Re: [PATCH v1 0/3] KEYS: trusted: Introduce support for NXP CAAM-based trusted keys

Ahmad Fatoum
2021-04-01T17:51:57Z

Hello Richard, Sumit,

On 01.04.21 15:17, Richard Weinberger wrote:
> Sumit,
>
> ----- Ursprüngliche Mail -----
>> Von: "Sumit Garg" <sumit.garg@linaro.org>
>> IIUC, this would require support for multiple trusted keys backends at
>> runtime but currently the trusted keys subsystem only supports a
>> single backend which is selected via kernel module parameter during
>> boot.
>>
>> So the trusted keys framework needs to evolve to support multiple
>> trust sources at runtime but I would like to understand the use-cases
>> first. IMO, selecting the best trust source available on a platform
>> for trusted keys should be a one time operation, so why do we need to
>> have other backends available at runtime as well?
>
> I thought about devices with a TPM-Chip and CAAM.
> IMHO allowing only one backend at the same time is a little over simplified.

It is, but I'd rather leave this until it's actually needed.
What can be done now is adopting a format for the exported keys that would
make this extension seamless in future.

Cheers,
Ahmad

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