1 // SPDX-License-Identifier: GPL-2.0-only
31 	struct ecryptfs_daemon *daemon = file->private_data;  in ecryptfs_miscdev_poll()
34 	mutex_lock(&daemon->mux);  in ecryptfs_miscdev_poll()
35 	if (daemon->flags & ECRYPTFS_DAEMON_ZOMBIE) {  in ecryptfs_miscdev_poll()
40 	if (daemon->flags & ECRYPTFS_DAEMON_IN_READ)  in ecryptfs_miscdev_poll()
42 	if (daemon->flags & ECRYPTFS_DAEMON_IN_POLL)  in ecryptfs_miscdev_poll()
44 	daemon->flags |= ECRYPTFS_DAEMON_IN_POLL;  in ecryptfs_miscdev_poll()
45 	mutex_unlock(&daemon->mux);  in ecryptfs_miscdev_poll()
46 	poll_wait(file, &daemon->wait, pt);  in ecryptfs_miscdev_poll()
47 	mutex_lock(&daemon->mux);  in ecryptfs_miscdev_poll()
48 	if (!list_empty(&daemon->msg_ctx_out_queue))  in ecryptfs_miscdev_poll()
51 	daemon->flags &= ~ECRYPTFS_DAEMON_IN_POLL;  in ecryptfs_miscdev_poll()
52 	mutex_unlock(&daemon->mux);  in ecryptfs_miscdev_poll()
61  * Returns zero on success; non-zero otherwise
72 		rc = -EINVAL;  in ecryptfs_miscdev_open()
81 	mutex_lock(&daemon->mux);  in ecryptfs_miscdev_open()
82 	if (daemon->flags & ECRYPTFS_DAEMON_MISCDEV_OPEN) {  in ecryptfs_miscdev_open()
83 		rc = -EBUSY;  in ecryptfs_miscdev_open()
86 	daemon->flags |= ECRYPTFS_DAEMON_MISCDEV_OPEN;  in ecryptfs_miscdev_open()
87 	file->private_data = daemon;  in ecryptfs_miscdev_open()
90 	mutex_unlock(&daemon->mux);  in ecryptfs_miscdev_open()
104  * Returns zero on success; non-zero otherwise
109 	struct ecryptfs_daemon *daemon = file->private_data;  in ecryptfs_miscdev_release()
112 	mutex_lock(&daemon->mux);  in ecryptfs_miscdev_release()
113 	BUG_ON(!(daemon->flags & ECRYPTFS_DAEMON_MISCDEV_OPEN));  in ecryptfs_miscdev_release()
114 	daemon->flags &= ~ECRYPTFS_DAEMON_MISCDEV_OPEN;  in ecryptfs_miscdev_release()
116 	mutex_unlock(&daemon->mux);  in ecryptfs_miscdev_release()
132  * @data: Data to send to daemon; may be NULL
133  * @data_size: Amount of data to send to daemon
140  * Add msg_ctx to queue and then, if it exists, notify the blocked
141  * miscdevess about the data being available. Must be called with
144  * Returns zero on success; non-zero otherwise
146 int ecryptfs_send_miscdev(char *data, size_t data_size,  in ecryptfs_send_miscdev()  argument
154 		return -ENOMEM;  in ecryptfs_send_miscdev()
156 	mutex_lock(&msg_ctx->mux);  in ecryptfs_send_miscdev()
157 	msg_ctx->msg = msg;  in ecryptfs_send_miscdev()
158 	msg_ctx->msg->index = msg_ctx->index;  in ecryptfs_send_miscdev()
159 	msg_ctx->msg->data_len = data_size;  in ecryptfs_send_miscdev()
160 	msg_ctx->type = msg_type;  in ecryptfs_send_miscdev()
161 	memcpy(msg_ctx->msg->data, data, data_size);  in ecryptfs_send_miscdev()
162 	msg_ctx->msg_size = (sizeof(*msg_ctx->msg) + data_size);  in ecryptfs_send_miscdev()
163 	list_add_tail(&msg_ctx->daemon_out_list, &daemon->msg_ctx_out_queue);  in ecryptfs_send_miscdev()
164 	mutex_unlock(&msg_ctx->mux);  in ecryptfs_send_miscdev()
166 	mutex_lock(&daemon->mux);  in ecryptfs_send_miscdev()
167 	daemon->num_queued_msg_ctx++;  in ecryptfs_send_miscdev()
168 	wake_up_interruptible(&daemon->wait);  in ecryptfs_send_miscdev()
169 	mutex_unlock(&daemon->mux);  in ecryptfs_send_miscdev()
177  *  Octets 1-4: network byte order msg_ctx->counter
178  *  Octets 5-N0: Size of struct ecryptfs_message to follow
179  *  Octets N0-N1: struct ecryptfs_message (including data)
181  *  Octets 5-N1 not written if the packet type does not include a message
198  * ecryptfs_miscdev_read - format and send message from queue
213 	struct ecryptfs_daemon *daemon = file->private_data;  in ecryptfs_miscdev_read()
221 	mutex_lock(&daemon->mux);  in ecryptfs_miscdev_read()
222 	if (daemon->flags & ECRYPTFS_DAEMON_ZOMBIE) {  in ecryptfs_miscdev_read()
228 	if (daemon->flags & ECRYPTFS_DAEMON_IN_READ) {  in ecryptfs_miscdev_read()
233 	daemon->flags |= ECRYPTFS_DAEMON_IN_READ;  in ecryptfs_miscdev_read()
235 	if (list_empty(&daemon->msg_ctx_out_queue)) {  in ecryptfs_miscdev_read()
236 		mutex_unlock(&daemon->mux);  in ecryptfs_miscdev_read()
238 			daemon->wait, !list_empty(&daemon->msg_ctx_out_queue));  in ecryptfs_miscdev_read()
239 		mutex_lock(&daemon->mux);  in ecryptfs_miscdev_read()
245 	if (daemon->flags & ECRYPTFS_DAEMON_ZOMBIE) {  in ecryptfs_miscdev_read()
249 	if (list_empty(&daemon->msg_ctx_out_queue)) {  in ecryptfs_miscdev_read()
255 	msg_ctx = list_first_entry(&daemon->msg_ctx_out_queue,  in ecryptfs_miscdev_read()
258 	mutex_lock(&msg_ctx->mux);  in ecryptfs_miscdev_read()
259 	if (msg_ctx->msg) {  in ecryptfs_miscdev_read()
261 						  msg_ctx->msg_size,  in ecryptfs_miscdev_read()
271 		msg_ctx->msg_size = 0;  in ecryptfs_miscdev_read()
274 			+ msg_ctx->msg_size);  in ecryptfs_miscdev_read()
282 	rc = -EFAULT;  in ecryptfs_miscdev_read()
283 	if (put_user(msg_ctx->type, buf))  in ecryptfs_miscdev_read()
285 	if (put_user(cpu_to_be32(msg_ctx->counter),  in ecryptfs_miscdev_read()
289 	if (msg_ctx->msg) {  in ecryptfs_miscdev_read()
293 		if (copy_to_user(&buf[i], msg_ctx->msg, msg_ctx->msg_size))  in ecryptfs_miscdev_read()
295 		i += msg_ctx->msg_size;  in ecryptfs_miscdev_read()
298 	list_del(&msg_ctx->daemon_out_list);  in ecryptfs_miscdev_read()
299 	kfree(msg_ctx->msg);  in ecryptfs_miscdev_read()
300 	msg_ctx->msg = NULL;  in ecryptfs_miscdev_read()
303 	if (msg_ctx->type != ECRYPTFS_MSG_REQUEST)  in ecryptfs_miscdev_read()
306 	mutex_unlock(&msg_ctx->mux);  in ecryptfs_miscdev_read()
308 	daemon->flags &= ~ECRYPTFS_DAEMON_IN_READ;  in ecryptfs_miscdev_read()
309 	mutex_unlock(&daemon->mux);  in ecryptfs_miscdev_read()
314  * ecryptfs_miscdev_response - miscdevess response to message previously sent to daemon
316  * @data: Bytes comprising struct ecryptfs_message
317  * @data_size: sizeof(struct ecryptfs_message) + data len
320  * Returns zero on success; non-zero otherwise
322 static int ecryptfs_miscdev_response(struct ecryptfs_daemon *daemon, char *data,  in ecryptfs_miscdev_response()  argument
325 	struct ecryptfs_message *msg = (struct ecryptfs_message *)data;  in ecryptfs_miscdev_response()
328 	if ((sizeof(*msg) + msg->data_len) != data_size) {  in ecryptfs_miscdev_response()
329 		printk(KERN_WARNING "%s: (sizeof(*msg) + msg->data_len) = "  in ecryptfs_miscdev_response()
331 		       (sizeof(*msg) + msg->data_len), data_size);  in ecryptfs_miscdev_response()
332 		rc = -EINVAL;  in ecryptfs_miscdev_response()
344  * ecryptfs_miscdev_write - handle write to daemon miscdev handle
346  * @buf: Buffer containing user data
347  * @count: Amount of data in @buf
359 	char *data;  in ecryptfs_miscdev_write()  local
366 		/* Likely a harmless MSG_HELO or MSG_QUIT - no packet length */  in ecryptfs_miscdev_write()
370 		       "[%d-%zu], but amount of data written is [%zu].\n",  in ecryptfs_miscdev_write()
372 		return -EINVAL;  in ecryptfs_miscdev_write()
379 		return -EFAULT;  in ecryptfs_miscdev_write()
394 		return -EINVAL;  in ecryptfs_miscdev_write()
398 	data = memdup_user(buf, count);  in ecryptfs_miscdev_write()
399 	if (IS_ERR(data)) {  in ecryptfs_miscdev_write()
401 		       __func__, PTR_ERR(data));  in ecryptfs_miscdev_write()
402 		return PTR_ERR(data);  in ecryptfs_miscdev_write()
404 	switch (data[PKT_TYPE_OFFSET]) {  in ecryptfs_miscdev_write()
409 			       "size is [%zd], but amount of data written is "  in ecryptfs_miscdev_write()
414 			rc = -EINVAL;  in ecryptfs_miscdev_write()
417 		memcpy(&counter_nbo, &data[PKT_CTR_OFFSET], PKT_CTR_SIZE);  in ecryptfs_miscdev_write()
419 		rc = ecryptfs_miscdev_response(file->private_data,  in ecryptfs_miscdev_write()
420 				&data[PKT_LEN_OFFSET + packet_size_length],  in ecryptfs_miscdev_write()
435 				data[0]);  in ecryptfs_miscdev_write()
436 		rc = -EINVAL;  in ecryptfs_miscdev_write()
441 	kfree(data);  in ecryptfs_miscdev_write()
470  * Returns zero on success; non-zero otherwise