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path: root/drivers/char/tpm/tpm2-cmd.c
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Diffstat (limited to 'drivers/char/tpm/tpm2-cmd.c')
-rw-r--r--drivers/char/tpm/tpm2-cmd.c338
1 files changed, 229 insertions, 109 deletions
diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index da5b782a9731..881aea9732bf 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -53,22 +53,6 @@ struct tpm2_pcr_read_out {
u8 digest[TPM_DIGEST_SIZE];
} __packed;
-struct tpm2_null_auth_area {
- __be32 handle;
- __be16 nonce_size;
- u8 attributes;
- __be16 auth_size;
-} __packed;
-
-struct tpm2_pcr_extend_in {
- __be32 pcr_idx;
- __be32 auth_area_size;
- struct tpm2_null_auth_area auth_area;
- __be32 digest_cnt;
- __be16 hash_alg;
- u8 digest[TPM_DIGEST_SIZE];
-} __packed;
-
struct tpm2_get_tpm_pt_in {
__be32 cap_id;
__be32 property_id;
@@ -97,7 +81,6 @@ union tpm2_cmd_params {
struct tpm2_self_test_in selftest_in;
struct tpm2_pcr_read_in pcrread_in;
struct tpm2_pcr_read_out pcrread_out;
- struct tpm2_pcr_extend_in pcrextend_in;
struct tpm2_get_tpm_pt_in get_tpm_pt_in;
struct tpm2_get_tpm_pt_out get_tpm_pt_out;
struct tpm2_get_random_in getrandom_in;
@@ -248,6 +231,9 @@ static const u8 tpm2_ordinal_duration[TPM2_CC_LAST - TPM2_CC_FIRST + 1] = {
(sizeof(struct tpm_input_header) + \
sizeof(struct tpm2_pcr_read_in))
+#define TPM2_PCR_READ_RESP_BODY_SIZE \
+ sizeof(struct tpm2_pcr_read_out)
+
static const struct tpm_input_header tpm2_pcrread_header = {
.tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
.length = cpu_to_be32(TPM2_PCR_READ_IN_SIZE),
@@ -258,11 +244,9 @@ static const struct tpm_input_header tpm2_pcrread_header = {
* tpm2_pcr_read() - read a PCR value
* @chip: TPM chip to use.
* @pcr_idx: index of the PCR to read.
- * @ref_buf: buffer to store the resulting hash,
+ * @res_buf: buffer to store the resulting hash.
*
- * 0 is returned when the operation is successful. If a negative number is
- * returned it remarks a POSIX error code. If a positive number is returned
- * it remarks a TPM error.
+ * Return: Same as with tpm_transmit_cmd.
*/
int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
{
@@ -282,8 +266,9 @@ int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
sizeof(cmd.params.pcrread_in.pcr_select));
cmd.params.pcrread_in.pcr_select[pcr_idx >> 3] = 1 << (pcr_idx & 0x7);
- rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0,
- "attempting to read a pcr value");
+ rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd),
+ TPM2_PCR_READ_RESP_BODY_SIZE,
+ 0, "attempting to read a pcr value");
if (rc == 0) {
buf = cmd.params.pcrread_out.digest;
memcpy(res_buf, buf, TPM_DIGEST_SIZE);
@@ -292,50 +277,71 @@ int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
return rc;
}
-#define TPM2_GET_PCREXTEND_IN_SIZE \
- (sizeof(struct tpm_input_header) + \
- sizeof(struct tpm2_pcr_extend_in))
-
-static const struct tpm_input_header tpm2_pcrextend_header = {
- .tag = cpu_to_be16(TPM2_ST_SESSIONS),
- .length = cpu_to_be32(TPM2_GET_PCREXTEND_IN_SIZE),
- .ordinal = cpu_to_be32(TPM2_CC_PCR_EXTEND)
-};
+struct tpm2_null_auth_area {
+ __be32 handle;
+ __be16 nonce_size;
+ u8 attributes;
+ __be16 auth_size;
+} __packed;
/**
* tpm2_pcr_extend() - extend a PCR value
+ *
* @chip: TPM chip to use.
* @pcr_idx: index of the PCR.
- * @hash: hash value to use for the extend operation.
+ * @count: number of digests passed.
+ * @digests: list of pcr banks and corresponding digest values to extend.
*
- * 0 is returned when the operation is successful. If a negative number is
- * returned it remarks a POSIX error code. If a positive number is returned
- * it remarks a TPM error.
+ * Return: Same as with tpm_transmit_cmd.
*/
-int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash)
+int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, u32 count,
+ struct tpm2_digest *digests)
{
- struct tpm2_cmd cmd;
+ struct tpm_buf buf;
+ struct tpm2_null_auth_area auth_area;
int rc;
+ int i;
+ int j;
+
+ if (count > ARRAY_SIZE(chip->active_banks))
+ return -EINVAL;
+
+ rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_PCR_EXTEND);
+ if (rc)
+ return rc;
+
+ tpm_buf_append_u32(&buf, pcr_idx);
+
+ auth_area.handle = cpu_to_be32(TPM2_RS_PW);
+ auth_area.nonce_size = 0;
+ auth_area.attributes = 0;
+ auth_area.auth_size = 0;
+
+ tpm_buf_append_u32(&buf, sizeof(struct tpm2_null_auth_area));
+ tpm_buf_append(&buf, (const unsigned char *)&auth_area,
+ sizeof(auth_area));
+ tpm_buf_append_u32(&buf, count);
+
+ for (i = 0; i < count; i++) {
+ for (j = 0; j < ARRAY_SIZE(tpm2_hash_map); j++) {
+ if (digests[i].alg_id != tpm2_hash_map[j].tpm_id)
+ continue;
+ tpm_buf_append_u16(&buf, digests[i].alg_id);
+ tpm_buf_append(&buf, (const unsigned char
+ *)&digests[i].digest,
+ hash_digest_size[tpm2_hash_map[j].crypto_id]);
+ }
+ }
- cmd.header.in = tpm2_pcrextend_header;
- cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
- cmd.params.pcrextend_in.auth_area_size =
- cpu_to_be32(sizeof(struct tpm2_null_auth_area));
- cmd.params.pcrextend_in.auth_area.handle =
- cpu_to_be32(TPM2_RS_PW);
- cmd.params.pcrextend_in.auth_area.nonce_size = 0;
- cmd.params.pcrextend_in.auth_area.attributes = 0;
- cmd.params.pcrextend_in.auth_area.auth_size = 0;
- cmd.params.pcrextend_in.digest_cnt = cpu_to_be32(1);
- cmd.params.pcrextend_in.hash_alg = cpu_to_be16(TPM2_ALG_SHA1);
- memcpy(cmd.params.pcrextend_in.digest, hash, TPM_DIGEST_SIZE);
-
- rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0,
+ rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, 0, 0,
"attempting extend a PCR value");
+ tpm_buf_destroy(&buf);
+
return rc;
}
+
#define TPM2_GETRANDOM_IN_SIZE \
(sizeof(struct tpm_input_header) + \
sizeof(struct tpm2_get_random_in))
@@ -348,18 +354,18 @@ static const struct tpm_input_header tpm2_getrandom_header = {
/**
* tpm2_get_random() - get random bytes from the TPM RNG
+ *
* @chip: TPM chip to use
* @out: destination buffer for the random bytes
* @max: the max number of bytes to write to @out
*
- * 0 is returned when the operation is successful. If a negative number is
- * returned it remarks a POSIX error code. If a positive number is returned
- * it remarks a TPM error.
+ * Return:
+ * Size of the output buffer, or -EIO on error.
*/
int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max)
{
struct tpm2_cmd cmd;
- u32 recd;
+ u32 recd, rlength;
u32 num_bytes;
int err;
int total = 0;
@@ -376,13 +382,19 @@ int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max)
cmd.header.in = tpm2_getrandom_header;
cmd.params.getrandom_in.size = cpu_to_be16(num_bytes);
- err = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0,
- "attempting get random");
+ err = tpm_transmit_cmd(chip, &cmd, sizeof(cmd),
+ offsetof(struct tpm2_get_random_out,
+ buffer),
+ 0, "attempting get random");
if (err)
break;
recd = min_t(u32, be16_to_cpu(cmd.params.getrandom_out.size),
num_bytes);
+ rlength = be32_to_cpu(cmd.header.out.length);
+ if (rlength < offsetof(struct tpm2_get_random_out, buffer) +
+ recd)
+ return -EFAULT;
memcpy(dest, cmd.params.getrandom_out.buffer, recd);
dest += recd;
@@ -397,6 +409,9 @@ int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max)
(sizeof(struct tpm_input_header) + \
sizeof(struct tpm2_get_tpm_pt_in))
+#define TPM2_GET_TPM_PT_OUT_BODY_SIZE \
+ sizeof(struct tpm2_get_tpm_pt_out)
+
static const struct tpm_input_header tpm2_get_tpm_pt_header = {
.tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
.length = cpu_to_be32(TPM2_GET_TPM_PT_IN_SIZE),
@@ -404,15 +419,15 @@ static const struct tpm_input_header tpm2_get_tpm_pt_header = {
};
/**
- * Append TPMS_AUTH_COMMAND to the buffer. The buffer must be allocated with
- * tpm_buf_alloc().
- *
- * @param buf: an allocated tpm_buf instance
- * @param nonce: the session nonce, may be NULL if not used
- * @param nonce_len: the session nonce length, may be 0 if not used
- * @param attributes: the session attributes
- * @param hmac: the session HMAC or password, may be NULL if not used
- * @param hmac_len: the session HMAC or password length, maybe 0 if not used
+ * tpm_buf_append_auth() - append TPMS_AUTH_COMMAND to the buffer.
+ *
+ * @buf: an allocated tpm_buf instance
+ * @session_handle: session handle
+ * @nonce: the session nonce, may be NULL if not used
+ * @nonce_len: the session nonce length, may be 0 if not used
+ * @attributes: the session attributes
+ * @hmac: the session HMAC or password, may be NULL if not used
+ * @hmac_len: the session HMAC or password length, maybe 0 if not used
*/
static void tpm2_buf_append_auth(struct tpm_buf *buf, u32 session_handle,
const u8 *nonce, u16 nonce_len,
@@ -435,7 +450,8 @@ static void tpm2_buf_append_auth(struct tpm_buf *buf, u32 session_handle,
/**
* tpm2_seal_trusted() - seal the payload of a trusted key
- * @chip_num: TPM chip to use
+ *
+ * @chip: TPM chip to use
* @payload: the key data in clear and encrypted form
* @options: authentication values and other options
*
@@ -447,7 +463,7 @@ int tpm2_seal_trusted(struct tpm_chip *chip,
{
unsigned int blob_len;
struct tpm_buf buf;
- u32 hash;
+ u32 hash, rlength;
int i;
int rc;
@@ -512,7 +528,8 @@ int tpm2_seal_trusted(struct tpm_chip *chip,
goto out;
}
- rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, 0, "sealing data");
+ rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, 4, 0,
+ "sealing data");
if (rc)
goto out;
@@ -521,6 +538,11 @@ int tpm2_seal_trusted(struct tpm_chip *chip,
rc = -E2BIG;
goto out;
}
+ rlength = be32_to_cpu(((struct tpm2_cmd *)&buf)->header.out.length);
+ if (rlength < TPM_HEADER_SIZE + 4 + blob_len) {
+ rc = -EFAULT;
+ goto out;
+ }
memcpy(payload->blob, &buf.data[TPM_HEADER_SIZE + 4], blob_len);
payload->blob_len = blob_len;
@@ -529,7 +551,7 @@ out:
tpm_buf_destroy(&buf);
if (rc > 0) {
- if ((rc & TPM2_RC_HASH) == TPM2_RC_HASH)
+ if (tpm2_rc_value(rc) == TPM2_RC_HASH)
rc = -EINVAL;
else
rc = -EPERM;
@@ -540,11 +562,17 @@ out:
/**
* tpm2_load_cmd() - execute a TPM2_Load command
- * @chip_num: TPM chip to use
+ *
+ * @chip: TPM chip to use
* @payload: the key data in clear and encrypted form
* @options: authentication values and other options
+ * @blob_handle: returned blob handle
+ * @flags: tpm transmit flags
*
- * Return: same as with tpm_transmit_cmd
+ * Return: 0 on success.
+ * -E2BIG on wrong payload size.
+ * -EPERM on tpm error status.
+ * < 0 error from tpm_transmit_cmd.
*/
static int tpm2_load_cmd(struct tpm_chip *chip,
struct trusted_key_payload *payload,
@@ -584,7 +612,8 @@ static int tpm2_load_cmd(struct tpm_chip *chip,
goto out;
}
- rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, flags, "loading blob");
+ rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, 4, flags,
+ "loading blob");
if (!rc)
*blob_handle = be32_to_cpup(
(__be32 *) &buf.data[TPM_HEADER_SIZE]);
@@ -600,11 +629,12 @@ out:
/**
* tpm2_flush_context_cmd() - execute a TPM2_FlushContext command
- * @chip_num: TPM chip to use
- * @payload: the key data in clear and encrypted form
- * @options: authentication values and other options
*
- * Return: same as with tpm_transmit_cmd
+ * @chip: TPM chip to use
+ * @handle: the key data in clear and encrypted form
+ * @flags: tpm transmit flags
+ *
+ * Return: Same as with tpm_transmit_cmd.
*/
static void tpm2_flush_context_cmd(struct tpm_chip *chip, u32 handle,
unsigned int flags)
@@ -621,7 +651,7 @@ static void tpm2_flush_context_cmd(struct tpm_chip *chip, u32 handle,
tpm_buf_append_u32(&buf, handle);
- rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, flags,
+ rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, 0, flags,
"flushing context");
if (rc)
dev_warn(&chip->dev, "0x%08x was not flushed, rc=%d\n", handle,
@@ -632,11 +662,16 @@ static void tpm2_flush_context_cmd(struct tpm_chip *chip, u32 handle,
/**
* tpm2_unseal_cmd() - execute a TPM2_Unload command
- * @chip_num: TPM chip to use
+ *
+ * @chip: TPM chip to use
* @payload: the key data in clear and encrypted form
* @options: authentication values and other options
+ * @blob_handle: blob handle
+ * @flags: tpm_transmit_cmd flags
*
- * Return: same as with tpm_transmit_cmd
+ * Return: 0 on success
+ * -EPERM on tpm error status
+ * < 0 error from tpm_transmit_cmd
*/
static int tpm2_unseal_cmd(struct tpm_chip *chip,
struct trusted_key_payload *payload,
@@ -647,6 +682,7 @@ static int tpm2_unseal_cmd(struct tpm_chip *chip,
u16 data_len;
u8 *data;
int rc;
+ u32 rlength;
rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_UNSEAL);
if (rc)
@@ -661,13 +697,21 @@ static int tpm2_unseal_cmd(struct tpm_chip *chip,
options->blobauth /* hmac */,
TPM_DIGEST_SIZE);
- rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, flags, "unsealing");
+ rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, 6, flags,
+ "unsealing");
if (rc > 0)
rc = -EPERM;
if (!rc) {
data_len = be16_to_cpup(
(__be16 *) &buf.data[TPM_HEADER_SIZE + 4]);
+
+ rlength = be32_to_cpu(((struct tpm2_cmd *)&buf)
+ ->header.out.length);
+ if (rlength < TPM_HEADER_SIZE + 6 + data_len) {
+ rc = -EFAULT;
+ goto out;
+ }
data = &buf.data[TPM_HEADER_SIZE + 6];
memcpy(payload->key, data, data_len - 1);
@@ -675,17 +719,19 @@ static int tpm2_unseal_cmd(struct tpm_chip *chip,
payload->migratable = data[data_len - 1];
}
+out:
tpm_buf_destroy(&buf);
return rc;
}
/**
* tpm2_unseal_trusted() - unseal the payload of a trusted key
- * @chip_num: TPM chip to use
+ *
+ * @chip: TPM chip to use
* @payload: the key data in clear and encrypted form
* @options: authentication values and other options
*
- * Return: < 0 on error and 0 on success.
+ * Return: Same as with tpm_transmit_cmd.
*/
int tpm2_unseal_trusted(struct tpm_chip *chip,
struct trusted_key_payload *payload,
@@ -715,9 +761,7 @@ out:
* @value: output variable.
* @desc: passed to tpm_transmit_cmd()
*
- * 0 is returned when the operation is successful. If a negative number is
- * returned it remarks a POSIX error code. If a positive number is returned
- * it remarks a TPM error.
+ * Return: Same as with tpm_transmit_cmd.
*/
ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id, u32 *value,
const char *desc)
@@ -730,7 +774,8 @@ ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id, u32 *value,
cmd.params.get_tpm_pt_in.property_id = cpu_to_be32(property_id);
cmd.params.get_tpm_pt_in.property_cnt = cpu_to_be32(1);
- rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0, desc);
+ rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd),
+ TPM2_GET_TPM_PT_OUT_BODY_SIZE, 0, desc);
if (!rc)
*value = be32_to_cpu(cmd.params.get_tpm_pt_out.value);
@@ -750,13 +795,12 @@ static const struct tpm_input_header tpm2_startup_header = {
/**
* tpm2_startup() - send startup command to the TPM chip
+ *
* @chip: TPM chip to use.
- * @startup_type startup type. The value is either
+ * @startup_type: startup type. The value is either
* TPM_SU_CLEAR or TPM_SU_STATE.
*
- * 0 is returned when the operation is successful. If a negative number is
- * returned it remarks a POSIX error code. If a positive number is returned
- * it remarks a TPM error.
+ * Return: Same as with tpm_transmit_cmd.
*/
static int tpm2_startup(struct tpm_chip *chip, u16 startup_type)
{
@@ -765,7 +809,7 @@ static int tpm2_startup(struct tpm_chip *chip, u16 startup_type)
cmd.header.in = tpm2_startup_header;
cmd.params.startup_in.startup_type = cpu_to_be16(startup_type);
- return tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0,
+ return tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0, 0,
"attempting to start the TPM");
}
@@ -781,8 +825,9 @@ static const struct tpm_input_header tpm2_shutdown_header = {
/**
* tpm2_shutdown() - send shutdown command to the TPM chip
+ *
* @chip: TPM chip to use.
- * @shutdown_type shutdown type. The value is either
+ * @shutdown_type: shutdown type. The value is either
* TPM_SU_CLEAR or TPM_SU_STATE.
*/
void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type)
@@ -793,7 +838,8 @@ void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type)
cmd.header.in = tpm2_shutdown_header;
cmd.params.startup_in.startup_type = cpu_to_be16(shutdown_type);
- rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0, "stopping the TPM");
+ rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0, 0,
+ "stopping the TPM");
/* In places where shutdown command is sent there's no much we can do
* except print the error code on a system failure.
@@ -805,12 +851,11 @@ void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type)
/*
* tpm2_calc_ordinal_duration() - maximum duration for a command
+ *
* @chip: TPM chip to use.
* @ordinal: command code number.
*
- * 0 is returned when the operation is successful. If a negative number is
- * returned it remarks a POSIX error code. If a positive number is returned
- * it remarks a TPM error.
+ * Return: maximum duration for a command
*/
unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal)
{
@@ -842,13 +887,12 @@ static const struct tpm_input_header tpm2_selftest_header = {
/**
* tpm2_continue_selftest() - start a self test
+ *
* @chip: TPM chip to use
* @full: test all commands instead of testing only those that were not
* previously tested.
*
- * 0 is returned when the operation is successful. If a negative number is
- * returned it remarks a POSIX error code. If a positive number is returned
- * it remarks a TPM error.
+ * Return: Same as with tpm_transmit_cmd with exception of RC_TESTING.
*/
static int tpm2_start_selftest(struct tpm_chip *chip, bool full)
{
@@ -858,7 +902,7 @@ static int tpm2_start_selftest(struct tpm_chip *chip, bool full)
cmd.header.in = tpm2_selftest_header;
cmd.params.selftest_in.full_test = full;
- rc = tpm_transmit_cmd(chip, &cmd, TPM2_SELF_TEST_IN_SIZE, 0,
+ rc = tpm_transmit_cmd(chip, &cmd, TPM2_SELF_TEST_IN_SIZE, 0, 0,
"continue selftest");
/* At least some prototype chips seem to give RC_TESTING error
@@ -874,14 +918,13 @@ static int tpm2_start_selftest(struct tpm_chip *chip, bool full)
/**
* tpm2_do_selftest() - run a full self test
+ *
* @chip: TPM chip to use
*
+ * Return: Same as with tpm_transmit_cmd.
+ *
* During the self test TPM2 commands return with the error code RC_TESTING.
* Waiting is done by issuing PCR read until it executes successfully.
- *
- * 0 is returned when the operation is successful. If a negative number is
- * returned it remarks a POSIX error code. If a positive number is returned
- * it remarks a TPM error.
*/
static int tpm2_do_selftest(struct tpm_chip *chip)
{
@@ -910,7 +953,7 @@ static int tpm2_do_selftest(struct tpm_chip *chip)
cmd.params.pcrread_in.pcr_select[1] = 0x00;
cmd.params.pcrread_in.pcr_select[2] = 0x00;
- rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0, NULL);
+ rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0, 0, NULL);
if (rc < 0)
break;
@@ -928,6 +971,8 @@ static int tpm2_do_selftest(struct tpm_chip *chip)
* tpm2_probe() - probe TPM 2.0
* @chip: TPM chip to use
*
+ * Return: < 0 error and 0 on success.
+ *
* Send idempotent TPM 2.0 command and see whether TPM 2.0 chip replied based on
* the reply tag.
*/
@@ -941,7 +986,7 @@ int tpm2_probe(struct tpm_chip *chip)
cmd.params.get_tpm_pt_in.property_id = cpu_to_be32(0x100);
cmd.params.get_tpm_pt_in.property_cnt = cpu_to_be32(1);
- rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0, NULL);
+ rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0, 0, NULL);
if (rc < 0)
return rc;
@@ -952,12 +997,85 @@ int tpm2_probe(struct tpm_chip *chip)
}
EXPORT_SYMBOL_GPL(tpm2_probe);
+struct tpm2_pcr_selection {
+ __be16 hash_alg;
+ u8 size_of_select;
+ u8 pcr_select[3];
+} __packed;
+
+static ssize_t tpm2_get_pcr_allocation(struct tpm_chip *chip)
+{
+ struct tpm2_pcr_selection pcr_selection;
+ struct tpm_buf buf;
+ void *marker;
+ void *end;
+ void *pcr_select_offset;
+ unsigned int count;
+ u32 sizeof_pcr_selection;
+ u32 rsp_len;
+ int rc;
+ int i = 0;
+
+ rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_GET_CAPABILITY);
+ if (rc)
+ return rc;
+
+ tpm_buf_append_u32(&buf, TPM2_CAP_PCRS);
+ tpm_buf_append_u32(&buf, 0);
+ tpm_buf_append_u32(&buf, 1);
+
+ rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, 9, 0,
+ "get tpm pcr allocation");
+ if (rc)
+ goto out;
+
+ count = be32_to_cpup(
+ (__be32 *)&buf.data[TPM_HEADER_SIZE + 5]);
+
+ if (count > ARRAY_SIZE(chip->active_banks)) {
+ rc = -ENODEV;
+ goto out;
+ }
+
+ marker = &buf.data[TPM_HEADER_SIZE + 9];
+
+ rsp_len = be32_to_cpup((__be32 *)&buf.data[2]);
+ end = &buf.data[rsp_len];
+
+ for (i = 0; i < count; i++) {
+ pcr_select_offset = marker +
+ offsetof(struct tpm2_pcr_selection, size_of_select);
+ if (pcr_select_offset >= end) {
+ rc = -EFAULT;
+ break;
+ }
+
+ memcpy(&pcr_selection, marker, sizeof(pcr_selection));
+ chip->active_banks[i] = be16_to_cpu(pcr_selection.hash_alg);
+ sizeof_pcr_selection = sizeof(pcr_selection.hash_alg) +
+ sizeof(pcr_selection.size_of_select) +
+ pcr_selection.size_of_select;
+ marker = marker + sizeof_pcr_selection;
+ }
+
+out:
+ if (i < ARRAY_SIZE(chip->active_banks))
+ chip->active_banks[i] = TPM2_ALG_ERROR;
+
+ tpm_buf_destroy(&buf);
+
+ return rc;
+}
+
/**
* tpm2_auto_startup - Perform the standard automatic TPM initialization
* sequence
* @chip: TPM chip to use
*
- * Returns 0 on success, < 0 in case of fatal error.
+ * Initializes timeout values for operation and command durations, conducts
+ * a self-test and reads the list of active PCR banks.
+ *
+ * Return: 0 on success. Otherwise, a system error code is returned.
*/
int tpm2_auto_startup(struct tpm_chip *chip)
{
@@ -985,6 +1103,8 @@ int tpm2_auto_startup(struct tpm_chip *chip)
}
}
+ rc = tpm2_get_pcr_allocation(chip);
+
out:
if (rc > 0)
rc = -ENODEV;