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authorStefan Berger <stefanb@linux.vnet.ibm.com>2017-05-24 17:39:40 -0400
committerJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>2017-06-13 22:02:09 +0300
commitbe4c9acfe2976b6e024d15656254d2eb207b83a8 (patch)
treef06d321362ee2abdecb88530b5fb652fb67d3524
parent85ab3bf305b96e5f4c83b23a0b7e11d90144eb18 (diff)
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>
-rw-r--r--drivers/char/tpm/tpm-interface.c1
-rw-r--r--drivers/char/tpm/tpm_vtpm_proxy.c36
-rw-r--r--include/uapi/linux/vtpm_proxy.h4
3 files changed, 41 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,
};
/*
diff --git a/include/uapi/linux/vtpm_proxy.h b/include/uapi/linux/vtpm_proxy.h
index a69e991eb080..58ac73cd38fe 100644
--- a/include/uapi/linux/vtpm_proxy.h
+++ b/include/uapi/linux/vtpm_proxy.h
@@ -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 */