lkml.org 
[lkml]   [2018]   [Sep]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v3 12/20] tpm: move pcr extend code to tpm2-cmd.c
Date
Add tpm2_pcr_extend() function to tpm2-cmd.c with signature required
by tpm-interface.c. It wraps the original open code
implementation. The original original tpm2_pcr_extend() function
is renamed and made static, called only from new tpm2_pcr_extend()

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
---
V3: fix commit message
drivers/char/tpm/tpm-interface.c | 24 +++++-------------------
drivers/char/tpm/tpm.h | 3 +--
drivers/char/tpm/tpm1-cmd.c | 1 +
drivers/char/tpm/tpm2-cmd.c | 24 ++++++++++++++++++++++--
4 files changed, 29 insertions(+), 23 deletions(-)

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 3a2eef9e8665..54e2cc592bd9 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -481,31 +481,17 @@ EXPORT_SYMBOL_GPL(tpm_pcr_read);
int tpm_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash)
{
int rc;
- struct tpm2_digest digest_list[ARRAY_SIZE(chip->active_banks)];
- u32 count = 0;
- int i;

chip = tpm_find_get_ops(chip);
if (!chip)
return -ENODEV;

- if (chip->flags & TPM_CHIP_FLAG_TPM2) {
- memset(digest_list, 0, sizeof(digest_list));
-
- for (i = 0; i < ARRAY_SIZE(chip->active_banks) &&
- chip->active_banks[i] != TPM2_ALG_ERROR; i++) {
- digest_list[i].alg_id = chip->active_banks[i];
- memcpy(digest_list[i].digest, hash, TPM_DIGEST_SIZE);
- count++;
- }
-
- rc = tpm2_pcr_extend(chip, pcr_idx, count, digest_list);
- tpm_put_ops(chip);
- return rc;
- }
+ if (chip->flags & TPM_CHIP_FLAG_TPM2)
+ rc = tpm2_pcr_extend(chip, pcr_idx, hash);
+ else
+ rc = tpm1_pcr_extend(chip, pcr_idx, hash,
+ "attempting extend a PCR value");

- rc = tpm1_pcr_extend(chip, pcr_idx, hash,
- "attempting extend a PCR value");
tpm_put_ops(chip);
return rc;
}
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index fa88102a0cab..f0963a0a8acd 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -592,8 +592,7 @@ static inline u32 tpm2_rc_value(u32 rc)

int tpm2_get_timeouts(struct tpm_chip *chip);
int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
-int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, u32 count,
- struct tpm2_digest *digests);
+int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash);
int tpm2_get_random(struct tpm_chip *chip, u8 *dest, size_t max);
void tpm2_flush_context_cmd(struct tpm_chip *chip, u32 handle,
unsigned int flags);
diff --git a/drivers/char/tpm/tpm1-cmd.c b/drivers/char/tpm/tpm1-cmd.c
index f93776621e49..90e5bc1720ad 100644
--- a/drivers/char/tpm/tpm1-cmd.c
+++ b/drivers/char/tpm/tpm1-cmd.c
@@ -466,6 +466,7 @@ int tpm1_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash,

rc = tpm_transmit_cmd(chip, NULL, buf.data, EXTEND_PCR_RESULT_SIZE,
EXTEND_PCR_RESULT_BODY_SIZE, 0, log_msg);
+
tpm_buf_destroy(&buf);
return rc;
}
diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index 333631eab4c7..b0b714309440 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -178,8 +178,8 @@ struct tpm2_null_auth_area {
*
* Return: Same as with tpm_transmit_cmd.
*/
-int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, u32 count,
- struct tpm2_digest *digests)
+static int __tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, u32 count,
+ struct tpm2_digest *digests)
{
struct tpm_buf buf;
struct tpm2_null_auth_area auth_area;
@@ -225,6 +225,26 @@ int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, u32 count,
return rc;
}

+int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash)
+{
+ int rc;
+ struct tpm2_digest digest_list[ARRAY_SIZE(chip->active_banks)];
+ u32 count = 0;
+ unsigned int i;
+
+ memset(digest_list, 0, sizeof(digest_list));
+ for (i = 0; i < ARRAY_SIZE(chip->active_banks); i++) {
+ if (chip->active_banks[i] == TPM2_ALG_ERROR)
+ break;
+ digest_list[i].alg_id = chip->active_banks[i];
+ memcpy(digest_list[i].digest, hash, TPM_DIGEST_SIZE);
+ count++;
+ }
+
+ rc = __tpm2_pcr_extend(chip, pcr_idx, count, digest_list);
+ return rc;
+}
+

struct tpm2_get_random_out {
__be16 size;
--
2.14.4
\
 
 \ /
  Last update: 2018-09-18 11:40    [W:0.128 / U:4.544 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site