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List:       linux-integrity
Subject:    Re: TPM 2.0 Linux sysfs interface
From:       Tadeusz Struk <tadeusz.struk () intel ! com>
Date:       2019-08-30 21:20:54
Message-ID: f7e1f25a-8b2d-1e0e-e784-0908161c3c99 () intel ! com
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On 8/28/19 9:15 AM, Jason Gunthorpe wrote:
>>> So exposing PCRs and things through sysfs is not going to happen.
>>>
>>> If you had some very narrowly defined things like version, then
>>> *maybe* but I think a well defined use case is needed for why this
>>> needs to be sysfs and can't be done in C as Jarkko explained.
>> Piotr's request for a sysfs file to differentiate between TPM 1.2 and
>> TPM 2.0 is a reasonable request and probably could be implemented on
>> TPM registration.
>>
>> If exposing the PCRs through sysfs is not acceptable, then perhaps
>> suggest an alternative.
> Use the char dev, this is exactly what is is for.

What about a new /proc entry?
Currently there are /proc/cpuinfo, /proc/meminfo, /proc/slabinfo...
What about adding a new /proc/tpminfo that would print info like
version, number of enabled PCR banks, physical interface [tis|crb],
vendor, etc.

Thanks,
-- 
Tadeusz
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