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Linux/fs/ecryptfs/miscdev.c

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  1 /**
  2  * eCryptfs: Linux filesystem encryption layer
  3  *
  4  * Copyright (C) 2008 International Business Machines Corp.
  5  *   Author(s): Michael A. Halcrow <mhalcrow@us.ibm.com>
  6  *
  7  * This program is free software; you can redistribute it and/or
  8  * modify it under the terms of the GNU General Public License version
  9  * 2 as published by the Free Software Foundation.
 10  *
 11  * This program is distributed in the hope that it will be useful, but
 12  * WITHOUT ANY WARRANTY; without even the implied warranty of
 13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 14  * General Public License for more details.
 15  *
 16  * You should have received a copy of the GNU General Public License
 17  * along with this program; if not, write to the Free Software
 18  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 19  * 02111-1307, USA.
 20  */
 21 
 22 #include <linux/fs.h>
 23 #include <linux/hash.h>
 24 #include <linux/random.h>
 25 #include <linux/miscdevice.h>
 26 #include <linux/poll.h>
 27 #include <linux/slab.h>
 28 #include <linux/wait.h>
 29 #include <linux/module.h>
 30 #include "ecryptfs_kernel.h"
 31 
 32 static atomic_t ecryptfs_num_miscdev_opens;
 33 
 34 /**
 35  * ecryptfs_miscdev_poll
 36  * @file: dev file
 37  * @pt: dev poll table (ignored)
 38  *
 39  * Returns the poll mask
 40  */
 41 static unsigned int
 42 ecryptfs_miscdev_poll(struct file *file, poll_table *pt)
 43 {
 44         struct ecryptfs_daemon *daemon = file->private_data;
 45         unsigned int mask = 0;
 46 
 47         mutex_lock(&daemon->mux);
 48         if (daemon->flags & ECRYPTFS_DAEMON_ZOMBIE) {
 49                 printk(KERN_WARNING "%s: Attempt to poll on zombified "
 50                        "daemon\n", __func__);
 51                 goto out_unlock_daemon;
 52         }
 53         if (daemon->flags & ECRYPTFS_DAEMON_IN_READ)
 54                 goto out_unlock_daemon;
 55         if (daemon->flags & ECRYPTFS_DAEMON_IN_POLL)
 56                 goto out_unlock_daemon;
 57         daemon->flags |= ECRYPTFS_DAEMON_IN_POLL;
 58         mutex_unlock(&daemon->mux);
 59         poll_wait(file, &daemon->wait, pt);
 60         mutex_lock(&daemon->mux);
 61         if (!list_empty(&daemon->msg_ctx_out_queue))
 62                 mask |= POLLIN | POLLRDNORM;
 63 out_unlock_daemon:
 64         daemon->flags &= ~ECRYPTFS_DAEMON_IN_POLL;
 65         mutex_unlock(&daemon->mux);
 66         return mask;
 67 }
 68 
 69 /**
 70  * ecryptfs_miscdev_open
 71  * @inode: inode of miscdev handle (ignored)
 72  * @file: file for miscdev handle
 73  *
 74  * Returns zero on success; non-zero otherwise
 75  */
 76 static int
 77 ecryptfs_miscdev_open(struct inode *inode, struct file *file)
 78 {
 79         struct ecryptfs_daemon *daemon = NULL;
 80         int rc;
 81 
 82         mutex_lock(&ecryptfs_daemon_hash_mux);
 83         rc = try_module_get(THIS_MODULE);
 84         if (rc == 0) {
 85                 rc = -EIO;
 86                 printk(KERN_ERR "%s: Error attempting to increment module use "
 87                        "count; rc = [%d]\n", __func__, rc);
 88                 goto out_unlock_daemon_list;
 89         }
 90         rc = ecryptfs_find_daemon_by_euid(&daemon);
 91         if (!rc) {
 92                 rc = -EINVAL;
 93                 goto out_unlock_daemon_list;
 94         }
 95         rc = ecryptfs_spawn_daemon(&daemon, file);
 96         if (rc) {
 97                 printk(KERN_ERR "%s: Error attempting to spawn daemon; "
 98                        "rc = [%d]\n", __func__, rc);
 99                 goto out_module_put_unlock_daemon_list;
100         }
101         mutex_lock(&daemon->mux);
102         if (daemon->flags & ECRYPTFS_DAEMON_MISCDEV_OPEN) {
103                 rc = -EBUSY;
104                 goto out_unlock_daemon;
105         }
106         daemon->flags |= ECRYPTFS_DAEMON_MISCDEV_OPEN;
107         file->private_data = daemon;
108         atomic_inc(&ecryptfs_num_miscdev_opens);
109 out_unlock_daemon:
110         mutex_unlock(&daemon->mux);
111 out_module_put_unlock_daemon_list:
112         if (rc)
113                 module_put(THIS_MODULE);
114 out_unlock_daemon_list:
115         mutex_unlock(&ecryptfs_daemon_hash_mux);
116         return rc;
117 }
118 
119 /**
120  * ecryptfs_miscdev_release
121  * @inode: inode of fs/ecryptfs/euid handle (ignored)
122  * @file: file for fs/ecryptfs/euid handle
123  *
124  * This keeps the daemon registered until the daemon sends another
125  * ioctl to fs/ecryptfs/ctl or until the kernel module unregisters.
126  *
127  * Returns zero on success; non-zero otherwise
128  */
129 static int
130 ecryptfs_miscdev_release(struct inode *inode, struct file *file)
131 {
132         struct ecryptfs_daemon *daemon = file->private_data;
133         int rc;
134 
135         mutex_lock(&daemon->mux);
136         BUG_ON(!(daemon->flags & ECRYPTFS_DAEMON_MISCDEV_OPEN));
137         daemon->flags &= ~ECRYPTFS_DAEMON_MISCDEV_OPEN;
138         atomic_dec(&ecryptfs_num_miscdev_opens);
139         mutex_unlock(&daemon->mux);
140 
141         mutex_lock(&ecryptfs_daemon_hash_mux);
142         rc = ecryptfs_exorcise_daemon(daemon);
143         mutex_unlock(&ecryptfs_daemon_hash_mux);
144         if (rc) {
145                 printk(KERN_CRIT "%s: Fatal error whilst attempting to "
146                        "shut down daemon; rc = [%d]. Please report this "
147                        "bug.\n", __func__, rc);
148                 BUG();
149         }
150         module_put(THIS_MODULE);
151         return rc;
152 }
153 
154 /**
155  * ecryptfs_send_miscdev
156  * @data: Data to send to daemon; may be NULL
157  * @data_size: Amount of data to send to daemon
158  * @msg_ctx: Message context, which is used to handle the reply. If
159  *           this is NULL, then we do not expect a reply.
160  * @msg_type: Type of message
161  * @msg_flags: Flags for message
162  * @daemon: eCryptfs daemon object
163  *
164  * Add msg_ctx to queue and then, if it exists, notify the blocked
165  * miscdevess about the data being available. Must be called with
166  * ecryptfs_daemon_hash_mux held.
167  *
168  * Returns zero on success; non-zero otherwise
169  */
170 int ecryptfs_send_miscdev(char *data, size_t data_size,
171                           struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type,
172                           u16 msg_flags, struct ecryptfs_daemon *daemon)
173 {
174         struct ecryptfs_message *msg;
175 
176         msg = kmalloc((sizeof(*msg) + data_size), GFP_KERNEL);
177         if (!msg) {
178                 printk(KERN_ERR "%s: Out of memory whilst attempting "
179                        "to kmalloc(%zd, GFP_KERNEL)\n", __func__,
180                        (sizeof(*msg) + data_size));
181                 return -ENOMEM;
182         }
183 
184         mutex_lock(&msg_ctx->mux);
185         msg_ctx->msg = msg;
186         msg_ctx->msg->index = msg_ctx->index;
187         msg_ctx->msg->data_len = data_size;
188         msg_ctx->type = msg_type;
189         memcpy(msg_ctx->msg->data, data, data_size);
190         msg_ctx->msg_size = (sizeof(*msg_ctx->msg) + data_size);
191         list_add_tail(&msg_ctx->daemon_out_list, &daemon->msg_ctx_out_queue);
192         mutex_unlock(&msg_ctx->mux);
193 
194         mutex_lock(&daemon->mux);
195         daemon->num_queued_msg_ctx++;
196         wake_up_interruptible(&daemon->wait);
197         mutex_unlock(&daemon->mux);
198 
199         return 0;
200 }
201 
202 /*
203  * miscdevfs packet format:
204  *  Octet 0: Type
205  *  Octets 1-4: network byte order msg_ctx->counter
206  *  Octets 5-N0: Size of struct ecryptfs_message to follow
207  *  Octets N0-N1: struct ecryptfs_message (including data)
208  *
209  *  Octets 5-N1 not written if the packet type does not include a message
210  */
211 #define PKT_TYPE_SIZE           1
212 #define PKT_CTR_SIZE            4
213 #define MIN_NON_MSG_PKT_SIZE    (PKT_TYPE_SIZE + PKT_CTR_SIZE)
214 #define MIN_MSG_PKT_SIZE        (PKT_TYPE_SIZE + PKT_CTR_SIZE \
215                                  + ECRYPTFS_MIN_PKT_LEN_SIZE)
216 /* 4 + ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES comes from tag 65 packet format */
217 #define MAX_MSG_PKT_SIZE        (PKT_TYPE_SIZE + PKT_CTR_SIZE \
218                                  + ECRYPTFS_MAX_PKT_LEN_SIZE \
219                                  + sizeof(struct ecryptfs_message) \
220                                  + 4 + ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES)
221 #define PKT_TYPE_OFFSET         0
222 #define PKT_CTR_OFFSET          PKT_TYPE_SIZE
223 #define PKT_LEN_OFFSET          (PKT_TYPE_SIZE + PKT_CTR_SIZE)
224 
225 /**
226  * ecryptfs_miscdev_read - format and send message from queue
227  * @file: miscdevfs handle
228  * @buf: User buffer into which to copy the next message on the daemon queue
229  * @count: Amount of space available in @buf
230  * @ppos: Offset in file (ignored)
231  *
232  * Pulls the most recent message from the daemon queue, formats it for
233  * being sent via a miscdevfs handle, and copies it into @buf
234  *
235  * Returns the number of bytes copied into the user buffer
236  */
237 static ssize_t
238 ecryptfs_miscdev_read(struct file *file, char __user *buf, size_t count,
239                       loff_t *ppos)
240 {
241         struct ecryptfs_daemon *daemon = file->private_data;
242         struct ecryptfs_msg_ctx *msg_ctx;
243         size_t packet_length_size;
244         char packet_length[ECRYPTFS_MAX_PKT_LEN_SIZE];
245         size_t i;
246         size_t total_length;
247         int rc;
248 
249         mutex_lock(&daemon->mux);
250         if (daemon->flags & ECRYPTFS_DAEMON_ZOMBIE) {
251                 rc = 0;
252                 printk(KERN_WARNING "%s: Attempt to read from zombified "
253                        "daemon\n", __func__);
254                 goto out_unlock_daemon;
255         }
256         if (daemon->flags & ECRYPTFS_DAEMON_IN_READ) {
257                 rc = 0;
258                 goto out_unlock_daemon;
259         }
260         /* This daemon will not go away so long as this flag is set */
261         daemon->flags |= ECRYPTFS_DAEMON_IN_READ;
262 check_list:
263         if (list_empty(&daemon->msg_ctx_out_queue)) {
264                 mutex_unlock(&daemon->mux);
265                 rc = wait_event_interruptible(
266                         daemon->wait, !list_empty(&daemon->msg_ctx_out_queue));
267                 mutex_lock(&daemon->mux);
268                 if (rc < 0) {
269                         rc = 0;
270                         goto out_unlock_daemon;
271                 }
272         }
273         if (daemon->flags & ECRYPTFS_DAEMON_ZOMBIE) {
274                 rc = 0;
275                 goto out_unlock_daemon;
276         }
277         if (list_empty(&daemon->msg_ctx_out_queue)) {
278                 /* Something else jumped in since the
279                  * wait_event_interruptable() and removed the
280                  * message from the queue; try again */
281                 goto check_list;
282         }
283         msg_ctx = list_first_entry(&daemon->msg_ctx_out_queue,
284                                    struct ecryptfs_msg_ctx, daemon_out_list);
285         BUG_ON(!msg_ctx);
286         mutex_lock(&msg_ctx->mux);
287         if (msg_ctx->msg) {
288                 rc = ecryptfs_write_packet_length(packet_length,
289                                                   msg_ctx->msg_size,
290                                                   &packet_length_size);
291                 if (rc) {
292                         rc = 0;
293                         printk(KERN_WARNING "%s: Error writing packet length; "
294                                "rc = [%d]\n", __func__, rc);
295                         goto out_unlock_msg_ctx;
296                 }
297         } else {
298                 packet_length_size = 0;
299                 msg_ctx->msg_size = 0;
300         }
301         total_length = (PKT_TYPE_SIZE + PKT_CTR_SIZE + packet_length_size
302                         + msg_ctx->msg_size);
303         if (count < total_length) {
304                 rc = 0;
305                 printk(KERN_WARNING "%s: Only given user buffer of "
306                        "size [%zd], but we need [%zd] to read the "
307                        "pending message\n", __func__, count, total_length);
308                 goto out_unlock_msg_ctx;
309         }
310         rc = -EFAULT;
311         if (put_user(msg_ctx->type, buf))
312                 goto out_unlock_msg_ctx;
313         if (put_user(cpu_to_be32(msg_ctx->counter),
314                      (__be32 __user *)(&buf[PKT_CTR_OFFSET])))
315                 goto out_unlock_msg_ctx;
316         i = PKT_TYPE_SIZE + PKT_CTR_SIZE;
317         if (msg_ctx->msg) {
318                 if (copy_to_user(&buf[i], packet_length, packet_length_size))
319                         goto out_unlock_msg_ctx;
320                 i += packet_length_size;
321                 if (copy_to_user(&buf[i], msg_ctx->msg, msg_ctx->msg_size))
322                         goto out_unlock_msg_ctx;
323                 i += msg_ctx->msg_size;
324         }
325         rc = i;
326         list_del(&msg_ctx->daemon_out_list);
327         kfree(msg_ctx->msg);
328         msg_ctx->msg = NULL;
329         /* We do not expect a reply from the userspace daemon for any
330          * message type other than ECRYPTFS_MSG_REQUEST */
331         if (msg_ctx->type != ECRYPTFS_MSG_REQUEST)
332                 ecryptfs_msg_ctx_alloc_to_free(msg_ctx);
333 out_unlock_msg_ctx:
334         mutex_unlock(&msg_ctx->mux);
335 out_unlock_daemon:
336         daemon->flags &= ~ECRYPTFS_DAEMON_IN_READ;
337         mutex_unlock(&daemon->mux);
338         return rc;
339 }
340 
341 /**
342  * ecryptfs_miscdev_response - miscdevess response to message previously sent to daemon
343  * @data: Bytes comprising struct ecryptfs_message
344  * @data_size: sizeof(struct ecryptfs_message) + data len
345  * @seq: Sequence number for miscdev response packet
346  *
347  * Returns zero on success; non-zero otherwise
348  */
349 static int ecryptfs_miscdev_response(struct ecryptfs_daemon *daemon, char *data,
350                                      size_t data_size, u32 seq)
351 {
352         struct ecryptfs_message *msg = (struct ecryptfs_message *)data;
353         int rc;
354 
355         if ((sizeof(*msg) + msg->data_len) != data_size) {
356                 printk(KERN_WARNING "%s: (sizeof(*msg) + msg->data_len) = "
357                        "[%zd]; data_size = [%zd]. Invalid packet.\n", __func__,
358                        (sizeof(*msg) + msg->data_len), data_size);
359                 rc = -EINVAL;
360                 goto out;
361         }
362         rc = ecryptfs_process_response(daemon, msg, seq);
363         if (rc)
364                 printk(KERN_ERR
365                        "Error processing response message; rc = [%d]\n", rc);
366 out:
367         return rc;
368 }
369 
370 /**
371  * ecryptfs_miscdev_write - handle write to daemon miscdev handle
372  * @file: File for misc dev handle
373  * @buf: Buffer containing user data
374  * @count: Amount of data in @buf
375  * @ppos: Pointer to offset in file (ignored)
376  *
377  * Returns the number of bytes read from @buf
378  */
379 static ssize_t
380 ecryptfs_miscdev_write(struct file *file, const char __user *buf,
381                        size_t count, loff_t *ppos)
382 {
383         __be32 counter_nbo;
384         u32 seq;
385         size_t packet_size, packet_size_length;
386         char *data;
387         unsigned char packet_size_peek[ECRYPTFS_MAX_PKT_LEN_SIZE];
388         ssize_t rc;
389 
390         if (count == 0) {
391                 return 0;
392         } else if (count == MIN_NON_MSG_PKT_SIZE) {
393                 /* Likely a harmless MSG_HELO or MSG_QUIT - no packet length */
394                 goto memdup;
395         } else if (count < MIN_MSG_PKT_SIZE || count > MAX_MSG_PKT_SIZE) {
396                 printk(KERN_WARNING "%s: Acceptable packet size range is "
397                        "[%d-%zu], but amount of data written is [%zu].",
398                        __func__, MIN_MSG_PKT_SIZE, MAX_MSG_PKT_SIZE, count);
399                 return -EINVAL;
400         }
401 
402         if (copy_from_user(packet_size_peek, &buf[PKT_LEN_OFFSET],
403                            sizeof(packet_size_peek))) {
404                 printk(KERN_WARNING "%s: Error while inspecting packet size\n",
405                        __func__);
406                 return -EFAULT;
407         }
408 
409         rc = ecryptfs_parse_packet_length(packet_size_peek, &packet_size,
410                                           &packet_size_length);
411         if (rc) {
412                 printk(KERN_WARNING "%s: Error parsing packet length; "
413                        "rc = [%zd]\n", __func__, rc);
414                 return rc;
415         }
416 
417         if ((PKT_TYPE_SIZE + PKT_CTR_SIZE + packet_size_length + packet_size)
418             != count) {
419                 printk(KERN_WARNING "%s: Invalid packet size [%zu]\n", __func__,
420                        packet_size);
421                 return -EINVAL;
422         }
423 
424 memdup:
425         data = memdup_user(buf, count);
426         if (IS_ERR(data)) {
427                 printk(KERN_ERR "%s: memdup_user returned error [%ld]\n",
428                        __func__, PTR_ERR(data));
429                 return PTR_ERR(data);
430         }
431         switch (data[PKT_TYPE_OFFSET]) {
432         case ECRYPTFS_MSG_RESPONSE:
433                 if (count < (MIN_MSG_PKT_SIZE
434                              + sizeof(struct ecryptfs_message))) {
435                         printk(KERN_WARNING "%s: Minimum acceptable packet "
436                                "size is [%zd], but amount of data written is "
437                                "only [%zd]. Discarding response packet.\n",
438                                __func__,
439                                (MIN_MSG_PKT_SIZE
440                                 + sizeof(struct ecryptfs_message)), count);
441                         rc = -EINVAL;
442                         goto out_free;
443                 }
444                 memcpy(&counter_nbo, &data[PKT_CTR_OFFSET], PKT_CTR_SIZE);
445                 seq = be32_to_cpu(counter_nbo);
446                 rc = ecryptfs_miscdev_response(file->private_data,
447                                 &data[PKT_LEN_OFFSET + packet_size_length],
448                                 packet_size, seq);
449                 if (rc) {
450                         printk(KERN_WARNING "%s: Failed to deliver miscdev "
451                                "response to requesting operation; rc = [%zd]\n",
452                                __func__, rc);
453                         goto out_free;
454                 }
455                 break;
456         case ECRYPTFS_MSG_HELO:
457         case ECRYPTFS_MSG_QUIT:
458                 break;
459         default:
460                 ecryptfs_printk(KERN_WARNING, "Dropping miscdev "
461                                 "message of unrecognized type [%d]\n",
462                                 data[0]);
463                 rc = -EINVAL;
464                 goto out_free;
465         }
466         rc = count;
467 out_free:
468         kfree(data);
469         return rc;
470 }
471 
472 
473 static const struct file_operations ecryptfs_miscdev_fops = {
474         .open    = ecryptfs_miscdev_open,
475         .poll    = ecryptfs_miscdev_poll,
476         .read    = ecryptfs_miscdev_read,
477         .write   = ecryptfs_miscdev_write,
478         .release = ecryptfs_miscdev_release,
479         .llseek  = noop_llseek,
480 };
481 
482 static struct miscdevice ecryptfs_miscdev = {
483         .minor = MISC_DYNAMIC_MINOR,
484         .name  = "ecryptfs",
485         .fops  = &ecryptfs_miscdev_fops
486 };
487 
488 /**
489  * ecryptfs_init_ecryptfs_miscdev
490  *
491  * Messages sent to the userspace daemon from the kernel are placed on
492  * a queue associated with the daemon. The next read against the
493  * miscdev handle by that daemon will return the oldest message placed
494  * on the message queue for the daemon.
495  *
496  * Returns zero on success; non-zero otherwise
497  */
498 int __init ecryptfs_init_ecryptfs_miscdev(void)
499 {
500         int rc;
501 
502         atomic_set(&ecryptfs_num_miscdev_opens, 0);
503         rc = misc_register(&ecryptfs_miscdev);
504         if (rc)
505                 printk(KERN_ERR "%s: Failed to register miscellaneous device "
506                        "for communications with userspace daemons; rc = [%d]\n",
507                        __func__, rc);
508         return rc;
509 }
510 
511 /**
512  * ecryptfs_destroy_ecryptfs_miscdev
513  *
514  * All of the daemons must be exorcised prior to calling this
515  * function.
516  */
517 void ecryptfs_destroy_ecryptfs_miscdev(void)
518 {
519         BUG_ON(atomic_read(&ecryptfs_num_miscdev_opens) != 0);
520         misc_deregister(&ecryptfs_miscdev);
521 }
522 

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