > >
> > > Since there are no generic 'TEEs' available,
> >
> > There is already a generic TEE interface driver available in kernel.
> > Have a look here: "Documentation/tee.txt".
>
> I guess my wording was wrong, tried to say that physical TEEs in the
> wild vary massively hardware wise. Generalizing these things is rough.
>
There are already well defined GlobalPlatform Standards to generalize
the TEE interface. One of them is GlobalPlatform TEE Client API [1]
which provides the basis for this TEE interface.
>
> > > I implemented the same
> > > thing as a generic protocol translator. The shared memory binding for
> > > instance already assumes fair amount about the TEE and how that is
> > > physically present in the system. Besides, the help from usage of shm
> > > is pretty limited due to the size of the keydata.
> > >
> >
> > If you look at patch #1 and #2, they add support to register kernel
> > memory buffer (keydata buffer in this case) with TEE to operate on. So
> > there isn't any limitation due to the size of the keydata.
>
> Ah, didn't mean that. Meant that the keydata is typically pretty small
> in size, so there is limited benefit from passing that in via shm if
> that complicates anything.
>
Ah, ok. Do you think of any better approach rather than to use SHM?
[1] https://globalplatform.org/specs-library/tee-client-api-specification/
-Sumit
>
> --
> Janne
next prev parent reply other threads:[~2019-07-31 14:23 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-30 12:23 [RFC v2 0/6] Introduce TEE based Trusted Keys support Sumit Garg
2019-07-30 12:23 ` [RFC v2 1/6] tee: optee: allow kernel pages to register as shm Sumit Garg
2019-07-30 12:23 ` [RFC v2 2/6] tee: enable support to register kernel memory Sumit Garg
2019-08-08 22:26 ` [Tee-dev] " Stuart Yoder
2019-08-09 5:36 ` Sumit Garg
2019-07-30 12:23 ` [RFC v2 3/6] tee: add private login method for kernel clients Sumit Garg
2019-07-30 12:23 ` [RFC v2 4/6] KEYS: trusted: Introduce TEE based Trusted Keys Sumit Garg
2019-07-30 12:23 ` [RFC v2 5/6] doc: keys: Document usage of " Sumit Garg
2019-07-30 12:23 ` [RFC v2 6/6] MAINTAINERS: Add entry for " Sumit Garg
2019-07-31 7:11 ` [RFC v2 0/6] Introduce TEE based Trusted Keys support Janne Karhunen
2019-07-31 10:21 ` Janne Karhunen
2019-07-31 13:58 ` Sumit Garg
2019-08-01 6:21 ` Janne Karhunen
2019-08-01 7:40 ` Sumit Garg
2019-08-01 7:59 ` Janne Karhunen
2019-08-01 10:00 ` Sumit Garg
2019-08-01 10:40 ` Janne Karhunen
2019-07-31 10:26 ` Sumit Garg
2019-07-31 11:02 ` Janne Karhunen
2019-07-31 14:23 ` Sumit Garg [this message]
2019-08-01 6:36 ` Janne Karhunen
2019-08-01 6:50 ` [Tee-dev] " Rouven Czerwinski
2019-08-01 7:30 ` Janne Karhunen
2019-08-01 7:58 ` Sumit Garg
2019-08-01 8:30 ` Janne Karhunen
2019-08-01 10:27 ` Sumit Garg
2019-08-04 20:48 ` Jarkko Sakkinen
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