[Buildroot] [PATCH 1/5] boot/optee-os: OP-TEE secure world

Etienne Carriere etienne.carriere at linaro.org
Fri Nov 23 10:13:56 UTC 2018


On Fri, 23 Nov 2018 at 11:05, Baruch Siach <baruch at tkos.co.il> wrote:
>
> Hi Etienne,
>
> Etienne Carriere writes:
> > On Thu, 22 Nov 2018 at 21:18, Baruch Siach <baruch at tkos.co.il> wrote:
> >> Thanks for your contribution. I have a few comments below.
> >>
> >> Etienne Carriere writes:
> >> > OP-TEE OS is maintained by the OP-TEE project. It provides an
> >> > open source solution for development and integration of secure
> >> > services for Armv7-A and Armv8-A CPU based platforms supporting
> >> > the TrustZone technology. This technology enables CPUs to
> >> > concurrently host a secure world as the OP-TEE OS and a non-secure
> >> > world as a Linux based OS.
> >> >
> >> > The OP-TEE project maintains other packages to leverage OP-TEE on
> >> > Linux kernel based OSes. An OP-TEE interface driver is available
> >> > in the Linux kernel since 4.12 upon CONFIG_OPTEE.
> >> >
> >> > https://www.op-tee.org/
> >> > https://github.com/OP-TEE/optee_os
> >> >
> >> > Signed-off-by: Etienne Carriere <etienne.carriere at linaro.org>
> >>
> >> ...
> >>
> >> > diff --git a/boot/optee-os/Config.in b/boot/optee-os/Config.in
> >> > new file mode 100644
> >> > index 0000000..5968531
> >> > --- /dev/null
> >> > +++ b/boot/optee-os/Config.in
> >> > @@ -0,0 +1,102 @@
> >> > +config BR2_TARGET_OPTEE_OS
> >> > +     bool "optee_os"
> >> > +     depends on BR2_aarch64 || BR2_arm
> >> > +     select BR2_PACKAGE_OPENSSL # host tool
> >>
> >> Which host? Is that the host below which OPTEE OS runs? This is usually
> >> called target in the Buildroot lingo. Please clarify in a comment.
> >
> > I see. Well, it is really the host here: OpenSSL is required to build
> > the OPTEE OS binaries, it is not required in the target.
> > I found such "# host tool" comment in some packages and though it was
> > the shortest explicit way to highlight the deps.
>
> Your 'select' enables the target OpenSSL, which is not what you
> need. You only need to add host-openssl to the _DEPENDENCIES of your
> package. No need to 'select' the host package.
>
> Make sure to test on a host that has no openssl tools installed by the
> distro. Your build test succeeds because your package is actually using
> your distro installed tools. That didn't work for your other dependency
> ...
>
> > By the way, I have a questions on
> > optee-os also requires the Crypto module from python to build the
> > optee-os target binaries.
> > It failed with trace:
> >      File "scripts/pem_to_pub_c.py", line 23, in main
> >        from Crypto.PublicKey import RSA
> >    ImportError: No module named Crypto.PublicKey
> >
> > I tried to resolve this by adding "select BR2_PACKAGE_PYTHON_PYCRYPTO"
> > here but it did not solve the issue.
> > Moreover, I had to also enable some configs to get pycrypto to build:
> >  BR2_PACKAGE_PYTHON=y
> >  BR2_TOOLCHAIN_BUILDROOT_WCHAR=y
> >  BR2_USE_WCHAR=y
> > Finally, i worked around the issue by patching optee-os filetree: port
> > related scripts to python3
> >
> > How do you think should have I done to get Crypto module supported for
> > optee-os build?
>
> Here again BR2_PACKAGE_PYTHON_PYCRYPTO enables the target package, while
> you need the host package. The solutions is the same. Add
> host-python-pycrypto to your _DEPENDENCIES.
>
> >> Is that a build time dependency? If so you need to add openssl to
> >> _DEPENDENCIES.
> >
> > Ok. I understand I need both: BR2_<dep>=y  + add
> > <package>_DEPENDENCIES+= <dep>.
>
> For target package you need both. For host packages you don't need BR2_<dep>.

Ok Baruch,
Thanks a lot for the details.

etienne

>
> >> > +     help
> >> > +       OP-TEE OS provides the secure world boot image and the trust
> >> > +       application development kit of the OP-TEE project. OP-TEE OS
> >> > +       also provides generic trusted application one can embedded
> >> > +       into its system.
> >> > +
> >> > +       http://github.org/OP-TEE/optee_os
> >> > +
> >> > +if BR2_TARGET_OPTEE_OS
> >> > +
> >> > +choice
> >> > +     prompt "OP-TEE OS version"
> >> > +     default BR2_TARGET_OPTEE_OS_LATEST
> >> > +     help
> >> > +       Select the version of OP-TEE OS you want to use
> >>
> >> Is there a practical need to support selection separate version
> >> selection for each OPTEE component? If not then I think this version
> >> selection should apply to all other components.
> >
> > Your absolutely right. I will see how to handle that.
>
> baruch
>
> --
>      http://baruch.siach.name/blog/                  ~. .~   Tk Open Systems
> =}------------------------------------------------ooO--U--Ooo------------{=
>    - baruch at tkos.co.il - tel: +972.52.368.4656, http://www.tkos.co.il -



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