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tpm: vtpm_proxy: Implement request_locality function.

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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>
This commit is contained in:
Stefan Berger 2017-05-24 17:39:40 -04:00 committed by Jarkko Sakkinen
parent 85ab3bf305
commit be4c9acfe2
3 changed files with 41 additions and 0 deletions
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1
drivers/char/tpm/tpm-interface.c
View File

@ -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

36
drivers/char/tpm/tpm_vtpm_proxy.c
View File

@ -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,
};
/*

4
include/uapi/linux/vtpm_proxy.h
View File

@ -46,4 +46,8 @@ struct vtpm_proxy_new_dev {
#define VTPM_PROXY_IOC_NEW_DEV _IOWR(0xa1, 0x00, struct vtpm_proxy_new_dev)
/* vendor specific commands to set locality */
#define TPM2_CC_SET_LOCALITY 0x20001000
#define TPM_ORD_SET_LOCALITY 0x20001000
#endif /* _UAPI_LINUX_VTPM_PROXY_H */