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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/scatterlist.h>
 34 #include <linux/slab.h>
 35 #include <linux/xattr.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         rc = ecryptfs_encrypt_page(page);
 70         if (rc) {
 71                 ecryptfs_printk(KERN_WARNING, "Error encrypting "
 72                                 "page (upper index [0x%.16lx])\n", page->index);
 73                 ClearPageUptodate(page);
 74                 goto out;
 75         }
 76         SetPageUptodate(page);
 77 out:
 78         unlock_page(page);
 79         return rc;
 80 }
 81 
 82 static void strip_xattr_flag(char *page_virt,
 83                              struct ecryptfs_crypt_stat *crypt_stat)
 84 {
 85         if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) {
 86                 size_t written;
 87 
 88                 crypt_stat->flags &= ~ECRYPTFS_METADATA_IN_XATTR;
 89                 ecryptfs_write_crypt_stat_flags(page_virt, crypt_stat,
 90                                                 &written);
 91                 crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
 92         }
 93 }
 94 
 95 /**
 96  *   Header Extent:
 97  *     Octets 0-7:        Unencrypted file size (big-endian)
 98  *     Octets 8-15:       eCryptfs special marker
 99  *     Octets 16-19:      Flags
100  *      Octet 16:         File format version number (between 0 and 255)
101  *      Octets 17-18:     Reserved
102  *      Octet 19:         Bit 1 (lsb): Reserved
103  *                        Bit 2: Encrypted?
104  *                        Bits 3-8: Reserved
105  *     Octets 20-23:      Header extent size (big-endian)
106  *     Octets 24-25:      Number of header extents at front of file
107  *                        (big-endian)
108  *     Octet  26:         Begin RFC 2440 authentication token packet set
109  */
110 
111 /**
112  * ecryptfs_copy_up_encrypted_with_header
113  * @page: Sort of a ``virtual'' representation of the encrypted lower
114  *        file. The actual lower file does not have the metadata in
115  *        the header. This is locked.
116  * @crypt_stat: The eCryptfs inode's cryptographic context
117  *
118  * The ``view'' is the version of the file that userspace winds up
119  * seeing, with the header information inserted.
120  */
121 static int
122 ecryptfs_copy_up_encrypted_with_header(struct page *page,
123                                        struct ecryptfs_crypt_stat *crypt_stat)
124 {
125         loff_t extent_num_in_page = 0;
126         loff_t num_extents_per_page = (PAGE_SIZE
127                                        / crypt_stat->extent_size);
128         int rc = 0;
129 
130         while (extent_num_in_page < num_extents_per_page) {
131                 loff_t view_extent_num = ((((loff_t)page->index)
132                                            * num_extents_per_page)
133                                           + extent_num_in_page);
134                 size_t num_header_extents_at_front =
135                         (crypt_stat->metadata_size / crypt_stat->extent_size);
136 
137                 if (view_extent_num < num_header_extents_at_front) {
138                         /* This is a header extent */
139                         char *page_virt;
140 
141                         page_virt = kmap_atomic(page);
142                         memset(page_virt, 0, PAGE_SIZE);
143                         /* TODO: Support more than one header extent */
144                         if (view_extent_num == 0) {
145                                 size_t written;
146 
147                                 rc = ecryptfs_read_xattr_region(
148                                         page_virt, page->mapping->host);
149                                 strip_xattr_flag(page_virt + 16, crypt_stat);
150                                 ecryptfs_write_header_metadata(page_virt + 20,
151                                                                crypt_stat,
152                                                                &written);
153                         }
154                         kunmap_atomic(page_virt);
155                         flush_dcache_page(page);
156                         if (rc) {
157                                 printk(KERN_ERR "%s: Error reading xattr "
158                                        "region; rc = [%d]\n", __func__, rc);
159                                 goto out;
160                         }
161                 } else {
162                         /* This is an encrypted data extent */
163                         loff_t lower_offset =
164                                 ((view_extent_num * crypt_stat->extent_size)
165                                  - crypt_stat->metadata_size);
166 
167                         rc = ecryptfs_read_lower_page_segment(
168                                 page, (lower_offset >> PAGE_SHIFT),
169                                 (lower_offset & ~PAGE_MASK),
170                                 crypt_stat->extent_size, page->mapping->host);
171                         if (rc) {
172                                 printk(KERN_ERR "%s: Error attempting to read "
173                                        "extent at offset [%lld] in the lower "
174                                        "file; rc = [%d]\n", __func__,
175                                        lower_offset, rc);
176                                 goto out;
177                         }
178                 }
179                 extent_num_in_page++;
180         }
181 out:
182         return rc;
183 }
184 
185 /**
186  * ecryptfs_readpage
187  * @file: An eCryptfs file
188  * @page: Page from eCryptfs inode mapping into which to stick the read data
189  *
190  * Read in a page, decrypting if necessary.
191  *
192  * Returns zero on success; non-zero on error.
193  */
194 static int ecryptfs_readpage(struct file *file, struct page *page)
195 {
196         struct ecryptfs_crypt_stat *crypt_stat =
197                 &ecryptfs_inode_to_private(page->mapping->host)->crypt_stat;
198         int rc = 0;
199 
200         if (!crypt_stat || !(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
201                 rc = ecryptfs_read_lower_page_segment(page, page->index, 0,
202                                                       PAGE_SIZE,
203                                                       page->mapping->host);
204         } else if (crypt_stat->flags & ECRYPTFS_VIEW_AS_ENCRYPTED) {
205                 if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) {
206                         rc = ecryptfs_copy_up_encrypted_with_header(page,
207                                                                     crypt_stat);
208                         if (rc) {
209                                 printk(KERN_ERR "%s: Error attempting to copy "
210                                        "the encrypted content from the lower "
211                                        "file whilst inserting the metadata "
212                                        "from the xattr into the header; rc = "
213                                        "[%d]\n", __func__, rc);
214                                 goto out;
215                         }
216 
217                 } else {
218                         rc = ecryptfs_read_lower_page_segment(
219                                 page, page->index, 0, PAGE_SIZE,
220                                 page->mapping->host);
221                         if (rc) {
222                                 printk(KERN_ERR "Error reading page; rc = "
223                                        "[%d]\n", rc);
224                                 goto out;
225                         }
226                 }
227         } else {
228                 rc = ecryptfs_decrypt_page(page);
229                 if (rc) {
230                         ecryptfs_printk(KERN_ERR, "Error decrypting page; "
231                                         "rc = [%d]\n", rc);
232                         goto out;
233                 }
234         }
235 out:
236         if (rc)
237                 ClearPageUptodate(page);
238         else
239                 SetPageUptodate(page);
240         ecryptfs_printk(KERN_DEBUG, "Unlocking page with index = [0x%.16lx]\n",
241                         page->index);
242         unlock_page(page);
243         return rc;
244 }
245 
246 /**
247  * Called with lower inode mutex held.
248  */
249 static int fill_zeros_to_end_of_page(struct page *page, unsigned int to)
250 {
251         struct inode *inode = page->mapping->host;
252         int end_byte_in_page;
253 
254         if ((i_size_read(inode) / PAGE_SIZE) != page->index)
255                 goto out;
256         end_byte_in_page = i_size_read(inode) % PAGE_SIZE;
257         if (to > end_byte_in_page)
258                 end_byte_in_page = to;
259         zero_user_segment(page, end_byte_in_page, PAGE_SIZE);
260 out:
261         return 0;
262 }
263 
264 /**
265  * ecryptfs_write_begin
266  * @file: The eCryptfs file
267  * @mapping: The eCryptfs object
268  * @pos: The file offset at which to start writing
269  * @len: Length of the write
270  * @flags: Various flags
271  * @pagep: Pointer to return the page
272  * @fsdata: Pointer to return fs data (unused)
273  *
274  * This function must zero any hole we create
275  *
276  * Returns zero on success; non-zero otherwise
277  */
278 static int ecryptfs_write_begin(struct file *file,
279                         struct address_space *mapping,
280                         loff_t pos, unsigned len, unsigned flags,
281                         struct page **pagep, void **fsdata)
282 {
283         pgoff_t index = pos >> PAGE_SHIFT;
284         struct page *page;
285         loff_t prev_page_end_size;
286         int rc = 0;
287 
288         page = grab_cache_page_write_begin(mapping, index, flags);
289         if (!page)
290                 return -ENOMEM;
291         *pagep = page;
292 
293         prev_page_end_size = ((loff_t)index << PAGE_SHIFT);
294         if (!PageUptodate(page)) {
295                 struct ecryptfs_crypt_stat *crypt_stat =
296                         &ecryptfs_inode_to_private(mapping->host)->crypt_stat;
297 
298                 if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
299                         rc = ecryptfs_read_lower_page_segment(
300                                 page, index, 0, PAGE_SIZE, mapping->host);
301                         if (rc) {
302                                 printk(KERN_ERR "%s: Error attempting to read "
303                                        "lower page segment; rc = [%d]\n",
304                                        __func__, rc);
305                                 ClearPageUptodate(page);
306                                 goto out;
307                         } else
308                                 SetPageUptodate(page);
309                 } else if (crypt_stat->flags & ECRYPTFS_VIEW_AS_ENCRYPTED) {
310                         if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) {
311                                 rc = ecryptfs_copy_up_encrypted_with_header(
312                                         page, crypt_stat);
313                                 if (rc) {
314                                         printk(KERN_ERR "%s: Error attempting "
315                                                "to copy the encrypted content "
316                                                "from the lower file whilst "
317                                                "inserting the metadata from "
318                                                "the xattr into the header; rc "
319                                                "= [%d]\n", __func__, rc);
320                                         ClearPageUptodate(page);
321                                         goto out;
322                                 }
323                                 SetPageUptodate(page);
324                         } else {
325                                 rc = ecryptfs_read_lower_page_segment(
326                                         page, index, 0, PAGE_SIZE,
327                                         mapping->host);
328                                 if (rc) {
329                                         printk(KERN_ERR "%s: Error reading "
330                                                "page; rc = [%d]\n",
331                                                __func__, rc);
332                                         ClearPageUptodate(page);
333                                         goto out;
334                                 }
335                                 SetPageUptodate(page);
336                         }
337                 } else {
338                         if (prev_page_end_size
339                             >= i_size_read(page->mapping->host)) {
340                                 zero_user(page, 0, PAGE_SIZE);
341                                 SetPageUptodate(page);
342                         } else if (len < PAGE_SIZE) {
343                                 rc = ecryptfs_decrypt_page(page);
344                                 if (rc) {
345                                         printk(KERN_ERR "%s: Error decrypting "
346                                                "page at index [%ld]; "
347                                                "rc = [%d]\n",
348                                                __func__, page->index, rc);
349                                         ClearPageUptodate(page);
350                                         goto out;
351                                 }
352                                 SetPageUptodate(page);
353                         }
354                 }
355         }
356         /* If creating a page or more of holes, zero them out via truncate.
357          * Note, this will increase i_size. */
358         if (index != 0) {
359                 if (prev_page_end_size > i_size_read(page->mapping->host)) {
360                         rc = ecryptfs_truncate(file->f_path.dentry,
361                                                prev_page_end_size);
362                         if (rc) {
363                                 printk(KERN_ERR "%s: Error on attempt to "
364                                        "truncate to (higher) offset [%lld];"
365                                        " rc = [%d]\n", __func__,
366                                        prev_page_end_size, rc);
367                                 goto out;
368                         }
369                 }
370         }
371         /* Writing to a new page, and creating a small hole from start
372          * of page?  Zero it out. */
373         if ((i_size_read(mapping->host) == prev_page_end_size)
374             && (pos != 0))
375                 zero_user(page, 0, PAGE_SIZE);
376 out:
377         if (unlikely(rc)) {
378                 unlock_page(page);
379                 put_page(page);
380                 *pagep = NULL;
381         }
382         return rc;
383 }
384 
385 /**
386  * ecryptfs_write_inode_size_to_header
387  *
388  * Writes the lower file size to the first 8 bytes of the header.
389  *
390  * Returns zero on success; non-zero on error.
391  */
392 static int ecryptfs_write_inode_size_to_header(struct inode *ecryptfs_inode)
393 {
394         char *file_size_virt;
395         int rc;
396 
397         file_size_virt = kmalloc(sizeof(u64), GFP_KERNEL);
398         if (!file_size_virt) {
399                 rc = -ENOMEM;
400                 goto out;
401         }
402         put_unaligned_be64(i_size_read(ecryptfs_inode), file_size_virt);
403         rc = ecryptfs_write_lower(ecryptfs_inode, file_size_virt, 0,
404                                   sizeof(u64));
405         kfree(file_size_virt);
406         if (rc < 0)
407                 printk(KERN_ERR "%s: Error writing file size to header; "
408                        "rc = [%d]\n", __func__, rc);
409         else
410                 rc = 0;
411 out:
412         return rc;
413 }
414 
415 struct kmem_cache *ecryptfs_xattr_cache;
416 
417 static int ecryptfs_write_inode_size_to_xattr(struct inode *ecryptfs_inode)
418 {
419         ssize_t size;
420         void *xattr_virt;
421         struct dentry *lower_dentry =
422                 ecryptfs_inode_to_private(ecryptfs_inode)->lower_file->f_path.dentry;
423         struct inode *lower_inode = d_inode(lower_dentry);
424         int rc;
425 
426         if (!(lower_inode->i_opflags & IOP_XATTR)) {
427                 printk(KERN_WARNING
428                        "No support for setting xattr in lower filesystem\n");
429                 rc = -ENOSYS;
430                 goto out;
431         }
432         xattr_virt = kmem_cache_alloc(ecryptfs_xattr_cache, GFP_KERNEL);
433         if (!xattr_virt) {
434                 rc = -ENOMEM;
435                 goto out;
436         }
437         inode_lock(lower_inode);
438         size = __vfs_getxattr(lower_dentry, lower_inode, ECRYPTFS_XATTR_NAME,
439                               xattr_virt, PAGE_SIZE);
440         if (size < 0)
441                 size = 8;
442         put_unaligned_be64(i_size_read(ecryptfs_inode), xattr_virt);
443         rc = __vfs_setxattr(lower_dentry, lower_inode, ECRYPTFS_XATTR_NAME,
444                             xattr_virt, size, 0);
445         inode_unlock(lower_inode);
446         if (rc)
447                 printk(KERN_ERR "Error whilst attempting to write inode size "
448                        "to lower file xattr; rc = [%d]\n", rc);
449         kmem_cache_free(ecryptfs_xattr_cache, xattr_virt);
450 out:
451         return rc;
452 }
453 
454 int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode)
455 {
456         struct ecryptfs_crypt_stat *crypt_stat;
457 
458         crypt_stat = &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat;
459         BUG_ON(!(crypt_stat->flags & ECRYPTFS_ENCRYPTED));
460         if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
461                 return ecryptfs_write_inode_size_to_xattr(ecryptfs_inode);
462         else
463                 return ecryptfs_write_inode_size_to_header(ecryptfs_inode);
464 }
465 
466 /**
467  * ecryptfs_write_end
468  * @file: The eCryptfs file object
469  * @mapping: The eCryptfs object
470  * @pos: The file position
471  * @len: The length of the data (unused)
472  * @copied: The amount of data copied
473  * @page: The eCryptfs page
474  * @fsdata: The fsdata (unused)
475  */
476 static int ecryptfs_write_end(struct file *file,
477                         struct address_space *mapping,
478                         loff_t pos, unsigned len, unsigned copied,
479                         struct page *page, void *fsdata)
480 {
481         pgoff_t index = pos >> PAGE_SHIFT;
482         unsigned from = pos & (PAGE_SIZE - 1);
483         unsigned to = from + copied;
484         struct inode *ecryptfs_inode = mapping->host;
485         struct ecryptfs_crypt_stat *crypt_stat =
486                 &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat;
487         int rc;
488 
489         ecryptfs_printk(KERN_DEBUG, "Calling fill_zeros_to_end_of_page"
490                         "(page w/ index = [0x%.16lx], to = [%d])\n", index, to);
491         if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
492                 rc = ecryptfs_write_lower_page_segment(ecryptfs_inode, page, 0,
493                                                        to);
494                 if (!rc) {
495                         rc = copied;
496                         fsstack_copy_inode_size(ecryptfs_inode,
497                                 ecryptfs_inode_to_lower(ecryptfs_inode));
498                 }
499                 goto out;
500         }
501         if (!PageUptodate(page)) {
502                 if (copied < PAGE_SIZE) {
503                         rc = 0;
504                         goto out;
505                 }
506                 SetPageUptodate(page);
507         }
508         /* Fills in zeros if 'to' goes beyond inode size */
509         rc = fill_zeros_to_end_of_page(page, to);
510         if (rc) {
511                 ecryptfs_printk(KERN_WARNING, "Error attempting to fill "
512                         "zeros in page with index = [0x%.16lx]\n", index);
513                 goto out;
514         }
515         rc = ecryptfs_encrypt_page(page);
516         if (rc) {
517                 ecryptfs_printk(KERN_WARNING, "Error encrypting page (upper "
518                                 "index [0x%.16lx])\n", index);
519                 goto out;
520         }
521         if (pos + copied > i_size_read(ecryptfs_inode)) {
522                 i_size_write(ecryptfs_inode, pos + copied);
523                 ecryptfs_printk(KERN_DEBUG, "Expanded file size to "
524                         "[0x%.16llx]\n",
525                         (unsigned long long)i_size_read(ecryptfs_inode));
526         }
527         rc = ecryptfs_write_inode_size_to_metadata(ecryptfs_inode);
528         if (rc)
529                 printk(KERN_ERR "Error writing inode size to metadata; "
530                        "rc = [%d]\n", rc);
531         else
532                 rc = copied;
533 out:
534         unlock_page(page);
535         put_page(page);
536         return rc;
537 }
538 
539 static sector_t ecryptfs_bmap(struct address_space *mapping, sector_t block)
540 {
541         int rc = 0;
542         struct inode *inode;
543         struct inode *lower_inode;
544 
545         inode = (struct inode *)mapping->host;
546         lower_inode = ecryptfs_inode_to_lower(inode);
547         if (lower_inode->i_mapping->a_ops->bmap)
548                 rc = lower_inode->i_mapping->a_ops->bmap(lower_inode->i_mapping,
549                                                          block);
550         return rc;
551 }
552 
553 const struct address_space_operations ecryptfs_aops = {
554         .writepage = ecryptfs_writepage,
555         .readpage = ecryptfs_readpage,
556         .write_begin = ecryptfs_write_begin,
557         .write_end = ecryptfs_write_end,
558         .bmap = ecryptfs_bmap,
559 };
560 

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