Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1 | /** |
| 2 | * eCryptfs: Linux filesystem encryption layer |
| 3 | * |
| 4 | * Copyright (C) 1997-2004 Erez Zadok |
| 5 | * Copyright (C) 2001-2004 Stony Brook University |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame] | 6 | * Copyright (C) 2004-2007 International Business Machines Corp. |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 7 | * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com> |
| 8 | * Michael C. Thompsion <mcthomps@us.ibm.com> |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public License as |
| 12 | * published by the Free Software Foundation; either version 2 of the |
| 13 | * License, or (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, but |
| 16 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 18 | * General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program; if not, write to the Free Software |
| 22 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA |
| 23 | * 02111-1307, USA. |
| 24 | */ |
| 25 | |
| 26 | #include <linux/file.h> |
| 27 | #include <linux/vmalloc.h> |
| 28 | #include <linux/pagemap.h> |
| 29 | #include <linux/dcache.h> |
| 30 | #include <linux/namei.h> |
| 31 | #include <linux/mount.h> |
| 32 | #include <linux/crypto.h> |
Josef "Jeff" Sipek | 0cc72dc | 2006-12-08 02:36:31 -0800 | [diff] [blame] | 33 | #include <linux/fs_stack.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 34 | #include <linux/slab.h> |
Roberto Sassu | 48b512e | 2010-10-05 18:53:45 +0200 | [diff] [blame] | 35 | #include <linux/xattr.h> |
Harvey Harrison | 0a688ad | 2008-07-23 21:30:07 -0700 | [diff] [blame] | 36 | #include <asm/unaligned.h> |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 37 | #include "ecryptfs_kernel.h" |
| 38 | |
| 39 | static struct dentry *lock_parent(struct dentry *dentry) |
| 40 | { |
| 41 | struct dentry *dir; |
| 42 | |
Miklos Szeredi | 8dc4e37 | 2008-05-12 14:02:04 -0700 | [diff] [blame] | 43 | dir = dget_parent(dentry); |
Peter Zijlstra | 908e0a8 | 2007-03-07 20:41:30 -0800 | [diff] [blame] | 44 | mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 45 | return dir; |
| 46 | } |
| 47 | |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 48 | static void unlock_dir(struct dentry *dir) |
| 49 | { |
| 50 | mutex_unlock(&dir->d_inode->i_mutex); |
| 51 | dput(dir); |
| 52 | } |
| 53 | |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 54 | /** |
| 55 | * ecryptfs_create_underlying_file |
| 56 | * @lower_dir_inode: inode of the parent in the lower fs of the new file |
Qinghuang Feng | f70f582 | 2009-01-06 14:42:05 -0800 | [diff] [blame] | 57 | * @dentry: New file's dentry |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 58 | * @mode: The mode of the new file |
| 59 | * @nd: nameidata of ecryptfs' parent's dentry & vfsmount |
| 60 | * |
| 61 | * Creates the file in the lower file system. |
| 62 | * |
| 63 | * Returns zero on success; non-zero on error condition |
| 64 | */ |
| 65 | static int |
| 66 | ecryptfs_create_underlying_file(struct inode *lower_dir_inode, |
| 67 | struct dentry *dentry, int mode, |
| 68 | struct nameidata *nd) |
| 69 | { |
| 70 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 71 | struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); |
| 72 | struct dentry *dentry_save; |
| 73 | struct vfsmount *vfsmount_save; |
Tyler Hicks | 2e21b3f | 2010-09-23 02:35:04 -0500 | [diff] [blame] | 74 | unsigned int flags_save; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 75 | int rc; |
| 76 | |
Tyler Hicks | 70b8902 | 2011-02-17 17:35:20 -0600 | [diff] [blame] | 77 | if (nd) { |
| 78 | dentry_save = nd->path.dentry; |
| 79 | vfsmount_save = nd->path.mnt; |
| 80 | flags_save = nd->flags; |
| 81 | nd->path.dentry = lower_dentry; |
| 82 | nd->path.mnt = lower_mnt; |
| 83 | nd->flags &= ~LOOKUP_OPEN; |
| 84 | } |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 85 | rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd); |
Tyler Hicks | 70b8902 | 2011-02-17 17:35:20 -0600 | [diff] [blame] | 86 | if (nd) { |
| 87 | nd->path.dentry = dentry_save; |
| 88 | nd->path.mnt = vfsmount_save; |
| 89 | nd->flags = flags_save; |
| 90 | } |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 91 | return rc; |
| 92 | } |
| 93 | |
| 94 | /** |
| 95 | * ecryptfs_do_create |
| 96 | * @directory_inode: inode of the new file's dentry's parent in ecryptfs |
| 97 | * @ecryptfs_dentry: New file's dentry in ecryptfs |
| 98 | * @mode: The mode of the new file |
| 99 | * @nd: nameidata of ecryptfs' parent's dentry & vfsmount |
| 100 | * |
| 101 | * Creates the underlying file and the eCryptfs inode which will link to |
| 102 | * it. It will also update the eCryptfs directory inode to mimic the |
| 103 | * stat of the lower directory inode. |
| 104 | * |
| 105 | * Returns zero on success; non-zero on error condition |
| 106 | */ |
| 107 | static int |
| 108 | ecryptfs_do_create(struct inode *directory_inode, |
| 109 | struct dentry *ecryptfs_dentry, int mode, |
| 110 | struct nameidata *nd) |
| 111 | { |
| 112 | int rc; |
| 113 | struct dentry *lower_dentry; |
| 114 | struct dentry *lower_dir_dentry; |
| 115 | |
| 116 | lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); |
| 117 | lower_dir_dentry = lock_parent(lower_dentry); |
Hirofumi Nakagawa | 801678c | 2008-04-29 01:03:09 -0700 | [diff] [blame] | 118 | if (IS_ERR(lower_dir_dentry)) { |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 119 | ecryptfs_printk(KERN_ERR, "Error locking directory of " |
| 120 | "dentry\n"); |
| 121 | rc = PTR_ERR(lower_dir_dentry); |
| 122 | goto out; |
| 123 | } |
| 124 | rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode, |
| 125 | ecryptfs_dentry, mode, nd); |
Michael Halcrow | 4981e08 | 2007-10-16 01:28:09 -0700 | [diff] [blame] | 126 | if (rc) { |
Michael Halcrow | caeeeec | 2008-01-08 15:33:02 -0800 | [diff] [blame] | 127 | printk(KERN_ERR "%s: Failure to create dentry in lower fs; " |
Harvey Harrison | 18d1dbf | 2008-04-29 00:59:48 -0700 | [diff] [blame] | 128 | "rc = [%d]\n", __func__, rc); |
Michael Halcrow | caeeeec | 2008-01-08 15:33:02 -0800 | [diff] [blame] | 129 | goto out_lock; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 130 | } |
| 131 | rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, |
| 132 | directory_inode->i_sb, 0); |
| 133 | if (rc) { |
| 134 | ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n"); |
| 135 | goto out_lock; |
| 136 | } |
Josef "Jeff" Sipek | 0cc72dc | 2006-12-08 02:36:31 -0800 | [diff] [blame] | 137 | fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode); |
| 138 | fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 139 | out_lock: |
| 140 | unlock_dir(lower_dir_dentry); |
| 141 | out: |
| 142 | return rc; |
| 143 | } |
| 144 | |
| 145 | /** |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 146 | * ecryptfs_initialize_file |
| 147 | * |
| 148 | * Cause the file to be changed from a basic empty file to an ecryptfs |
| 149 | * file with a header and first data page. |
| 150 | * |
| 151 | * Returns zero on success |
| 152 | */ |
| 153 | static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry) |
| 154 | { |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 155 | struct ecryptfs_crypt_stat *crypt_stat = |
| 156 | &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 157 | int rc = 0; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 158 | |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 159 | if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) { |
| 160 | ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); |
Michael Halcrow | e2bd99e | 2007-02-12 00:53:49 -0800 | [diff] [blame] | 161 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 162 | goto out; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 163 | } |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 164 | ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); |
| 165 | rc = ecryptfs_new_file_context(ecryptfs_dentry); |
| 166 | if (rc) { |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 167 | ecryptfs_printk(KERN_ERR, "Error creating new file " |
| 168 | "context; rc = [%d]\n", rc); |
| 169 | goto out; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 170 | } |
Roberto Sassu | 2799289 | 2010-11-03 11:11:28 +0100 | [diff] [blame] | 171 | rc = ecryptfs_init_persistent_file(ecryptfs_dentry); |
| 172 | if (rc) { |
| 173 | printk(KERN_ERR "%s: Error attempting to initialize " |
| 174 | "the persistent file for the dentry with name " |
| 175 | "[%s]; rc = [%d]\n", __func__, |
| 176 | ecryptfs_dentry->d_name.name, rc); |
| 177 | goto out; |
Michael Halcrow | 391b52f | 2008-07-23 21:30:08 -0700 | [diff] [blame] | 178 | } |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 179 | rc = ecryptfs_write_metadata(ecryptfs_dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 180 | if (rc) { |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 181 | printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); |
| 182 | goto out; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 183 | } |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 184 | out: |
| 185 | return rc; |
| 186 | } |
| 187 | |
| 188 | /** |
| 189 | * ecryptfs_create |
| 190 | * @dir: The inode of the directory in which to create the file. |
| 191 | * @dentry: The eCryptfs dentry |
| 192 | * @mode: The mode of the new file. |
| 193 | * @nd: nameidata |
| 194 | * |
| 195 | * Creates a new file. |
| 196 | * |
| 197 | * Returns zero on success; non-zero on error condition |
| 198 | */ |
| 199 | static int |
| 200 | ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, |
| 201 | int mode, struct nameidata *nd) |
| 202 | { |
| 203 | int rc; |
| 204 | |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 205 | /* ecryptfs_do_create() calls ecryptfs_interpose() */ |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 206 | rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd); |
| 207 | if (unlikely(rc)) { |
| 208 | ecryptfs_printk(KERN_WARNING, "Failed to create file in" |
| 209 | "lower filesystem\n"); |
| 210 | goto out; |
| 211 | } |
| 212 | /* At this point, a file exists on "disk"; we need to make sure |
| 213 | * that this on disk file is prepared to be an ecryptfs file */ |
| 214 | rc = ecryptfs_initialize_file(ecryptfs_dentry); |
| 215 | out: |
| 216 | return rc; |
| 217 | } |
| 218 | |
| 219 | /** |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 220 | * ecryptfs_lookup_and_interpose_lower - Perform a lookup |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 221 | */ |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 222 | int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry, |
| 223 | struct dentry *lower_dentry, |
Tyler Hicks | 70b8902 | 2011-02-17 17:35:20 -0600 | [diff] [blame] | 224 | struct inode *ecryptfs_dir_inode) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 225 | { |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 226 | struct dentry *lower_dir_dentry; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 227 | struct vfsmount *lower_mnt; |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 228 | struct inode *lower_inode; |
Michael Halcrow | e77a56d | 2007-02-12 00:53:47 -0800 | [diff] [blame] | 229 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
Tyler Hicks | 2aac0cf | 2009-03-20 02:23:57 -0500 | [diff] [blame] | 230 | struct ecryptfs_crypt_stat *crypt_stat; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 231 | char *page_virt = NULL; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 232 | u64 file_size; |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 233 | int rc = 0; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 234 | |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 235 | lower_dir_dentry = lower_dentry->d_parent; |
| 236 | lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt( |
| 237 | ecryptfs_dentry->d_parent)); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 238 | lower_inode = lower_dentry->d_inode; |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 239 | fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode); |
Nick Piggin | b7ab39f | 2011-01-07 17:49:32 +1100 | [diff] [blame] | 240 | BUG_ON(!lower_dentry->d_count); |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 241 | ecryptfs_set_dentry_private(ecryptfs_dentry, |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 242 | kmem_cache_alloc(ecryptfs_dentry_info_cache, |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 243 | GFP_KERNEL)); |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 244 | if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) { |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 245 | rc = -ENOMEM; |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 246 | printk(KERN_ERR "%s: Out of memory whilst attempting " |
| 247 | "to allocate ecryptfs_dentry_info struct\n", |
| 248 | __func__); |
Lino Sanfilippo | 31f73be | 2010-07-29 13:01:36 +0200 | [diff] [blame] | 249 | goto out_put; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 250 | } |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 251 | ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry); |
| 252 | ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 253 | if (!lower_dentry->d_inode) { |
| 254 | /* We want to add because we couldn't find in lower */ |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 255 | d_add(ecryptfs_dentry, NULL); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 256 | goto out; |
| 257 | } |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 258 | rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, |
Erez Zadok | 3469b57 | 2009-12-06 18:51:15 -0500 | [diff] [blame] | 259 | ecryptfs_dir_inode->i_sb, |
| 260 | ECRYPTFS_INTERPOSE_FLAG_D_ADD); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 261 | if (rc) { |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 262 | printk(KERN_ERR "%s: Error interposing; rc = [%d]\n", |
| 263 | __func__, rc); |
Michael Halcrow | 391b52f | 2008-07-23 21:30:08 -0700 | [diff] [blame] | 264 | goto out; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 265 | } |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 266 | if (S_ISDIR(lower_inode->i_mode)) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 267 | goto out; |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 268 | if (S_ISLNK(lower_inode->i_mode)) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 269 | goto out; |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 270 | if (special_file(lower_inode->i_mode)) |
Ryusuke Konishi | 202a21d | 2007-08-10 13:00:51 -0700 | [diff] [blame] | 271 | goto out; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 272 | /* Released in this function */ |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 273 | page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 274 | if (!page_virt) { |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 275 | printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n", |
| 276 | __func__); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 277 | rc = -ENOMEM; |
Michael Halcrow | 391b52f | 2008-07-23 21:30:08 -0700 | [diff] [blame] | 278 | goto out; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 279 | } |
Roberto Sassu | 2799289 | 2010-11-03 11:11:28 +0100 | [diff] [blame] | 280 | rc = ecryptfs_init_persistent_file(ecryptfs_dentry); |
| 281 | if (rc) { |
| 282 | printk(KERN_ERR "%s: Error attempting to initialize " |
| 283 | "the persistent file for the dentry with name " |
| 284 | "[%s]; rc = [%d]\n", __func__, |
| 285 | ecryptfs_dentry->d_name.name, rc); |
| 286 | goto out_free_kmem; |
Michael Halcrow | 391b52f | 2008-07-23 21:30:08 -0700 | [diff] [blame] | 287 | } |
Tyler Hicks | 2aac0cf | 2009-03-20 02:23:57 -0500 | [diff] [blame] | 288 | crypt_stat = &ecryptfs_inode_to_private( |
| 289 | ecryptfs_dentry->d_inode)->crypt_stat; |
| 290 | /* TODO: lock for crypt_stat comparison */ |
| 291 | if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) |
| 292 | ecryptfs_set_default_sizes(crypt_stat); |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 293 | rc = ecryptfs_read_and_validate_header_region(page_virt, |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 294 | ecryptfs_dentry->d_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 295 | if (rc) { |
Tyler Hicks | 1984c23 | 2010-02-10 23:17:44 -0600 | [diff] [blame] | 296 | memset(page_virt, 0, PAGE_CACHE_SIZE); |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 297 | rc = ecryptfs_read_and_validate_xattr_region(page_virt, |
| 298 | ecryptfs_dentry); |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame] | 299 | if (rc) { |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame] | 300 | rc = 0; |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 301 | goto out_free_kmem; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 302 | } |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame] | 303 | crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 304 | } |
Michael Halcrow | e77a56d | 2007-02-12 00:53:47 -0800 | [diff] [blame] | 305 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 306 | ecryptfs_dentry->d_sb)->mount_crypt_stat; |
Michael Halcrow | e77a56d | 2007-02-12 00:53:47 -0800 | [diff] [blame] | 307 | if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) { |
| 308 | if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) |
Tyler Hicks | fa3ef1c | 2010-02-11 05:09:14 -0600 | [diff] [blame] | 309 | file_size = (crypt_stat->metadata_size |
Michael Halcrow | e77a56d | 2007-02-12 00:53:47 -0800 | [diff] [blame] | 310 | + i_size_read(lower_dentry->d_inode)); |
| 311 | else |
| 312 | file_size = i_size_read(lower_dentry->d_inode); |
| 313 | } else { |
Harvey Harrison | 0a688ad | 2008-07-23 21:30:07 -0700 | [diff] [blame] | 314 | file_size = get_unaligned_be64(page_virt); |
Michael Halcrow | e77a56d | 2007-02-12 00:53:47 -0800 | [diff] [blame] | 315 | } |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 316 | i_size_write(ecryptfs_dentry->d_inode, (loff_t)file_size); |
| 317 | out_free_kmem: |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 318 | kmem_cache_free(ecryptfs_header_cache_2, page_virt); |
| 319 | goto out; |
Lino Sanfilippo | 31f73be | 2010-07-29 13:01:36 +0200 | [diff] [blame] | 320 | out_put: |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 321 | dput(lower_dentry); |
Lino Sanfilippo | 31f73be | 2010-07-29 13:01:36 +0200 | [diff] [blame] | 322 | mntput(lower_mnt); |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 323 | d_drop(ecryptfs_dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 324 | out: |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 325 | return rc; |
| 326 | } |
| 327 | |
| 328 | /** |
| 329 | * ecryptfs_lookup |
| 330 | * @ecryptfs_dir_inode: The eCryptfs directory inode |
| 331 | * @ecryptfs_dentry: The eCryptfs dentry that we are looking up |
| 332 | * @ecryptfs_nd: nameidata; may be NULL |
| 333 | * |
| 334 | * Find a file on disk. If the file does not exist, then we'll add it to the |
| 335 | * dentry cache and continue on to read it from the disk. |
| 336 | */ |
| 337 | static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, |
| 338 | struct dentry *ecryptfs_dentry, |
| 339 | struct nameidata *ecryptfs_nd) |
| 340 | { |
| 341 | char *encrypted_and_encoded_name = NULL; |
Michael Halcrow | a8f1286 | 2009-01-06 14:42:03 -0800 | [diff] [blame] | 342 | size_t encrypted_and_encoded_name_size; |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 343 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 344 | struct dentry *lower_dir_dentry, *lower_dentry; |
| 345 | int rc = 0; |
| 346 | |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 347 | if ((ecryptfs_dentry->d_name.len == 1 |
| 348 | && !strcmp(ecryptfs_dentry->d_name.name, ".")) |
| 349 | || (ecryptfs_dentry->d_name.len == 2 |
| 350 | && !strcmp(ecryptfs_dentry->d_name.name, ".."))) { |
| 351 | goto out_d_drop; |
| 352 | } |
| 353 | lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); |
Tyler Hicks | 8787c7a | 2011-02-17 18:51:24 -0600 | [diff] [blame] | 354 | mutex_lock(&lower_dir_dentry->d_inode->i_mutex); |
| 355 | lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, |
| 356 | lower_dir_dentry, |
| 357 | ecryptfs_dentry->d_name.len); |
| 358 | mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 359 | if (IS_ERR(lower_dentry)) { |
| 360 | rc = PTR_ERR(lower_dentry); |
Tyler Hicks | 8787c7a | 2011-02-17 18:51:24 -0600 | [diff] [blame] | 361 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
Tyler Hicks | 9f37622 | 2010-03-25 11:16:56 -0500 | [diff] [blame] | 362 | "[%d] on lower_dentry = [%s]\n", __func__, rc, |
| 363 | encrypted_and_encoded_name); |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 364 | goto out_d_drop; |
| 365 | } |
| 366 | if (lower_dentry->d_inode) |
| 367 | goto lookup_and_interpose; |
Tyler Hicks | 2aac0cf | 2009-03-20 02:23:57 -0500 | [diff] [blame] | 368 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
| 369 | ecryptfs_dentry->d_sb)->mount_crypt_stat; |
| 370 | if (!(mount_crypt_stat |
| 371 | && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 372 | goto lookup_and_interpose; |
| 373 | dput(lower_dentry); |
| 374 | rc = ecryptfs_encrypt_and_encode_filename( |
| 375 | &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, |
Tyler Hicks | 2aac0cf | 2009-03-20 02:23:57 -0500 | [diff] [blame] | 376 | NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 377 | ecryptfs_dentry->d_name.len); |
| 378 | if (rc) { |
| 379 | printk(KERN_ERR "%s: Error attempting to encrypt and encode " |
| 380 | "filename; rc = [%d]\n", __func__, rc); |
| 381 | goto out_d_drop; |
| 382 | } |
Tyler Hicks | 8787c7a | 2011-02-17 18:51:24 -0600 | [diff] [blame] | 383 | mutex_lock(&lower_dir_dentry->d_inode->i_mutex); |
| 384 | lower_dentry = lookup_one_len(encrypted_and_encoded_name, |
| 385 | lower_dir_dentry, |
| 386 | encrypted_and_encoded_name_size); |
| 387 | mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 388 | if (IS_ERR(lower_dentry)) { |
| 389 | rc = PTR_ERR(lower_dentry); |
Tyler Hicks | 8787c7a | 2011-02-17 18:51:24 -0600 | [diff] [blame] | 390 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
Tyler Hicks | 9f37622 | 2010-03-25 11:16:56 -0500 | [diff] [blame] | 391 | "[%d] on lower_dentry = [%s]\n", __func__, rc, |
| 392 | encrypted_and_encoded_name); |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 393 | goto out_d_drop; |
| 394 | } |
| 395 | lookup_and_interpose: |
| 396 | rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry, |
Tyler Hicks | 70b8902 | 2011-02-17 17:35:20 -0600 | [diff] [blame] | 397 | ecryptfs_dir_inode); |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 398 | goto out; |
| 399 | out_d_drop: |
| 400 | d_drop(ecryptfs_dentry); |
| 401 | out: |
| 402 | kfree(encrypted_and_encoded_name); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 403 | return ERR_PTR(rc); |
| 404 | } |
| 405 | |
| 406 | static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, |
| 407 | struct dentry *new_dentry) |
| 408 | { |
| 409 | struct dentry *lower_old_dentry; |
| 410 | struct dentry *lower_new_dentry; |
| 411 | struct dentry *lower_dir_dentry; |
| 412 | u64 file_size_save; |
| 413 | int rc; |
| 414 | |
| 415 | file_size_save = i_size_read(old_dentry->d_inode); |
| 416 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); |
| 417 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); |
| 418 | dget(lower_old_dentry); |
| 419 | dget(lower_new_dentry); |
| 420 | lower_dir_dentry = lock_parent(lower_new_dentry); |
| 421 | rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, |
| 422 | lower_new_dentry); |
| 423 | if (rc || !lower_new_dentry->d_inode) |
| 424 | goto out_lock; |
| 425 | rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0); |
| 426 | if (rc) |
| 427 | goto out_lock; |
Tyler Hicks | 3a8380c | 2010-03-23 18:09:02 -0500 | [diff] [blame] | 428 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
| 429 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 430 | old_dentry->d_inode->i_nlink = |
| 431 | ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink; |
| 432 | i_size_write(new_dentry->d_inode, file_size_save); |
| 433 | out_lock: |
| 434 | unlock_dir(lower_dir_dentry); |
| 435 | dput(lower_new_dentry); |
| 436 | dput(lower_old_dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 437 | return rc; |
| 438 | } |
| 439 | |
| 440 | static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) |
| 441 | { |
| 442 | int rc = 0; |
| 443 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 444 | struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); |
Miklos Szeredi | 8dc4e37 | 2008-05-12 14:02:04 -0700 | [diff] [blame] | 445 | struct dentry *lower_dir_dentry; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 446 | |
Tyler Hicks | 9c2d205 | 2009-09-22 12:52:17 -0500 | [diff] [blame] | 447 | dget(lower_dentry); |
Miklos Szeredi | 8dc4e37 | 2008-05-12 14:02:04 -0700 | [diff] [blame] | 448 | lower_dir_dentry = lock_parent(lower_dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 449 | rc = vfs_unlink(lower_dir_inode, lower_dentry); |
| 450 | if (rc) { |
Michael Halcrow | ae56fb1 | 2006-11-16 01:19:30 -0800 | [diff] [blame] | 451 | printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 452 | goto out_unlock; |
| 453 | } |
Josef "Jeff" Sipek | 0cc72dc | 2006-12-08 02:36:31 -0800 | [diff] [blame] | 454 | fsstack_copy_attr_times(dir, lower_dir_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 455 | dentry->d_inode->i_nlink = |
| 456 | ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink; |
| 457 | dentry->d_inode->i_ctime = dir->i_ctime; |
Michael Halcrow | caeeeec | 2008-01-08 15:33:02 -0800 | [diff] [blame] | 458 | d_drop(dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 459 | out_unlock: |
Miklos Szeredi | 8dc4e37 | 2008-05-12 14:02:04 -0700 | [diff] [blame] | 460 | unlock_dir(lower_dir_dentry); |
Tyler Hicks | 9c2d205 | 2009-09-22 12:52:17 -0500 | [diff] [blame] | 461 | dput(lower_dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 462 | return rc; |
| 463 | } |
| 464 | |
| 465 | static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, |
| 466 | const char *symname) |
| 467 | { |
| 468 | int rc; |
| 469 | struct dentry *lower_dentry; |
| 470 | struct dentry *lower_dir_dentry; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 471 | char *encoded_symname; |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 472 | size_t encoded_symlen; |
| 473 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 474 | |
| 475 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 476 | dget(lower_dentry); |
| 477 | lower_dir_dentry = lock_parent(lower_dentry); |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 478 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
| 479 | dir->i_sb)->mount_crypt_stat; |
| 480 | rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, |
| 481 | &encoded_symlen, |
| 482 | NULL, |
| 483 | mount_crypt_stat, symname, |
| 484 | strlen(symname)); |
| 485 | if (rc) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 486 | goto out_lock; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 487 | rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, |
Miklos Szeredi | db2e747 | 2008-06-24 16:50:16 +0200 | [diff] [blame] | 488 | encoded_symname); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 489 | kfree(encoded_symname); |
| 490 | if (rc || !lower_dentry->d_inode) |
| 491 | goto out_lock; |
| 492 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); |
| 493 | if (rc) |
| 494 | goto out_lock; |
Josef "Jeff" Sipek | 0cc72dc | 2006-12-08 02:36:31 -0800 | [diff] [blame] | 495 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
| 496 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 497 | out_lock: |
| 498 | unlock_dir(lower_dir_dentry); |
| 499 | dput(lower_dentry); |
| 500 | if (!dentry->d_inode) |
| 501 | d_drop(dentry); |
| 502 | return rc; |
| 503 | } |
| 504 | |
| 505 | static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
| 506 | { |
| 507 | int rc; |
| 508 | struct dentry *lower_dentry; |
| 509 | struct dentry *lower_dir_dentry; |
| 510 | |
| 511 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 512 | lower_dir_dentry = lock_parent(lower_dentry); |
| 513 | rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); |
| 514 | if (rc || !lower_dentry->d_inode) |
| 515 | goto out; |
| 516 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); |
| 517 | if (rc) |
| 518 | goto out; |
Josef "Jeff" Sipek | 0cc72dc | 2006-12-08 02:36:31 -0800 | [diff] [blame] | 519 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
| 520 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 521 | dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; |
| 522 | out: |
| 523 | unlock_dir(lower_dir_dentry); |
| 524 | if (!dentry->d_inode) |
| 525 | d_drop(dentry); |
| 526 | return rc; |
| 527 | } |
| 528 | |
| 529 | static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) |
| 530 | { |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 531 | struct dentry *lower_dentry; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 532 | struct dentry *lower_dir_dentry; |
Michael Halcrow | 45ec4aba | 2006-10-30 22:07:20 -0800 | [diff] [blame] | 533 | int rc; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 534 | |
| 535 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
Michael Halcrow | 45ec4aba | 2006-10-30 22:07:20 -0800 | [diff] [blame] | 536 | dget(dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 537 | lower_dir_dentry = lock_parent(lower_dentry); |
Michael Halcrow | 45ec4aba | 2006-10-30 22:07:20 -0800 | [diff] [blame] | 538 | dget(lower_dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 539 | rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); |
Michael Halcrow | 45ec4aba | 2006-10-30 22:07:20 -0800 | [diff] [blame] | 540 | dput(lower_dentry); |
Josef "Jeff" Sipek | 0cc72dc | 2006-12-08 02:36:31 -0800 | [diff] [blame] | 541 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 542 | dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; |
| 543 | unlock_dir(lower_dir_dentry); |
| 544 | if (!rc) |
| 545 | d_drop(dentry); |
Michael Halcrow | 45ec4aba | 2006-10-30 22:07:20 -0800 | [diff] [blame] | 546 | dput(dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 547 | return rc; |
| 548 | } |
| 549 | |
| 550 | static int |
| 551 | ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) |
| 552 | { |
| 553 | int rc; |
| 554 | struct dentry *lower_dentry; |
| 555 | struct dentry *lower_dir_dentry; |
| 556 | |
| 557 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 558 | lower_dir_dentry = lock_parent(lower_dentry); |
| 559 | rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); |
| 560 | if (rc || !lower_dentry->d_inode) |
| 561 | goto out; |
Michael Halcrow | 391b52f | 2008-07-23 21:30:08 -0700 | [diff] [blame] | 562 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 563 | if (rc) |
| 564 | goto out; |
Josef "Jeff" Sipek | 0cc72dc | 2006-12-08 02:36:31 -0800 | [diff] [blame] | 565 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
| 566 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 567 | out: |
| 568 | unlock_dir(lower_dir_dentry); |
| 569 | if (!dentry->d_inode) |
| 570 | d_drop(dentry); |
| 571 | return rc; |
| 572 | } |
| 573 | |
| 574 | static int |
| 575 | ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
| 576 | struct inode *new_dir, struct dentry *new_dentry) |
| 577 | { |
| 578 | int rc; |
| 579 | struct dentry *lower_old_dentry; |
| 580 | struct dentry *lower_new_dentry; |
| 581 | struct dentry *lower_old_dir_dentry; |
| 582 | struct dentry *lower_new_dir_dentry; |
Erez Zadok | 0d132f7 | 2009-12-05 21:17:09 -0500 | [diff] [blame] | 583 | struct dentry *trap = NULL; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 584 | |
| 585 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); |
| 586 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); |
| 587 | dget(lower_old_dentry); |
| 588 | dget(lower_new_dentry); |
| 589 | lower_old_dir_dentry = dget_parent(lower_old_dentry); |
| 590 | lower_new_dir_dentry = dget_parent(lower_new_dentry); |
Erez Zadok | 0d132f7 | 2009-12-05 21:17:09 -0500 | [diff] [blame] | 591 | trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
| 592 | /* source should not be ancestor of target */ |
| 593 | if (trap == lower_old_dentry) { |
| 594 | rc = -EINVAL; |
| 595 | goto out_lock; |
| 596 | } |
| 597 | /* target should not be ancestor of source */ |
| 598 | if (trap == lower_new_dentry) { |
| 599 | rc = -ENOTEMPTY; |
| 600 | goto out_lock; |
| 601 | } |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 602 | rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, |
| 603 | lower_new_dir_dentry->d_inode, lower_new_dentry); |
| 604 | if (rc) |
| 605 | goto out_lock; |
Erez Zadok | 9afa2fb | 2009-12-02 19:51:54 -0500 | [diff] [blame] | 606 | fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 607 | if (new_dir != old_dir) |
Erez Zadok | 9afa2fb | 2009-12-02 19:51:54 -0500 | [diff] [blame] | 608 | fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 609 | out_lock: |
| 610 | unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
Tyler Hicks | dd55c89 | 2011-04-12 11:23:09 -0500 | [diff] [blame^] | 611 | dput(lower_new_dir_dentry); |
| 612 | dput(lower_old_dir_dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 613 | dput(lower_new_dentry); |
| 614 | dput(lower_old_dentry); |
| 615 | return rc; |
| 616 | } |
| 617 | |
Tyler Hicks | 3a60a16 | 2010-03-22 00:41:35 -0500 | [diff] [blame] | 618 | static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf, |
| 619 | size_t *bufsiz) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 620 | { |
Tyler Hicks | 3a60a16 | 2010-03-22 00:41:35 -0500 | [diff] [blame] | 621 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 622 | char *lower_buf; |
Tyler Hicks | 3a60a16 | 2010-03-22 00:41:35 -0500 | [diff] [blame] | 623 | size_t lower_bufsiz = PATH_MAX; |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 624 | mm_segment_t old_fs; |
| 625 | int rc; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 626 | |
Tyler Hicks | 3a6b42c | 2009-04-16 18:35:37 -0500 | [diff] [blame] | 627 | lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL); |
Tyler Hicks | 3a60a16 | 2010-03-22 00:41:35 -0500 | [diff] [blame] | 628 | if (!lower_buf) { |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 629 | rc = -ENOMEM; |
| 630 | goto out; |
| 631 | } |
| 632 | old_fs = get_fs(); |
| 633 | set_fs(get_ds()); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 634 | rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, |
| 635 | (char __user *)lower_buf, |
Tyler Hicks | 3a6b42c | 2009-04-16 18:35:37 -0500 | [diff] [blame] | 636 | lower_bufsiz); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 637 | set_fs(old_fs); |
Tyler Hicks | 3a60a16 | 2010-03-22 00:41:35 -0500 | [diff] [blame] | 638 | if (rc < 0) |
| 639 | goto out; |
| 640 | lower_bufsiz = rc; |
| 641 | rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry, |
| 642 | lower_buf, lower_bufsiz); |
| 643 | out: |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 644 | kfree(lower_buf); |
Tyler Hicks | 3a60a16 | 2010-03-22 00:41:35 -0500 | [diff] [blame] | 645 | return rc; |
| 646 | } |
| 647 | |
| 648 | static int |
| 649 | ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz) |
| 650 | { |
| 651 | char *kbuf; |
| 652 | size_t kbufsiz, copied; |
| 653 | int rc; |
| 654 | |
| 655 | rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz); |
| 656 | if (rc) |
| 657 | goto out; |
| 658 | copied = min_t(size_t, bufsiz, kbufsiz); |
| 659 | rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied; |
| 660 | kfree(kbuf); |
| 661 | fsstack_copy_attr_atime(dentry->d_inode, |
| 662 | ecryptfs_dentry_to_lower(dentry)->d_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 663 | out: |
| 664 | return rc; |
| 665 | } |
| 666 | |
| 667 | static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) |
| 668 | { |
| 669 | char *buf; |
| 670 | int len = PAGE_SIZE, rc; |
| 671 | mm_segment_t old_fs; |
| 672 | |
| 673 | /* Released in ecryptfs_put_link(); only release here on error */ |
| 674 | buf = kmalloc(len, GFP_KERNEL); |
| 675 | if (!buf) { |
OGAWA Hirofumi | 806892e | 2010-01-12 03:36:14 +0900 | [diff] [blame] | 676 | buf = ERR_PTR(-ENOMEM); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 677 | goto out; |
| 678 | } |
| 679 | old_fs = get_fs(); |
| 680 | set_fs(get_ds()); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 681 | rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 682 | set_fs(old_fs); |
OGAWA Hirofumi | 806892e | 2010-01-12 03:36:14 +0900 | [diff] [blame] | 683 | if (rc < 0) { |
| 684 | kfree(buf); |
| 685 | buf = ERR_PTR(rc); |
| 686 | } else |
Duane Griffin | a17d523 | 2008-12-19 20:47:10 +0000 | [diff] [blame] | 687 | buf[rc] = '\0'; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 688 | out: |
OGAWA Hirofumi | 806892e | 2010-01-12 03:36:14 +0900 | [diff] [blame] | 689 | nd_set_link(nd, buf); |
| 690 | return NULL; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 691 | } |
| 692 | |
| 693 | static void |
| 694 | ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) |
| 695 | { |
OGAWA Hirofumi | 806892e | 2010-01-12 03:36:14 +0900 | [diff] [blame] | 696 | char *buf = nd_get_link(nd); |
| 697 | if (!IS_ERR(buf)) { |
| 698 | /* Free the char* */ |
| 699 | kfree(buf); |
| 700 | } |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 701 | } |
| 702 | |
| 703 | /** |
| 704 | * upper_size_to_lower_size |
| 705 | * @crypt_stat: Crypt_stat associated with file |
| 706 | * @upper_size: Size of the upper file |
| 707 | * |
Michael Halcrow | cc11bef | 2008-02-06 01:38:32 -0800 | [diff] [blame] | 708 | * Calculate the required size of the lower file based on the |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 709 | * specified size of the upper file. This calculation is based on the |
| 710 | * number of headers in the underlying file and the extent size. |
| 711 | * |
| 712 | * Returns Calculated size of the lower file. |
| 713 | */ |
| 714 | static loff_t |
| 715 | upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, |
| 716 | loff_t upper_size) |
| 717 | { |
| 718 | loff_t lower_size; |
| 719 | |
Tyler Hicks | 157f107 | 2010-02-11 07:10:38 -0600 | [diff] [blame] | 720 | lower_size = ecryptfs_lower_header_size(crypt_stat); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 721 | if (upper_size != 0) { |
| 722 | loff_t num_extents; |
| 723 | |
| 724 | num_extents = upper_size >> crypt_stat->extent_shift; |
| 725 | if (upper_size & ~crypt_stat->extent_mask) |
| 726 | num_extents++; |
| 727 | lower_size += (num_extents * crypt_stat->extent_size); |
| 728 | } |
| 729 | return lower_size; |
| 730 | } |
| 731 | |
| 732 | /** |
Tyler Hicks | 5f3ef64f | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 733 | * truncate_upper |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 734 | * @dentry: The ecryptfs layer dentry |
Tyler Hicks | 5f3ef64f | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 735 | * @ia: Address of the ecryptfs inode's attributes |
| 736 | * @lower_ia: Address of the lower inode's attributes |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 737 | * |
| 738 | * Function to handle truncations modifying the size of the file. Note |
| 739 | * that the file sizes are interpolated. When expanding, we are simply |
Tyler Hicks | 5f3ef64f | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 740 | * writing strings of 0's out. When truncating, we truncate the upper |
| 741 | * inode and update the lower_ia according to the page index |
| 742 | * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, |
| 743 | * the caller must use lower_ia in a call to notify_change() to perform |
| 744 | * the truncation of the lower inode. |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 745 | * |
| 746 | * Returns zero on success; non-zero otherwise |
| 747 | */ |
Tyler Hicks | 5f3ef64f | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 748 | static int truncate_upper(struct dentry *dentry, struct iattr *ia, |
| 749 | struct iattr *lower_ia) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 750 | { |
| 751 | int rc = 0; |
| 752 | struct inode *inode = dentry->d_inode; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 753 | struct ecryptfs_crypt_stat *crypt_stat; |
| 754 | loff_t i_size = i_size_read(inode); |
| 755 | loff_t lower_size_before_truncate; |
| 756 | loff_t lower_size_after_truncate; |
| 757 | |
Tyler Hicks | 5f3ef64f | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 758 | if (unlikely((ia->ia_size == i_size))) { |
| 759 | lower_ia->ia_valid &= ~ATTR_SIZE; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 760 | goto out; |
Tyler Hicks | 5f3ef64f | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 761 | } |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 762 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 763 | /* Switch on growing or shrinking file */ |
Tyler Hicks | 5f3ef64f | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 764 | if (ia->ia_size > i_size) { |
Michael Halcrow | 2ed9255 | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 765 | char zero[] = { 0x00 }; |
Michael Halcrow | 240e2df | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 766 | |
Tyler Hicks | 5f3ef64f | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 767 | lower_ia->ia_valid &= ~ATTR_SIZE; |
Michael Halcrow | 2ed9255 | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 768 | /* Write a single 0 at the last position of the file; |
| 769 | * this triggers code that will fill in 0's throughout |
| 770 | * the intermediate portion of the previous end of the |
| 771 | * file and the new and of the file */ |
Al Viro | 48c1e44 | 2010-05-21 11:09:58 -0400 | [diff] [blame] | 772 | rc = ecryptfs_write(inode, zero, |
Tyler Hicks | 5f3ef64f | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 773 | (ia->ia_size - 1), 1); |
| 774 | } else { /* ia->ia_size < i_size_read(inode) */ |
| 775 | /* We're chopping off all the pages down to the page |
| 776 | * in which ia->ia_size is located. Fill in the end of |
| 777 | * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to |
Michael Halcrow | 2ed9255 | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 778 | * PAGE_CACHE_SIZE with zeros. */ |
| 779 | size_t num_zeros = (PAGE_CACHE_SIZE |
Tyler Hicks | 5f3ef64f | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 780 | - (ia->ia_size & ~PAGE_CACHE_MASK)); |
Michael Halcrow | 2ed9255 | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 781 | |
Christoph Hellwig | 2c27c65 | 2010-06-04 11:30:04 +0200 | [diff] [blame] | 782 | |
| 783 | /* |
| 784 | * XXX(truncate) this should really happen at the begginning |
| 785 | * of ->setattr. But the code is too messy to that as part |
| 786 | * of a larger patch. ecryptfs is also totally missing out |
| 787 | * on the inode_change_ok check at the beginning of |
| 788 | * ->setattr while would include this. |
| 789 | */ |
| 790 | rc = inode_newsize_ok(inode, ia->ia_size); |
| 791 | if (rc) |
| 792 | goto out; |
| 793 | |
Tyler Hicks | 13a791b | 2009-04-13 15:29:27 -0500 | [diff] [blame] | 794 | if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { |
Christoph Hellwig | 2c27c65 | 2010-06-04 11:30:04 +0200 | [diff] [blame] | 795 | truncate_setsize(inode, ia->ia_size); |
Tyler Hicks | 5f3ef64f | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 796 | lower_ia->ia_size = ia->ia_size; |
| 797 | lower_ia->ia_valid |= ATTR_SIZE; |
Al Viro | 48c1e44 | 2010-05-21 11:09:58 -0400 | [diff] [blame] | 798 | goto out; |
Tyler Hicks | 13a791b | 2009-04-13 15:29:27 -0500 | [diff] [blame] | 799 | } |
Michael Halcrow | 2ed9255 | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 800 | if (num_zeros) { |
| 801 | char *zeros_virt; |
| 802 | |
| 803 | zeros_virt = kzalloc(num_zeros, GFP_KERNEL); |
| 804 | if (!zeros_virt) { |
| 805 | rc = -ENOMEM; |
Al Viro | 48c1e44 | 2010-05-21 11:09:58 -0400 | [diff] [blame] | 806 | goto out; |
Michael Halcrow | 2ed9255 | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 807 | } |
Al Viro | 48c1e44 | 2010-05-21 11:09:58 -0400 | [diff] [blame] | 808 | rc = ecryptfs_write(inode, zeros_virt, |
Tyler Hicks | 5f3ef64f | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 809 | ia->ia_size, num_zeros); |
Michael Halcrow | 2ed9255 | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 810 | kfree(zeros_virt); |
Michael Halcrow | 5dda699 | 2007-10-16 01:28:06 -0700 | [diff] [blame] | 811 | if (rc) { |
Michael Halcrow | 240e2df | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 812 | printk(KERN_ERR "Error attempting to zero out " |
| 813 | "the remainder of the end page on " |
| 814 | "reducing truncate; rc = [%d]\n", rc); |
Al Viro | 48c1e44 | 2010-05-21 11:09:58 -0400 | [diff] [blame] | 815 | goto out; |
Michael Halcrow | 240e2df | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 816 | } |
| 817 | } |
Christoph Hellwig | 2c27c65 | 2010-06-04 11:30:04 +0200 | [diff] [blame] | 818 | truncate_setsize(inode, ia->ia_size); |
Michael Halcrow | 0216f7f | 2007-10-16 01:28:08 -0700 | [diff] [blame] | 819 | rc = ecryptfs_write_inode_size_to_metadata(inode); |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame] | 820 | if (rc) { |
| 821 | printk(KERN_ERR "Problem with " |
| 822 | "ecryptfs_write_inode_size_to_metadata; " |
| 823 | "rc = [%d]\n", rc); |
Al Viro | 48c1e44 | 2010-05-21 11:09:58 -0400 | [diff] [blame] | 824 | goto out; |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame] | 825 | } |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 826 | /* We are reducing the size of the ecryptfs file, and need to |
| 827 | * know if we need to reduce the size of the lower file. */ |
| 828 | lower_size_before_truncate = |
| 829 | upper_size_to_lower_size(crypt_stat, i_size); |
| 830 | lower_size_after_truncate = |
Tyler Hicks | 5f3ef64f | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 831 | upper_size_to_lower_size(crypt_stat, ia->ia_size); |
| 832 | if (lower_size_after_truncate < lower_size_before_truncate) { |
| 833 | lower_ia->ia_size = lower_size_after_truncate; |
| 834 | lower_ia->ia_valid |= ATTR_SIZE; |
| 835 | } else |
| 836 | lower_ia->ia_valid &= ~ATTR_SIZE; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 837 | } |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 838 | out: |
| 839 | return rc; |
| 840 | } |
| 841 | |
Tyler Hicks | 5f3ef64f | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 842 | /** |
| 843 | * ecryptfs_truncate |
| 844 | * @dentry: The ecryptfs layer dentry |
| 845 | * @new_length: The length to expand the file to |
| 846 | * |
| 847 | * Simple function that handles the truncation of an eCryptfs inode and |
| 848 | * its corresponding lower inode. |
| 849 | * |
| 850 | * Returns zero on success; non-zero otherwise |
| 851 | */ |
| 852 | int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) |
| 853 | { |
| 854 | struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; |
| 855 | struct iattr lower_ia = { .ia_valid = 0 }; |
| 856 | int rc; |
| 857 | |
| 858 | rc = truncate_upper(dentry, &ia, &lower_ia); |
| 859 | if (!rc && lower_ia.ia_valid & ATTR_SIZE) { |
| 860 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 861 | |
| 862 | mutex_lock(&lower_dentry->d_inode->i_mutex); |
| 863 | rc = notify_change(lower_dentry, &lower_ia); |
| 864 | mutex_unlock(&lower_dentry->d_inode->i_mutex); |
| 865 | } |
| 866 | return rc; |
| 867 | } |
| 868 | |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 869 | static int |
Nick Piggin | b74c79e | 2011-01-07 17:49:58 +1100 | [diff] [blame] | 870 | ecryptfs_permission(struct inode *inode, int mask, unsigned int flags) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 871 | { |
Nick Piggin | b74c79e | 2011-01-07 17:49:58 +1100 | [diff] [blame] | 872 | if (flags & IPERM_FLAG_RCU) |
| 873 | return -ECHILD; |
Al Viro | f419a2e | 2008-07-22 00:07:17 -0400 | [diff] [blame] | 874 | return inode_permission(ecryptfs_inode_to_lower(inode), mask); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 875 | } |
| 876 | |
| 877 | /** |
| 878 | * ecryptfs_setattr |
| 879 | * @dentry: dentry handle to the inode to modify |
| 880 | * @ia: Structure with flags of what to change and values |
| 881 | * |
| 882 | * Updates the metadata of an inode. If the update is to the size |
| 883 | * i.e. truncation, then ecryptfs_truncate will handle the size modification |
| 884 | * of both the ecryptfs inode and the lower inode. |
| 885 | * |
| 886 | * All other metadata changes will be passed right to the lower filesystem, |
| 887 | * and we will just update our inode to look like the lower. |
| 888 | */ |
| 889 | static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) |
| 890 | { |
| 891 | int rc = 0; |
| 892 | struct dentry *lower_dentry; |
Tyler Hicks | 5f3ef64f | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 893 | struct iattr lower_ia; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 894 | struct inode *inode; |
| 895 | struct inode *lower_inode; |
| 896 | struct ecryptfs_crypt_stat *crypt_stat; |
| 897 | |
| 898 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 899 | if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) |
| 900 | ecryptfs_init_crypt_stat(crypt_stat); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 901 | inode = dentry->d_inode; |
| 902 | lower_inode = ecryptfs_inode_to_lower(inode); |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 903 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 904 | mutex_lock(&crypt_stat->cs_mutex); |
| 905 | if (S_ISDIR(dentry->d_inode->i_mode)) |
| 906 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
Michael Halcrow | 64ee480 | 2007-07-19 01:47:54 -0700 | [diff] [blame] | 907 | else if (S_ISREG(dentry->d_inode->i_mode) |
| 908 | && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) |
| 909 | || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 910 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 911 | |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 912 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
| 913 | dentry->d_sb)->mount_crypt_stat; |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 914 | rc = ecryptfs_read_metadata(dentry); |
Michael Halcrow | 5dda699 | 2007-10-16 01:28:06 -0700 | [diff] [blame] | 915 | if (rc) { |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 916 | if (!(mount_crypt_stat->flags |
| 917 | & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { |
| 918 | rc = -EIO; |
Michael Halcrow | 25bd817 | 2008-02-06 01:38:35 -0800 | [diff] [blame] | 919 | printk(KERN_WARNING "Either the lower file " |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 920 | "is not in a valid eCryptfs format, " |
Michael Halcrow | 25bd817 | 2008-02-06 01:38:35 -0800 | [diff] [blame] | 921 | "or the key could not be retrieved. " |
| 922 | "Plaintext passthrough mode is not " |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 923 | "enabled; returning -EIO\n"); |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 924 | mutex_unlock(&crypt_stat->cs_mutex); |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 925 | goto out; |
| 926 | } |
| 927 | rc = 0; |
| 928 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 929 | } |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 930 | } |
| 931 | mutex_unlock(&crypt_stat->cs_mutex); |
Tyler Hicks | 5f3ef64f | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 932 | memcpy(&lower_ia, ia, sizeof(lower_ia)); |
| 933 | if (ia->ia_valid & ATTR_FILE) |
| 934 | lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 935 | if (ia->ia_valid & ATTR_SIZE) { |
Tyler Hicks | 5f3ef64f | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 936 | rc = truncate_upper(dentry, ia, &lower_ia); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 937 | if (rc < 0) |
| 938 | goto out; |
| 939 | } |
Jeff Layton | 1ac564e | 2007-10-18 03:05:17 -0700 | [diff] [blame] | 940 | |
| 941 | /* |
| 942 | * mode change is for clearing setuid/setgid bits. Allow lower fs |
| 943 | * to interpret this in its own way. |
| 944 | */ |
Tyler Hicks | 5f3ef64f | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 945 | if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) |
| 946 | lower_ia.ia_valid &= ~ATTR_MODE; |
Jeff Layton | 1ac564e | 2007-10-18 03:05:17 -0700 | [diff] [blame] | 947 | |
Miklos Szeredi | 9c3580a | 2008-04-29 00:59:48 -0700 | [diff] [blame] | 948 | mutex_lock(&lower_dentry->d_inode->i_mutex); |
Tyler Hicks | 5f3ef64f | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 949 | rc = notify_change(lower_dentry, &lower_ia); |
Miklos Szeredi | 9c3580a | 2008-04-29 00:59:48 -0700 | [diff] [blame] | 950 | mutex_unlock(&lower_dentry->d_inode->i_mutex); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 951 | out: |
Erez Zadok | 9afa2fb | 2009-12-02 19:51:54 -0500 | [diff] [blame] | 952 | fsstack_copy_attr_all(inode, lower_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 953 | return rc; |
| 954 | } |
| 955 | |
Tyler Hicks | 3a60a16 | 2010-03-22 00:41:35 -0500 | [diff] [blame] | 956 | int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, |
| 957 | struct kstat *stat) |
| 958 | { |
| 959 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
| 960 | int rc = 0; |
| 961 | |
| 962 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
| 963 | dentry->d_sb)->mount_crypt_stat; |
| 964 | generic_fillattr(dentry->d_inode, stat); |
| 965 | if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { |
| 966 | char *target; |
| 967 | size_t targetsiz; |
| 968 | |
| 969 | rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz); |
| 970 | if (!rc) { |
| 971 | kfree(target); |
| 972 | stat->size = targetsiz; |
| 973 | } |
| 974 | } |
| 975 | return rc; |
| 976 | } |
| 977 | |
Tyler Hicks | f8f484d | 2009-11-04 02:48:01 -0600 | [diff] [blame] | 978 | int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, |
| 979 | struct kstat *stat) |
| 980 | { |
| 981 | struct kstat lower_stat; |
| 982 | int rc; |
| 983 | |
| 984 | rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry), |
| 985 | ecryptfs_dentry_to_lower(dentry), &lower_stat); |
| 986 | if (!rc) { |
Tyler Hicks | 55f9cf6 | 2011-01-11 12:43:42 -0600 | [diff] [blame] | 987 | fsstack_copy_attr_all(dentry->d_inode, |
| 988 | ecryptfs_inode_to_lower(dentry->d_inode)); |
Tyler Hicks | f8f484d | 2009-11-04 02:48:01 -0600 | [diff] [blame] | 989 | generic_fillattr(dentry->d_inode, stat); |
| 990 | stat->blocks = lower_stat.blocks; |
| 991 | } |
| 992 | return rc; |
| 993 | } |
| 994 | |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame] | 995 | int |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 996 | ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
| 997 | size_t size, int flags) |
| 998 | { |
| 999 | int rc = 0; |
| 1000 | struct dentry *lower_dentry; |
| 1001 | |
| 1002 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 1003 | if (!lower_dentry->d_inode->i_op->setxattr) { |
Christian Pulvermacher | cfce08c | 2010-03-23 11:51:38 -0500 | [diff] [blame] | 1004 | rc = -EOPNOTSUPP; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1005 | goto out; |
| 1006 | } |
Roberto Sassu | 48b512e | 2010-10-05 18:53:45 +0200 | [diff] [blame] | 1007 | |
| 1008 | rc = vfs_setxattr(lower_dentry, name, value, size, flags); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1009 | out: |
| 1010 | return rc; |
| 1011 | } |
| 1012 | |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame] | 1013 | ssize_t |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 1014 | ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, |
| 1015 | void *value, size_t size) |
| 1016 | { |
| 1017 | int rc = 0; |
| 1018 | |
| 1019 | if (!lower_dentry->d_inode->i_op->getxattr) { |
Christian Pulvermacher | cfce08c | 2010-03-23 11:51:38 -0500 | [diff] [blame] | 1020 | rc = -EOPNOTSUPP; |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 1021 | goto out; |
| 1022 | } |
| 1023 | mutex_lock(&lower_dentry->d_inode->i_mutex); |
| 1024 | rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, |
| 1025 | size); |
| 1026 | mutex_unlock(&lower_dentry->d_inode->i_mutex); |
| 1027 | out: |
| 1028 | return rc; |
| 1029 | } |
| 1030 | |
Adrian Bunk | 7896b63 | 2008-02-06 01:38:32 -0800 | [diff] [blame] | 1031 | static ssize_t |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1032 | ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, |
| 1033 | size_t size) |
| 1034 | { |
Michael Halcrow | 2ed9255 | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 1035 | return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, |
| 1036 | value, size); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1037 | } |
| 1038 | |
| 1039 | static ssize_t |
| 1040 | ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) |
| 1041 | { |
| 1042 | int rc = 0; |
| 1043 | struct dentry *lower_dentry; |
| 1044 | |
| 1045 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 1046 | if (!lower_dentry->d_inode->i_op->listxattr) { |
Christian Pulvermacher | cfce08c | 2010-03-23 11:51:38 -0500 | [diff] [blame] | 1047 | rc = -EOPNOTSUPP; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1048 | goto out; |
| 1049 | } |
| 1050 | mutex_lock(&lower_dentry->d_inode->i_mutex); |
| 1051 | rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); |
| 1052 | mutex_unlock(&lower_dentry->d_inode->i_mutex); |
| 1053 | out: |
| 1054 | return rc; |
| 1055 | } |
| 1056 | |
| 1057 | static int ecryptfs_removexattr(struct dentry *dentry, const char *name) |
| 1058 | { |
| 1059 | int rc = 0; |
| 1060 | struct dentry *lower_dentry; |
| 1061 | |
| 1062 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 1063 | if (!lower_dentry->d_inode->i_op->removexattr) { |
Christian Pulvermacher | cfce08c | 2010-03-23 11:51:38 -0500 | [diff] [blame] | 1064 | rc = -EOPNOTSUPP; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1065 | goto out; |
| 1066 | } |
| 1067 | mutex_lock(&lower_dentry->d_inode->i_mutex); |
| 1068 | rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); |
| 1069 | mutex_unlock(&lower_dentry->d_inode->i_mutex); |
| 1070 | out: |
| 1071 | return rc; |
| 1072 | } |
| 1073 | |
| 1074 | int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode) |
| 1075 | { |
| 1076 | if ((ecryptfs_inode_to_lower(inode) |
| 1077 | == (struct inode *)candidate_lower_inode)) |
| 1078 | return 1; |
| 1079 | else |
| 1080 | return 0; |
| 1081 | } |
| 1082 | |
| 1083 | int ecryptfs_inode_set(struct inode *inode, void *lower_inode) |
| 1084 | { |
| 1085 | ecryptfs_init_inode(inode, (struct inode *)lower_inode); |
| 1086 | return 0; |
| 1087 | } |
| 1088 | |
Arjan van de Ven | 754661f | 2007-02-12 00:55:38 -0800 | [diff] [blame] | 1089 | const struct inode_operations ecryptfs_symlink_iops = { |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1090 | .readlink = ecryptfs_readlink, |
| 1091 | .follow_link = ecryptfs_follow_link, |
| 1092 | .put_link = ecryptfs_put_link, |
| 1093 | .permission = ecryptfs_permission, |
| 1094 | .setattr = ecryptfs_setattr, |
Tyler Hicks | 3a60a16 | 2010-03-22 00:41:35 -0500 | [diff] [blame] | 1095 | .getattr = ecryptfs_getattr_link, |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1096 | .setxattr = ecryptfs_setxattr, |
| 1097 | .getxattr = ecryptfs_getxattr, |
| 1098 | .listxattr = ecryptfs_listxattr, |
| 1099 | .removexattr = ecryptfs_removexattr |
| 1100 | }; |
| 1101 | |
Arjan van de Ven | 754661f | 2007-02-12 00:55:38 -0800 | [diff] [blame] | 1102 | const struct inode_operations ecryptfs_dir_iops = { |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1103 | .create = ecryptfs_create, |
| 1104 | .lookup = ecryptfs_lookup, |
| 1105 | .link = ecryptfs_link, |
| 1106 | .unlink = ecryptfs_unlink, |
| 1107 | .symlink = ecryptfs_symlink, |
| 1108 | .mkdir = ecryptfs_mkdir, |
| 1109 | .rmdir = ecryptfs_rmdir, |
| 1110 | .mknod = ecryptfs_mknod, |
| 1111 | .rename = ecryptfs_rename, |
| 1112 | .permission = ecryptfs_permission, |
| 1113 | .setattr = ecryptfs_setattr, |
| 1114 | .setxattr = ecryptfs_setxattr, |
| 1115 | .getxattr = ecryptfs_getxattr, |
| 1116 | .listxattr = ecryptfs_listxattr, |
| 1117 | .removexattr = ecryptfs_removexattr |
| 1118 | }; |
| 1119 | |
Arjan van de Ven | 754661f | 2007-02-12 00:55:38 -0800 | [diff] [blame] | 1120 | const struct inode_operations ecryptfs_main_iops = { |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1121 | .permission = ecryptfs_permission, |
| 1122 | .setattr = ecryptfs_setattr, |
Tyler Hicks | f8f484d | 2009-11-04 02:48:01 -0600 | [diff] [blame] | 1123 | .getattr = ecryptfs_getattr, |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1124 | .setxattr = ecryptfs_setxattr, |
| 1125 | .getxattr = ecryptfs_getxattr, |
| 1126 | .listxattr = ecryptfs_listxattr, |
| 1127 | .removexattr = ecryptfs_removexattr |
| 1128 | }; |