s390/zcrypt: ep11 structs rework, export zcrypt_send_ep11_cprb

Minor rework for struct ep11_cprb and struct ep11_urb. Use of u8, u16,
u32 instead of unsigned char. Declare pointers to mem from userspace
with __user to give sparse a chance to check.

Export zcrypt_send_ep11_cprb() function as this function will be
called by code in progress which will build ep11 cprbs within the
zcrypt device driver zoo and send them to EP11 crypto cards.
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

arch/s390/include/uapi/asm/zcrypt.h

@@ -161,17 +161,17 @@ struct ica_xcRB {
  * @payload_len:	Payload length
  */
 struct ep11_cprb {
-	__u16		cprb_len;
-	unsigned char	cprb_ver_id;
-	unsigned char	pad_000[2];
-	unsigned char	flags;
-	unsigned char	func_id[2];
-	__u32		source_id;
-	__u32		target_id;
-	__u32		ret_code;
-	__u32		reserved1;
-	__u32		reserved2;
-	__u32		payload_len;
+	__u16	cprb_len;
+	__u8	cprb_ver_id;
+	__u8	pad_000[2];
+	__u8	flags;
+	__u8	func_id[2];
+	__u32	source_id;
+	__u32	target_id;
+	__u32	ret_code;
+	__u32	reserved1;
+	__u32	reserved2;
+	__u32	payload_len;
 } __attribute__((packed));
 
 /**
@@ -197,13 +197,13 @@ struct ep11_target_dev {
  */
 struct ep11_urb {
 	__u16		targets_num;
-	__u64		targets;
+	__u8 __user    *targets;
 	__u64		weight;
 	__u64		req_no;
 	__u64		req_len;
-	__u64		req;
+	__u8 __user    *req;
 	__u64		resp_len;
-	__u64		resp;
+	__u8 __user    *resp;
 } __attribute__((packed));
 
 /**

drivers/s390/crypto/zcrypt_api.c

@@ -923,8 +923,8 @@ static bool is_desired_ep11_queue(unsigned int dev_qid,
 	return false;
 }
 
-static long zcrypt_send_ep11_cprb(struct ap_perms *perms,
-				  struct ep11_urb *xcrb)
+static long _zcrypt_send_ep11_cprb(struct ap_perms *perms,
+				   struct ep11_urb *xcrb)
 {
 	struct zcrypt_card *zc, *pref_zc;
 	struct zcrypt_queue *zq, *pref_zq;
@@ -1029,6 +1029,12 @@ static long zcrypt_send_ep11_cprb(struct ap_perms *perms,
 	return rc;
 }
 
+long zcrypt_send_ep11_cprb(struct ep11_urb *xcrb)
+{
+	return _zcrypt_send_ep11_cprb(&ap_perms, xcrb);
+}
+EXPORT_SYMBOL(zcrypt_send_ep11_cprb);
+
 static long zcrypt_rng(char *buffer)
 {
 	struct zcrypt_card *zc, *pref_zc;
@@ -1369,12 +1375,12 @@ static long zcrypt_unlocked_ioctl(struct file *filp, unsigned int cmd,
 		if (copy_from_user(&xcrb, uxcrb, sizeof(xcrb)))
 			return -EFAULT;
 		do {
-			rc = zcrypt_send_ep11_cprb(perms, &xcrb);
+			rc = _zcrypt_send_ep11_cprb(perms, &xcrb);
 		} while (rc == -EAGAIN);
 		/* on failure: retry once again after a requested rescan */
 		if ((rc == -ENODEV) && (zcrypt_process_rescan()))
 			do {
-				rc = zcrypt_send_ep11_cprb(perms, &xcrb);
+				rc = _zcrypt_send_ep11_cprb(perms, &xcrb);
 			} while (rc == -EAGAIN);
 		if (rc)
 			ZCRYPT_DBF(DBF_DEBUG, "ioctl ZSENDEP11CPRB rc=%d\n", rc);

drivers/s390/crypto/zcrypt_api.h

@@ -140,6 +140,7 @@ struct zcrypt_ops *zcrypt_msgtype(unsigned char *, int);
 int zcrypt_api_init(void);
 void zcrypt_api_exit(void);
 long zcrypt_send_cprb(struct ica_xcRB *xcRB);
+long zcrypt_send_ep11_cprb(struct ep11_urb *urb);
 void zcrypt_device_status_mask_ext(struct zcrypt_device_status_ext *devstatus);
 int zcrypt_device_status_ext(int card, int queue,
 			     struct zcrypt_device_status_ext *devstatus);