@@ -117,6 +117,24 @@ static long dbc_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
goto unlock;
}
break;
+ case DBCIOCUID:
+ dbc_dev->mbox->req.header.payload_size = sizeof(dbc_dev->mbox->dbc_set_uid);
+ if (copy_from_user(&dbc_dev->mbox->dbc_set_uid.user, argp,
+ sizeof(struct dbc_user_setuid))) {
+ ret = -EFAULT;
+ goto unlock;
+ }
+
+ ret = send_dbc_cmd(dbc_dev, PSP_DYNAMIC_BOOST_SET_UID);
+ if (ret)
+ goto unlock;
+
+ if (copy_to_user(argp, &dbc_dev->mbox->dbc_set_uid.user,
+ sizeof(struct dbc_user_setuid))) {
+ ret = -EFAULT;
+ goto unlock;
+ }
+ break;
default:
ret = -EINVAL;
@@ -33,9 +33,15 @@ struct dbc_nonce {
struct dbc_user_nonce user;
} __packed;
+struct dbc_set_uid {
+ struct psp_req_buffer_hdr header;
+ struct dbc_user_setuid user;
+} __packed;
+
union dbc_buffer {
struct psp_request req;
struct dbc_nonce dbc_nonce;
+ struct dbc_set_uid dbc_set_uid;
};
void dbc_dev_destroy(struct psp_device *psp);
@@ -9,6 +9,7 @@ enum psp_platform_access_msg {
PSP_CMD_NONE = 0x0,
PSP_I2C_REQ_BUS_CMD = 0x64,
PSP_DYNAMIC_BOOST_GET_NONCE,
+ PSP_DYNAMIC_BOOST_SET_UID,
};
struct psp_req_buffer_hdr {
@@ -18,6 +18,7 @@
#define DBC_NONCE_SIZE 16
#define DBC_SIG_SIZE 32
+#define DBC_UID_SIZE 16
/**
* struct dbc_user_nonce - Nonce exchange structure (input/output).
@@ -34,6 +35,16 @@ struct dbc_user_nonce {
__u8 signature[DBC_SIG_SIZE];
} __packed;
+/**
+ * struct dbc_user_setuid - UID exchange structure (input).
+ * @uid: 16 byte value representing software identity
+ * @signature: 32 byte signature created by software using a previous nonce
+ */
+struct dbc_user_setuid {
+ __u8 uid[DBC_UID_SIZE];
+ __u8 signature[DBC_SIG_SIZE];
+} __packed;
+
/**
* Dynamic Boost Control (DBC) IOC
*
@@ -64,4 +75,13 @@ struct dbc_user_nonce {
*/
#define DBCIOCNONCE _IOWR(DBC_IOC_TYPE, 0x1, struct dbc_user_nonce)
+/**
+ * DBCIOCUID - Set the user ID (UID) of a calling process.
+ * The user ID is 8 bytes long. It must be programmed using a
+ * 32 byte signature built using the nonce fetched from
+ * DBCIOCNONCE.
+ * The UID can only be set once until the system is rebooted.
+ */
+#define DBCIOCUID _IOW(DBC_IOC_TYPE, 0x2, struct dbc_user_setuid)
+
#endif /* __PSP_DBC_USER_H__ */
As part of the authentication flow for Dynamic Boost Control, the calling software will need to send a uid used in all of its future communications. Add support for another IOCTL call to let userspace software set this up. Signed-off-by: Mario Limonciello <mario.limonciello@amd.com> --- v1->v2: * Update commit message --- drivers/crypto/ccp/dbc.c | 18 ++++++++++++++++++ drivers/crypto/ccp/dbc.h | 6 ++++++ include/linux/psp-platform-access.h | 1 + include/uapi/linux/psp-dbc.h | 20 ++++++++++++++++++++ 4 files changed, 45 insertions(+)