Re: [tpm2] tpm2_nvwrite hanging on 3.X

[Duncan.Palmer at data61.csiro.au]

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The issue results from the change in 937d234 (tpm2_nv(read|write): query tpm
for max buffer size). On my platform, the max buffer size determined by
tpm2_util_nv_max_buffer_size() is 0.

I'll happily hack around this for now, however is this something worth raising
further? I'm using an Intel NUC (model NUC5i7RYH) which has recently gone out
of production, so unless this is very unexpected and likely to impact other
platforms, I'm guessing it's not worth worrying too much about.

Regards,
Dunk


Duncan Palmer
Senior Software Engineer | Autonomous Systems
Data61 | CSIRO


________________________________________
From: tpm2 <tpm2-bounces(a)lists.01.org> on behalf of Duncan.Palmer(a)data61.csiro.au <Duncan.Palmer(a)data61.csiro.au>
Sent: 08 February 2018 21:46
To: tpm2(a)lists.01.org
Subject: [ExternalEmail] Re: [tpm2] tpm2_nvwrite hanging on 3.X

I get the same behaviour on master., tho it builds without issues.

Duncan Palmer
Senior Software Engineer | Autonomous Systems
Data61 | CSIRO
E duncan.palmer(a)csiro.au
Queensland Centre for Advanced Technologies (QCAT),
1 Technology Court, Pullenvale QLD, 4069
www.data61.csiro.au

CSIRO’s Digital Productivity business unit and NICTA have joined forces to create digital powerhouse Data61

________________________________________
From: tpm2 <tpm2-bounces(a)lists.01.org> on behalf of Duncan.Palmer(a)data61.csiro.au <Duncan.Palmer(a)data61.csiro.au>
Sent: 08 February 2018 16:32
To: tpm2(a)lists.01.org
Subject: [ExternalEmail] [tpm2] tpm2_nvwrite hanging on 3.X

Hi,

I've come back to something I stopped work on early last November. I was working with the tpm2_tools master branch at the time, and have moved to 3.X to get support for PCR based authorisation with tpm2_nvread/write. With 3.X, tpm2_nvwrite is hanging when trying to write to the tpm device file. Using the code from last year (sorry, I no longer have a record of what revision this was), it was working fine (see log snippet below).

I'm using the 1.x branch of tpm2-tss, and I configure tpm2-tools with '--with-tcti-device --without-tcti-socket'. I've also had to modify Makefile.am to get this combination to build;


--LIBMARSHAL_CFLAGS = \
--    -DALG_ECMQV=1
++#LIBMARSHAL_CFLAGS = \
++#    -DALG_ECMQV=1


Can anyone comment on this? Should I raise a bug on your tracker?


Regards,
Duncan


tpm2_nvwrite logs from my testing last year;

root(a)tpm:/home/foo/install/bin# ./tpm2_nvdefine -x 0x1500016 -a 0x40000001 -s 32 -t 0x2000A
root(a)tpm:/home/foo/install/bin# ./tpm2_nvlist
1 NV indexes defined.

  0. NV Index: 0x1500016
  {
    Hash algorithm(nameAlg):11
     attributes: ownerwrite|policywrite|ownerread(0xA000200)
     The size of the data area(dataSize):32
     Authorization Policy for R/W/D:
  }

root(a)tpm:/home/foo/install/bin# echo 'foo' > nv.dat
root(a)tpm:/home/foo/install/bin# ./tpm2_nvwrite -x 0x1500016 -a 0x40000001 nv.dat
66 6f 6f 0a

root(a)tpm:/home/foo/install/bin# ./tpm2_nvread -x 0x1500016 -a 0x40000001
000000: 66 6f 6f 0a 00 00 00 00 00 00 00 00 00 00 00 00  foo.............
000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................




 Duncan Palmer
 Senior Software Engineer | Autonomous Systems
 Data61 | CSIRO
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