linux-kernel - [PATCH v3 0/3] Address !chip->auth

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Message-ID: <20240704085708.661142-1-jarkko@kernel.org>
Date: Thu,  4 Jul 2024 11:57:01 +0300
From: Jarkko Sakkinen <jarkko@...nel.org>
To: linux-integrity@...r.kernel.org
Cc: Thorsten Leemhuis <regressions@...mhuis.info>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jarkko Sakkinen <jarkko@...nel.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Mimi Zohar <zohar@...ux.ibm.com>,
	David Howells <dhowells@...hat.com>,
	Paul Moore <paul@...l-moore.com>,
	James Morris <jmorris@...ei.org>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	keyrings@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v3 0/3] Address !chip->auth

Unless tpm2_sessions_init() is called, then chip->auth ends up being a null
pointer, which is ignored by authenticated sessions code. These patches aim
to fully address the bug, and hopefully still make into 6.10-rc7.

Tested on x86-64 with:

- TCG_TPM2_HMAC disabled.
- TCG_TPM2_HMAC enabled.
- TCG_TPM2_HMAC enabled, and "/* rc = tpm2_sessions_init(chip); */".

For drivers that do not initialize with tpm2_chip_bootstrap(), the lack of
auth sessions is reported once per power cycle by:

"tpm tpm0: auth session is not active"

This is expected output for the following drivers:

* tpm_ftpm_tee.c
* tpm_i2c_nuvoton.c
* tpm_ibmvtpm.c
* tpm_tis_i2c_cr50.c
* tpm_vtpm_proxy.c

They need to later on enable auth sessions, if they eager to. This
patch set only fixes any collateral damage of not doing so.

v3
* Address:
  https://lore.kernel.org/linux-integrity/922603265d61011dbb23f18a04525ae973b83ffd.camel@HansenPartnership.com/
* Git: https://git.kernel.org/pub/scm/linux/kernel/git/jarkko/linux-tpmdd.git/log/?h=auth-null-3
* Did a full QA run given the changes in config flag handling.

v2:
* Rebase to commit 8a9c6c40432e ("Merge tag 'io_uring-6.10-20240703' of git://git.kernel.dk/linux").
* Couple of cosmetic fixes.

Jarkko Sakkinen (3):
  tpm: Address !chip->auth in tpm2_*_auth_session()
  tpm: Address !chip->auth in tpm_buf_append_name()
  tpm: Address !chip->auth in tpm_buf_append_hmac_session*()

 drivers/char/tpm/Makefile        |   2 +-
 drivers/char/tpm/tpm2-sessions.c | 415 ++++++++++++++++++-------------
 include/linux/tpm.h              |  74 ++----
 3 files changed, 257 insertions(+), 234 deletions(-)

-- 
2.45.2