tpm: pass an array of tpm_extend_digest structures to tpm_pcr_extend()
authorRoberto Sassu <roberto.sassu@huawei.com>
Wed, 6 Feb 2019 16:24:52 +0000 (17:24 +0100)
committerJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Wed, 13 Feb 2019 07:48:52 +0000 (09:48 +0200)
commit0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400
treef138c11b140ee33541a28bc033e95ed02483216a
parent240730437deb213a58915830884e1a99045624dc
tpm: pass an array of tpm_extend_digest structures to tpm_pcr_extend()

Currently, tpm_pcr_extend() accepts as an input only a SHA1 digest.

This patch replaces the hash parameter of tpm_pcr_extend() with an array of
tpm_digest structures, so that the caller can provide a digest for each PCR
bank currently allocated in the TPM.

tpm_pcr_extend() will not extend banks for which no digest was provided,
as it happened before this patch, but instead it requires that callers
provide the full set of digests. Since the number of digests will always be
chip->nr_allocated_banks, the count parameter has been removed.

Due to the API change, ima_pcr_extend() and pcrlock() have been modified.
Since the number of allocated banks is not known in advance, the memory for
the digests must be dynamically allocated. To avoid performance degradation
and to avoid that a PCR extend is not done due to lack of memory, the array
of tpm_digest structures is allocated by the users of the TPM driver at
initialization time.

Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Mimi Zohar <zohar@linux.ibm.com> (on x86 for TPM 1.2 & PTT TPM 2.0)
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
drivers/char/tpm/tpm-interface.c
drivers/char/tpm/tpm.h
drivers/char/tpm/tpm2-cmd.c
include/linux/tpm.h
security/integrity/ima/ima.h
security/integrity/ima/ima_init.c
security/integrity/ima/ima_queue.c
security/keys/trusted.c