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. Also get rid of the ima_used_chip variable and use the new ima_tpm_chip variable instead for determining whether to call TPM functions.
Signed-off-by: Stefan Berger <[email protected]> Acked-by: Jarkko Sakkinen <[email protected]> --- security/integrity/ima/ima.h | 2 +- security/integrity/ima/ima_crypto.c | 4 ++-- security/integrity/ima/ima_init.c | 16 +++++----------- security/integrity/ima/ima_queue.c | 4 ++-- 4 files changed, 10 insertions(+), 16 deletions(-) diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h index 354bb5716ce3..2ab1affffa36 100644 --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@ -53,9 +53,9 @@ enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8 }; extern int ima_policy_flag; /* set during initialization */ -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 { diff --git a/security/integrity/ima/ima_crypto.c b/security/integrity/ima/ima_crypto.c index 4e085a17124f..7e7e7e7c250a 100644 --- a/security/integrity/ima/ima_crypto.c +++ b/security/integrity/ima/ima_crypto.c @@ -631,10 +631,10 @@ int ima_calc_buffer_hash(const void *buf, loff_t len, static void __init ima_pcrread(int idx, u8 *pcr) { - if (!ima_used_chip) + if (!ima_tpm_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"); } diff --git a/security/integrity/ima/ima_init.c b/security/integrity/ima/ima_init.c index 29b72cd2502e..faac9ecaa0ae 100644 --- a/security/integrity/ima/ima_init.c +++ b/security/integrity/ima/ima_init.c @@ -26,7 +26,7 @@ /* 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. @@ -64,7 +64,7 @@ static int __init ima_add_boot_aggregate(void) iint->ima_hash->algo = HASH_ALGO_SHA1; iint->ima_hash->length = SHA1_DIGEST_SIZE; - if (ima_used_chip) { + if (ima_tpm_chip) { result = ima_calc_boot_aggregate(&hash.hdr); if (result < 0) { audit_cause = "hashing_error"; @@ -106,17 +106,11 @@ 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; - - if (!ima_used_chip) - pr_info("No TPM chip found, activating TPM-bypass! (rc=%d)\n", - rc); + ima_tpm_chip = tpm_default_chip(); + if (!ima_tpm_chip) + pr_info("No TPM chip found, activating TPM-bypass!\n"); rc = integrity_init_keyring(INTEGRITY_KEYRING_IMA); if (rc) diff --git a/security/integrity/ima/ima_queue.c b/security/integrity/ima/ima_queue.c index 418f35e38015..b186819bd5aa 100644 --- a/security/integrity/ima/ima_queue.c +++ b/security/integrity/ima/ima_queue.c @@ -142,10 +142,10 @@ static int ima_pcr_extend(const u8 *hash, int pcr) { int result = 0; - if (!ima_used_chip) + if (!ima_tpm_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; -- 2.17.1
