[tpm2] Re: tpm2_flushcontext stuck

[Tadeusz Struk <tstruk at gmail.com>]

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On 12/19/21 04:17, Juergen Repp wrote:
> Am 18.12.21 um 20:34 schrieb Han:
>> I probably missed it,  how can I specify to make sure /dev/tpm0 is used, and not /dev/tpmrm0 ?  Is it in some configurations?
>>
> You can use the TPM without resource manager with:
> 
> tpm2_createprimary  -Tdevice:/dev/tpm0 -C o -g sha256 -G ecc -c primary.ctx
> tpm2_getcap handles-transient -Tdevice:/dev/tpm0
> tpm2_flushcontext -Tdevice:/dev/tpm0 0x80000000

The problem is that when /dev/tpm0 is used it just sends a request straight to
the tpm and the tpm responds with a valid error message, which it then passed 
back to tcti. In case of /dev/tpmrm0 the RM tries to first load the none 
existing object 0x80000000 from its cash, but since it cannot find it just
returns an error code -22 (EINVAL) and nothing gets send to the tpm.
The tpm_dev_async_work() handler needs to be modified to handle such error cases
as well. I will send a fix for this.

Thanks,
--
Tadeusz