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Subject[PATCH v3 18/20] tpm: use u32 instead of int for pcr index
Date
TPM pcr indices cannot be negative, also the tpm
commands accept u32 number as a pcr index.

1. Adjust the API to use u32 instead of int in all pcr related
functions.
2. Rename tpm1_pcr_read_dev to tpm1_pcr_read() to match
the counterpart tpm2_pcr_read()
3. Remove redundant constants in tpm1_pcr_extend() function.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
---
V3: new in the series
drivers/char/tpm/tpm-interface.c | 4 ++--
drivers/char/tpm/tpm-sysfs.c | 4 ++--
drivers/char/tpm/tpm.h | 10 +++++-----
drivers/char/tpm/tpm1-cmd.c | 14 ++++++--------
drivers/char/tpm/tpm2-cmd.c | 6 +++---
include/linux/tpm.h | 2 +-
security/integrity/ima/ima_crypto.c | 5 +++--
7 files changed, 22 insertions(+), 23 deletions(-)

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index e3206874be22..0eea784e1ae4 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -444,7 +444,7 @@ EXPORT_SYMBOL_GPL(tpm_is_tpm2);
*
* Return: same as with tpm_transmit_cmd()
*/
-int tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
+int tpm_pcr_read(struct tpm_chip *chip, u32 pcr_idx, u8 *res_buf)
{
int rc;

@@ -455,7 +455,7 @@ int tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
if (chip->flags & TPM_CHIP_FLAG_TPM2)
rc = tpm2_pcr_read(chip, pcr_idx, res_buf);
else
- rc = tpm1_pcr_read_dev(chip, pcr_idx, res_buf);
+ rc = tpm1_pcr_read(chip, pcr_idx, res_buf);

tpm_put_ops(chip);
return rc;
diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c
index 861acafd8f29..b88e08ec2c59 100644
--- a/drivers/char/tpm/tpm-sysfs.c
+++ b/drivers/char/tpm/tpm-sysfs.c
@@ -102,7 +102,7 @@ static ssize_t pcrs_show(struct device *dev, struct device_attribute *attr,
cap_t cap;
u8 digest[TPM_DIGEST_SIZE];
ssize_t rc;
- int i, j, num_pcrs;
+ u32 i, j, num_pcrs;
char *str = buf;
struct tpm_chip *chip = to_tpm_chip(dev);

@@ -114,7 +114,7 @@ static ssize_t pcrs_show(struct device *dev, struct device_attribute *attr,

num_pcrs = be32_to_cpu(cap.num_pcrs);
for (i = 0; i < num_pcrs; i++) {
- rc = tpm1_pcr_read_dev(chip, i, digest);
+ rc = tpm1_pcr_read(chip, i, digest);
if (rc)
break;
str += sprintf(str, "PCR-%02d: ", i);
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index d0402aa122ec..dbbfb7118c31 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -518,14 +518,14 @@ ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_space *space,
int tpm_get_timeouts(struct tpm_chip *);
int tpm_auto_startup(struct tpm_chip *chip);

-int tpm1_pm_suspend(struct tpm_chip *chip, int tpm_suspend_pcr);
+int tpm1_pm_suspend(struct tpm_chip *chip, u32 tpm_suspend_pcr);
int tpm1_do_selftest(struct tpm_chip *chip);
int tpm1_auto_startup(struct tpm_chip *chip);
int tpm1_get_timeouts(struct tpm_chip *chip);
unsigned long tpm1_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);
-int tpm1_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash,
+int tpm1_pcr_extend(struct tpm_chip *chip, u32 pcr_idx, const u8 *hash,
const char *log_msg);
-int tpm1_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
+int tpm1_pcr_read(struct tpm_chip *chip, u32 pcr_idx, u8 *res_buf);
ssize_t tpm1_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap,
const char *desc, size_t min_cap_length);
int tpm1_get_random(struct tpm_chip *chip, u8 *out, size_t max);
@@ -567,8 +567,8 @@ 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, const u8 *hash);
+int tpm2_pcr_read(struct tpm_chip *chip, u32 pcr_idx, u8 *res_buf);
+int tpm2_pcr_extend(struct tpm_chip *chip, u32 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 e81641f9d0e3..777b1158e1b5 100644
--- a/drivers/char/tpm/tpm1-cmd.c
+++ b/drivers/char/tpm/tpm1-cmd.c
@@ -449,9 +449,7 @@ int tpm1_get_timeouts(struct tpm_chip *chip)
}

#define TPM_ORD_PCR_EXTEND 20
-#define EXTEND_PCR_RESULT_SIZE 34
-#define EXTEND_PCR_RESULT_BODY_SIZE 20
-int tpm1_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash,
+int tpm1_pcr_extend(struct tpm_chip *chip, u32 pcr_idx, const u8 *hash,
const char *log_msg)
{
struct tpm_buf buf;
@@ -464,8 +462,8 @@ int tpm1_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash,
tpm_buf_append_u32(&buf, pcr_idx);
tpm_buf_append(&buf, hash, TPM_DIGEST_SIZE);

- rc = tpm_transmit_cmd(chip, NULL, buf.data, EXTEND_PCR_RESULT_SIZE,
- EXTEND_PCR_RESULT_BODY_SIZE, 0, log_msg);
+ rc = tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE,
+ TPM_DIGEST_SIZE, 0, log_msg);

tpm_buf_destroy(&buf);
return rc;
@@ -575,7 +573,7 @@ int tpm1_get_random(struct tpm_chip *chip, u8 *dest, size_t max)
}

#define TPM_ORD_PCRREAD 21
-int tpm1_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
+int tpm1_pcr_read(struct tpm_chip *chip, u32 pcr_idx, u8 *res_buf)
{
struct tpm_buf buf;
int rc;
@@ -663,7 +661,7 @@ int tpm1_do_selftest(struct tpm_chip *chip)

do {
/* Attempt to read a PCR value */
- rc = tpm1_pcr_read_dev(chip, 0, dummy);
+ rc = tpm1_pcr_read(chip, 0, dummy);

/* Some buggy TPMs will not respond to tpm_tis_ready() for
* around 300ms while the self test is ongoing, keep trying
@@ -732,7 +730,7 @@ static const struct tpm_input_header savestate_header = {
* We are about to suspend. Save the TPM state
* so that it can be restored.
*/
-int tpm1_pm_suspend(struct tpm_chip *chip, int tpm_suspend_pcr)
+int tpm1_pm_suspend(struct tpm_chip *chip, u32 tpm_suspend_pcr)
{
u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 };
struct tpm_cmd_t cmd;
diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index b0b714309440..c2f297140dc7 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -128,7 +128,7 @@ struct tpm2_pcr_read_out {
*
* Return: Same as with tpm_transmit_cmd.
*/
-int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
+int tpm2_pcr_read(struct tpm_chip *chip, u32 pcr_idx, u8 *res_buf)
{
int rc;
struct tpm_buf buf;
@@ -178,7 +178,7 @@ struct tpm2_null_auth_area {
*
* Return: Same as with tpm_transmit_cmd.
*/
-static int __tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, u32 count,
+static int __tpm2_pcr_extend(struct tpm_chip *chip, u32 pcr_idx, u32 count,
struct tpm2_digest *digests)
{
struct tpm_buf buf;
@@ -225,7 +225,7 @@ static 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 tpm2_pcr_extend(struct tpm_chip *chip, u32 pcr_idx, const u8 *hash)
{
int rc;
struct tpm2_digest digest_list[ARRAY_SIZE(chip->active_banks)];
diff --git a/include/linux/tpm.h b/include/linux/tpm.h
index 4609b94142d4..44c13cdf720a 100644
--- a/include/linux/tpm.h
+++ b/include/linux/tpm.h
@@ -53,7 +53,7 @@ struct tpm_class_ops {
#if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE)

extern int tpm_is_tpm2(struct tpm_chip *chip);
-extern int tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
+int tpm_pcr_read(struct tpm_chip *chip, u32 pcr_idx, u8 *res_buf);
extern int tpm_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash);
extern int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen);
extern int tpm_get_random(struct tpm_chip *chip, u8 *data, size_t max);
diff --git a/security/integrity/ima/ima_crypto.c b/security/integrity/ima/ima_crypto.c
index 7e7e7e7c250a..959d9edc113a 100644
--- a/security/integrity/ima/ima_crypto.c
+++ b/security/integrity/ima/ima_crypto.c
@@ -629,7 +629,7 @@ int ima_calc_buffer_hash(const void *buf, loff_t len,
return calc_buffer_shash(buf, len, hash);
}

-static void __init ima_pcrread(int idx, u8 *pcr)
+static void __init ima_pcrread(u32 idx, u8 *pcr)
{
if (!ima_tpm_chip)
return;
@@ -645,7 +645,8 @@ static int __init ima_calc_boot_aggregate_tfm(char *digest,
struct crypto_shash *tfm)
{
u8 pcr_i[TPM_DIGEST_SIZE];
- int rc, i;
+ int rc;
+ u32 i;
SHASH_DESC_ON_STACK(shash, tfm);

shash->tfm = tfm;
--
2.14.4
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