Commit f499a021 authored by Jens Axboe's avatar Jens Axboe
Browse files

io_uring: ensure async punted connect requests copy data 



Just like commit f67676d1 for read/write requests, this one ensures
that the sockaddr data has been copied for IORING_OP_CONNECT if we need
to punt the request to async context.

Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 03b1230c

fs/io_uring.c

+47 −4
Original line number Diff line number Diff line
@@ -308,6 +308,10 @@ struct io_timeout { 
	struct io_timeout_data		*data;

};



struct io_async_connect {

	struct sockaddr_storage		address;

};



struct io_async_msghdr {

	struct iovec			fast_iov[UIO_FASTIOV];

	struct iovec			*iov;
@@ -327,6 +331,7 @@ struct io_async_ctx { 
	union {

		struct io_async_rw	rw;

		struct io_async_msghdr	msg;

		struct io_async_connect	connect;

	};

};
@@ -2195,11 +2200,26 @@ static int io_accept(struct io_kiocb *req, const struct io_uring_sqe *sqe, 
#endif

}



static int io_connect_prep(struct io_kiocb *req, struct io_async_ctx *io)

{

#if defined(CONFIG_NET)

	const struct io_uring_sqe *sqe = req->sqe;

	struct sockaddr __user *addr;

	int addr_len;



	addr = (struct sockaddr __user *) (unsigned long) READ_ONCE(sqe->addr);

	addr_len = READ_ONCE(sqe->addr2);

	return move_addr_to_kernel(addr, addr_len, &io->connect.address);

#else

	return 0;

#endif

}



static int io_connect(struct io_kiocb *req, const struct io_uring_sqe *sqe,

		      struct io_kiocb **nxt, bool force_nonblock)

{

#if defined(CONFIG_NET)

	struct sockaddr __user *addr;

	struct io_async_ctx __io, *io;

	unsigned file_flags;

	int addr_len, ret;
@@ -2208,15 +2228,35 @@ static int io_connect(struct io_kiocb *req, const struct io_uring_sqe *sqe, 
	if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags)

		return -EINVAL;



	addr = (struct sockaddr __user *) (unsigned long) READ_ONCE(sqe->addr);

	addr_len = READ_ONCE(sqe->addr2);

	file_flags = force_nonblock ? O_NONBLOCK : 0;



	ret = __sys_connect_file(req->file, addr, addr_len, file_flags);

	if (ret == -EAGAIN && force_nonblock)

	if (req->io) {

		io = req->io;

	} else {

		ret = io_connect_prep(req, &__io);

		if (ret)

			goto out;

		io = &__io;

	}



	ret = __sys_connect_file(req->file, &io->connect.address, addr_len,

					file_flags);

	if (ret == -EAGAIN && force_nonblock) {

		io = kmalloc(sizeof(*io), GFP_KERNEL);

		if (!io) {

			ret = -ENOMEM;

			goto out;

		}

		memcpy(&io->connect, &__io.connect, sizeof(io->connect));

		req->io = io;

		memcpy(&io->sqe, req->sqe, sizeof(*req->sqe));

		req->sqe = &io->sqe;

		return -EAGAIN;

	}

	if (ret == -ERESTARTSYS)

		ret = -EINTR;

out:

	if (ret < 0 && (req->flags & REQ_F_LINK))

		req->flags |= REQ_F_FAIL_LINK;

	io_cqring_add_event(req, ret);
@@ -2832,6 +2872,9 @@ static int io_req_defer_prep(struct io_kiocb *req, struct io_async_ctx *io) 
	case IORING_OP_RECVMSG:

		ret = io_recvmsg_prep(req, io);

		break;

	case IORING_OP_CONNECT:

		ret = io_connect_prep(req, io);

		break;

	default:

		req->io = io;

		return 0;

include/linux/socket.h

+2 −3
Original line number Diff line number Diff line
@@ -406,9 +406,8 @@ extern int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr, 
			 int __user *upeer_addrlen, int flags);

extern int __sys_socket(int family, int type, int protocol);

extern int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen);

extern int __sys_connect_file(struct file *file,

			struct sockaddr __user *uservaddr, int addrlen,

			int file_flags);

extern int __sys_connect_file(struct file *file, struct sockaddr_storage *addr,

			      int addrlen, int file_flags);

extern int __sys_connect(int fd, struct sockaddr __user *uservaddr,

			 int addrlen);

extern int __sys_listen(int fd, int backlog);

net/socket.c

+8 −8
Original line number Diff line number Diff line
@@ -1826,26 +1826,22 @@ SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr, 
 *	include the -EINPROGRESS status for such sockets.

 */



int __sys_connect_file(struct file *file, struct sockaddr __user *uservaddr,

int __sys_connect_file(struct file *file, struct sockaddr_storage *address,

		       int addrlen, int file_flags)

{

	struct socket *sock;

	struct sockaddr_storage address;

	int err;



	sock = sock_from_file(file, &err);

	if (!sock)

		goto out;

	err = move_addr_to_kernel(uservaddr, addrlen, &address);

	if (err < 0)

		goto out;



	err =

	    security_socket_connect(sock, (struct sockaddr *)&address, addrlen);

	    security_socket_connect(sock, (struct sockaddr *)address, addrlen);

	if (err)

		goto out;



	err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,

	err = sock->ops->connect(sock, (struct sockaddr *)address, addrlen,

				 sock->file->f_flags | file_flags);

out:

	return err;
@@ -1858,7 +1854,11 @@ int __sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen) 


	f = fdget(fd);

	if (f.file) {

		ret = __sys_connect_file(f.file, uservaddr, addrlen, 0);

		struct sockaddr_storage address;



		ret = move_addr_to_kernel(uservaddr, addrlen, &address);

		if (!ret)

			ret = __sys_connect_file(f.file, &address, addrlen, 0);

		if (f.flags)

			fput(f.file);

	}

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