IBM vTPM driver lacks a call to tpm2_sessions_init() and reports:

[ 2.987131] tpm tpm0: tpm2_load_context: failed with a TPM error 0x01C4 [ 2.987140] ima: Error Communicating to TPM chip, result: -14

HMAC encryption code also has a risk of null derefence, given that when uninitialized, chip->auth is a null pointer.

Limit TCG_TPM2_HMAC to known good drivers until these issues have been properly fixed.

Cc: stable@vger.kernel.org # v6.10+ Fixes: d2add27cf2b8 ("tpm: Add NULL primary creation") Reported-by: Stefan Berger stefanb@linux.ibm.com Closes: https://lore.kernel.org/linux-integrity/20240617193408.1234365-1-stefanb@lin... Signed-off-by: Jarkko Sakkinen jarkko@kernel.org --- drivers/char/tpm/Kconfig | 1 + 1 file changed, 1 insertion(+)

diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig index cf0be8a7939d..c310588a5958 100644 --- a/drivers/char/tpm/Kconfig +++ b/drivers/char/tpm/Kconfig @@ -30,6 +30,7 @@ if TCG_TPM config TCG_TPM2_HMAC bool "Use HMAC and encrypted transactions on the TPM bus" default X86_64 + depends on TCG_CRB || TCG_TIS_CORE select CRYPTO_ECDH select CRYPTO_LIB_AESCFB select CRYPTO_LIB_SHA256