fTPM TA not opening the context

[Palatrauss00]

Hi, for my master thesis I am working at implementing a fTPM on OPTEE and adding new libraries to it. I have seen the this implementation but it does not work and it is a bit outdated. So, I'm working to adapt the fTPM TA to the latest version of optee .

I am having issues to run the ftpm TA. Running the command ./getRandom, I have received this error

TSS_Dev_Open: Error opening /dev/tpm0 getrandom: failed, rc 000b0008 TSS_RC_NO_CONNECTION - Failure connecting to lower layer
I think the error is inside the loading of the kernel module, because the function ftpm_tee_probe that opens the context seems it is not called. So, I think that the fTPM TA is never run but the kernel module is loaded inside the kernel because I have launched lsmod and the tpm_ftpm_tee is printed. What could be the issue?

[jenswi-linaro]

We're currently working on importing the fTPM TA into OP-TEE, have you seen #7054?

[Palatrauss00]

In these days I've seen what you do. But what is the difference between inserting into optee_os and building as external TA?

Also how can I test that is properly working?

[Palatrauss00]

Another thing, with this implementation I've added also Measured Boot. Where the measures are saved?

[jenswi-linaro]

fTPM does some self-tests when probed by the kernel. More testing or a better understanding of the coverage of the self-tests is desirable, but this is what we have today.

Regarding the measured boot, I don't know. We should add a section about fTPM in the documentation, but we're not there yet.