#include "tpm.h"
-#define TPM_MAX_ORDINAL 243
-#define TSC_MAX_ORDINAL 12
-#define TPM_PROTECTED_COMMAND 0x00
-#define TPM_CONNECTION_COMMAND 0x40
-
/*
* Bug workaround - some TPM's don't flush the most
* recently changed pcr on suspend, so force the flush
* with an extend to the selected _unused_ non-volatile pcr.
*/
-static int tpm_suspend_pcr;
+static u32 tpm_suspend_pcr;
module_param_named(suspend_pcr, tpm_suspend_pcr, uint, 0644);
MODULE_PARM_DESC(suspend_pcr,
"PCR to use for dummy writes to facilitate flush on suspend.");
-/*
- * Array with one entry per ordinal defining the maximum amount
- * of time the chip could take to return the result. The ordinal
- * designation of short, medium or long is defined in a table in
- * TCG Specification TPM Main Part 2 TPM Structures Section 17. The
- * values of the SHORT, MEDIUM, and LONG durations are retrieved
- * from the chip during initialization with a call to tpm_get_timeouts.
- */
-static const u8 tpm_ordinal_duration[TPM_MAX_ORDINAL] = {
- TPM_UNDEFINED, /* 0 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED, /* 5 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_SHORT, /* 10 */
- TPM_SHORT,
- TPM_MEDIUM,
- TPM_LONG,
- TPM_LONG,
- TPM_MEDIUM, /* 15 */
- TPM_SHORT,
- TPM_SHORT,
- TPM_MEDIUM,
- TPM_LONG,
- TPM_SHORT, /* 20 */
- TPM_SHORT,
- TPM_MEDIUM,
- TPM_MEDIUM,
- TPM_MEDIUM,
- TPM_SHORT, /* 25 */
- TPM_SHORT,
- TPM_MEDIUM,
- TPM_SHORT,
- TPM_SHORT,
- TPM_MEDIUM, /* 30 */
- TPM_LONG,
- TPM_MEDIUM,
- TPM_SHORT,
- TPM_SHORT,
- TPM_SHORT, /* 35 */
- TPM_MEDIUM,
- TPM_MEDIUM,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_MEDIUM, /* 40 */
- TPM_LONG,
- TPM_MEDIUM,
- TPM_SHORT,
- TPM_SHORT,
- TPM_SHORT, /* 45 */
- TPM_SHORT,
- TPM_SHORT,
- TPM_SHORT,
- TPM_LONG,
- TPM_MEDIUM, /* 50 */
- TPM_MEDIUM,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED, /* 55 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_MEDIUM, /* 60 */
- TPM_MEDIUM,
- TPM_MEDIUM,
- TPM_SHORT,
- TPM_SHORT,
- TPM_MEDIUM, /* 65 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_SHORT, /* 70 */
- TPM_SHORT,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED, /* 75 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_LONG, /* 80 */
- TPM_UNDEFINED,
- TPM_MEDIUM,
- TPM_LONG,
- TPM_SHORT,
- TPM_UNDEFINED, /* 85 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_SHORT, /* 90 */
- TPM_SHORT,
- TPM_SHORT,
- TPM_SHORT,
- TPM_SHORT,
- TPM_UNDEFINED, /* 95 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_MEDIUM, /* 100 */
- TPM_SHORT,
- TPM_SHORT,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED, /* 105 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_SHORT, /* 110 */
- TPM_SHORT,
- TPM_SHORT,
- TPM_SHORT,
- TPM_SHORT,
- TPM_SHORT, /* 115 */
- TPM_SHORT,
- TPM_SHORT,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_LONG, /* 120 */
- TPM_LONG,
- TPM_MEDIUM,
- TPM_UNDEFINED,
- TPM_SHORT,
- TPM_SHORT, /* 125 */
- TPM_SHORT,
- TPM_LONG,
- TPM_SHORT,
- TPM_SHORT,
- TPM_SHORT, /* 130 */
- TPM_MEDIUM,
- TPM_UNDEFINED,
- TPM_SHORT,
- TPM_MEDIUM,
- TPM_UNDEFINED, /* 135 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_SHORT, /* 140 */
- TPM_SHORT,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED, /* 145 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_SHORT, /* 150 */
- TPM_MEDIUM,
- TPM_MEDIUM,
- TPM_SHORT,
- TPM_SHORT,
- TPM_UNDEFINED, /* 155 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_SHORT, /* 160 */
- TPM_SHORT,
- TPM_SHORT,
- TPM_SHORT,
- TPM_UNDEFINED,
- TPM_UNDEFINED, /* 165 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_LONG, /* 170 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED, /* 175 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_MEDIUM, /* 180 */
- TPM_SHORT,
- TPM_MEDIUM,
- TPM_MEDIUM,
- TPM_MEDIUM,
- TPM_MEDIUM, /* 185 */
- TPM_SHORT,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED, /* 190 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED, /* 195 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_SHORT, /* 200 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_SHORT,
- TPM_SHORT, /* 205 */
- TPM_SHORT,
- TPM_SHORT,
- TPM_SHORT,
- TPM_SHORT,
- TPM_MEDIUM, /* 210 */
- TPM_UNDEFINED,
- TPM_MEDIUM,
- TPM_MEDIUM,
- TPM_MEDIUM,
- TPM_UNDEFINED, /* 215 */
- TPM_MEDIUM,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_SHORT,
- TPM_SHORT, /* 220 */
- TPM_SHORT,
- TPM_SHORT,
- TPM_SHORT,
- TPM_SHORT,
- TPM_UNDEFINED, /* 225 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_SHORT, /* 230 */
- TPM_LONG,
- TPM_MEDIUM,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED, /* 235 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_SHORT, /* 240 */
- TPM_UNDEFINED,
- TPM_MEDIUM,
-};
-
-/*
- * Returns max number of jiffies to wait
+/**
+ * tpm_calc_ordinal_duration() - calculate the maximum command duration
+ * @chip: TPM chip to use.
+ * @ordinal: TPM command ordinal.
+ *
+ * The function returns the maximum amount of time the chip could take
+ * to return the result for a particular ordinal in jiffies.
+ *
+ * Return: A maximal duration time for an ordinal in jiffies.
*/
-unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
- u32 ordinal)
+unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal)
{
- int duration_idx = TPM_UNDEFINED;
- int duration = 0;
-
- /*
- * We only have a duration table for protected commands, where the upper
- * 16 bits are 0. For the few other ordinals the fallback will be used.
- */
- if (ordinal < TPM_MAX_ORDINAL)
- duration_idx = tpm_ordinal_duration[ordinal];
-
- if (duration_idx != TPM_UNDEFINED)
- duration = chip->duration[duration_idx];
- if (duration <= 0)
- return 2 * 60 * HZ;
+ if (chip->flags & TPM_CHIP_FLAG_TPM2)
+ return tpm2_calc_ordinal_duration(chip, ordinal);
else
- return duration;
+ return tpm1_calc_ordinal_duration(chip, ordinal);
}
EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
-static int tpm_validate_command(struct tpm_chip *chip,
- struct tpm_space *space,
- const u8 *cmd,
- size_t len)
+static int tpm_validate_command(struct tpm_chip *chip, struct tpm_space *space,
+ const void *cmd, size_t len)
{
- const struct tpm_input_header *header = (const void *)cmd;
+ const struct tpm_header *header = cmd;
int i;
u32 cc;
u32 attrs;
return chip->ops->go_idle(chip);
}
-static ssize_t tpm_try_transmit(struct tpm_chip *chip,
- struct tpm_space *space,
- u8 *buf, size_t bufsiz,
- unsigned int flags)
+static ssize_t tpm_try_transmit(struct tpm_chip *chip, struct tpm_space *space,
+ void *buf, size_t bufsiz, unsigned int flags)
{
- struct tpm_output_header *header = (void *)buf;
+ struct tpm_header *header = buf;
int rc;
ssize_t len = 0;
u32 count, ordinal;
unsigned long stop;
- bool need_locality;
rc = tpm_validate_command(chip, space, buf, bufsiz);
if (rc == -EINVAL)
if (bufsiz > TPM_BUFSIZE)
bufsiz = TPM_BUFSIZE;
- count = be32_to_cpu(*((__be32 *) (buf + 2)));
- ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
+ count = be32_to_cpu(header->length);
+ ordinal = be32_to_cpu(header->ordinal);
if (count == 0)
return -ENODATA;
if (count > bufsiz) {
return -E2BIG;
}
- if (!(flags & TPM_TRANSMIT_UNLOCKED) && !(flags & TPM_TRANSMIT_NESTED))
- mutex_lock(&chip->tpm_mutex);
-
- 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;
-
- if (need_locality) {
- rc = tpm_request_locality(chip, flags);
- if (rc < 0)
- goto out_no_locality;
- }
-
- rc = tpm_cmd_ready(chip, flags);
- if (rc)
- goto out;
-
rc = tpm2_prepare_space(chip, space, ordinal, buf);
if (rc)
- goto out;
+ return rc;
rc = chip->ops->send(chip, buf, count);
if (rc < 0) {
if (rc != -EPIPE)
dev_err(&chip->dev,
- "%s: tpm_send: error %d\n", __func__, rc);
- goto out;
+ "%s: send(): error %d\n", __func__, rc);
+ goto out_rc;
+ }
+
+ /* A sanity check. send() should just return zero on success e.g.
+ * not the command length.
+ */
+ if (rc > 0) {
+ dev_warn(&chip->dev,
+ "%s: send(): invalid value %d\n", __func__, rc);
+ rc = 0;
}
if (chip->flags & TPM_CHIP_FLAG_IRQ)
goto out_recv;
- if (chip->flags & TPM_CHIP_FLAG_TPM2)
- stop = jiffies + tpm2_calc_ordinal_duration(chip, ordinal);
- else
- stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
+ stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
do {
u8 status = chip->ops->status(chip);
if ((status & chip->ops->req_complete_mask) ==
if (chip->ops->req_canceled(chip, status)) {
dev_err(&chip->dev, "Operation Canceled\n");
rc = -ECANCELED;
- goto out;
+ goto out_rc;
}
tpm_msleep(TPM_TIMEOUT_POLL);
chip->ops->cancel(chip);
dev_err(&chip->dev, "Operation Timed out\n");
rc = -ETIME;
- goto out;
+ goto out_rc;
out_recv:
len = chip->ops->recv(chip, buf, bufsiz);
if (len < 0) {
rc = len;
- dev_err(&chip->dev,
- "tpm_transmit: tpm_recv: error %d\n", rc);
- goto out;
- } else if (len < TPM_HEADER_SIZE) {
- rc = -EFAULT;
- goto out;
- }
-
- if (len != be32_to_cpu(header->length)) {
+ dev_err(&chip->dev, "tpm_transmit: tpm_recv: error %d\n", rc);
+ } else if (len < TPM_HEADER_SIZE || len != be32_to_cpu(header->length))
rc = -EFAULT;
- goto out;
- }
-
- rc = tpm2_commit_space(chip, space, ordinal, buf, &len);
- if (rc)
- dev_err(&chip->dev, "tpm2_commit_space: error %d\n", rc);
-
-out:
- rc = tpm_go_idle(chip, flags);
- if (rc)
- goto out;
-
- if (need_locality)
- tpm_relinquish_locality(chip, flags);
-out_no_locality:
- if (chip->ops->clk_enable != NULL)
- chip->ops->clk_enable(chip, false);
+out_rc:
+ if (!rc)
+ rc = tpm2_commit_space(chip, space, ordinal, buf, &len);
- if (!(flags & TPM_TRANSMIT_UNLOCKED) && !(flags & TPM_TRANSMIT_NESTED))
- mutex_unlock(&chip->tpm_mutex);
return rc ? rc : len;
}
/**
* tpm_transmit - Internal kernel interface to transmit TPM commands.
+ * @chip: a TPM chip to use
+ * @space: a TPM space
+ * @buf: a TPM command buffer
+ * @bufsiz: length of the TPM command buffer
+ * @flags: TPM transmit flags
*
- * @chip: TPM chip to use
- * @space: tpm space
- * @buf: TPM command buffer
- * @bufsiz: length of the TPM command buffer
- * @flags: tpm transmit flags - bitmap
- *
- * A wrapper around tpm_try_transmit that handles TPM2_RC_RETRY
- * returns from the TPM and retransmits the command after a delay up
- * to a maximum wait of TPM2_DURATION_LONG.
+ * A wrapper around tpm_try_transmit() that handles TPM2_RC_RETRY returns from
+ * the TPM and retransmits the command after a delay up to a maximum wait of
+ * TPM2_DURATION_LONG.
*
- * Note: TPM1 never returns TPM2_RC_RETRY so the retry logic is TPM2
- * only
+ * Note that TPM 1.x never returns TPM2_RC_RETRY so the retry logic is TPM 2.0
+ * only.
*
* Return:
- * the length of the return when the operation is successful.
- * A negative number for system errors (errno).
+ * * The response length - OK
+ * * -errno - A system error
*/
ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
u8 *buf, size_t bufsiz, unsigned int flags)
{
- struct tpm_output_header *header = (struct tpm_output_header *)buf;
+ struct tpm_header *header = (struct tpm_header *)buf;
/* space for header and handles */
u8 save[TPM_HEADER_SIZE + 3*sizeof(u32)];
unsigned int delay_msec = TPM2_DURATION_SHORT;
+ bool has_locality = false;
u32 rc = 0;
ssize_t ret;
const size_t save_size = min(space ? sizeof(save) : TPM_HEADER_SIZE,
memcpy(save, buf, save_size);
for (;;) {
+ if (!(flags & TPM_TRANSMIT_UNLOCKED) &&
+ !(flags & TPM_TRANSMIT_NESTED))
+ mutex_lock(&chip->tpm_mutex);
+
+ if (chip->ops->clk_enable != NULL)
+ chip->ops->clk_enable(chip, true);
+
+ if (chip->locality == -1) {
+ ret = tpm_request_locality(chip, flags);
+ if (ret)
+ goto out_locality;
+ has_locality = true;
+ }
+
+ ret = tpm_cmd_ready(chip, flags);
+ if (ret)
+ goto out_locality;
+
ret = tpm_try_transmit(chip, space, buf, bufsiz, flags);
+
+ /* This may fail but do not override ret. */
+ tpm_go_idle(chip, flags);
+
+out_locality:
+ if (has_locality)
+ tpm_relinquish_locality(chip, flags);
+
+ if (chip->ops->clk_enable != NULL)
+ chip->ops->clk_enable(chip, false);
+
+ if (!(flags & TPM_TRANSMIT_UNLOCKED) &&
+ !(flags & TPM_TRANSMIT_NESTED))
+ mutex_unlock(&chip->tpm_mutex);
+
if (ret < 0)
break;
rc = be32_to_cpu(header->return_code);
}
return ret;
}
+
/**
* tpm_transmit_cmd - send a tpm command to the device
- * The function extracts tpm out header return code
- *
- * @chip: TPM chip to use
- * @space: tpm space
- * @buf: TPM command buffer
- * @bufsiz: length of the buffer
- * @min_rsp_body_length: minimum expected length of response body
- * @flags: tpm transmit flags - bitmap
- * @desc: command description used in the error message
+ * @chip: a TPM chip to use
+ * @space: a TPM space
+ * @buf: a TPM command buffer
+ * @min_rsp_body_length: minimum expected length of response body
+ * @flags: TPM transmit flags
+ * @desc: command description used in the error message
*
* Return:
- * 0 when the operation is successful.
- * A negative number for system errors (errno).
- * A positive number for a TPM error.
+ * * 0 - OK
+ * * -errno - A system error
+ * * TPM_RC - A TPM error
*/
ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_space *space,
- void *buf, size_t bufsiz,
- size_t min_rsp_body_length, unsigned int flags,
- const char *desc)
+ struct tpm_buf *buf, size_t min_rsp_body_length,
+ unsigned int flags, const char *desc)
{
- const struct tpm_output_header *header = buf;
+ const struct tpm_header *header = (struct tpm_header *)buf->data;
int err;
ssize_t len;
- len = tpm_transmit(chip, space, buf, bufsiz, flags);
+ len = tpm_transmit(chip, space, buf->data, PAGE_SIZE, flags);
if (len < 0)
return len;
err = be32_to_cpu(header->return_code);
if (err != 0 && err != TPM_ERR_DISABLED && err != TPM_ERR_DEACTIVATED
- && desc)
+ && err != TPM2_RC_TESTING && desc)
dev_err(&chip->dev, "A TPM error (%d) occurred %s\n", err,
desc);
if (err)
}
EXPORT_SYMBOL_GPL(tpm_transmit_cmd);
-#define TPM_ORD_STARTUP 153
-#define TPM_ST_CLEAR 1
-
-/**
- * tpm_startup - turn on the TPM
- * @chip: TPM chip to use
- *
- * Normally the firmware should start the TPM. This function is provided as a
- * workaround if this does not happen. A legal case for this could be for
- * example when a TPM emulator is used.
- *
- * Return: same as tpm_transmit_cmd()
- */
-int tpm_startup(struct tpm_chip *chip)
-{
- struct tpm_buf buf;
- int rc;
-
- dev_info(&chip->dev, "starting up the TPM manually\n");
-
- if (chip->flags & TPM_CHIP_FLAG_TPM2) {
- rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_STARTUP);
- if (rc < 0)
- return rc;
-
- tpm_buf_append_u16(&buf, TPM2_SU_CLEAR);
- } else {
- rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_STARTUP);
- if (rc < 0)
- return rc;
-
- tpm_buf_append_u16(&buf, TPM_ST_CLEAR);
- }
-
- rc = tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE, 0, 0,
- "attempting to start the TPM");
-
- tpm_buf_destroy(&buf);
- return rc;
-}
-
-#define TPM_DIGEST_SIZE 20
-#define TPM_RET_CODE_IDX 6
-#define TPM_INTERNAL_RESULT_SIZE 200
-#define TPM_ORD_GET_CAP 101
-#define TPM_ORD_GET_RANDOM 70
-
-static const struct tpm_input_header tpm_getcap_header = {
- .tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
- .length = cpu_to_be32(22),
- .ordinal = cpu_to_be32(TPM_ORD_GET_CAP)
-};
-
-ssize_t tpm_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap,
- const char *desc, size_t min_cap_length)
-{
- struct tpm_buf buf;
- int rc;
-
- rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_GET_CAP);
- if (rc)
- return rc;
-
- if (subcap_id == TPM_CAP_VERSION_1_1 ||
- subcap_id == TPM_CAP_VERSION_1_2) {
- tpm_buf_append_u32(&buf, subcap_id);
- tpm_buf_append_u32(&buf, 0);
- } else {
- if (subcap_id == TPM_CAP_FLAG_PERM ||
- subcap_id == TPM_CAP_FLAG_VOL)
- tpm_buf_append_u32(&buf, TPM_CAP_FLAG);
- else
- tpm_buf_append_u32(&buf, TPM_CAP_PROP);
-
- tpm_buf_append_u32(&buf, 4);
- tpm_buf_append_u32(&buf, subcap_id);
- }
- rc = tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE,
- min_cap_length, 0, desc);
- if (!rc)
- *cap = *(cap_t *)&buf.data[TPM_HEADER_SIZE + 4];
-
- tpm_buf_destroy(&buf);
- return rc;
-}
-EXPORT_SYMBOL_GPL(tpm_getcap);
-
int tpm_get_timeouts(struct tpm_chip *chip)
{
- cap_t cap;
- unsigned long timeout_old[4], timeout_chip[4], timeout_eff[4];
- ssize_t rc;
-
if (chip->flags & TPM_CHIP_FLAG_HAVE_TIMEOUTS)
return 0;
- if (chip->flags & TPM_CHIP_FLAG_TPM2) {
- /* Fixed timeouts for TPM2 */
- chip->timeout_a = msecs_to_jiffies(TPM2_TIMEOUT_A);
- chip->timeout_b = msecs_to_jiffies(TPM2_TIMEOUT_B);
- chip->timeout_c = msecs_to_jiffies(TPM2_TIMEOUT_C);
- chip->timeout_d = msecs_to_jiffies(TPM2_TIMEOUT_D);
- chip->duration[TPM_SHORT] =
- msecs_to_jiffies(TPM2_DURATION_SHORT);
- chip->duration[TPM_MEDIUM] =
- msecs_to_jiffies(TPM2_DURATION_MEDIUM);
- chip->duration[TPM_LONG] =
- msecs_to_jiffies(TPM2_DURATION_LONG);
- chip->duration[TPM_LONG_LONG] =
- msecs_to_jiffies(TPM2_DURATION_LONG_LONG);
-
- chip->flags |= TPM_CHIP_FLAG_HAVE_TIMEOUTS;
- return 0;
- }
-
- rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, NULL,
- sizeof(cap.timeout));
- if (rc == TPM_ERR_INVALID_POSTINIT) {
- if (tpm_startup(chip))
- return rc;
-
- rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap,
- "attempting to determine the timeouts",
- sizeof(cap.timeout));
- }
-
- if (rc) {
- dev_err(&chip->dev,
- "A TPM error (%zd) occurred attempting to determine the timeouts\n",
- rc);
- return rc;
- }
-
- timeout_old[0] = jiffies_to_usecs(chip->timeout_a);
- timeout_old[1] = jiffies_to_usecs(chip->timeout_b);
- timeout_old[2] = jiffies_to_usecs(chip->timeout_c);
- timeout_old[3] = jiffies_to_usecs(chip->timeout_d);
- timeout_chip[0] = be32_to_cpu(cap.timeout.a);
- timeout_chip[1] = be32_to_cpu(cap.timeout.b);
- timeout_chip[2] = be32_to_cpu(cap.timeout.c);
- timeout_chip[3] = be32_to_cpu(cap.timeout.d);
- memcpy(timeout_eff, timeout_chip, sizeof(timeout_eff));
-
- /*
- * Provide ability for vendor overrides of timeout values in case
- * of misreporting.
- */
- if (chip->ops->update_timeouts != NULL)
- chip->timeout_adjusted =
- chip->ops->update_timeouts(chip, timeout_eff);
-
- if (!chip->timeout_adjusted) {
- /* Restore default if chip reported 0 */
- int i;
-
- for (i = 0; i < ARRAY_SIZE(timeout_eff); i++) {
- if (timeout_eff[i])
- continue;
-
- timeout_eff[i] = timeout_old[i];
- chip->timeout_adjusted = true;
- }
-
- if (timeout_eff[0] != 0 && timeout_eff[0] < 1000) {
- /* timeouts in msec rather usec */
- for (i = 0; i != ARRAY_SIZE(timeout_eff); i++)
- timeout_eff[i] *= 1000;
- chip->timeout_adjusted = true;
- }
- }
-
- /* Report adjusted timeouts */
- if (chip->timeout_adjusted) {
- dev_info(&chip->dev,
- HW_ERR "Adjusting reported timeouts: A %lu->%luus B %lu->%luus C %lu->%luus D %lu->%luus\n",
- timeout_chip[0], timeout_eff[0],
- timeout_chip[1], timeout_eff[1],
- timeout_chip[2], timeout_eff[2],
- timeout_chip[3], timeout_eff[3]);
- }
-
- chip->timeout_a = usecs_to_jiffies(timeout_eff[0]);
- chip->timeout_b = usecs_to_jiffies(timeout_eff[1]);
- chip->timeout_c = usecs_to_jiffies(timeout_eff[2]);
- chip->timeout_d = usecs_to_jiffies(timeout_eff[3]);
-
- rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_DURATION, &cap,
- "attempting to determine the durations",
- sizeof(cap.duration));
- if (rc)
- return rc;
-
- chip->duration[TPM_SHORT] =
- usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_short));
- chip->duration[TPM_MEDIUM] =
- usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_medium));
- chip->duration[TPM_LONG] =
- usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_long));
- chip->duration[TPM_LONG_LONG] = 0; /* not used under 1.2 */
-
- /* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above
- * value wrong and apparently reports msecs rather than usecs. So we
- * fix up the resulting too-small TPM_SHORT value to make things work.
- * We also scale the TPM_MEDIUM and -_LONG values by 1000.
- */
- if (chip->duration[TPM_SHORT] < (HZ / 100)) {
- chip->duration[TPM_SHORT] = HZ;
- chip->duration[TPM_MEDIUM] *= 1000;
- chip->duration[TPM_LONG] *= 1000;
- chip->duration_adjusted = true;
- dev_info(&chip->dev, "Adjusting TPM timeout parameters.");
- }
-
- chip->flags |= TPM_CHIP_FLAG_HAVE_TIMEOUTS;
- return 0;
+ if (chip->flags & TPM_CHIP_FLAG_TPM2)
+ return tpm2_get_timeouts(chip);
+ else
+ return tpm1_get_timeouts(chip);
}
EXPORT_SYMBOL_GPL(tpm_get_timeouts);
-#define TPM_ORD_CONTINUE_SELFTEST 83
-#define CONTINUE_SELFTEST_RESULT_SIZE 10
-
-static const struct tpm_input_header continue_selftest_header = {
- .tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
- .length = cpu_to_be32(10),
- .ordinal = cpu_to_be32(TPM_ORD_CONTINUE_SELFTEST),
-};
-
-/**
- * tpm_continue_selftest -- run TPM's selftest
- * @chip: TPM chip to use
- *
- * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
- * a TPM error code.
- */
-static int tpm_continue_selftest(struct tpm_chip *chip)
-{
- int rc;
- struct tpm_cmd_t cmd;
-
- cmd.header.in = continue_selftest_header;
- rc = tpm_transmit_cmd(chip, NULL, &cmd, CONTINUE_SELFTEST_RESULT_SIZE,
- 0, 0, "continue selftest");
- return rc;
-}
-
-#define TPM_ORDINAL_PCRREAD 21
-#define READ_PCR_RESULT_SIZE 30
-#define READ_PCR_RESULT_BODY_SIZE 20
-static const struct tpm_input_header pcrread_header = {
- .tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
- .length = cpu_to_be32(14),
- .ordinal = cpu_to_be32(TPM_ORDINAL_PCRREAD)
-};
-
-int tpm_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
-{
- int rc;
- struct tpm_cmd_t cmd;
-
- cmd.header.in = pcrread_header;
- cmd.params.pcrread_in.pcr_idx = cpu_to_be32(pcr_idx);
- rc = tpm_transmit_cmd(chip, NULL, &cmd, READ_PCR_RESULT_SIZE,
- READ_PCR_RESULT_BODY_SIZE, 0,
- "attempting to read a pcr value");
-
- if (rc == 0)
- memcpy(res_buf, cmd.params.pcrread_out.pcr_result,
- TPM_DIGEST_SIZE);
- return rc;
-}
-
/**
* tpm_is_tpm2 - do we a have a TPM2 chip?
* @chip: a &struct tpm_chip instance, %NULL for the default chip
*
* 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;
chip = tpm_find_get_ops(chip);
if (!chip)
return -ENODEV;
+
if (chip->flags & TPM_CHIP_FLAG_TPM2)
rc = tpm2_pcr_read(chip, pcr_idx, res_buf);
else
- rc = tpm_pcr_read_dev(chip, pcr_idx, res_buf);
+ rc = tpm1_pcr_read(chip, pcr_idx, res_buf);
+
tpm_put_ops(chip);
return rc;
}
EXPORT_SYMBOL_GPL(tpm_pcr_read);
-#define TPM_ORD_PCR_EXTEND 20
-#define EXTEND_PCR_RESULT_SIZE 34
-#define EXTEND_PCR_RESULT_BODY_SIZE 20
-static const struct tpm_input_header pcrextend_header = {
- .tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
- .length = cpu_to_be32(34),
- .ordinal = cpu_to_be32(TPM_ORD_PCR_EXTEND)
-};
-
-static int tpm1_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash,
- char *log_msg)
-{
- struct tpm_buf buf;
- int rc;
-
- rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_PCR_EXTEND);
- if (rc)
- return rc;
-
- 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);
- tpm_buf_destroy(&buf);
- return rc;
-}
-
/**
* tpm_pcr_extend - extend a PCR value in SHA1 bank.
* @chip: a &struct tpm_chip instance, %NULL for the default chip
*
* Return: same as with tpm_transmit_cmd()
*/
-int tpm_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash)
+int tpm_pcr_extend(struct tpm_chip *chip, u32 pcr_idx, const u8 *hash)
{
int rc;
struct tpm2_digest digest_list[ARRAY_SIZE(chip->active_banks)];
}
EXPORT_SYMBOL_GPL(tpm_pcr_extend);
-/**
- * tpm_do_selftest - have the TPM continue its selftest and wait until it
- * can receive further commands
- * @chip: TPM chip to use
- *
- * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
- * a TPM error code.
- */
-int tpm_do_selftest(struct tpm_chip *chip)
-{
- int rc;
- unsigned int loops;
- unsigned int delay_msec = 100;
- unsigned long duration;
- u8 dummy[TPM_DIGEST_SIZE];
-
- duration = tpm_calc_ordinal_duration(chip, TPM_ORD_CONTINUE_SELFTEST);
-
- loops = jiffies_to_msecs(duration) / delay_msec;
-
- rc = tpm_continue_selftest(chip);
- if (rc == TPM_ERR_INVALID_POSTINIT) {
- chip->flags |= TPM_CHIP_FLAG_ALWAYS_POWERED;
- dev_info(&chip->dev, "TPM not ready (%d)\n", rc);
- }
- /* This may fail if there was no TPM driver during a suspend/resume
- * cycle; some may return 10 (BAD_ORDINAL), others 28 (FAILEDSELFTEST)
- */
- if (rc)
- return rc;
-
- do {
- /* Attempt to read a PCR value */
- rc = tpm_pcr_read_dev(chip, 0, dummy);
-
- /* Some buggy TPMs will not respond to tpm_tis_ready() for
- * around 300ms while the self test is ongoing, keep trying
- * until the self test duration expires. */
- if (rc == -ETIME) {
- dev_info(
- &chip->dev, HW_ERR
- "TPM command timed out during continue self test");
- tpm_msleep(delay_msec);
- continue;
- }
-
- if (rc == TPM_ERR_DISABLED || rc == TPM_ERR_DEACTIVATED) {
- dev_info(&chip->dev,
- "TPM is disabled/deactivated (0x%X)\n", rc);
- /* TPM is disabled and/or deactivated; driver can
- * proceed and TPM does handle commands for
- * suspend/resume correctly
- */
- return 0;
- }
- if (rc != TPM_WARN_DOING_SELFTEST)
- return rc;
- tpm_msleep(delay_msec);
- } while (--loops > 0);
-
- return rc;
-}
-EXPORT_SYMBOL_GPL(tpm_do_selftest);
-
-/**
- * tpm1_auto_startup - Perform the standard automatic TPM initialization
- * sequence
- * @chip: TPM chip to use
- *
- * Returns 0 on success, < 0 in case of fatal error.
- */
-int tpm1_auto_startup(struct tpm_chip *chip)
-{
- int rc;
-
- rc = tpm_get_timeouts(chip);
- if (rc)
- goto out;
- rc = tpm_do_selftest(chip);
- if (rc) {
- dev_err(&chip->dev, "TPM self test failed\n");
- goto out;
- }
-
- return rc;
-out:
- if (rc > 0)
- rc = -ENODEV;
- return rc;
-}
-
/**
* tpm_send - send a TPM command
* @chip: a &struct tpm_chip instance, %NULL for the default chip
*/
int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen)
{
+ struct tpm_buf buf;
int rc;
chip = tpm_find_get_ops(chip);
if (!chip)
return -ENODEV;
- rc = tpm_transmit_cmd(chip, NULL, cmd, buflen, 0, 0,
+ rc = tpm_buf_init(&buf, 0, 0);
+ if (rc)
+ goto out;
+
+ memcpy(buf.data, cmd, buflen);
+ rc = tpm_transmit_cmd(chip, NULL, &buf, 0, 0,
"attempting to a send a command");
+ tpm_buf_destroy(&buf);
+out:
tpm_put_ops(chip);
return rc;
}
EXPORT_SYMBOL_GPL(tpm_send);
-#define TPM_ORD_SAVESTATE 152
-#define SAVESTATE_RESULT_SIZE 10
+int tpm_auto_startup(struct tpm_chip *chip)
+{
+ int rc;
+
+ if (!(chip->ops->flags & TPM_OPS_AUTO_STARTUP))
+ return 0;
-static const struct tpm_input_header savestate_header = {
- .tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
- .length = cpu_to_be32(10),
- .ordinal = cpu_to_be32(TPM_ORD_SAVESTATE)
-};
+ if (chip->flags & TPM_CHIP_FLAG_TPM2)
+ rc = tpm2_auto_startup(chip);
+ else
+ rc = tpm1_auto_startup(chip);
+
+ return rc;
+}
/*
* We are about to suspend. Save the TPM state
int tpm_pm_suspend(struct device *dev)
{
struct tpm_chip *chip = dev_get_drvdata(dev);
- struct tpm_cmd_t cmd;
- int rc, try;
-
- u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 };
+ int rc = 0;
- if (chip == NULL)
+ if (!chip)
return -ENODEV;
if (chip->flags & TPM_CHIP_FLAG_ALWAYS_POWERED)
return 0;
- if (chip->flags & TPM_CHIP_FLAG_TPM2) {
+ if (chip->flags & TPM_CHIP_FLAG_TPM2)
tpm2_shutdown(chip, TPM2_SU_STATE);
- return 0;
- }
-
- /* for buggy tpm, flush pcrs with extend to selected dummy */
- if (tpm_suspend_pcr)
- rc = tpm1_pcr_extend(chip, tpm_suspend_pcr, dummy_hash,
- "extending dummy pcr before suspend");
-
- /* now do the actual savestate */
- for (try = 0; try < TPM_RETRY; try++) {
- cmd.header.in = savestate_header;
- rc = tpm_transmit_cmd(chip, NULL, &cmd, SAVESTATE_RESULT_SIZE,
- 0, 0, NULL);
-
- /*
- * If the TPM indicates that it is too busy to respond to
- * this command then retry before giving up. It can take
- * several seconds for this TPM to be ready.
- *
- * This can happen if the TPM has already been sent the
- * SaveState command before the driver has loaded. TCG 1.2
- * specification states that any communication after SaveState
- * may cause the TPM to invalidate previously saved state.
- */
- if (rc != TPM_WARN_RETRY)
- break;
- tpm_msleep(TPM_TIMEOUT_RETRY);
- }
-
- if (rc)
- dev_err(&chip->dev,
- "Error (%d) sending savestate before suspend\n", rc);
- else if (try > 0)
- dev_warn(&chip->dev, "TPM savestate took %dms\n",
- try * TPM_TIMEOUT_RETRY);
+ else
+ rc = tpm1_pm_suspend(chip, tpm_suspend_pcr);
return rc;
}
}
EXPORT_SYMBOL_GPL(tpm_pm_resume);
-#define TPM_GETRANDOM_RESULT_SIZE 18
-static const struct tpm_input_header tpm_getrandom_header = {
- .tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
- .length = cpu_to_be32(14),
- .ordinal = cpu_to_be32(TPM_ORD_GET_RANDOM)
-};
-
/**
* 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
*
- * Return: same as with tpm_transmit_cmd()
+ * Return: number of random bytes read or a negative error value.
*/
int tpm_get_random(struct tpm_chip *chip, u8 *out, size_t max)
{
- 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;
- u8 *dest = out;
+ int rc;
- if (!out || !num_bytes || max > TPM_MAX_RNG_DATA)
+ if (!out || max > TPM_MAX_RNG_DATA)
return -EINVAL;
chip = tpm_find_get_ops(chip);
if (!chip)
return -ENODEV;
- if (chip->flags & TPM_CHIP_FLAG_TPM2) {
- err = tpm2_get_random(chip, out, max);
- tpm_put_ops(chip);
- return err;
- }
-
- do {
- tpm_cmd.header.in = tpm_getrandom_header;
- tpm_cmd.params.getrandom_in.num_bytes = cpu_to_be32(num_bytes);
-
- err = tpm_transmit_cmd(chip, NULL, &tpm_cmd,
- TPM_GETRANDOM_RESULT_SIZE + num_bytes,
- offsetof(struct tpm_getrandom_out,
- rng_data),
- 0, "attempting get random");
- if (err)
- break;
-
- recd = be32_to_cpu(tpm_cmd.params.getrandom_out.rng_data_len);
- if (recd > num_bytes) {
- total = -EFAULT;
- break;
- }
-
- rlength = be32_to_cpu(tpm_cmd.header.out.length);
- if (rlength < TPM_HEADER_SIZE +
- offsetof(struct tpm_getrandom_out, rng_data) +
- recd) {
- total = -EFAULT;
- break;
- }
- memcpy(dest, tpm_cmd.params.getrandom_out.rng_data, recd);
-
- dest += recd;
- total += recd;
- num_bytes -= recd;
- } while (retries-- && total < max);
+ if (chip->flags & TPM_CHIP_FLAG_TPM2)
+ rc = tpm2_get_random(chip, out, max);
+ else
+ rc = tpm1_get_random(chip, out, max);
tpm_put_ops(chip);
- return total ? total : -EIO;
+ return rc;
}
EXPORT_SYMBOL_GPL(tpm_get_random);
projects / linux.git / blobdiff