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KEYS: trusted: correctly initialize digests and fix locking issue

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Commit 0b6cf6b97b ("tpm: pass an array of tpm_extend_digest structures to
tpm_pcr_extend()") modifies tpm_pcr_extend() to accept a digest for each
PCR bank. After modification, tpm_pcr_extend() expects that digests are
passed in the same order as the algorithms set in chip->allocated_banks.

This patch fixes two issues introduced in the last iterations of the patch
set: missing initialization of the TPM algorithm ID in the tpm_digest
structures passed to tpm_pcr_extend() by the trusted key module, and
unreleased locks in the TPM driver due to returning from tpm_pcr_extend()
without calling tpm_put_ops().

Cc: stable@vger.kernel.org
Fixes: 0b6cf6b97b ("tpm: pass an array of tpm_extend_digest structures to tpm_pcr_extend()")
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Suggested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
This commit is contained in:
Roberto Sassu 2019-09-13 20:51:36 +02:00 committed by Jarkko Sakkinen
parent 34cd83bb8a
commit 9f75c82246
2 changed files with 14 additions and 5 deletions
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14
drivers/char/tpm/tpm-interface.c
View File

@ -320,18 +320,22 @@ int tpm_pcr_extend(struct tpm_chip *chip, u32 pcr_idx,
if (!chip)
return -ENODEV;
for (i = 0; i < chip->nr_allocated_banks; i++)
if (digests[i].alg_id != chip->allocated_banks[i].alg_id)
return -EINVAL;
for (i = 0; i < chip->nr_allocated_banks; i++) {
if (digests[i].alg_id != chip->allocated_banks[i].alg_id) {
rc = EINVAL;
goto out;
}
}
if (chip->flags & TPM_CHIP_FLAG_TPM2) {
rc = tpm2_pcr_extend(chip, pcr_idx, digests);
tpm_put_ops(chip);
return rc;
goto out;
}
rc = tpm1_pcr_extend(chip, pcr_idx, digests[0].digest,
"attempting extend a PCR value");
out:
tpm_put_ops(chip);
return rc;
}

5
security/keys/trusted.c
View File

@ -1228,11 +1228,16 @@ hashalg_fail:
static int __init init_digests(void)
{
int i;
digests = kcalloc(chip->nr_allocated_banks, sizeof(*digests),
GFP_KERNEL);
if (!digests)
return -ENOMEM;
for (i = 0; i < chip->nr_allocated_banks; i++)
digests[i].alg_id = chip->allocated_banks[i].alg_id;
return 0;
}