Messages in this thread Patch in this message |  | | From | Jarkko Sakkinen <> | Subject | [PATCH RFC 2/2] tpm: refactor tpm2_get_tpm_pt to tpm2_getcap_cmd | Date | Sun, 9 Oct 2016 13:14:16 +0300 |
| |
Refactored tpm2_get_tpm_pt to tpm2_getcap_cmd, which means that it also takes capability ID as input. This is required to access TPM_CAP_HANDLES, which contains metadata needed for swapping transient data.
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> --- drivers/char/tpm/tpm.h | 6 +++- drivers/char/tpm/tpm2-cmd.c | 64 ++++++++++++++++++++--------------------- drivers/char/tpm/tpm_tis_core.c | 3 +- 3 files changed, 38 insertions(+), 35 deletions(-)
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index 0fab6d5..8176f42 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -85,6 +85,10 @@ enum tpm2_capabilities { TPM2_CAP_TPM_PROPERTIES = 6, }; +enum tpm2_properties { + TPM2_PT_FAMILY_INDICATOR = 0x100, +}; + enum tpm2_startup_types { TPM2_SU_CLEAR = 0x0000, TPM2_SU_STATE = 0x0001, @@ -485,7 +489,7 @@ int tpm2_seal_trusted(struct tpm_chip *chip, int tpm2_unseal_trusted(struct tpm_chip *chip, struct trusted_key_payload *payload, struct trusted_key_options *options); -ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id, +ssize_t tpm2_getcap_cmd(struct tpm_chip *chip, u32 cap_id, u32 property_id, u32 *value, const char *desc); int tpm2_auto_startup(struct tpm_chip *chip); diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c index 2900e18..fcf3d86 100644 --- a/drivers/char/tpm/tpm2-cmd.c +++ b/drivers/char/tpm/tpm2-cmd.c @@ -111,13 +111,13 @@ struct tpm2_pcr_extend_in { u8 digest[TPM_DIGEST_SIZE]; } __packed; -struct tpm2_get_tpm_pt_in { +struct tpm2_getcap_in { __be32 cap_id; __be32 property_id; __be32 property_cnt; } __packed; -struct tpm2_get_tpm_pt_out { +struct tpm2_getcap_out { u8 more_data; __be32 subcap_id; __be32 property_cnt; @@ -140,8 +140,8 @@ union tpm2_cmd_params { 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_getcap_in getcap_in; + struct tpm2_getcap_out getcap_out; struct tpm2_get_random_in getrandom_in; struct tpm2_get_random_out getrandom_out; }; @@ -435,16 +435,6 @@ int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max) return total ? total : -EIO; } -#define TPM2_GET_TPM_PT_IN_SIZE \ - (sizeof(struct tpm_input_header) + \ - sizeof(struct tpm2_get_tpm_pt_in)) - -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), - .ordinal = cpu_to_be32(TPM2_CC_GET_CAPABILITY) -}; - /** * Append TPMS_AUTH_COMMAND to the buffer. The buffer must be allocated with * tpm_buf_alloc(). @@ -750,35 +740,43 @@ out: return rc; } +#define TPM2_GETCAP_IN_SIZE \ + (sizeof(struct tpm_input_header) + sizeof(struct tpm2_getcap_in)) + +static const struct tpm_input_header tpm2_getcap_header = { + .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS), + .length = cpu_to_be32(TPM2_GETCAP_IN_SIZE), + .ordinal = cpu_to_be32(TPM2_CC_GET_CAPABILITY) +}; + /** - * tpm2_get_tpm_pt() - get value of a TPM_CAP_TPM_PROPERTIES type property - * @chip: TPM chip to use. - * @property_id: property ID. - * @value: output variable. + * tpm2_getcap_cmd() - execute a TPM2_GetCapability command + * @chip: TPM chip to use + * @cap_id: capability ID + * @property_id: property ID + * @value: value of the property * @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) +ssize_t tpm2_getcap_cmd(struct tpm_chip *chip, u32 cap_id, u32 property_id, + u32 *value, const char *desc) { struct tpm2_cmd cmd; int rc; - cmd.header.in = tpm2_get_tpm_pt_header; - cmd.params.get_tpm_pt_in.cap_id = cpu_to_be32(TPM2_CAP_TPM_PROPERTIES); - 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); + cmd.header.in = tpm2_getcap_header; + cmd.params.getcap_in.cap_id = cpu_to_be32(cap_id); + cmd.params.getcap_in.property_id = cpu_to_be32(property_id); + cmd.params.getcap_in.property_cnt = cpu_to_be32(1); rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0, desc); if (!rc) - *value = be32_to_cpu(cmd.params.get_tpm_pt_out.value); + *value = be32_to_cpu(cmd.params.getcap_out.value); return rc; } -EXPORT_SYMBOL_GPL(tpm2_get_tpm_pt); +EXPORT_SYMBOL_GPL(tpm2_getcap_cmd); #define TPM2_STARTUP_IN_SIZE \ (sizeof(struct tpm_input_header) + \ @@ -978,10 +976,10 @@ int tpm2_probe(struct tpm_chip *chip) struct tpm2_cmd cmd; int rc; - cmd.header.in = tpm2_get_tpm_pt_header; - cmd.params.get_tpm_pt_in.cap_id = cpu_to_be32(TPM2_CAP_TPM_PROPERTIES); - cmd.params.get_tpm_pt_in.property_id = cpu_to_be32(0x100); - cmd.params.get_tpm_pt_in.property_cnt = cpu_to_be32(1); + cmd.header.in = tpm2_getcap_header; + cmd.params.getcap_in.cap_id = cpu_to_be32(TPM2_CAP_TPM_PROPERTIES); + cmd.params.getcap_in.property_id = cpu_to_be32(TPM2_PT_FAMILY_INDICATOR); + cmd.params.getcap_in.property_cnt = cpu_to_be32(1); rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0, NULL); if (rc < 0) diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c index e3bf31b..792ccd1 100644 --- a/drivers/char/tpm/tpm_tis_core.c +++ b/drivers/char/tpm/tpm_tis_core.c @@ -528,7 +528,8 @@ static int tpm_tis_gen_interrupt(struct tpm_chip *chip) cap_t cap; if (chip->flags & TPM_CHIP_FLAG_TPM2) - return tpm2_get_tpm_pt(chip, 0x100, &cap2, desc); + return tpm2_getcap_cmd(chip, TPM2_CAP_TPM_PROPERTIES, + TPM2_PT_FAMILY_INDICATOR, &cap2, desc); else return tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, desc); } -- 2.7.4
|  |