Re: [PATCH v4 1/1] tpm: add sysfs exports for all banks of PCR registers

[Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>]

On Wed, Aug 19, 2020 at 09:27:33AM -0400, Mimi Zohar wrote:
> On Wed, 2020-08-19 at 09:02 -0300, Jason Gunthorpe wrote:
> > On Tue, Aug 18, 2020 at 02:55:50PM -0400, Mimi Zohar wrote:
> > 
> > > The problem is that there isn't just one single userspace library or
> > > application for reading PCRs.  So now not only is there the kernel
> > > "boot_aggregate" regression testing, but regression testing of the tool
> > > itself to support multiple methods of reading the PCRs.
> > 
> > I was thinking just open code 
> >   open("/dev/tpm")
> >   write(read_pcrs_cmd)
> >   read(read_pcrs_cmd)
> >  
> > It isn't particularly hard to retrive the PCRs, don't really need to
> > depend on a library.
> 
> Ok, do you want to contribute it to ima-evm-utils?  While you're at it,
> do you also have code to parse the TPM 2.0 event log that you could
> contribute?
> 
> Seriously, we shouldn't be (re-)writing code to do this.
> 
> Mimi
> 

I'm puzzled why go the trouble of submitting this to LKML and not use
that time to do the whatever changes ima-evm-utils requires?

/Jarkko