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path: root/drivers/char/tpm/tpm-interface.c
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Diffstat (limited to 'drivers/char/tpm/tpm-interface.c')
-rw-r--r--drivers/char/tpm/tpm-interface.c231
1 files changed, 98 insertions, 133 deletions
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 1d6729be4cd6..76df4fbcf089 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -30,9 +30,9 @@
#include <linux/spinlock.h>
#include <linux/freezer.h>
#include <linux/pm_runtime.h>
+#include <linux/tpm_eventlog.h>
#include "tpm.h"
-#include "tpm_eventlog.h"
#define TPM_MAX_ORDINAL 243
#define TSC_MAX_ORDINAL 12
@@ -328,7 +328,7 @@ unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
}
EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
-static bool tpm_validate_command(struct tpm_chip *chip,
+static int tpm_validate_command(struct tpm_chip *chip,
struct tpm_space *space,
const u8 *cmd,
size_t len)
@@ -340,10 +340,10 @@ static bool tpm_validate_command(struct tpm_chip *chip,
unsigned int nr_handles;
if (len < TPM_HEADER_SIZE)
- return false;
+ return -EINVAL;
if (!space)
- return true;
+ return 0;
if (chip->flags & TPM_CHIP_FLAG_TPM2 && chip->nr_commands) {
cc = be32_to_cpu(header->ordinal);
@@ -352,7 +352,7 @@ static bool tpm_validate_command(struct tpm_chip *chip,
if (i < 0) {
dev_dbg(&chip->dev, "0x%04X is an invalid command\n",
cc);
- return false;
+ return -EOPNOTSUPP;
}
attrs = chip->cc_attrs_tbl[i];
@@ -362,11 +362,11 @@ static bool tpm_validate_command(struct tpm_chip *chip,
goto err_len;
}
- return true;
+ return 0;
err_len:
dev_dbg(&chip->dev,
"%s: insufficient command length %zu", __func__, len);
- return false;
+ return -EINVAL;
}
/**
@@ -391,8 +391,20 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
unsigned long stop;
bool need_locality;
- if (!tpm_validate_command(chip, space, buf, bufsiz))
- return -EINVAL;
+ rc = tpm_validate_command(chip, space, buf, bufsiz);
+ if (rc == -EINVAL)
+ return rc;
+ /*
+ * If the command is not implemented by the TPM, synthesize a
+ * response with a TPM2_RC_COMMAND_CODE return for user-space.
+ */
+ if (rc == -EOPNOTSUPP) {
+ header->length = cpu_to_be32(sizeof(*header));
+ header->tag = cpu_to_be16(TPM2_ST_NO_SESSIONS);
+ header->return_code = cpu_to_be32(TPM2_RC_COMMAND_CODE |
+ TSS2_RESMGR_TPM_RC_LAYER);
+ return bufsiz;
+ }
if (bufsiz > TPM_BUFSIZE)
bufsiz = TPM_BUFSIZE;
@@ -413,6 +425,9 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
if (chip->dev.parent)
pm_runtime_get_sync(chip->dev.parent);
+ if (chip->ops->clk_enable != NULL)
+ chip->ops->clk_enable(chip, true);
+
/* Store the decision as chip->locality will be changed. */
need_locality = chip->locality == -1;
@@ -489,6 +504,9 @@ out:
chip->locality = -1;
}
out_no_locality:
+ if (chip->ops->clk_enable != NULL)
+ chip->ops->clk_enable(chip, false);
+
if (chip->dev.parent)
pm_runtime_put_sync(chip->dev.parent);
@@ -809,19 +827,20 @@ int tpm_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
}
/**
- * tpm_is_tpm2 - is the chip a TPM2 chip?
- * @chip_num: tpm idx # or ANY
+ * tpm_is_tpm2 - do we a have a TPM2 chip?
+ * @chip: a &struct tpm_chip instance, %NULL for the default chip
*
- * Returns < 0 on error, and 1 or 0 on success depending whether the chip
- * is a TPM2 chip.
+ * Return:
+ * 1 if we have a TPM2 chip.
+ * 0 if we don't have a TPM2 chip.
+ * A negative number for system errors (errno).
*/
-int tpm_is_tpm2(u32 chip_num)
+int tpm_is_tpm2(struct tpm_chip *chip)
{
- struct tpm_chip *chip;
int rc;
- chip = tpm_chip_find_get(chip_num);
- if (chip == NULL)
+ chip = tpm_chip_find_get(chip);
+ if (!chip)
return -ENODEV;
rc = (chip->flags & TPM_CHIP_FLAG_TPM2) != 0;
@@ -833,23 +852,19 @@ int tpm_is_tpm2(u32 chip_num)
EXPORT_SYMBOL_GPL(tpm_is_tpm2);
/**
- * tpm_pcr_read - read a pcr value
- * @chip_num: tpm idx # or ANY
- * @pcr_idx: pcr idx to retrieve
- * @res_buf: TPM_PCR value
- * size of res_buf is 20 bytes (or NULL if you don't care)
+ * tpm_pcr_read - read a PCR value from SHA1 bank
+ * @chip: a &struct tpm_chip instance, %NULL for the default chip
+ * @pcr_idx: the PCR to be retrieved
+ * @res_buf: the value of the PCR
*
- * The TPM driver should be built-in, but for whatever reason it
- * isn't, protect against the chip disappearing, by incrementing
- * the module usage count.
+ * Return: same as with tpm_transmit_cmd()
*/
-int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf)
+int tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
{
- struct tpm_chip *chip;
int rc;
- chip = tpm_chip_find_get(chip_num);
- if (chip == NULL)
+ chip = tpm_chip_find_get(chip);
+ if (!chip)
return -ENODEV;
if (chip->flags & TPM_CHIP_FLAG_TPM2)
rc = tpm2_pcr_read(chip, pcr_idx, res_buf);
@@ -889,25 +904,26 @@ static int tpm1_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash,
}
/**
- * tpm_pcr_extend - extend pcr value with hash
- * @chip_num: tpm idx # or AN&
- * @pcr_idx: pcr idx to extend
- * @hash: hash value used to extend pcr value
+ * tpm_pcr_extend - extend a PCR value in SHA1 bank.
+ * @chip: a &struct tpm_chip instance, %NULL for the default chip
+ * @pcr_idx: the PCR to be retrieved
+ * @hash: the hash value used to extend the PCR value
*
- * The TPM driver should be built-in, but for whatever reason it
- * isn't, protect against the chip disappearing, by incrementing
- * the module usage count.
+ * Note: with TPM 2.0 extends also those banks with a known digest size to the
+ * cryto subsystem in order to prevent malicious use of those PCR banks. In the
+ * future we should dynamically determine digest sizes.
+ *
+ * Return: same as with tpm_transmit_cmd()
*/
-int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
+int tpm_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash)
{
int rc;
- struct tpm_chip *chip;
struct tpm2_digest digest_list[ARRAY_SIZE(chip->active_banks)];
u32 count = 0;
int i;
- chip = tpm_chip_find_get(chip_num);
- if (chip == NULL)
+ chip = tpm_chip_find_get(chip);
+ if (!chip)
return -ENODEV;
if (chip->flags & TPM_CHIP_FLAG_TPM2) {
@@ -1019,82 +1035,29 @@ out:
return rc;
}
-int tpm_send(u32 chip_num, void *cmd, size_t buflen)
+/**
+ * tpm_send - send a TPM command
+ * @chip: a &struct tpm_chip instance, %NULL for the default chip
+ * @cmd: a TPM command buffer
+ * @buflen: the length of the TPM command buffer
+ *
+ * Return: same as with tpm_transmit_cmd()
+ */
+int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen)
{
- struct tpm_chip *chip;
int rc;
- chip = tpm_chip_find_get(chip_num);
- if (chip == NULL)
+ chip = tpm_chip_find_get(chip);
+ if (!chip)
return -ENODEV;
rc = tpm_transmit_cmd(chip, NULL, cmd, buflen, 0, 0,
- "attempting tpm_cmd");
+ "attempting to a send a command");
tpm_put_ops(chip);
return rc;
}
EXPORT_SYMBOL_GPL(tpm_send);
-static bool wait_for_tpm_stat_cond(struct tpm_chip *chip, u8 mask,
- bool check_cancel, bool *canceled)
-{
- u8 status = chip->ops->status(chip);
-
- *canceled = false;
- if ((status & mask) == mask)
- return true;
- if (check_cancel && chip->ops->req_canceled(chip, status)) {
- *canceled = true;
- return true;
- }
- return false;
-}
-
-int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
- wait_queue_head_t *queue, bool check_cancel)
-{
- unsigned long stop;
- long rc;
- u8 status;
- bool canceled = false;
-
- /* check current status */
- status = chip->ops->status(chip);
- if ((status & mask) == mask)
- return 0;
-
- stop = jiffies + timeout;
-
- if (chip->flags & TPM_CHIP_FLAG_IRQ) {
-again:
- timeout = stop - jiffies;
- if ((long)timeout <= 0)
- return -ETIME;
- rc = wait_event_interruptible_timeout(*queue,
- wait_for_tpm_stat_cond(chip, mask, check_cancel,
- &canceled),
- timeout);
- if (rc > 0) {
- if (canceled)
- return -ECANCELED;
- return 0;
- }
- if (rc == -ERESTARTSYS && freezing(current)) {
- clear_thread_flag(TIF_SIGPENDING);
- goto again;
- }
- } else {
- do {
- tpm_msleep(TPM_TIMEOUT);
- status = chip->ops->status(chip);
- if ((status & mask) == mask)
- return 0;
- } while (time_before(jiffies, stop));
- }
- return -ETIME;
-}
-EXPORT_SYMBOL_GPL(wait_for_tpm_stat);
-
#define TPM_ORD_SAVESTATE 152
#define SAVESTATE_RESULT_SIZE 10
@@ -1187,16 +1150,15 @@ static const struct tpm_input_header tpm_getrandom_header = {
};
/**
- * tpm_get_random() - Get random bytes from the tpm's RNG
- * @chip_num: A specific chip number for the request or TPM_ANY_NUM
- * @out: destination buffer for the random bytes
- * @max: the max number of bytes to write to @out
+ * tpm_get_random() - get random bytes from the TPM's RNG
+ * @chip: a &struct tpm_chip instance, %NULL for the default chip
+ * @out: destination buffer for the random bytes
+ * @max: the max number of bytes to write to @out
*
- * Returns < 0 on error and the number of bytes read on success
+ * Return: same as with tpm_transmit_cmd()
*/
-int tpm_get_random(u32 chip_num, u8 *out, size_t max)
+int tpm_get_random(struct tpm_chip *chip, u8 *out, size_t max)
{
- struct tpm_chip *chip;
struct tpm_cmd_t tpm_cmd;
u32 recd, num_bytes = min_t(u32, max, TPM_MAX_RNG_DATA), rlength;
int err, total = 0, retries = 5;
@@ -1205,8 +1167,8 @@ int tpm_get_random(u32 chip_num, u8 *out, size_t max)
if (!out || !num_bytes || max > TPM_MAX_RNG_DATA)
return -EINVAL;
- chip = tpm_chip_find_get(chip_num);
- if (chip == NULL)
+ chip = tpm_chip_find_get(chip);
+ if (!chip)
return -ENODEV;
if (chip->flags & TPM_CHIP_FLAG_TPM2) {
@@ -1248,22 +1210,23 @@ int tpm_get_random(u32 chip_num, u8 *out, size_t max)
EXPORT_SYMBOL_GPL(tpm_get_random);
/**
- * tpm_seal_trusted() - seal a trusted key
- * @chip_num: A specific chip number for the request or TPM_ANY_NUM
- * @options: authentication values and other options
- * @payload: the key data in clear and encrypted form
+ * tpm_seal_trusted() - seal a trusted key payload
+ * @chip: a &struct tpm_chip instance, %NULL for the default chip
+ * @options: authentication values and other options
+ * @payload: the key data in clear and encrypted form
*
- * Returns < 0 on error and 0 on success. At the moment, only TPM 2.0 chips
- * are supported.
+ * Note: only TPM 2.0 chip are supported. TPM 1.x implementation is located in
+ * the keyring subsystem.
+ *
+ * Return: same as with tpm_transmit_cmd()
*/
-int tpm_seal_trusted(u32 chip_num, struct trusted_key_payload *payload,
+int tpm_seal_trusted(struct tpm_chip *chip, struct trusted_key_payload *payload,
struct trusted_key_options *options)
{
- struct tpm_chip *chip;
int rc;
- chip = tpm_chip_find_get(chip_num);
- if (chip == NULL || !(chip->flags & TPM_CHIP_FLAG_TPM2))
+ chip = tpm_chip_find_get(chip);
+ if (!chip || !(chip->flags & TPM_CHIP_FLAG_TPM2))
return -ENODEV;
rc = tpm2_seal_trusted(chip, payload, options);
@@ -1275,21 +1238,23 @@ EXPORT_SYMBOL_GPL(tpm_seal_trusted);
/**
* tpm_unseal_trusted() - unseal a trusted key
- * @chip_num: A specific chip number for the request or TPM_ANY_NUM
- * @options: authentication values and other options
- * @payload: the key data in clear and encrypted form
+ * @chip: a &struct tpm_chip instance, %NULL for the default chip
+ * @options: authentication values and other options
+ * @payload: the key data in clear and encrypted form
+ *
+ * Note: only TPM 2.0 chip are supported. TPM 1.x implementation is located in
+ * the keyring subsystem.
*
- * Returns < 0 on error and 0 on success. At the moment, only TPM 2.0 chips
- * are supported.
+ * Return: same as with tpm_transmit_cmd()
*/
-int tpm_unseal_trusted(u32 chip_num, struct trusted_key_payload *payload,
+int tpm_unseal_trusted(struct tpm_chip *chip,
+ struct trusted_key_payload *payload,
struct trusted_key_options *options)
{
- struct tpm_chip *chip;
int rc;
- chip = tpm_chip_find_get(chip_num);
- if (chip == NULL || !(chip->flags & TPM_CHIP_FLAG_TPM2))
+ chip = tpm_chip_find_get(chip);
+ if (!chip || !(chip->flags & TPM_CHIP_FLAG_TPM2))
return -ENODEV;
rc = tpm2_unseal_trusted(chip, payload, options);