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crypto: ccp - Add support for setting user ID for dynamic boost control

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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.

Acked-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Mario Limonciello 2023-06-23 08:49:56 -05:00 committed by Herbert Xu
parent c04cf9e14f
commit d9408716d2
4 changed files with 45 additions and 0 deletions
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18
drivers/crypto/ccp/dbc.c
View file

@ -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;

6
drivers/crypto/ccp/dbc.h
View file

@ -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);

1
include/linux/psp-platform-access.h
View file

@ -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 {

20
include/uapi/linux/psp-dbc.h
View file

@ -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__ */