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ima: Use tpm_default_chip() and call TPM functions with a tpm_chip

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Rather than accessing the TPM functions by passing a NULL pointer for
the tpm_chip, which causes a lookup for a suitable chip every time, get a
hold of a tpm_chip and access the TPM functions using it.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.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:
Stefan Berger 2018-06-26 15:09:32 -04:00 committed by Jarkko Sakkinen
parent 58bac8cc30
commit 5c2a640aff
4 changed files with 7 additions and 9 deletions
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1
security/integrity/ima/ima.h
View File

@ -56,6 +56,7 @@ extern int ima_policy_flag;
extern int ima_used_chip;
extern int ima_hash_algo;
extern int ima_appraise;
extern struct tpm_chip *ima_tpm_chip;
/* IMA event related data */
struct ima_event_data {

2
security/integrity/ima/ima_crypto.c
View File

@ -634,7 +634,7 @@ static void __init ima_pcrread(int idx, u8 *pcr)
if (!ima_used_chip)
return;
if (tpm_pcr_read(NULL, idx, pcr) != 0)
if (tpm_pcr_read(ima_tpm_chip, idx, pcr) != 0)
pr_err("Error Communicating to TPM chip\n");
}

11
security/integrity/ima/ima_init.c
View File

@ -27,6 +27,7 @@
/* name for boot aggregate entry */
static const char *boot_aggregate_name = "boot_aggregate";
int ima_used_chip;
struct tpm_chip *ima_tpm_chip;
/* Add the boot aggregate to the IMA measurement list and extend
* the PCR register.
@ -106,17 +107,13 @@ void __init ima_load_x509(void)
int __init ima_init(void)
{
u8 pcr_i[TPM_DIGEST_SIZE];
int rc;
ima_used_chip = 0;
rc = tpm_pcr_read(NULL, 0, pcr_i);
if (rc == 0)
ima_used_chip = 1;
ima_tpm_chip = tpm_default_chip();
ima_used_chip = ima_tpm_chip != NULL;
if (!ima_used_chip)
pr_info("No TPM chip found, activating TPM-bypass! (rc=%d)\n",
rc);
pr_info("No TPM chip found, activating TPM-bypass!\n");
rc = integrity_init_keyring(INTEGRITY_KEYRING_IMA);
if (rc)

2
security/integrity/ima/ima_queue.c
View File

@ -145,7 +145,7 @@ static int ima_pcr_extend(const u8 *hash, int pcr)
if (!ima_used_chip)
return result;
result = tpm_pcr_extend(NULL, pcr, hash);
result = tpm_pcr_extend(ima_tpm_chip, pcr, hash);
if (result != 0)
pr_err("Error Communicating to TPM chip, result: %d\n", result);
return result;