[PATCH 0/5] Extend struct tpm_buf to support sized buffers (TPM2B)

[Jarkko Sakkinen]

This patch set implements my ideas on how to extend struct tpm_buf to
support TPM2 sized buffers (TPM2B). See Section 10.4 in TPM2 Structures
specification for more information.

The goal is to do initial groundwork for smoother landing of integrity
protection patches by James Bottomley.

I tested the patch set with:

https://github.com/jarkkojs/buildroot-tpmdd/tree/linux-6.5.y

Compilation:

make qemu_x86_64_defconfig
make 2>&1 | tee build.txt;

TPM1 startup: output/images/start-qemu.sh --use-system-swtpm --rtc --tpm1
TPM2 startup: output/images/start-qemu.sh --use-system-swtpm --rtc

For TPM2 I executed the following as the smoke test for these patches:

/usr/lib/kselftests/run_kselftest.sh
tpm2_createprimary --hierarchy o -G rsa2048 -c key.ctxt
tpm2_evictcontrol -c key.ctxt 0x81000001
keyctl add trusted kmk "new 32 keyhandle=0x81000001" @u
keyctl add encrypted 1000100010001000 "new ecryptfs trusted:kmk 64" @u

For TPM1 I tried:

keyctl add trusted kmk "new 32" @u

This caused TPM error 18, which AFAIK means that there is not SRK (?),
which is probably an issue in my swtpm configuration, which is visible
in board/qemu/start-qemu.sh.in.

Link: https://lore.kernel.org/linux-integrity/CT5OE5VZA7D7.3B7C6CK27JIK1@suppilovahvero/
Link: https://lore.kernel.org/linux-integrity/20230403214003.32093-1-James.Bottomley@HansenPartnership.com/
Cc: James Bottomley <James.Bottomley at HansenPartnership.com>
Cc: William Roberts <bill.c.roberts at gmail.com> 
Cc: Stefan Berger <stefanb at linux.ibm.com>
Cc: David Howells <dhowells at redhat.com>
Cc: Jason Gunthorpe <jgg at ziepe.ca>
Cc: Mimi Zohar <zohar at linux.ibm.com>

James Bottomley (1):
  tpm: Move buffer handling from static inlines to real functions

Jarkko Sakkinen (4):
  tpm: Store TPM buffer length
  tpm: Detach tpm_buf_reset() from tpm_buf_init()
  tpm: Support TPM2 sized buffers (TPM2B)
  KEYS: trusted: tpm2: Use struct tpm_buf for sized buffers

 drivers/char/tpm/Makefile                 |   1 +
 drivers/char/tpm/tpm-buf.c                | 126 ++++++++++++++++++++++
 drivers/char/tpm/tpm-interface.c          |  18 +++-
 drivers/char/tpm/tpm-sysfs.c              |   3 +-
 drivers/char/tpm/tpm1-cmd.c               |  26 +++--
 drivers/char/tpm/tpm2-cmd.c               |  36 +++++--
 drivers/char/tpm/tpm2-space.c             |   7 +-
 drivers/char/tpm/tpm_vtpm_proxy.c         |  13 +--
 include/linux/tpm.h                       |  93 +++-------------
 security/keys/trusted-keys/trusted_tpm1.c |  12 +--
 security/keys/trusted-keys/trusted_tpm2.c |  51 +++++----
 11 files changed, 249 insertions(+), 137 deletions(-)
 create mode 100644 drivers/char/tpm/tpm-buf.c

-- 
2.39.2