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| author |   Stefan Berger <stefanb@linux.vnet.ibm.com> | 2017-05-24 17:39:40 -0400 |
|---|---|---|
| committer |   Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> | 2017-06-13 22:02:09 +0300 |
| commit | be4c9acfe2976b6e024d15656254d2eb207b83a8 (patch) | |
| tree | f06d321362ee2abdecb88530b5fb652fb67d3524 /drivers/char | |
| parent | tpm: Introduce flag TPM_TRANSMIT_RAW (diff) | |
| download | linux-dev-be4c9acfe2976b6e024d15656254d2eb207b83a8.tar.xz linux-dev-be4c9acfe2976b6e024d15656254d2eb207b83a8.zip | |
tpm: vtpm_proxy: Implement request_locality function.
Implement the request_locality function. To set the locality on the
backend we define vendor-specific TPM 1.2 and TPM 2 ordinals and send
a command to the backend to set the locality for the next commands.
To avoid recursing into requesting the locality, we set the
TPM_TRANSMIT_RAW flag when calling tpm_transmit_cmd. To avoid recursing
into TPM 2 space related commands, we set the space parameter to NULL.
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/tpm/tpm-interface.c | 1 | ||||
| -rw-r--r-- | drivers/char/tpm/tpm_vtpm_proxy.c | 36 |
2 files changed, 37 insertions, 0 deletions
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c index 8ef5e1723efb..d2b4df6d9894 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -538,6 +538,7 @@ ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_space *space, return 0; } +EXPORT_SYMBOL_GPL(tpm_transmit_cmd); #define TPM_DIGEST_SIZE 20 #define TPM_RET_CODE_IDX 6 diff --git a/drivers/char/tpm/tpm_vtpm_proxy.c b/drivers/char/tpm/tpm_vtpm_proxy.c index 751059d2140a..66024bf92097 100644 --- a/drivers/char/tpm/tpm_vtpm_proxy.c +++ b/drivers/char/tpm/tpm_vtpm_proxy.c @@ -371,6 +371,41 @@ static bool vtpm_proxy_tpm_req_canceled(struct tpm_chip *chip, u8 status) return ret; } +static int vtpm_proxy_request_locality(struct tpm_chip *chip, int locality) +{ + struct tpm_buf buf; + int rc; + const struct tpm_output_header *header; + + if (chip->flags & TPM_CHIP_FLAG_TPM2) + rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, + TPM2_CC_SET_LOCALITY); + else + rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, + TPM_ORD_SET_LOCALITY); + if (rc) + return rc; + tpm_buf_append_u8(&buf, locality); + + rc = tpm_transmit_cmd(chip, NULL, buf.data, tpm_buf_length(&buf), 0, + TPM_TRANSMIT_UNLOCKED | TPM_TRANSMIT_RAW, + "attempting to set locality"); + if (rc < 0) { + locality = rc; + goto out; + } + + header = (const struct tpm_output_header *)buf.data; + rc = be32_to_cpu(header->return_code); + if (rc) + locality = -1; + +out: + tpm_buf_destroy(&buf); + + return locality; +} + static const struct tpm_class_ops vtpm_proxy_tpm_ops = { .flags = TPM_OPS_AUTO_STARTUP, .recv = vtpm_proxy_tpm_op_recv, @@ -380,6 +415,7 @@ static const struct tpm_class_ops vtpm_proxy_tpm_ops = { .req_complete_mask = VTPM_PROXY_REQ_COMPLETE_FLAG, .req_complete_val = VTPM_PROXY_REQ_COMPLETE_FLAG, .req_canceled = vtpm_proxy_tpm_req_canceled, + .request_locality = vtpm_proxy_request_locality, }; /* |