From 19cbe4f680b48f950246815b891a66eeb67f7410 Mon Sep 17 00:00:00 2001 From: Jarkko Sakkinen Date: Wed, 21 Jun 2017 09:31:34 +0200 Subject: [PATCH] tpm: consolidate the TPM startup code Consolidated all the "manual" TPM startup code to a single function in order to make code flows a bit cleaner and migrate to tpm_buf. Tested-by: Stefan Berger Signed-off-by: Jarkko Sakkinen Signed-off-by: James Morris --- drivers/char/tpm/tpm-interface.c | 67 ++++++++++++++++++++------------ drivers/char/tpm/tpm.h | 6 +-- drivers/char/tpm/tpm2-cmd.c | 32 +-------------- 3 files changed, 44 insertions(+), 61 deletions(-) diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c index d2b4df6d9894..3123a6e44687 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -540,6 +540,47 @@ ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_space *space, } 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 @@ -586,27 +627,6 @@ ssize_t tpm_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap, } EXPORT_SYMBOL_GPL(tpm_getcap); -#define TPM_ORD_STARTUP 153 -#define TPM_ST_CLEAR cpu_to_be16(1) -#define TPM_ST_STATE cpu_to_be16(2) -#define TPM_ST_DEACTIVATED cpu_to_be16(3) -static const struct tpm_input_header tpm_startup_header = { - .tag = cpu_to_be16(TPM_TAG_RQU_COMMAND), - .length = cpu_to_be32(12), - .ordinal = cpu_to_be32(TPM_ORD_STARTUP) -}; - -static int tpm_startup(struct tpm_chip *chip, __be16 startup_type) -{ - struct tpm_cmd_t start_cmd; - start_cmd.header.in = tpm_startup_header; - - start_cmd.params.startup_in.startup_type = startup_type; - return tpm_transmit_cmd(chip, NULL, &start_cmd, - TPM_INTERNAL_RESULT_SIZE, 0, - 0, "attempting to start the TPM"); -} - int tpm_get_timeouts(struct tpm_chip *chip) { cap_t cap; @@ -636,10 +656,7 @@ int tpm_get_timeouts(struct tpm_chip *chip) rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, NULL, sizeof(cap.timeout)); if (rc == TPM_ERR_INVALID_POSTINIT) { - /* The TPM is not started, we are the first to talk to it. - Execute a startup command. */ - dev_info(&chip->dev, "Issuing TPM_STARTUP\n"); - if (tpm_startup(chip, TPM_ST_CLEAR)) + if (tpm_startup(chip)) return rc; rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index cdd261383dea..71d661a60df2 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -382,10 +382,6 @@ struct tpm_getrandom_in { __be32 num_bytes; } __packed; -struct tpm_startup_in { - __be16 startup_type; -} __packed; - typedef union { struct tpm_readpubek_params_out readpubek_out; u8 readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)]; @@ -393,7 +389,6 @@ typedef union { struct tpm_pcrread_out pcrread_out; struct tpm_getrandom_in getrandom_in; struct tpm_getrandom_out getrandom_out; - struct tpm_startup_in startup_in; } tpm_cmd_params; struct tpm_cmd_t { @@ -519,6 +514,7 @@ ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_space *space, const void *buf, size_t bufsiz, size_t min_rsp_body_length, unsigned int flags, const char *desc); +int tpm_startup(struct tpm_chip *chip); ssize_t tpm_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap, const char *desc, size_t min_cap_length); int tpm_get_timeouts(struct tpm_chip *); diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c index 3a9964326279..1962c9b15cd5 100644 --- a/drivers/char/tpm/tpm2-cmd.c +++ b/drivers/char/tpm/tpm2-cmd.c @@ -779,36 +779,6 @@ ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id, u32 *value, } EXPORT_SYMBOL_GPL(tpm2_get_tpm_pt); -#define TPM2_STARTUP_IN_SIZE \ - (sizeof(struct tpm_input_header) + \ - sizeof(struct tpm2_startup_in)) - -static const struct tpm_input_header tpm2_startup_header = { - .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS), - .length = cpu_to_be32(TPM2_STARTUP_IN_SIZE), - .ordinal = cpu_to_be32(TPM2_CC_STARTUP) -}; - -/** - * tpm2_startup() - send startup command to the TPM chip - * - * @chip: TPM chip to use. - * @startup_type: startup type. The value is either - * TPM_SU_CLEAR or TPM_SU_STATE. - * - * Return: Same as with tpm_transmit_cmd. - */ -static int tpm2_startup(struct tpm_chip *chip, u16 startup_type) -{ - struct tpm2_cmd cmd; - - cmd.header.in = tpm2_startup_header; - - cmd.params.startup_in.startup_type = cpu_to_be16(startup_type); - return tpm_transmit_cmd(chip, NULL, &cmd, sizeof(cmd), 0, 0, - "attempting to start the TPM"); -} - #define TPM2_SHUTDOWN_IN_SIZE \ (sizeof(struct tpm_input_header) + \ sizeof(struct tpm2_startup_in)) @@ -1150,7 +1120,7 @@ int tpm2_auto_startup(struct tpm_chip *chip) } if (rc == TPM2_RC_INITIALIZE) { - rc = tpm2_startup(chip, TPM2_SU_CLEAR); + rc = tpm_startup(chip); if (rc) goto out; -- 2.20.1