summaryrefslogtreecommitdiff
path: root/drivers/char/tpm/tpm2-cmd.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/char/tpm/tpm2-cmd.c')
-rw-r--r--drivers/char/tpm/tpm2-cmd.c91
1 files changed, 49 insertions, 42 deletions
diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index 6fbd42c2a528..10f97e6a576b 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -53,22 +53,6 @@ struct tpm2_pcr_read_out {
u8 digest[TPM_DIGEST_SIZE];
} __packed;
-struct tpm2_null_auth_area {
- __be32 handle;
- __be16 nonce_size;
- u8 attributes;
- __be16 auth_size;
-} __packed;
-
-struct tpm2_pcr_extend_in {
- __be32 pcr_idx;
- __be32 auth_area_size;
- struct tpm2_null_auth_area auth_area;
- __be32 digest_cnt;
- __be16 hash_alg;
- u8 digest[TPM_DIGEST_SIZE];
-} __packed;
-
struct tpm2_get_tpm_pt_in {
__be32 cap_id;
__be32 property_id;
@@ -97,7 +81,6 @@ union tpm2_cmd_params {
struct tpm2_self_test_in selftest_in;
struct tpm2_pcr_read_in pcrread_in;
struct tpm2_pcr_read_out pcrread_out;
- struct tpm2_pcr_extend_in pcrextend_in;
struct tpm2_get_tpm_pt_in get_tpm_pt_in;
struct tpm2_get_tpm_pt_out get_tpm_pt_out;
struct tpm2_get_random_in getrandom_in;
@@ -294,49 +277,71 @@ int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
return rc;
}
-#define TPM2_GET_PCREXTEND_IN_SIZE \
- (sizeof(struct tpm_input_header) + \
- sizeof(struct tpm2_pcr_extend_in))
-
-static const struct tpm_input_header tpm2_pcrextend_header = {
- .tag = cpu_to_be16(TPM2_ST_SESSIONS),
- .length = cpu_to_be32(TPM2_GET_PCREXTEND_IN_SIZE),
- .ordinal = cpu_to_be32(TPM2_CC_PCR_EXTEND)
-};
+struct tpm2_null_auth_area {
+ __be32 handle;
+ __be16 nonce_size;
+ u8 attributes;
+ __be16 auth_size;
+} __packed;
/**
* tpm2_pcr_extend() - extend a PCR value
*
* @chip: TPM chip to use.
* @pcr_idx: index of the PCR.
- * @hash: hash value to use for the extend operation.
+ * @count: number of digests passed.
+ * @digests: list of pcr banks and corresponding digest values to extend.
*
* Return: Same as with tpm_transmit_cmd.
*/
-int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash)
+int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, u32 count,
+ struct tpm2_digest *digests)
{
- struct tpm2_cmd cmd;
+ struct tpm_buf buf;
+ struct tpm2_null_auth_area auth_area;
int rc;
+ int i;
+ int j;
- cmd.header.in = tpm2_pcrextend_header;
- cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
- cmd.params.pcrextend_in.auth_area_size =
- cpu_to_be32(sizeof(struct tpm2_null_auth_area));
- cmd.params.pcrextend_in.auth_area.handle =
- cpu_to_be32(TPM2_RS_PW);
- cmd.params.pcrextend_in.auth_area.nonce_size = 0;
- cmd.params.pcrextend_in.auth_area.attributes = 0;
- cmd.params.pcrextend_in.auth_area.auth_size = 0;
- cmd.params.pcrextend_in.digest_cnt = cpu_to_be32(1);
- cmd.params.pcrextend_in.hash_alg = cpu_to_be16(TPM2_ALG_SHA1);
- memcpy(cmd.params.pcrextend_in.digest, hash, TPM_DIGEST_SIZE);
+ if (count > ARRAY_SIZE(chip->active_banks))
+ return -EINVAL;
- rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0, 0,
+ rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_PCR_EXTEND);
+ if (rc)
+ return rc;
+
+ tpm_buf_append_u32(&buf, pcr_idx);
+
+ auth_area.handle = cpu_to_be32(TPM2_RS_PW);
+ auth_area.nonce_size = 0;
+ auth_area.attributes = 0;
+ auth_area.auth_size = 0;
+
+ tpm_buf_append_u32(&buf, sizeof(struct tpm2_null_auth_area));
+ tpm_buf_append(&buf, (const unsigned char *)&auth_area,
+ sizeof(auth_area));
+ tpm_buf_append_u32(&buf, count);
+
+ for (i = 0; i < count; i++) {
+ for (j = 0; j < ARRAY_SIZE(tpm2_hash_map); j++) {
+ if (digests[i].alg_id != tpm2_hash_map[j].tpm_id)
+ continue;
+ tpm_buf_append_u16(&buf, digests[i].alg_id);
+ tpm_buf_append(&buf, (const unsigned char
+ *)&digests[i].digest,
+ hash_digest_size[tpm2_hash_map[j].crypto_id]);
+ }
+ }
+
+ rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, 0, 0,
"attempting extend a PCR value");
+ tpm_buf_destroy(&buf);
+
return rc;
}
+
#define TPM2_GETRANDOM_IN_SIZE \
(sizeof(struct tpm_input_header) + \
sizeof(struct tpm2_get_random_in))
@@ -1025,6 +1030,8 @@ int tpm2_auto_startup(struct tpm_chip *chip)
}
}
+ rc = tpm2_get_pcr_allocation(chip);
+
out:
if (rc > 0)
rc = -ENODEV;