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path: root/drivers/char/tpm/tpm-sysfs.c
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Diffstat (limited to 'drivers/char/tpm/tpm-sysfs.c')
-rw-r--r--drivers/char/tpm/tpm-sysfs.c138
1 files changed, 84 insertions, 54 deletions
diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c
index b88e08ec2c59..533a260d744e 100644
--- a/drivers/char/tpm/tpm-sysfs.c
+++ b/drivers/char/tpm/tpm-sysfs.c
@@ -39,7 +39,6 @@ static ssize_t pubek_show(struct device *dev, struct device_attribute *attr,
{
struct tpm_buf tpm_buf;
struct tpm_readpubek_out *out;
- ssize_t rc;
int i;
char *str = buf;
struct tpm_chip *chip = to_tpm_chip(dev);
@@ -47,19 +46,17 @@ static ssize_t pubek_show(struct device *dev, struct device_attribute *attr,
memset(&anti_replay, 0, sizeof(anti_replay));
- rc = tpm_buf_init(&tpm_buf, TPM_TAG_RQU_COMMAND, TPM_ORD_READPUBEK);
- if (rc)
- return rc;
+ if (tpm_try_get_ops(chip))
+ return 0;
+
+ if (tpm_buf_init(&tpm_buf, TPM_TAG_RQU_COMMAND, TPM_ORD_READPUBEK))
+ goto out_ops;
tpm_buf_append(&tpm_buf, anti_replay, sizeof(anti_replay));
- rc = tpm_transmit_cmd(chip, NULL, tpm_buf.data, PAGE_SIZE,
- READ_PUBEK_RESULT_MIN_BODY_SIZE, 0,
- "attempting to read the PUBEK");
- if (rc) {
- tpm_buf_destroy(&tpm_buf);
- return 0;
- }
+ if (tpm_transmit_cmd(chip, &tpm_buf, READ_PUBEK_RESULT_MIN_BODY_SIZE,
+ "attempting to read the PUBEK"))
+ goto out_buf;
out = (struct tpm_readpubek_out *)&tpm_buf.data[10];
str +=
@@ -90,9 +87,11 @@ static ssize_t pubek_show(struct device *dev, struct device_attribute *attr,
str += sprintf(str, "\n");
}
- rc = str - buf;
+out_buf:
tpm_buf_destroy(&tpm_buf);
- return rc;
+out_ops:
+ tpm_put_ops(chip);
+ return str - buf;
}
static DEVICE_ATTR_RO(pubek);
@@ -101,27 +100,32 @@ static ssize_t pcrs_show(struct device *dev, struct device_attribute *attr,
{
cap_t cap;
u8 digest[TPM_DIGEST_SIZE];
- ssize_t rc;
u32 i, j, num_pcrs;
char *str = buf;
struct tpm_chip *chip = to_tpm_chip(dev);
- rc = tpm1_getcap(chip, TPM_CAP_PROP_PCR, &cap,
- "attempting to determine the number of PCRS",
- sizeof(cap.num_pcrs));
- if (rc)
+ if (tpm_try_get_ops(chip))
return 0;
+ if (tpm1_getcap(chip, TPM_CAP_PROP_PCR, &cap,
+ "attempting to determine the number of PCRS",
+ sizeof(cap.num_pcrs))) {
+ tpm_put_ops(chip);
+ return 0;
+ }
+
num_pcrs = be32_to_cpu(cap.num_pcrs);
for (i = 0; i < num_pcrs; i++) {
- rc = tpm1_pcr_read(chip, i, digest);
- if (rc)
+ if (tpm1_pcr_read(chip, i, digest)) {
+ str = buf;
break;
+ }
str += sprintf(str, "PCR-%02d: ", i);
for (j = 0; j < TPM_DIGEST_SIZE; j++)
str += sprintf(str, "%02X ", digest[j]);
str += sprintf(str, "\n");
}
+ tpm_put_ops(chip);
return str - buf;
}
static DEVICE_ATTR_RO(pcrs);
@@ -129,16 +133,21 @@ static DEVICE_ATTR_RO(pcrs);
static ssize_t enabled_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
+ struct tpm_chip *chip = to_tpm_chip(dev);
+ ssize_t rc = 0;
cap_t cap;
- ssize_t rc;
- rc = tpm1_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_PERM, &cap,
- "attempting to determine the permanent enabled state",
- sizeof(cap.perm_flags));
- if (rc)
+ if (tpm_try_get_ops(chip))
return 0;
+ if (tpm1_getcap(chip, TPM_CAP_FLAG_PERM, &cap,
+ "attempting to determine the permanent enabled state",
+ sizeof(cap.perm_flags)))
+ goto out_ops;
+
rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
+out_ops:
+ tpm_put_ops(chip);
return rc;
}
static DEVICE_ATTR_RO(enabled);
@@ -146,16 +155,21 @@ static DEVICE_ATTR_RO(enabled);
static ssize_t active_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
+ struct tpm_chip *chip = to_tpm_chip(dev);
+ ssize_t rc = 0;
cap_t cap;
- ssize_t rc;
- rc = tpm1_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_PERM, &cap,
- "attempting to determine the permanent active state",
- sizeof(cap.perm_flags));
- if (rc)
+ if (tpm_try_get_ops(chip))
return 0;
+ if (tpm1_getcap(chip, TPM_CAP_FLAG_PERM, &cap,
+ "attempting to determine the permanent active state",
+ sizeof(cap.perm_flags)))
+ goto out_ops;
+
rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
+out_ops:
+ tpm_put_ops(chip);
return rc;
}
static DEVICE_ATTR_RO(active);
@@ -163,16 +177,21 @@ static DEVICE_ATTR_RO(active);
static ssize_t owned_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
+ struct tpm_chip *chip = to_tpm_chip(dev);
+ ssize_t rc = 0;
cap_t cap;
- ssize_t rc;
- rc = tpm1_getcap(to_tpm_chip(dev), TPM_CAP_PROP_OWNER, &cap,
- "attempting to determine the owner state",
- sizeof(cap.owned));
- if (rc)
+ if (tpm_try_get_ops(chip))
return 0;
+ if (tpm1_getcap(to_tpm_chip(dev), TPM_CAP_PROP_OWNER, &cap,
+ "attempting to determine the owner state",
+ sizeof(cap.owned)))
+ goto out_ops;
+
rc = sprintf(buf, "%d\n", cap.owned);
+out_ops:
+ tpm_put_ops(chip);
return rc;
}
static DEVICE_ATTR_RO(owned);
@@ -180,16 +199,21 @@ static DEVICE_ATTR_RO(owned);
static ssize_t temp_deactivated_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
+ struct tpm_chip *chip = to_tpm_chip(dev);
+ ssize_t rc = 0;
cap_t cap;
- ssize_t rc;
- rc = tpm1_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_VOL, &cap,
- "attempting to determine the temporary state",
- sizeof(cap.stclear_flags));
- if (rc)
+ if (tpm_try_get_ops(chip))
return 0;
+ if (tpm1_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_VOL, &cap,
+ "attempting to determine the temporary state",
+ sizeof(cap.stclear_flags)))
+ goto out_ops;
+
rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
+out_ops:
+ tpm_put_ops(chip);
return rc;
}
static DEVICE_ATTR_RO(temp_deactivated);
@@ -198,15 +222,18 @@ static ssize_t caps_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct tpm_chip *chip = to_tpm_chip(dev);
- cap_t cap;
- ssize_t rc;
+ ssize_t rc = 0;
char *str = buf;
+ cap_t cap;
- rc = tpm1_getcap(chip, TPM_CAP_PROP_MANUFACTURER, &cap,
- "attempting to determine the manufacturer",
- sizeof(cap.manufacturer_id));
- if (rc)
+ if (tpm_try_get_ops(chip))
return 0;
+
+ if (tpm1_getcap(chip, TPM_CAP_PROP_MANUFACTURER, &cap,
+ "attempting to determine the manufacturer",
+ sizeof(cap.manufacturer_id)))
+ goto out_ops;
+
str += sprintf(str, "Manufacturer: 0x%x\n",
be32_to_cpu(cap.manufacturer_id));
@@ -223,11 +250,10 @@ static ssize_t caps_show(struct device *dev, struct device_attribute *attr,
cap.tpm_version_1_2.revMinor);
} else {
/* Otherwise just use TPM_STRUCT_VER */
- rc = tpm1_getcap(chip, TPM_CAP_VERSION_1_1, &cap,
- "attempting to determine the 1.1 version",
- sizeof(cap.tpm_version));
- if (rc)
- return 0;
+ if (tpm1_getcap(chip, TPM_CAP_VERSION_1_1, &cap,
+ "attempting to determine the 1.1 version",
+ sizeof(cap.tpm_version)))
+ goto out_ops;
str += sprintf(str,
"TCG version: %d.%d\nFirmware version: %d.%d\n",
cap.tpm_version.Major,
@@ -235,8 +261,10 @@ static ssize_t caps_show(struct device *dev, struct device_attribute *attr,
cap.tpm_version.revMajor,
cap.tpm_version.revMinor);
}
-
- return str - buf;
+ rc = str - buf;
+out_ops:
+ tpm_put_ops(chip);
+ return rc;
}
static DEVICE_ATTR_RO(caps);
@@ -244,10 +272,12 @@ static ssize_t cancel_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct tpm_chip *chip = to_tpm_chip(dev);
- if (chip == NULL)
+
+ if (tpm_try_get_ops(chip))
return 0;
chip->ops->cancel(chip);
+ tpm_put_ops(chip);
return count;
}
static DEVICE_ATTR_WO(cancel);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.