[PATCH v3 0/6] add integrity and security to TPM2 transactions

Jarkko Sakkinen jarkko.sakkinen at linux.intel.com
Mon Mar 12 10:58:27 UTC 2018

On Sat, 2018-03-10 at 14:13 -0800, James Bottomley wrote:
> By now, everybody knows we have a problem with the TPM2_RS_PW easy
> button on TPM2 in that transactions on the TPM bus can be intercepted
> and altered.  The way to fix this is to use real sessions for HMAC
> capabilities to ensure integrity and to use parameter and response
> encryption to ensure confidentiality of the data flowing over the TPM
> bus.
> This patch series is about adding a simple API which can ensure the
> above properties as a layered addition to the existing TPM handling
> code.  This series now includes protections for PCR extend, getting
> random numbers from the TPM and data sealing and unsealing.  It
> therefore eliminates all uses of TPM2_RS_PW in the kernel and adds
> encryption protection to sensitive data flowing into and out of the
> TPM.
> This series is also dependent on additions to the crypto subsystem to
> fix problems in the elliptic curve key handling and add the Cipher
> FeedBack encryption scheme:
> https://marc.info/?l=linux-crypto-vger&m=151994371015475
> In the third version I've added data sealing and unsealing protection,
> apart from one API based problem which means that the way trusted keys
> were protected it's not currently possible to HMAC protect an authority
> that comes with a policy, so the API will have to be extended to fix
> that case
> I've verified this using the test suite in the last patch on a VM
> connected to a tpm2 emulator.  I also instrumented the emulator to make
> sure the sensitive data was properly encrypted.
> James

1. Can I ignore v2 and just review/test this version? I haven't even
   peeked into v2 yet.
2. Do you know in which kernel version will the crypto additions land?

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