io_uring: use the proper helpers for io_send/recv

mainline inclusion
from mainline-5.6-rc1
commit 0b7b21e4
category: feature
bugzilla: https://bugzilla.openeuler.org/show_bug.cgi?id=27
CVE: NA
---------------------------

Don't use the recvmsg/sendmsg helpers, use the same helpers that the
recv(2) and send(2) system calls use.
Reported-by: N李通洲 <carter.li@eoitek.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>
Signed-off-by: Nyangerkun <yangerkun@huawei.com>
Reviewed-by: Nzhangyi (F) <yi.zhang@huawei.com>
Signed-off-by: NCheng Jian <cj.chengjian@huawei.com>

fs/io_uring.c

@@ -3042,7 +3042,8 @@ static int io_send(struct io_kiocb *req, struct io_kiocb **nxt,
 		else if (force_nonblock)
 			flags |= MSG_DONTWAIT;
 
-		ret = __sys_sendmsg_sock(sock, &msg, flags);
+		msg.msg_flags = flags;
+		ret = sock_sendmsg(sock, &msg);
 		if (force_nonblock && ret == -EAGAIN)
 			return -EAGAIN;
 		if (ret == -ERESTARTSYS)
@@ -3068,6 +3069,7 @@ static int io_recvmsg_prep(struct io_kiocb *req,
 
 	sr->msg_flags = READ_ONCE(sqe->msg_flags);
 	sr->msg = u64_to_user_ptr(READ_ONCE(sqe->addr));
+	sr->len = READ_ONCE(sqe->len);
 
 	if (!io || req->opcode == IORING_OP_RECV)
 		return 0;
@@ -3186,7 +3188,7 @@ static int io_recv(struct io_kiocb *req, struct io_kiocb **nxt,
 		else if (force_nonblock)
 			flags |= MSG_DONTWAIT;
 
-		ret = __sys_recvmsg_sock(sock, &msg, NULL, NULL, flags);
+		ret = sock_recvmsg(sock, &msg, flags);
 		if (force_nonblock && ret == -EAGAIN)
 			return -EAGAIN;
 		if (ret == -ERESTARTSYS)