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TOMOYO Linux Cross Reference
Linux/fs/ecryptfs/mmap.c

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  1 /**
  2  * eCryptfs: Linux filesystem encryption layer
  3  * This is where eCryptfs coordinates the symmetric encryption and
  4  * decryption of the file data as it passes between the lower
  5  * encrypted file and the upper decrypted file.
  6  *
  7  * Copyright (C) 1997-2003 Erez Zadok
  8  * Copyright (C) 2001-2003 Stony Brook University
  9  * Copyright (C) 2004-2007 International Business Machines Corp.
 10  *   Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
 11  *
 12  * This program is free software; you can redistribute it and/or
 13  * modify it under the terms of the GNU General Public License as
 14  * published by the Free Software Foundation; either version 2 of the
 15  * License, or (at your option) any later version.
 16  *
 17  * This program is distributed in the hope that it will be useful, but
 18  * WITHOUT ANY WARRANTY; without even the implied warranty of
 19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 20  * General Public License for more details.
 21  *
 22  * You should have received a copy of the GNU General Public License
 23  * along with this program; if not, write to the Free Software
 24  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 25  * 02111-1307, USA.
 26  */
 27 
 28 #include <linux/pagemap.h>
 29 #include <linux/writeback.h>
 30 #include <linux/page-flags.h>
 31 #include <linux/mount.h>
 32 #include <linux/file.h>
 33 #include <linux/crypto.h>
 34 #include <linux/scatterlist.h>
 35 #include <linux/slab.h>
 36 #include <asm/unaligned.h>
 37 #include "ecryptfs_kernel.h"
 38 
 39 /**
 40  * ecryptfs_get_locked_page
 41  *
 42  * Get one page from cache or lower f/s, return error otherwise.
 43  *
 44  * Returns locked and up-to-date page (if ok), with increased
 45  * refcnt.
 46  */
 47 struct page *ecryptfs_get_locked_page(struct inode *inode, loff_t index)
 48 {
 49         struct page *page = read_mapping_page(inode->i_mapping, index, NULL);
 50         if (!IS_ERR(page))
 51                 lock_page(page);
 52         return page;
 53 }
 54 
 55 /**
 56  * ecryptfs_writepage
 57  * @page: Page that is locked before this call is made
 58  *
 59  * Returns zero on success; non-zero otherwise
 60  *
 61  * This is where we encrypt the data and pass the encrypted data to
 62  * the lower filesystem.  In OpenPGP-compatible mode, we operate on
 63  * entire underlying packets.
 64  */
 65 static int ecryptfs_writepage(struct page *page, struct writeback_control *wbc)
 66 {
 67         int rc;
 68 
 69         /*
 70          * Refuse to write the page out if we are called from reclaim context
 71          * since our writepage() path may potentially allocate memory when
 72          * calling into the lower fs vfs_write() which may in turn invoke
 73          * us again.
 74          */
 75         if (current->flags & PF_MEMALLOC) {
 76                 redirty_page_for_writepage(wbc, page);
 77                 rc = 0;
 78                 goto out;
 79         }
 80 
 81         rc = ecryptfs_encrypt_page(page);
 82         if (rc) {
 83                 ecryptfs_printk(KERN_WARNING, "Error encrypting "
 84                                 "page (upper index [0x%.16lx])\n", page->index);
 85                 ClearPageUptodate(page);
 86                 goto out;
 87         }
 88         SetPageUptodate(page);
 89 out:
 90         unlock_page(page);
 91         return rc;
 92 }
 93 
 94 static void strip_xattr_flag(char *page_virt,
 95                              struct ecryptfs_crypt_stat *crypt_stat)
 96 {
 97         if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) {
 98                 size_t written;
 99 
100                 crypt_stat->flags &= ~ECRYPTFS_METADATA_IN_XATTR;
101                 ecryptfs_write_crypt_stat_flags(page_virt, crypt_stat,
102                                                 &written);
103                 crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
104         }
105 }
106 
107 /**
108  *   Header Extent:
109  *     Octets 0-7:        Unencrypted file size (big-endian)
110  *     Octets 8-15:       eCryptfs special marker
111  *     Octets 16-19:      Flags
112  *      Octet 16:         File format version number (between 0 and 255)
113  *      Octets 17-18:     Reserved
114  *      Octet 19:         Bit 1 (lsb): Reserved
115  *                        Bit 2: Encrypted?
116  *                        Bits 3-8: Reserved
117  *     Octets 20-23:      Header extent size (big-endian)
118  *     Octets 24-25:      Number of header extents at front of file
119  *                        (big-endian)
120  *     Octet  26:         Begin RFC 2440 authentication token packet set
121  */
122 
123 /**
124  * ecryptfs_copy_up_encrypted_with_header
125  * @page: Sort of a ``virtual'' representation of the encrypted lower
126  *        file. The actual lower file does not have the metadata in
127  *        the header. This is locked.
128  * @crypt_stat: The eCryptfs inode's cryptographic context
129  *
130  * The ``view'' is the version of the file that userspace winds up
131  * seeing, with the header information inserted.
132  */
133 static int
134 ecryptfs_copy_up_encrypted_with_header(struct page *page,
135                                        struct ecryptfs_crypt_stat *crypt_stat)
136 {
137         loff_t extent_num_in_page = 0;
138         loff_t num_extents_per_page = (PAGE_CACHE_SIZE
139                                        / crypt_stat->extent_size);
140         int rc = 0;
141 
142         while (extent_num_in_page < num_extents_per_page) {
143                 loff_t view_extent_num = ((((loff_t)page->index)
144                                            * num_extents_per_page)
145                                           + extent_num_in_page);
146                 size_t num_header_extents_at_front =
147                         (crypt_stat->metadata_size / crypt_stat->extent_size);
148 
149                 if (view_extent_num < num_header_extents_at_front) {
150                         /* This is a header extent */
151                         char *page_virt;
152 
153                         page_virt = kmap_atomic(page);
154                         memset(page_virt, 0, PAGE_CACHE_SIZE);
155                         /* TODO: Support more than one header extent */
156                         if (view_extent_num == 0) {
157                                 size_t written;
158 
159                                 rc = ecryptfs_read_xattr_region(
160                                         page_virt, page->mapping->host);
161                                 strip_xattr_flag(page_virt + 16, crypt_stat);
162                                 ecryptfs_write_header_metadata(page_virt + 20,
163                                                                crypt_stat,
164                                                                &written);
165                         }
166                         kunmap_atomic(page_virt);
167                         flush_dcache_page(page);
168                         if (rc) {
169                                 printk(KERN_ERR "%s: Error reading xattr "
170                                        "region; rc = [%d]\n", __func__, rc);
171                                 goto out;
172                         }
173                 } else {
174                         /* This is an encrypted data extent */
175                         loff_t lower_offset =
176                                 ((view_extent_num * crypt_stat->extent_size)
177                                  - crypt_stat->metadata_size);
178 
179                         rc = ecryptfs_read_lower_page_segment(
180                                 page, (lower_offset >> PAGE_CACHE_SHIFT),
181                                 (lower_offset & ~PAGE_CACHE_MASK),
182                                 crypt_stat->extent_size, page->mapping->host);
183                         if (rc) {
184                                 printk(KERN_ERR "%s: Error attempting to read "
185                                        "extent at offset [%lld] in the lower "
186                                        "file; rc = [%d]\n", __func__,
187                                        lower_offset, rc);
188                                 goto out;
189                         }
190                 }
191                 extent_num_in_page++;
192         }
193 out:
194         return rc;
195 }
196 
197 /**
198  * ecryptfs_readpage
199  * @file: An eCryptfs file
200  * @page: Page from eCryptfs inode mapping into which to stick the read data
201  *
202  * Read in a page, decrypting if necessary.
203  *
204  * Returns zero on success; non-zero on error.
205  */
206 static int ecryptfs_readpage(struct file *file, struct page *page)
207 {
208         struct ecryptfs_crypt_stat *crypt_stat =
209                 &ecryptfs_inode_to_private(page->mapping->host)->crypt_stat;
210         int rc = 0;
211 
212         if (!crypt_stat || !(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
213                 rc = ecryptfs_read_lower_page_segment(page, page->index, 0,
214                                                       PAGE_CACHE_SIZE,
215                                                       page->mapping->host);
216         } else if (crypt_stat->flags & ECRYPTFS_VIEW_AS_ENCRYPTED) {
217                 if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) {
218                         rc = ecryptfs_copy_up_encrypted_with_header(page,
219                                                                     crypt_stat);
220                         if (rc) {
221                                 printk(KERN_ERR "%s: Error attempting to copy "
222                                        "the encrypted content from the lower "
223                                        "file whilst inserting the metadata "
224                                        "from the xattr into the header; rc = "
225                                        "[%d]\n", __func__, rc);
226                                 goto out;
227                         }
228 
229                 } else {
230                         rc = ecryptfs_read_lower_page_segment(
231                                 page, page->index, 0, PAGE_CACHE_SIZE,
232                                 page->mapping->host);
233                         if (rc) {
234                                 printk(KERN_ERR "Error reading page; rc = "
235                                        "[%d]\n", rc);
236                                 goto out;
237                         }
238                 }
239         } else {
240                 rc = ecryptfs_decrypt_page(page);
241                 if (rc) {
242                         ecryptfs_printk(KERN_ERR, "Error decrypting page; "
243                                         "rc = [%d]\n", rc);
244                         goto out;
245                 }
246         }
247 out:
248         if (rc)
249                 ClearPageUptodate(page);
250         else
251                 SetPageUptodate(page);
252         ecryptfs_printk(KERN_DEBUG, "Unlocking page with index = [0x%.16lx]\n",
253                         page->index);
254         unlock_page(page);
255         return rc;
256 }
257 
258 /**
259  * Called with lower inode mutex held.
260  */
261 static int fill_zeros_to_end_of_page(struct page *page, unsigned int to)
262 {
263         struct inode *inode = page->mapping->host;
264         int end_byte_in_page;
265 
266         if ((i_size_read(inode) / PAGE_CACHE_SIZE) != page->index)
267                 goto out;
268         end_byte_in_page = i_size_read(inode) % PAGE_CACHE_SIZE;
269         if (to > end_byte_in_page)
270                 end_byte_in_page = to;
271         zero_user_segment(page, end_byte_in_page, PAGE_CACHE_SIZE);
272 out:
273         return 0;
274 }
275 
276 /**
277  * ecryptfs_write_begin
278  * @file: The eCryptfs file
279  * @mapping: The eCryptfs object
280  * @pos: The file offset at which to start writing
281  * @len: Length of the write
282  * @flags: Various flags
283  * @pagep: Pointer to return the page
284  * @fsdata: Pointer to return fs data (unused)
285  *
286  * This function must zero any hole we create
287  *
288  * Returns zero on success; non-zero otherwise
289  */
290 static int ecryptfs_write_begin(struct file *file,
291                         struct address_space *mapping,
292                         loff_t pos, unsigned len, unsigned flags,
293                         struct page **pagep, void **fsdata)
294 {
295         pgoff_t index = pos >> PAGE_CACHE_SHIFT;
296         struct page *page;
297         loff_t prev_page_end_size;
298         int rc = 0;
299 
300         page = grab_cache_page_write_begin(mapping, index, flags);
301         if (!page)
302                 return -ENOMEM;
303         *pagep = page;
304 
305         prev_page_end_size = ((loff_t)index << PAGE_CACHE_SHIFT);
306         if (!PageUptodate(page)) {
307                 struct ecryptfs_crypt_stat *crypt_stat =
308                         &ecryptfs_inode_to_private(mapping->host)->crypt_stat;
309 
310                 if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
311                         rc = ecryptfs_read_lower_page_segment(
312                                 page, index, 0, PAGE_CACHE_SIZE, mapping->host);
313                         if (rc) {
314                                 printk(KERN_ERR "%s: Error attemping to read "
315                                        "lower page segment; rc = [%d]\n",
316                                        __func__, rc);
317                                 ClearPageUptodate(page);
318                                 goto out;
319                         } else
320                                 SetPageUptodate(page);
321                 } else if (crypt_stat->flags & ECRYPTFS_VIEW_AS_ENCRYPTED) {
322                         if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) {
323                                 rc = ecryptfs_copy_up_encrypted_with_header(
324                                         page, crypt_stat);
325                                 if (rc) {
326                                         printk(KERN_ERR "%s: Error attempting "
327                                                "to copy the encrypted content "
328                                                "from the lower file whilst "
329                                                "inserting the metadata from "
330                                                "the xattr into the header; rc "
331                                                "= [%d]\n", __func__, rc);
332                                         ClearPageUptodate(page);
333                                         goto out;
334                                 }
335                                 SetPageUptodate(page);
336                         } else {
337                                 rc = ecryptfs_read_lower_page_segment(
338                                         page, index, 0, PAGE_CACHE_SIZE,
339                                         mapping->host);
340                                 if (rc) {
341                                         printk(KERN_ERR "%s: Error reading "
342                                                "page; rc = [%d]\n",
343                                                __func__, rc);
344                                         ClearPageUptodate(page);
345                                         goto out;
346                                 }
347                                 SetPageUptodate(page);
348                         }
349                 } else {
350                         if (prev_page_end_size
351                             >= i_size_read(page->mapping->host)) {
352                                 zero_user(page, 0, PAGE_CACHE_SIZE);
353                         } else {
354                                 rc = ecryptfs_decrypt_page(page);
355                                 if (rc) {
356                                         printk(KERN_ERR "%s: Error decrypting "
357                                                "page at index [%ld]; "
358                                                "rc = [%d]\n",
359                                                __func__, page->index, rc);
360                                         ClearPageUptodate(page);
361                                         goto out;
362                                 }
363                         }
364                         SetPageUptodate(page);
365                 }
366         }
367         /* If creating a page or more of holes, zero them out via truncate.
368          * Note, this will increase i_size. */
369         if (index != 0) {
370                 if (prev_page_end_size > i_size_read(page->mapping->host)) {
371                         rc = ecryptfs_truncate(file->f_path.dentry,
372                                                prev_page_end_size);
373                         if (rc) {
374                                 printk(KERN_ERR "%s: Error on attempt to "
375                                        "truncate to (higher) offset [%lld];"
376                                        " rc = [%d]\n", __func__,
377                                        prev_page_end_size, rc);
378                                 goto out;
379                         }
380                 }
381         }
382         /* Writing to a new page, and creating a small hole from start
383          * of page?  Zero it out. */
384         if ((i_size_read(mapping->host) == prev_page_end_size)
385             && (pos != 0))
386                 zero_user(page, 0, PAGE_CACHE_SIZE);
387 out:
388         if (unlikely(rc)) {
389                 unlock_page(page);
390                 page_cache_release(page);
391                 *pagep = NULL;
392         }
393         return rc;
394 }
395 
396 /**
397  * ecryptfs_write_inode_size_to_header
398  *
399  * Writes the lower file size to the first 8 bytes of the header.
400  *
401  * Returns zero on success; non-zero on error.
402  */
403 static int ecryptfs_write_inode_size_to_header(struct inode *ecryptfs_inode)
404 {
405         char *file_size_virt;
406         int rc;
407 
408         file_size_virt = kmalloc(sizeof(u64), GFP_KERNEL);
409         if (!file_size_virt) {
410                 rc = -ENOMEM;
411                 goto out;
412         }
413         put_unaligned_be64(i_size_read(ecryptfs_inode), file_size_virt);
414         rc = ecryptfs_write_lower(ecryptfs_inode, file_size_virt, 0,
415                                   sizeof(u64));
416         kfree(file_size_virt);
417         if (rc < 0)
418                 printk(KERN_ERR "%s: Error writing file size to header; "
419                        "rc = [%d]\n", __func__, rc);
420         else
421                 rc = 0;
422 out:
423         return rc;
424 }
425 
426 struct kmem_cache *ecryptfs_xattr_cache;
427 
428 static int ecryptfs_write_inode_size_to_xattr(struct inode *ecryptfs_inode)
429 {
430         ssize_t size;
431         void *xattr_virt;
432         struct dentry *lower_dentry =
433                 ecryptfs_inode_to_private(ecryptfs_inode)->lower_file->f_dentry;
434         struct inode *lower_inode = lower_dentry->d_inode;
435         int rc;
436 
437         if (!lower_inode->i_op->getxattr || !lower_inode->i_op->setxattr) {
438                 printk(KERN_WARNING
439                        "No support for setting xattr in lower filesystem\n");
440                 rc = -ENOSYS;
441                 goto out;
442         }
443         xattr_virt = kmem_cache_alloc(ecryptfs_xattr_cache, GFP_KERNEL);
444         if (!xattr_virt) {
445                 printk(KERN_ERR "Out of memory whilst attempting to write "
446                        "inode size to xattr\n");
447                 rc = -ENOMEM;
448                 goto out;
449         }
450         mutex_lock(&lower_inode->i_mutex);
451         size = lower_inode->i_op->getxattr(lower_dentry, ECRYPTFS_XATTR_NAME,
452                                            xattr_virt, PAGE_CACHE_SIZE);
453         if (size < 0)
454                 size = 8;
455         put_unaligned_be64(i_size_read(ecryptfs_inode), xattr_virt);
456         rc = lower_inode->i_op->setxattr(lower_dentry, ECRYPTFS_XATTR_NAME,
457                                          xattr_virt, size, 0);
458         mutex_unlock(&lower_inode->i_mutex);
459         if (rc)
460                 printk(KERN_ERR "Error whilst attempting to write inode size "
461                        "to lower file xattr; rc = [%d]\n", rc);
462         kmem_cache_free(ecryptfs_xattr_cache, xattr_virt);
463 out:
464         return rc;
465 }
466 
467 int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode)
468 {
469         struct ecryptfs_crypt_stat *crypt_stat;
470 
471         crypt_stat = &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat;
472         BUG_ON(!(crypt_stat->flags & ECRYPTFS_ENCRYPTED));
473         if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
474                 return ecryptfs_write_inode_size_to_xattr(ecryptfs_inode);
475         else
476                 return ecryptfs_write_inode_size_to_header(ecryptfs_inode);
477 }
478 
479 /**
480  * ecryptfs_write_end
481  * @file: The eCryptfs file object
482  * @mapping: The eCryptfs object
483  * @pos: The file position
484  * @len: The length of the data (unused)
485  * @copied: The amount of data copied
486  * @page: The eCryptfs page
487  * @fsdata: The fsdata (unused)
488  */
489 static int ecryptfs_write_end(struct file *file,
490                         struct address_space *mapping,
491                         loff_t pos, unsigned len, unsigned copied,
492                         struct page *page, void *fsdata)
493 {
494         pgoff_t index = pos >> PAGE_CACHE_SHIFT;
495         unsigned from = pos & (PAGE_CACHE_SIZE - 1);
496         unsigned to = from + copied;
497         struct inode *ecryptfs_inode = mapping->host;
498         struct ecryptfs_crypt_stat *crypt_stat =
499                 &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat;
500         int rc;
501         int need_unlock_page = 1;
502 
503         ecryptfs_printk(KERN_DEBUG, "Calling fill_zeros_to_end_of_page"
504                         "(page w/ index = [0x%.16lx], to = [%d])\n", index, to);
505         if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
506                 rc = ecryptfs_write_lower_page_segment(ecryptfs_inode, page, 0,
507                                                        to);
508                 if (!rc) {
509                         rc = copied;
510                         fsstack_copy_inode_size(ecryptfs_inode,
511                                 ecryptfs_inode_to_lower(ecryptfs_inode));
512                 }
513                 goto out;
514         }
515         /* Fills in zeros if 'to' goes beyond inode size */
516         rc = fill_zeros_to_end_of_page(page, to);
517         if (rc) {
518                 ecryptfs_printk(KERN_WARNING, "Error attempting to fill "
519                         "zeros in page with index = [0x%.16lx]\n", index);
520                 goto out;
521         }
522         set_page_dirty(page);
523         unlock_page(page);
524         need_unlock_page = 0;
525         if (pos + copied > i_size_read(ecryptfs_inode)) {
526                 i_size_write(ecryptfs_inode, pos + copied);
527                 ecryptfs_printk(KERN_DEBUG, "Expanded file size to "
528                         "[0x%.16llx]\n",
529                         (unsigned long long)i_size_read(ecryptfs_inode));
530                 balance_dirty_pages_ratelimited(mapping);
531                 rc = ecryptfs_write_inode_size_to_metadata(ecryptfs_inode);
532                 if (rc) {
533                         printk(KERN_ERR "Error writing inode size to metadata; "
534                                "rc = [%d]\n", rc);
535                         goto out;
536                 }
537         }
538         rc = copied;
539 out:
540         if (need_unlock_page)
541                 unlock_page(page);
542         page_cache_release(page);
543         return rc;
544 }
545 
546 static sector_t ecryptfs_bmap(struct address_space *mapping, sector_t block)
547 {
548         int rc = 0;
549         struct inode *inode;
550         struct inode *lower_inode;
551 
552         inode = (struct inode *)mapping->host;
553         lower_inode = ecryptfs_inode_to_lower(inode);
554         if (lower_inode->i_mapping->a_ops->bmap)
555                 rc = lower_inode->i_mapping->a_ops->bmap(lower_inode->i_mapping,
556                                                          block);
557         return rc;
558 }
559 
560 const struct address_space_operations ecryptfs_aops = {
561         .writepage = ecryptfs_writepage,
562         .readpage = ecryptfs_readpage,
563         .write_begin = ecryptfs_write_begin,
564         .write_end = ecryptfs_write_end,
565         .bmap = ecryptfs_bmap,
566 };
567 

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