| Message ID | 20180626110619.2362791-5-stefanb@linux.vnet.ibm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Tue, 2018-06-26 at 07:06 -0400, Stefan Berger wrote: > 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> Acked-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> (i.e. LGTM but competence to give a detailed review). /Jarkko -- To unsubscribe from this list: send the line "unsubscribe linux-security-module" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h index 354bb5716ce3..35409461a3f2 100644 --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@ -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 { diff --git a/security/integrity/ima/ima_crypto.c b/security/integrity/ima/ima_crypto.c index 4e085a17124f..88082f35adb2 100644 --- a/security/integrity/ima/ima_crypto.c +++ b/security/integrity/ima/ima_crypto.c @@ -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"); } diff --git a/security/integrity/ima/ima_init.c b/security/integrity/ima/ima_init.c index 29b72cd2502e..1437ed3dbccc 100644 --- a/security/integrity/ima/ima_init.c +++ b/security/integrity/ima/ima_init.c @@ -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) diff --git a/security/integrity/ima/ima_queue.c b/security/integrity/ima/ima_queue.c index 418f35e38015..c6303fa19a49 100644 --- a/security/integrity/ima/ima_queue.c +++ b/security/integrity/ima/ima_queue.c @@ -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;
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> --- security/integrity/ima/ima.h | 1 + security/integrity/ima/ima_crypto.c | 2 +- security/integrity/ima/ima_init.c | 11 ++++------- security/integrity/ima/ima_queue.c | 2 +- 4 files changed, 7 insertions(+), 9 deletions(-)