11a59d1b8SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 2237fead6SMichael Halcrow /** 3237fead6SMichael Halcrow * eCryptfs: Linux filesystem encryption layer 4237fead6SMichael Halcrow * 5237fead6SMichael Halcrow * Copyright (C) 1997-2004 Erez Zadok 6237fead6SMichael Halcrow * Copyright (C) 2001-2004 Stony Brook University 7dd2a3b7aSMichael Halcrow * Copyright (C) 2004-2007 International Business Machines Corp. 8237fead6SMichael Halcrow * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com> 9237fead6SMichael Halcrow * Michael C. Thompsion <mcthomps@us.ibm.com> 10237fead6SMichael Halcrow */ 11237fead6SMichael Halcrow 12237fead6SMichael Halcrow #include <linux/file.h> 13237fead6SMichael Halcrow #include <linux/vmalloc.h> 14237fead6SMichael Halcrow #include <linux/pagemap.h> 15237fead6SMichael Halcrow #include <linux/dcache.h> 16237fead6SMichael Halcrow #include <linux/namei.h> 17237fead6SMichael Halcrow #include <linux/mount.h> 180cc72dc7SJosef "Jeff" Sipek #include <linux/fs_stack.h> 195a0e3ad6STejun Heo #include <linux/slab.h> 2048b512e6SRoberto Sassu #include <linux/xattr.h> 210a688ad7SHarvey Harrison #include <asm/unaligned.h> 22237fead6SMichael Halcrow #include "ecryptfs_kernel.h" 23237fead6SMichael Halcrow 24*b2648d51SAl Viro static int lock_parent(struct dentry *dentry, 25*b2648d51SAl Viro struct dentry **lower_dentry, 26*b2648d51SAl Viro struct inode **lower_dir) 27237fead6SMichael Halcrow { 28*b2648d51SAl Viro struct dentry *lower_dir_dentry; 29237fead6SMichael Halcrow 30*b2648d51SAl Viro lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent); 31*b2648d51SAl Viro *lower_dir = d_inode(lower_dir_dentry); 32*b2648d51SAl Viro *lower_dentry = ecryptfs_dentry_to_lower(dentry); 33237fead6SMichael Halcrow 34*b2648d51SAl Viro inode_lock_nested(*lower_dir, I_MUTEX_PARENT); 35*b2648d51SAl Viro return (*lower_dentry)->d_parent == lower_dir_dentry ? 0 : -EINVAL; 36237fead6SMichael Halcrow } 37237fead6SMichael Halcrow 38c4f79073STyler Hicks static int ecryptfs_inode_test(struct inode *inode, void *lower_inode) 39c4f79073STyler Hicks { 40c4cf3ba4SHimangi Saraogi return ecryptfs_inode_to_lower(inode) == lower_inode; 41c4f79073STyler Hicks } 42c4f79073STyler Hicks 435ccf9203STyler Hicks static int ecryptfs_inode_set(struct inode *inode, void *opaque) 44c4f79073STyler Hicks { 455ccf9203STyler Hicks struct inode *lower_inode = opaque; 465ccf9203STyler Hicks 475ccf9203STyler Hicks ecryptfs_set_inode_lower(inode, lower_inode); 485ccf9203STyler Hicks fsstack_copy_attr_all(inode, lower_inode); 495ccf9203STyler Hicks /* i_size will be overwritten for encrypted regular files */ 505ccf9203STyler Hicks fsstack_copy_inode_size(inode, lower_inode); 515ccf9203STyler Hicks inode->i_ino = lower_inode->i_ino; 52c4f79073STyler Hicks inode->i_mapping->a_ops = &ecryptfs_aops; 535ccf9203STyler Hicks 545ccf9203STyler Hicks if (S_ISLNK(inode->i_mode)) 555ccf9203STyler Hicks inode->i_op = &ecryptfs_symlink_iops; 565ccf9203STyler Hicks else if (S_ISDIR(inode->i_mode)) 575ccf9203STyler Hicks inode->i_op = &ecryptfs_dir_iops; 585ccf9203STyler Hicks else 595ccf9203STyler Hicks inode->i_op = &ecryptfs_main_iops; 605ccf9203STyler Hicks 615ccf9203STyler Hicks if (S_ISDIR(inode->i_mode)) 625ccf9203STyler Hicks inode->i_fop = &ecryptfs_dir_fops; 635ccf9203STyler Hicks else if (special_file(inode->i_mode)) 645ccf9203STyler Hicks init_special_inode(inode, inode->i_mode, inode->i_rdev); 655ccf9203STyler Hicks else 665ccf9203STyler Hicks inode->i_fop = &ecryptfs_main_fops; 675ccf9203STyler Hicks 68c4f79073STyler Hicks return 0; 69c4f79073STyler Hicks } 70c4f79073STyler Hicks 715ccf9203STyler Hicks static struct inode *__ecryptfs_get_inode(struct inode *lower_inode, 725ccf9203STyler Hicks struct super_block *sb) 735ccf9203STyler Hicks { 745ccf9203STyler Hicks struct inode *inode; 755ccf9203STyler Hicks 765ccf9203STyler Hicks if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) 775ccf9203STyler Hicks return ERR_PTR(-EXDEV); 785ccf9203STyler Hicks if (!igrab(lower_inode)) 795ccf9203STyler Hicks return ERR_PTR(-ESTALE); 805ccf9203STyler Hicks inode = iget5_locked(sb, (unsigned long)lower_inode, 815ccf9203STyler Hicks ecryptfs_inode_test, ecryptfs_inode_set, 825ccf9203STyler Hicks lower_inode); 835ccf9203STyler Hicks if (!inode) { 845ccf9203STyler Hicks iput(lower_inode); 855ccf9203STyler Hicks return ERR_PTR(-EACCES); 865ccf9203STyler Hicks } 875ccf9203STyler Hicks if (!(inode->i_state & I_NEW)) 885ccf9203STyler Hicks iput(lower_inode); 895ccf9203STyler Hicks 905ccf9203STyler Hicks return inode; 915ccf9203STyler Hicks } 925ccf9203STyler Hicks 93c4f79073STyler Hicks struct inode *ecryptfs_get_inode(struct inode *lower_inode, 94c4f79073STyler Hicks struct super_block *sb) 95c4f79073STyler Hicks { 965ccf9203STyler Hicks struct inode *inode = __ecryptfs_get_inode(lower_inode, sb); 97c4f79073STyler Hicks 985ccf9203STyler Hicks if (!IS_ERR(inode) && (inode->i_state & I_NEW)) 99c4f79073STyler Hicks unlock_new_inode(inode); 1005ccf9203STyler Hicks 101c4f79073STyler Hicks return inode; 102c4f79073STyler Hicks } 103c4f79073STyler Hicks 104c4f79073STyler Hicks /** 105c4f79073STyler Hicks * ecryptfs_interpose 106c4f79073STyler Hicks * @lower_dentry: Existing dentry in the lower filesystem 107c4f79073STyler Hicks * @dentry: ecryptfs' dentry 108c4f79073STyler Hicks * @sb: ecryptfs's super_block 109c4f79073STyler Hicks * 110c4f79073STyler Hicks * Interposes upper and lower dentries. 111c4f79073STyler Hicks * 112c4f79073STyler Hicks * Returns zero on success; non-zero otherwise 113c4f79073STyler Hicks */ 114c4f79073STyler Hicks static int ecryptfs_interpose(struct dentry *lower_dentry, 1155ccf9203STyler Hicks struct dentry *dentry, struct super_block *sb) 116c4f79073STyler Hicks { 1172b0143b5SDavid Howells struct inode *inode = ecryptfs_get_inode(d_inode(lower_dentry), sb); 1185ccf9203STyler Hicks 119c4f79073STyler Hicks if (IS_ERR(inode)) 120c4f79073STyler Hicks return PTR_ERR(inode); 121c4f79073STyler Hicks d_instantiate(dentry, inode); 1225ccf9203STyler Hicks 123c4f79073STyler Hicks return 0; 124c4f79073STyler Hicks } 125c4f79073STyler Hicks 1268bc2d3cfSTyler Hicks static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry, 1278bc2d3cfSTyler Hicks struct inode *inode) 1288bc2d3cfSTyler Hicks { 129*b2648d51SAl Viro struct dentry *lower_dentry; 130*b2648d51SAl Viro struct inode *lower_dir; 1318bc2d3cfSTyler Hicks int rc; 1328bc2d3cfSTyler Hicks 133*b2648d51SAl Viro rc = lock_parent(dentry, &lower_dentry, &lower_dir); 134bcf0d9d4SAl Viro dget(lower_dentry); // don't even try to make the lower negative 135*b2648d51SAl Viro if (!rc) { 136*b2648d51SAl Viro if (d_unhashed(lower_dentry)) 137bcf0d9d4SAl Viro rc = -EINVAL; 138bcf0d9d4SAl Viro else 139*b2648d51SAl Viro rc = vfs_unlink(&init_user_ns, lower_dir, lower_dentry, 1406521f891SChristian Brauner NULL); 141*b2648d51SAl Viro } 1428bc2d3cfSTyler Hicks if (rc) { 1438bc2d3cfSTyler Hicks printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); 1448bc2d3cfSTyler Hicks goto out_unlock; 1458bc2d3cfSTyler Hicks } 146*b2648d51SAl Viro fsstack_copy_attr_times(dir, lower_dir); 1478bc2d3cfSTyler Hicks set_nlink(inode, ecryptfs_inode_to_lower(inode)->i_nlink); 1488bc2d3cfSTyler Hicks inode->i_ctime = dir->i_ctime; 1498bc2d3cfSTyler Hicks out_unlock: 1508bc2d3cfSTyler Hicks dput(lower_dentry); 151*b2648d51SAl Viro inode_unlock(lower_dir); 152bcf0d9d4SAl Viro if (!rc) 153bcf0d9d4SAl Viro d_drop(dentry); 1548bc2d3cfSTyler Hicks return rc; 1558bc2d3cfSTyler Hicks } 1568bc2d3cfSTyler Hicks 157237fead6SMichael Halcrow /** 158237fead6SMichael Halcrow * ecryptfs_do_create 159237fead6SMichael Halcrow * @directory_inode: inode of the new file's dentry's parent in ecryptfs 160237fead6SMichael Halcrow * @ecryptfs_dentry: New file's dentry in ecryptfs 161237fead6SMichael Halcrow * @mode: The mode of the new file 162237fead6SMichael Halcrow * 163237fead6SMichael Halcrow * Creates the underlying file and the eCryptfs inode which will link to 164237fead6SMichael Halcrow * it. It will also update the eCryptfs directory inode to mimic the 165237fead6SMichael Halcrow * stat of the lower directory inode. 166237fead6SMichael Halcrow * 167b59db43aSTyler Hicks * Returns the new eCryptfs inode on success; an ERR_PTR on error condition 168237fead6SMichael Halcrow */ 169b59db43aSTyler Hicks static struct inode * 170237fead6SMichael Halcrow ecryptfs_do_create(struct inode *directory_inode, 171175a4eb7SAl Viro struct dentry *ecryptfs_dentry, umode_t mode) 172237fead6SMichael Halcrow { 173237fead6SMichael Halcrow int rc; 174237fead6SMichael Halcrow struct dentry *lower_dentry; 175*b2648d51SAl Viro struct inode *lower_dir; 176b59db43aSTyler Hicks struct inode *inode; 177237fead6SMichael Halcrow 178*b2648d51SAl Viro rc = lock_parent(ecryptfs_dentry, &lower_dentry, &lower_dir); 179*b2648d51SAl Viro if (!rc) 180*b2648d51SAl Viro rc = vfs_create(&init_user_ns, lower_dir, 181*b2648d51SAl Viro lower_dentry, mode, true); 1824981e081SMichael Halcrow if (rc) { 183caeeeecfSMichael Halcrow printk(KERN_ERR "%s: Failure to create dentry in lower fs; " 18418d1dbf1SHarvey Harrison "rc = [%d]\n", __func__, rc); 185b59db43aSTyler Hicks inode = ERR_PTR(rc); 186237fead6SMichael Halcrow goto out_lock; 187237fead6SMichael Halcrow } 1882b0143b5SDavid Howells inode = __ecryptfs_get_inode(d_inode(lower_dentry), 1895ccf9203STyler Hicks directory_inode->i_sb); 1908bc2d3cfSTyler Hicks if (IS_ERR(inode)) { 191*b2648d51SAl Viro vfs_unlink(&init_user_ns, lower_dir, lower_dentry, NULL); 192237fead6SMichael Halcrow goto out_lock; 1938bc2d3cfSTyler Hicks } 194*b2648d51SAl Viro fsstack_copy_attr_times(directory_inode, lower_dir); 195*b2648d51SAl Viro fsstack_copy_inode_size(directory_inode, lower_dir); 196237fead6SMichael Halcrow out_lock: 197*b2648d51SAl Viro inode_unlock(lower_dir); 198b59db43aSTyler Hicks return inode; 199237fead6SMichael Halcrow } 200237fead6SMichael Halcrow 201237fead6SMichael Halcrow /** 202237fead6SMichael Halcrow * ecryptfs_initialize_file 203237fead6SMichael Halcrow * 204237fead6SMichael Halcrow * Cause the file to be changed from a basic empty file to an ecryptfs 205237fead6SMichael Halcrow * file with a header and first data page. 206237fead6SMichael Halcrow * 207237fead6SMichael Halcrow * Returns zero on success 208237fead6SMichael Halcrow */ 209e3ccaa97STyler Hicks int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry, 210b59db43aSTyler Hicks struct inode *ecryptfs_inode) 211237fead6SMichael Halcrow { 212d7cdc5feSMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat = 213b59db43aSTyler Hicks &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat; 214237fead6SMichael Halcrow int rc = 0; 215237fead6SMichael Halcrow 216b59db43aSTyler Hicks if (S_ISDIR(ecryptfs_inode->i_mode)) { 217237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); 218e2bd99ecSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 219d7cdc5feSMichael Halcrow goto out; 220237fead6SMichael Halcrow } 221237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); 222b59db43aSTyler Hicks rc = ecryptfs_new_file_context(ecryptfs_inode); 223237fead6SMichael Halcrow if (rc) { 224d7cdc5feSMichael Halcrow ecryptfs_printk(KERN_ERR, "Error creating new file " 225d7cdc5feSMichael Halcrow "context; rc = [%d]\n", rc); 226d7cdc5feSMichael Halcrow goto out; 227237fead6SMichael Halcrow } 228b59db43aSTyler Hicks rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode); 229391b52f9SMichael Halcrow if (rc) { 230391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 231332ab16fSTyler Hicks "the lower file for the dentry with name " 2329e78d14aSDavid Howells "[%pd]; rc = [%d]\n", __func__, 2339e78d14aSDavid Howells ecryptfs_dentry, rc); 234391b52f9SMichael Halcrow goto out; 235391b52f9SMichael Halcrow } 236b59db43aSTyler Hicks rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode); 237332ab16fSTyler Hicks if (rc) 238d7cdc5feSMichael Halcrow printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); 239b59db43aSTyler Hicks ecryptfs_put_lower_file(ecryptfs_inode); 240237fead6SMichael Halcrow out: 241237fead6SMichael Halcrow return rc; 242237fead6SMichael Halcrow } 243237fead6SMichael Halcrow 244237fead6SMichael Halcrow /** 245237fead6SMichael Halcrow * ecryptfs_create 246237fead6SMichael Halcrow * @dir: The inode of the directory in which to create the file. 247237fead6SMichael Halcrow * @dentry: The eCryptfs dentry 248237fead6SMichael Halcrow * @mode: The mode of the new file. 249237fead6SMichael Halcrow * 250237fead6SMichael Halcrow * Creates a new file. 251237fead6SMichael Halcrow * 252237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 253237fead6SMichael Halcrow */ 254237fead6SMichael Halcrow static int 255549c7297SChristian Brauner ecryptfs_create(struct user_namespace *mnt_userns, 256549c7297SChristian Brauner struct inode *directory_inode, struct dentry *ecryptfs_dentry, 257ebfc3b49SAl Viro umode_t mode, bool excl) 258237fead6SMichael Halcrow { 259b59db43aSTyler Hicks struct inode *ecryptfs_inode; 260237fead6SMichael Halcrow int rc; 261237fead6SMichael Halcrow 262b59db43aSTyler Hicks ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry, 263b59db43aSTyler Hicks mode); 264a1c83681SViresh Kumar if (IS_ERR(ecryptfs_inode)) { 265237fead6SMichael Halcrow ecryptfs_printk(KERN_WARNING, "Failed to create file in" 266237fead6SMichael Halcrow "lower filesystem\n"); 267b59db43aSTyler Hicks rc = PTR_ERR(ecryptfs_inode); 268237fead6SMichael Halcrow goto out; 269237fead6SMichael Halcrow } 270237fead6SMichael Halcrow /* At this point, a file exists on "disk"; we need to make sure 271237fead6SMichael Halcrow * that this on disk file is prepared to be an ecryptfs file */ 272b59db43aSTyler Hicks rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode); 273b59db43aSTyler Hicks if (rc) { 2748bc2d3cfSTyler Hicks ecryptfs_do_unlink(directory_inode, ecryptfs_dentry, 2758bc2d3cfSTyler Hicks ecryptfs_inode); 2760e81ba23SAl Viro iget_failed(ecryptfs_inode); 277b59db43aSTyler Hicks goto out; 278b59db43aSTyler Hicks } 2791e2e547aSAl Viro d_instantiate_new(ecryptfs_dentry, ecryptfs_inode); 280237fead6SMichael Halcrow out: 281237fead6SMichael Halcrow return rc; 282237fead6SMichael Halcrow } 283237fead6SMichael Halcrow 284778aeb42STyler Hicks static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode) 285237fead6SMichael Halcrow { 2862aac0cf8STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 287778aeb42STyler Hicks int rc; 288237fead6SMichael Halcrow 289778aeb42STyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 290391b52f9SMichael Halcrow if (rc) { 291391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 292332ab16fSTyler Hicks "the lower file for the dentry with name " 2939e78d14aSDavid Howells "[%pd]; rc = [%d]\n", __func__, 2949e78d14aSDavid Howells dentry, rc); 295778aeb42STyler Hicks return rc; 296391b52f9SMichael Halcrow } 297778aeb42STyler Hicks 2983b06b3ebSTyler Hicks crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; 2992aac0cf8STyler Hicks /* TODO: lock for crypt_stat comparison */ 3002aac0cf8STyler Hicks if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) 3012aac0cf8STyler Hicks ecryptfs_set_default_sizes(crypt_stat); 302778aeb42STyler Hicks 303778aeb42STyler Hicks rc = ecryptfs_read_and_validate_header_region(inode); 304778aeb42STyler Hicks ecryptfs_put_lower_file(inode); 305237fead6SMichael Halcrow if (rc) { 306778aeb42STyler Hicks rc = ecryptfs_read_and_validate_xattr_region(dentry, inode); 307778aeb42STyler Hicks if (!rc) 308dd2a3b7aSMichael Halcrow crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; 309dd2a3b7aSMichael Halcrow } 310778aeb42STyler Hicks 311778aeb42STyler Hicks /* Must return 0 to allow non-eCryptfs files to be looked up, too */ 312778aeb42STyler Hicks return 0; 313778aeb42STyler Hicks } 314778aeb42STyler Hicks 315778aeb42STyler Hicks /** 316778aeb42STyler Hicks * ecryptfs_lookup_interpose - Dentry interposition for a lookup 317778aeb42STyler Hicks */ 318b1168a92SAl Viro static struct dentry *ecryptfs_lookup_interpose(struct dentry *dentry, 319b1168a92SAl Viro struct dentry *lower_dentry) 320778aeb42STyler Hicks { 321762c6968SAl Viro struct path *path = ecryptfs_dentry_to_lower_path(dentry->d_parent); 322e72b9dd6SAl Viro struct inode *inode, *lower_inode; 323778aeb42STyler Hicks struct ecryptfs_dentry_info *dentry_info; 324778aeb42STyler Hicks int rc = 0; 325778aeb42STyler Hicks 326778aeb42STyler Hicks dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); 327778aeb42STyler Hicks if (!dentry_info) { 328237fead6SMichael Halcrow dput(lower_dentry); 329b1168a92SAl Viro return ERR_PTR(-ENOMEM); 330778aeb42STyler Hicks } 3310b1d9011SAl Viro 332b1168a92SAl Viro fsstack_copy_attr_atime(d_inode(dentry->d_parent), 333762c6968SAl Viro d_inode(path->dentry)); 33484d08fa8SAl Viro BUG_ON(!d_count(lower_dentry)); 3350b1d9011SAl Viro 3360b1d9011SAl Viro ecryptfs_set_dentry_private(dentry, dentry_info); 337762c6968SAl Viro dentry_info->lower_path.mnt = mntget(path->mnt); 33892dd1230SAl Viro dentry_info->lower_path.dentry = lower_dentry; 339778aeb42STyler Hicks 340e72b9dd6SAl Viro /* 341e72b9dd6SAl Viro * negative dentry can go positive under us here - its parent is not 342e72b9dd6SAl Viro * locked. That's OK and that could happen just as we return from 343e72b9dd6SAl Viro * ecryptfs_lookup() anyway. Just need to be careful and fetch 344e72b9dd6SAl Viro * ->d_inode only once - it's not stable here. 345e72b9dd6SAl Viro */ 346e72b9dd6SAl Viro lower_inode = READ_ONCE(lower_dentry->d_inode); 347e72b9dd6SAl Viro 348e72b9dd6SAl Viro if (!lower_inode) { 349778aeb42STyler Hicks /* We want to add because we couldn't find in lower */ 350778aeb42STyler Hicks d_add(dentry, NULL); 351b1168a92SAl Viro return NULL; 352778aeb42STyler Hicks } 353b1168a92SAl Viro inode = __ecryptfs_get_inode(lower_inode, dentry->d_sb); 354778aeb42STyler Hicks if (IS_ERR(inode)) { 355778aeb42STyler Hicks printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n", 356778aeb42STyler Hicks __func__, PTR_ERR(inode)); 357b1168a92SAl Viro return ERR_CAST(inode); 358778aeb42STyler Hicks } 359778aeb42STyler Hicks if (S_ISREG(inode->i_mode)) { 360778aeb42STyler Hicks rc = ecryptfs_i_size_read(dentry, inode); 361778aeb42STyler Hicks if (rc) { 362778aeb42STyler Hicks make_bad_inode(inode); 363b1168a92SAl Viro return ERR_PTR(rc); 364778aeb42STyler Hicks } 365778aeb42STyler Hicks } 366778aeb42STyler Hicks 367778aeb42STyler Hicks if (inode->i_state & I_NEW) 368778aeb42STyler Hicks unlock_new_inode(inode); 369b1168a92SAl Viro return d_splice_alias(inode, dentry); 370addd65adSMichael Halcrow } 371addd65adSMichael Halcrow 372addd65adSMichael Halcrow /** 373addd65adSMichael Halcrow * ecryptfs_lookup 374addd65adSMichael Halcrow * @ecryptfs_dir_inode: The eCryptfs directory inode 375addd65adSMichael Halcrow * @ecryptfs_dentry: The eCryptfs dentry that we are looking up 37689076bc3SAl Viro * @flags: lookup flags 377addd65adSMichael Halcrow * 378addd65adSMichael Halcrow * Find a file on disk. If the file does not exist, then we'll add it to the 379addd65adSMichael Halcrow * dentry cache and continue on to read it from the disk. 380addd65adSMichael Halcrow */ 381addd65adSMichael Halcrow static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, 382addd65adSMichael Halcrow struct dentry *ecryptfs_dentry, 38300cd8dd3SAl Viro unsigned int flags) 384addd65adSMichael Halcrow { 385addd65adSMichael Halcrow char *encrypted_and_encoded_name = NULL; 38688ae4ab9SAl Viro struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 387addd65adSMichael Halcrow struct dentry *lower_dir_dentry, *lower_dentry; 38888ae4ab9SAl Viro const char *name = ecryptfs_dentry->d_name.name; 38988ae4ab9SAl Viro size_t len = ecryptfs_dentry->d_name.len; 390b1168a92SAl Viro struct dentry *res; 391addd65adSMichael Halcrow int rc = 0; 392addd65adSMichael Halcrow 393addd65adSMichael Halcrow lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); 39488ae4ab9SAl Viro 395addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 396addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 397ab13a921SGuenter Roeck if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { 398addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename( 39988ae4ab9SAl Viro &encrypted_and_encoded_name, &len, 40088ae4ab9SAl Viro mount_crypt_stat, name, len); 401addd65adSMichael Halcrow if (rc) { 402addd65adSMichael Halcrow printk(KERN_ERR "%s: Error attempting to encrypt and encode " 403addd65adSMichael Halcrow "filename; rc = [%d]\n", __func__, rc); 404237fead6SMichael Halcrow return ERR_PTR(rc); 405237fead6SMichael Halcrow } 40688ae4ab9SAl Viro name = encrypted_and_encoded_name; 40788ae4ab9SAl Viro } 40888ae4ab9SAl Viro 40988ae4ab9SAl Viro lower_dentry = lookup_one_len_unlocked(name, lower_dir_dentry, len); 410237fead6SMichael Halcrow if (IS_ERR(lower_dentry)) { 411237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 412b1168a92SAl Viro "[%ld] on lower_dentry = [%s]\n", __func__, 413b1168a92SAl Viro PTR_ERR(lower_dentry), 41488ae4ab9SAl Viro name); 415b1168a92SAl Viro res = ERR_CAST(lower_dentry); 41688ae4ab9SAl Viro } else { 417b1168a92SAl Viro res = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry); 41888ae4ab9SAl Viro } 419237fead6SMichael Halcrow kfree(encrypted_and_encoded_name); 420b1168a92SAl Viro return res; 421237fead6SMichael Halcrow } 422237fead6SMichael Halcrow 423237fead6SMichael Halcrow static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, 424237fead6SMichael Halcrow struct dentry *new_dentry) 425237fead6SMichael Halcrow { 426237fead6SMichael Halcrow struct dentry *lower_old_dentry; 427237fead6SMichael Halcrow struct dentry *lower_new_dentry; 428*b2648d51SAl Viro struct inode *lower_dir; 429237fead6SMichael Halcrow u64 file_size_save; 430237fead6SMichael Halcrow int rc; 431237fead6SMichael Halcrow 4322b0143b5SDavid Howells file_size_save = i_size_read(d_inode(old_dentry)); 433237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 434*b2648d51SAl Viro rc = lock_parent(new_dentry, &lower_new_dentry, &lower_dir); 435*b2648d51SAl Viro if (!rc) 436*b2648d51SAl Viro rc = vfs_link(lower_old_dentry, &init_user_ns, lower_dir, 437*b2648d51SAl Viro lower_new_dentry, NULL); 4382b0143b5SDavid Howells if (rc || d_really_is_negative(lower_new_dentry)) 439237fead6SMichael Halcrow goto out_lock; 4405ccf9203STyler Hicks rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); 441237fead6SMichael Halcrow if (rc) 442237fead6SMichael Halcrow goto out_lock; 443*b2648d51SAl Viro fsstack_copy_attr_times(dir, lower_dir); 444*b2648d51SAl Viro fsstack_copy_inode_size(dir, lower_dir); 4452b0143b5SDavid Howells set_nlink(d_inode(old_dentry), 4462b0143b5SDavid Howells ecryptfs_inode_to_lower(d_inode(old_dentry))->i_nlink); 4472b0143b5SDavid Howells i_size_write(d_inode(new_dentry), file_size_save); 448237fead6SMichael Halcrow out_lock: 449*b2648d51SAl Viro inode_unlock(lower_dir); 450237fead6SMichael Halcrow return rc; 451237fead6SMichael Halcrow } 452237fead6SMichael Halcrow 453237fead6SMichael Halcrow static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) 454237fead6SMichael Halcrow { 4552b0143b5SDavid Howells return ecryptfs_do_unlink(dir, dentry, d_inode(dentry)); 456237fead6SMichael Halcrow } 457237fead6SMichael Halcrow 458549c7297SChristian Brauner static int ecryptfs_symlink(struct user_namespace *mnt_userns, 459549c7297SChristian Brauner struct inode *dir, struct dentry *dentry, 460237fead6SMichael Halcrow const char *symname) 461237fead6SMichael Halcrow { 462237fead6SMichael Halcrow int rc; 463237fead6SMichael Halcrow struct dentry *lower_dentry; 464*b2648d51SAl Viro struct inode *lower_dir; 465237fead6SMichael Halcrow char *encoded_symname; 466addd65adSMichael Halcrow size_t encoded_symlen; 467addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 468237fead6SMichael Halcrow 469*b2648d51SAl Viro rc = lock_parent(dentry, &lower_dentry, &lower_dir); 470*b2648d51SAl Viro if (rc) 471*b2648d51SAl Viro goto out_lock; 472addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 473addd65adSMichael Halcrow dir->i_sb)->mount_crypt_stat; 474addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, 475addd65adSMichael Halcrow &encoded_symlen, 476addd65adSMichael Halcrow mount_crypt_stat, symname, 477addd65adSMichael Halcrow strlen(symname)); 478addd65adSMichael Halcrow if (rc) 479237fead6SMichael Halcrow goto out_lock; 480*b2648d51SAl Viro rc = vfs_symlink(&init_user_ns, lower_dir, lower_dentry, 481db2e747bSMiklos Szeredi encoded_symname); 482237fead6SMichael Halcrow kfree(encoded_symname); 4832b0143b5SDavid Howells if (rc || d_really_is_negative(lower_dentry)) 484237fead6SMichael Halcrow goto out_lock; 4855ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 486237fead6SMichael Halcrow if (rc) 487237fead6SMichael Halcrow goto out_lock; 488*b2648d51SAl Viro fsstack_copy_attr_times(dir, lower_dir); 489*b2648d51SAl Viro fsstack_copy_inode_size(dir, lower_dir); 490237fead6SMichael Halcrow out_lock: 491*b2648d51SAl Viro inode_unlock(lower_dir); 4922b0143b5SDavid Howells if (d_really_is_negative(dentry)) 493237fead6SMichael Halcrow d_drop(dentry); 494237fead6SMichael Halcrow return rc; 495237fead6SMichael Halcrow } 496237fead6SMichael Halcrow 497549c7297SChristian Brauner static int ecryptfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir, 498549c7297SChristian Brauner struct dentry *dentry, umode_t mode) 499237fead6SMichael Halcrow { 500237fead6SMichael Halcrow int rc; 501237fead6SMichael Halcrow struct dentry *lower_dentry; 502*b2648d51SAl Viro struct inode *lower_dir; 503237fead6SMichael Halcrow 504*b2648d51SAl Viro rc = lock_parent(dentry, &lower_dentry, &lower_dir); 505*b2648d51SAl Viro if (!rc) 506*b2648d51SAl Viro rc = vfs_mkdir(&init_user_ns, lower_dir, 507*b2648d51SAl Viro lower_dentry, mode); 5082b0143b5SDavid Howells if (rc || d_really_is_negative(lower_dentry)) 509237fead6SMichael Halcrow goto out; 5105ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 511237fead6SMichael Halcrow if (rc) 512237fead6SMichael Halcrow goto out; 513*b2648d51SAl Viro fsstack_copy_attr_times(dir, lower_dir); 514*b2648d51SAl Viro fsstack_copy_inode_size(dir, lower_dir); 515*b2648d51SAl Viro set_nlink(dir, lower_dir->i_nlink); 516237fead6SMichael Halcrow out: 517*b2648d51SAl Viro inode_unlock(lower_dir); 5182b0143b5SDavid Howells if (d_really_is_negative(dentry)) 519237fead6SMichael Halcrow d_drop(dentry); 520237fead6SMichael Halcrow return rc; 521237fead6SMichael Halcrow } 522237fead6SMichael Halcrow 523237fead6SMichael Halcrow static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) 524237fead6SMichael Halcrow { 525237fead6SMichael Halcrow struct dentry *lower_dentry; 526*b2648d51SAl Viro struct inode *lower_dir; 52745ec4abaSMichael Halcrow int rc; 528237fead6SMichael Halcrow 529*b2648d51SAl Viro rc = lock_parent(dentry, &lower_dentry, &lower_dir); 530bcf0d9d4SAl Viro dget(lower_dentry); // don't even try to make the lower negative 531*b2648d51SAl Viro if (!rc) { 532*b2648d51SAl Viro if (d_unhashed(lower_dentry)) 533bcf0d9d4SAl Viro rc = -EINVAL; 534bcf0d9d4SAl Viro else 535*b2648d51SAl Viro rc = vfs_rmdir(&init_user_ns, lower_dir, lower_dentry); 536*b2648d51SAl Viro } 537bcf0d9d4SAl Viro if (!rc) { 5382b0143b5SDavid Howells clear_nlink(d_inode(dentry)); 539*b2648d51SAl Viro fsstack_copy_attr_times(dir, lower_dir); 540*b2648d51SAl Viro set_nlink(dir, lower_dir->i_nlink); 541bcf0d9d4SAl Viro } 542bcf0d9d4SAl Viro dput(lower_dentry); 543*b2648d51SAl Viro inode_unlock(lower_dir); 544237fead6SMichael Halcrow if (!rc) 545237fead6SMichael Halcrow d_drop(dentry); 546237fead6SMichael Halcrow return rc; 547237fead6SMichael Halcrow } 548237fead6SMichael Halcrow 549237fead6SMichael Halcrow static int 550549c7297SChristian Brauner ecryptfs_mknod(struct user_namespace *mnt_userns, struct inode *dir, 551549c7297SChristian Brauner struct dentry *dentry, umode_t mode, dev_t dev) 552237fead6SMichael Halcrow { 553237fead6SMichael Halcrow int rc; 554237fead6SMichael Halcrow struct dentry *lower_dentry; 555*b2648d51SAl Viro struct inode *lower_dir; 556237fead6SMichael Halcrow 557*b2648d51SAl Viro rc = lock_parent(dentry, &lower_dentry, &lower_dir); 558*b2648d51SAl Viro if (!rc) 559*b2648d51SAl Viro rc = vfs_mknod(&init_user_ns, lower_dir, 560*b2648d51SAl Viro lower_dentry, mode, dev); 5612b0143b5SDavid Howells if (rc || d_really_is_negative(lower_dentry)) 562237fead6SMichael Halcrow goto out; 5635ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 564237fead6SMichael Halcrow if (rc) 565237fead6SMichael Halcrow goto out; 566*b2648d51SAl Viro fsstack_copy_attr_times(dir, lower_dir); 567*b2648d51SAl Viro fsstack_copy_inode_size(dir, lower_dir); 568237fead6SMichael Halcrow out: 569*b2648d51SAl Viro inode_unlock(lower_dir); 5702b0143b5SDavid Howells if (d_really_is_negative(dentry)) 571237fead6SMichael Halcrow d_drop(dentry); 572237fead6SMichael Halcrow return rc; 573237fead6SMichael Halcrow } 574237fead6SMichael Halcrow 575237fead6SMichael Halcrow static int 576549c7297SChristian Brauner ecryptfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir, 577549c7297SChristian Brauner struct dentry *old_dentry, struct inode *new_dir, 578549c7297SChristian Brauner struct dentry *new_dentry, unsigned int flags) 579237fead6SMichael Halcrow { 580237fead6SMichael Halcrow int rc; 581237fead6SMichael Halcrow struct dentry *lower_old_dentry; 582237fead6SMichael Halcrow struct dentry *lower_new_dentry; 583237fead6SMichael Halcrow struct dentry *lower_old_dir_dentry; 584237fead6SMichael Halcrow struct dentry *lower_new_dir_dentry; 585bcf0d9d4SAl Viro struct dentry *trap; 5868335eafcSTyler Hicks struct inode *target_inode; 5879fe61450SChristian Brauner struct renamedata rd = {}; 588237fead6SMichael Halcrow 5891cd66c93SMiklos Szeredi if (flags) 5901cd66c93SMiklos Szeredi return -EINVAL; 5911cd66c93SMiklos Szeredi 592bcf0d9d4SAl Viro lower_old_dir_dentry = ecryptfs_dentry_to_lower(old_dentry->d_parent); 593bcf0d9d4SAl Viro lower_new_dir_dentry = ecryptfs_dentry_to_lower(new_dentry->d_parent); 594bcf0d9d4SAl Viro 595237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 596237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 597bcf0d9d4SAl Viro 5982b0143b5SDavid Howells target_inode = d_inode(new_dentry); 599bcf0d9d4SAl Viro 6000d132f73SErez Zadok trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 601bcf0d9d4SAl Viro dget(lower_new_dentry); 6020d132f73SErez Zadok rc = -EINVAL; 60374dd7c97SAl Viro if (lower_old_dentry->d_parent != lower_old_dir_dentry) 6040d132f73SErez Zadok goto out_lock; 60574dd7c97SAl Viro if (lower_new_dentry->d_parent != lower_new_dir_dentry) 60674dd7c97SAl Viro goto out_lock; 60774dd7c97SAl Viro if (d_unhashed(lower_old_dentry) || d_unhashed(lower_new_dentry)) 60874dd7c97SAl Viro goto out_lock; 60974dd7c97SAl Viro /* source should not be ancestor of target */ 61074dd7c97SAl Viro if (trap == lower_old_dentry) 61174dd7c97SAl Viro goto out_lock; 6120d132f73SErez Zadok /* target should not be ancestor of source */ 6130d132f73SErez Zadok if (trap == lower_new_dentry) { 6140d132f73SErez Zadok rc = -ENOTEMPTY; 6150d132f73SErez Zadok goto out_lock; 6160d132f73SErez Zadok } 6179fe61450SChristian Brauner 6186521f891SChristian Brauner rd.old_mnt_userns = &init_user_ns; 6199fe61450SChristian Brauner rd.old_dir = d_inode(lower_old_dir_dentry); 6209fe61450SChristian Brauner rd.old_dentry = lower_old_dentry; 6216521f891SChristian Brauner rd.new_mnt_userns = &init_user_ns; 6229fe61450SChristian Brauner rd.new_dir = d_inode(lower_new_dir_dentry); 6239fe61450SChristian Brauner rd.new_dentry = lower_new_dentry; 6249fe61450SChristian Brauner rc = vfs_rename(&rd); 625237fead6SMichael Halcrow if (rc) 626237fead6SMichael Halcrow goto out_lock; 6278335eafcSTyler Hicks if (target_inode) 6288335eafcSTyler Hicks fsstack_copy_attr_all(target_inode, 6298335eafcSTyler Hicks ecryptfs_inode_to_lower(target_inode)); 6302b0143b5SDavid Howells fsstack_copy_attr_all(new_dir, d_inode(lower_new_dir_dentry)); 631237fead6SMichael Halcrow if (new_dir != old_dir) 6322b0143b5SDavid Howells fsstack_copy_attr_all(old_dir, d_inode(lower_old_dir_dentry)); 633237fead6SMichael Halcrow out_lock: 634237fead6SMichael Halcrow dput(lower_new_dentry); 635bcf0d9d4SAl Viro unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 636237fead6SMichael Halcrow return rc; 637237fead6SMichael Halcrow } 638237fead6SMichael Halcrow 639b22e8fedSAl Viro static char *ecryptfs_readlink_lower(struct dentry *dentry, size_t *bufsiz) 640237fead6SMichael Halcrow { 6416c988f57SMiklos Szeredi DEFINE_DELAYED_CALL(done); 6423a60a168STyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 6436c988f57SMiklos Szeredi const char *link; 644b22e8fedSAl Viro char *buf; 645addd65adSMichael Halcrow int rc; 646237fead6SMichael Halcrow 6476c988f57SMiklos Szeredi link = vfs_get_link(lower_dentry, &done); 6486c988f57SMiklos Szeredi if (IS_ERR(link)) 6496c988f57SMiklos Szeredi return ERR_CAST(link); 6506c988f57SMiklos Szeredi 651b22e8fedSAl Viro rc = ecryptfs_decode_and_decrypt_filename(&buf, bufsiz, dentry->d_sb, 6526c988f57SMiklos Szeredi link, strlen(link)); 6536c988f57SMiklos Szeredi do_delayed_call(&done); 6546c988f57SMiklos Szeredi if (rc) 6556c988f57SMiklos Szeredi return ERR_PTR(rc); 6566c988f57SMiklos Szeredi 6576c988f57SMiklos Szeredi return buf; 6583a60a168STyler Hicks } 6593a60a168STyler Hicks 6606b255391SAl Viro static const char *ecryptfs_get_link(struct dentry *dentry, 661fceef393SAl Viro struct inode *inode, 662fceef393SAl Viro struct delayed_call *done) 663237fead6SMichael Halcrow { 664b22e8fedSAl Viro size_t len; 6656b255391SAl Viro char *buf; 6666b255391SAl Viro 6676b255391SAl Viro if (!dentry) 6686b255391SAl Viro return ERR_PTR(-ECHILD); 6696b255391SAl Viro 6706b255391SAl Viro buf = ecryptfs_readlink_lower(dentry, &len); 671b22e8fedSAl Viro if (IS_ERR(buf)) 672680baacbSAl Viro return buf; 6732b0143b5SDavid Howells fsstack_copy_attr_atime(d_inode(dentry), 6742b0143b5SDavid Howells d_inode(ecryptfs_dentry_to_lower(dentry))); 675408bd629SAl Viro buf[len] = '\0'; 676fceef393SAl Viro set_delayed_call(done, kfree_link, buf); 677fceef393SAl Viro return buf; 678237fead6SMichael Halcrow } 679237fead6SMichael Halcrow 680237fead6SMichael Halcrow /** 681237fead6SMichael Halcrow * upper_size_to_lower_size 682237fead6SMichael Halcrow * @crypt_stat: Crypt_stat associated with file 683237fead6SMichael Halcrow * @upper_size: Size of the upper file 684237fead6SMichael Halcrow * 685cc11beffSMichael Halcrow * Calculate the required size of the lower file based on the 686237fead6SMichael Halcrow * specified size of the upper file. This calculation is based on the 687237fead6SMichael Halcrow * number of headers in the underlying file and the extent size. 688237fead6SMichael Halcrow * 689237fead6SMichael Halcrow * Returns Calculated size of the lower file. 690237fead6SMichael Halcrow */ 691237fead6SMichael Halcrow static loff_t 692237fead6SMichael Halcrow upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, 693237fead6SMichael Halcrow loff_t upper_size) 694237fead6SMichael Halcrow { 695237fead6SMichael Halcrow loff_t lower_size; 696237fead6SMichael Halcrow 697157f1071STyler Hicks lower_size = ecryptfs_lower_header_size(crypt_stat); 698237fead6SMichael Halcrow if (upper_size != 0) { 699237fead6SMichael Halcrow loff_t num_extents; 700237fead6SMichael Halcrow 701237fead6SMichael Halcrow num_extents = upper_size >> crypt_stat->extent_shift; 702237fead6SMichael Halcrow if (upper_size & ~crypt_stat->extent_mask) 703237fead6SMichael Halcrow num_extents++; 704237fead6SMichael Halcrow lower_size += (num_extents * crypt_stat->extent_size); 705237fead6SMichael Halcrow } 706237fead6SMichael Halcrow return lower_size; 707237fead6SMichael Halcrow } 708237fead6SMichael Halcrow 709237fead6SMichael Halcrow /** 7105f3ef64fSTyler Hicks * truncate_upper 711237fead6SMichael Halcrow * @dentry: The ecryptfs layer dentry 7125f3ef64fSTyler Hicks * @ia: Address of the ecryptfs inode's attributes 7135f3ef64fSTyler Hicks * @lower_ia: Address of the lower inode's attributes 714237fead6SMichael Halcrow * 715237fead6SMichael Halcrow * Function to handle truncations modifying the size of the file. Note 716237fead6SMichael Halcrow * that the file sizes are interpolated. When expanding, we are simply 7175f3ef64fSTyler Hicks * writing strings of 0's out. When truncating, we truncate the upper 7185f3ef64fSTyler Hicks * inode and update the lower_ia according to the page index 7195f3ef64fSTyler Hicks * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, 7205f3ef64fSTyler Hicks * the caller must use lower_ia in a call to notify_change() to perform 7215f3ef64fSTyler Hicks * the truncation of the lower inode. 722237fead6SMichael Halcrow * 723237fead6SMichael Halcrow * Returns zero on success; non-zero otherwise 724237fead6SMichael Halcrow */ 7255f3ef64fSTyler Hicks static int truncate_upper(struct dentry *dentry, struct iattr *ia, 7265f3ef64fSTyler Hicks struct iattr *lower_ia) 727237fead6SMichael Halcrow { 728237fead6SMichael Halcrow int rc = 0; 7292b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 730237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 731237fead6SMichael Halcrow loff_t i_size = i_size_read(inode); 732237fead6SMichael Halcrow loff_t lower_size_before_truncate; 733237fead6SMichael Halcrow loff_t lower_size_after_truncate; 734237fead6SMichael Halcrow 7355f3ef64fSTyler Hicks if (unlikely((ia->ia_size == i_size))) { 7365f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 737332ab16fSTyler Hicks return 0; 7385f3ef64fSTyler Hicks } 7393b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 740332ab16fSTyler Hicks if (rc) 741332ab16fSTyler Hicks return rc; 7422b0143b5SDavid Howells crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; 743237fead6SMichael Halcrow /* Switch on growing or shrinking file */ 7445f3ef64fSTyler Hicks if (ia->ia_size > i_size) { 7452ed92554SMichael Halcrow char zero[] = { 0x00 }; 746240e2df5SMichael Halcrow 7475f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 7482ed92554SMichael Halcrow /* Write a single 0 at the last position of the file; 7492ed92554SMichael Halcrow * this triggers code that will fill in 0's throughout 7502ed92554SMichael Halcrow * the intermediate portion of the previous end of the 7512ed92554SMichael Halcrow * file and the new and of the file */ 75248c1e44aSAl Viro rc = ecryptfs_write(inode, zero, 7535f3ef64fSTyler Hicks (ia->ia_size - 1), 1); 7545f3ef64fSTyler Hicks } else { /* ia->ia_size < i_size_read(inode) */ 7555f3ef64fSTyler Hicks /* We're chopping off all the pages down to the page 7565f3ef64fSTyler Hicks * in which ia->ia_size is located. Fill in the end of 757ea1754a0SKirill A. Shutemov * that page from (ia->ia_size & ~PAGE_MASK) to 758ea1754a0SKirill A. Shutemov * PAGE_SIZE with zeros. */ 75909cbfeafSKirill A. Shutemov size_t num_zeros = (PAGE_SIZE 76009cbfeafSKirill A. Shutemov - (ia->ia_size & ~PAGE_MASK)); 7612ed92554SMichael Halcrow 7622c27c65eSChristoph Hellwig if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { 7632c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 7645f3ef64fSTyler Hicks lower_ia->ia_size = ia->ia_size; 7655f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 76648c1e44aSAl Viro goto out; 76713a791b4STyler Hicks } 7682ed92554SMichael Halcrow if (num_zeros) { 7692ed92554SMichael Halcrow char *zeros_virt; 7702ed92554SMichael Halcrow 7712ed92554SMichael Halcrow zeros_virt = kzalloc(num_zeros, GFP_KERNEL); 7722ed92554SMichael Halcrow if (!zeros_virt) { 7732ed92554SMichael Halcrow rc = -ENOMEM; 77448c1e44aSAl Viro goto out; 775240e2df5SMichael Halcrow } 77648c1e44aSAl Viro rc = ecryptfs_write(inode, zeros_virt, 7775f3ef64fSTyler Hicks ia->ia_size, num_zeros); 7782ed92554SMichael Halcrow kfree(zeros_virt); 7795dda6992SMichael Halcrow if (rc) { 780240e2df5SMichael Halcrow printk(KERN_ERR "Error attempting to zero out " 781240e2df5SMichael Halcrow "the remainder of the end page on " 782240e2df5SMichael Halcrow "reducing truncate; rc = [%d]\n", rc); 78348c1e44aSAl Viro goto out; 784240e2df5SMichael Halcrow } 785240e2df5SMichael Halcrow } 7862c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 7870216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 788dd2a3b7aSMichael Halcrow if (rc) { 789dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 790dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 791dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 79248c1e44aSAl Viro goto out; 793dd2a3b7aSMichael Halcrow } 794237fead6SMichael Halcrow /* We are reducing the size of the ecryptfs file, and need to 795237fead6SMichael Halcrow * know if we need to reduce the size of the lower file. */ 796237fead6SMichael Halcrow lower_size_before_truncate = 797237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, i_size); 798237fead6SMichael Halcrow lower_size_after_truncate = 7995f3ef64fSTyler Hicks upper_size_to_lower_size(crypt_stat, ia->ia_size); 8005f3ef64fSTyler Hicks if (lower_size_after_truncate < lower_size_before_truncate) { 8015f3ef64fSTyler Hicks lower_ia->ia_size = lower_size_after_truncate; 8025f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 8035f3ef64fSTyler Hicks } else 8045f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 805237fead6SMichael Halcrow } 806237fead6SMichael Halcrow out: 807332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 808237fead6SMichael Halcrow return rc; 809237fead6SMichael Halcrow } 810237fead6SMichael Halcrow 811a261a039STyler Hicks static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset) 812a261a039STyler Hicks { 813a261a039STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 814a261a039STyler Hicks loff_t lower_oldsize, lower_newsize; 815a261a039STyler Hicks 816a261a039STyler Hicks crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; 817a261a039STyler Hicks lower_oldsize = upper_size_to_lower_size(crypt_stat, 818a261a039STyler Hicks i_size_read(inode)); 819a261a039STyler Hicks lower_newsize = upper_size_to_lower_size(crypt_stat, offset); 820a261a039STyler Hicks if (lower_newsize > lower_oldsize) { 821a261a039STyler Hicks /* 822a261a039STyler Hicks * The eCryptfs inode and the new *lower* size are mixed here 823a261a039STyler Hicks * because we may not have the lower i_mutex held and/or it may 824a261a039STyler Hicks * not be appropriate to call inode_newsize_ok() with inodes 825a261a039STyler Hicks * from other filesystems. 826a261a039STyler Hicks */ 827a261a039STyler Hicks return inode_newsize_ok(inode, lower_newsize); 828a261a039STyler Hicks } 829a261a039STyler Hicks 830a261a039STyler Hicks return 0; 831a261a039STyler Hicks } 832a261a039STyler Hicks 8335f3ef64fSTyler Hicks /** 8345f3ef64fSTyler Hicks * ecryptfs_truncate 8355f3ef64fSTyler Hicks * @dentry: The ecryptfs layer dentry 8365f3ef64fSTyler Hicks * @new_length: The length to expand the file to 8375f3ef64fSTyler Hicks * 8385f3ef64fSTyler Hicks * Simple function that handles the truncation of an eCryptfs inode and 8395f3ef64fSTyler Hicks * its corresponding lower inode. 8405f3ef64fSTyler Hicks * 8415f3ef64fSTyler Hicks * Returns zero on success; non-zero otherwise 8425f3ef64fSTyler Hicks */ 8435f3ef64fSTyler Hicks int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) 8445f3ef64fSTyler Hicks { 8455f3ef64fSTyler Hicks struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; 8465f3ef64fSTyler Hicks struct iattr lower_ia = { .ia_valid = 0 }; 8475f3ef64fSTyler Hicks int rc; 8485f3ef64fSTyler Hicks 8492b0143b5SDavid Howells rc = ecryptfs_inode_newsize_ok(d_inode(dentry), new_length); 850a261a039STyler Hicks if (rc) 851a261a039STyler Hicks return rc; 852a261a039STyler Hicks 8535f3ef64fSTyler Hicks rc = truncate_upper(dentry, &ia, &lower_ia); 8545f3ef64fSTyler Hicks if (!rc && lower_ia.ia_valid & ATTR_SIZE) { 8555f3ef64fSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 8565f3ef64fSTyler Hicks 8575955102cSAl Viro inode_lock(d_inode(lower_dentry)); 8582f221d6fSChristian Brauner rc = notify_change(&init_user_ns, lower_dentry, 8592f221d6fSChristian Brauner &lower_ia, NULL); 8605955102cSAl Viro inode_unlock(d_inode(lower_dentry)); 8615f3ef64fSTyler Hicks } 8625f3ef64fSTyler Hicks return rc; 8635f3ef64fSTyler Hicks } 8645f3ef64fSTyler Hicks 865237fead6SMichael Halcrow static int 866549c7297SChristian Brauner ecryptfs_permission(struct user_namespace *mnt_userns, struct inode *inode, 867549c7297SChristian Brauner int mask) 868237fead6SMichael Halcrow { 86947291baaSChristian Brauner return inode_permission(&init_user_ns, 87047291baaSChristian Brauner ecryptfs_inode_to_lower(inode), mask); 871237fead6SMichael Halcrow } 872237fead6SMichael Halcrow 873237fead6SMichael Halcrow /** 874237fead6SMichael Halcrow * ecryptfs_setattr 875237fead6SMichael Halcrow * @dentry: dentry handle to the inode to modify 876237fead6SMichael Halcrow * @ia: Structure with flags of what to change and values 877237fead6SMichael Halcrow * 878237fead6SMichael Halcrow * Updates the metadata of an inode. If the update is to the size 879237fead6SMichael Halcrow * i.e. truncation, then ecryptfs_truncate will handle the size modification 880237fead6SMichael Halcrow * of both the ecryptfs inode and the lower inode. 881237fead6SMichael Halcrow * 882237fead6SMichael Halcrow * All other metadata changes will be passed right to the lower filesystem, 883237fead6SMichael Halcrow * and we will just update our inode to look like the lower. 884237fead6SMichael Halcrow */ 885549c7297SChristian Brauner static int ecryptfs_setattr(struct user_namespace *mnt_userns, 886549c7297SChristian Brauner struct dentry *dentry, struct iattr *ia) 887237fead6SMichael Halcrow { 888237fead6SMichael Halcrow int rc = 0; 889237fead6SMichael Halcrow struct dentry *lower_dentry; 8905f3ef64fSTyler Hicks struct iattr lower_ia; 891237fead6SMichael Halcrow struct inode *inode; 892237fead6SMichael Halcrow struct inode *lower_inode; 893237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 894237fead6SMichael Halcrow 8952b0143b5SDavid Howells crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; 896e81f3340SHerbert Xu if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) { 897e81f3340SHerbert Xu rc = ecryptfs_init_crypt_stat(crypt_stat); 898e81f3340SHerbert Xu if (rc) 899e81f3340SHerbert Xu return rc; 900e81f3340SHerbert Xu } 9012b0143b5SDavid Howells inode = d_inode(dentry); 902237fead6SMichael Halcrow lower_inode = ecryptfs_inode_to_lower(inode); 903e10f281bSMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 904e10f281bSMichael Halcrow mutex_lock(&crypt_stat->cs_mutex); 905e36cb0b8SDavid Howells if (d_is_dir(dentry)) 906e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 907e36cb0b8SDavid Howells else if (d_is_reg(dentry) 90864ee4808SMichael Halcrow && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) 90964ee4808SMichael Halcrow || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { 910e10f281bSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 911e10f281bSMichael Halcrow 912e10f281bSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 913e10f281bSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 9143b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 915332ab16fSTyler Hicks if (rc) { 916332ab16fSTyler Hicks mutex_unlock(&crypt_stat->cs_mutex); 917332ab16fSTyler Hicks goto out; 918332ab16fSTyler Hicks } 919d7cdc5feSMichael Halcrow rc = ecryptfs_read_metadata(dentry); 920332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 9215dda6992SMichael Halcrow if (rc) { 922e10f281bSMichael Halcrow if (!(mount_crypt_stat->flags 923e10f281bSMichael Halcrow & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { 924e10f281bSMichael Halcrow rc = -EIO; 92525bd8174SMichael Halcrow printk(KERN_WARNING "Either the lower file " 926e10f281bSMichael Halcrow "is not in a valid eCryptfs format, " 92725bd8174SMichael Halcrow "or the key could not be retrieved. " 92825bd8174SMichael Halcrow "Plaintext passthrough mode is not " 929e10f281bSMichael Halcrow "enabled; returning -EIO\n"); 930e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 931e10f281bSMichael Halcrow goto out; 932e10f281bSMichael Halcrow } 933e10f281bSMichael Halcrow rc = 0; 9343aeb86eaSTyler Hicks crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED 9353aeb86eaSTyler Hicks | ECRYPTFS_ENCRYPTED); 936e10f281bSMichael Halcrow } 937e10f281bSMichael Halcrow } 938e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 939a261a039STyler Hicks 9402f221d6fSChristian Brauner rc = setattr_prepare(&init_user_ns, dentry, ia); 941a261a039STyler Hicks if (rc) 942a261a039STyler Hicks goto out; 943a261a039STyler Hicks if (ia->ia_valid & ATTR_SIZE) { 944a261a039STyler Hicks rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size); 945a261a039STyler Hicks if (rc) 946a261a039STyler Hicks goto out; 947a261a039STyler Hicks } 948a261a039STyler Hicks 9495f3ef64fSTyler Hicks memcpy(&lower_ia, ia, sizeof(lower_ia)); 9505f3ef64fSTyler Hicks if (ia->ia_valid & ATTR_FILE) 9515f3ef64fSTyler Hicks lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); 952237fead6SMichael Halcrow if (ia->ia_valid & ATTR_SIZE) { 9535f3ef64fSTyler Hicks rc = truncate_upper(dentry, ia, &lower_ia); 954237fead6SMichael Halcrow if (rc < 0) 955237fead6SMichael Halcrow goto out; 956237fead6SMichael Halcrow } 9571ac564ecSJeff Layton 9581ac564ecSJeff Layton /* 9591ac564ecSJeff Layton * mode change is for clearing setuid/setgid bits. Allow lower fs 9601ac564ecSJeff Layton * to interpret this in its own way. 9611ac564ecSJeff Layton */ 9625f3ef64fSTyler Hicks if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 9635f3ef64fSTyler Hicks lower_ia.ia_valid &= ~ATTR_MODE; 9641ac564ecSJeff Layton 9655955102cSAl Viro inode_lock(d_inode(lower_dentry)); 9662f221d6fSChristian Brauner rc = notify_change(&init_user_ns, lower_dentry, &lower_ia, NULL); 9675955102cSAl Viro inode_unlock(d_inode(lower_dentry)); 968237fead6SMichael Halcrow out: 9699afa2fb6SErez Zadok fsstack_copy_attr_all(inode, lower_inode); 970237fead6SMichael Halcrow return rc; 971237fead6SMichael Halcrow } 972237fead6SMichael Halcrow 973549c7297SChristian Brauner static int ecryptfs_getattr_link(struct user_namespace *mnt_userns, 974549c7297SChristian Brauner const struct path *path, struct kstat *stat, 975a528d35eSDavid Howells u32 request_mask, unsigned int flags) 9763a60a168STyler Hicks { 977a528d35eSDavid Howells struct dentry *dentry = path->dentry; 9783a60a168STyler Hicks struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 9793a60a168STyler Hicks int rc = 0; 9803a60a168STyler Hicks 9813a60a168STyler Hicks mount_crypt_stat = &ecryptfs_superblock_to_private( 9823a60a168STyler Hicks dentry->d_sb)->mount_crypt_stat; 9830d56a451SChristian Brauner generic_fillattr(&init_user_ns, d_inode(dentry), stat); 9843a60a168STyler Hicks if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { 9853a60a168STyler Hicks char *target; 9863a60a168STyler Hicks size_t targetsiz; 9873a60a168STyler Hicks 988b22e8fedSAl Viro target = ecryptfs_readlink_lower(dentry, &targetsiz); 989b22e8fedSAl Viro if (!IS_ERR(target)) { 9903a60a168STyler Hicks kfree(target); 9913a60a168STyler Hicks stat->size = targetsiz; 992b22e8fedSAl Viro } else { 993b22e8fedSAl Viro rc = PTR_ERR(target); 9943a60a168STyler Hicks } 9953a60a168STyler Hicks } 9963a60a168STyler Hicks return rc; 9973a60a168STyler Hicks } 9983a60a168STyler Hicks 999549c7297SChristian Brauner static int ecryptfs_getattr(struct user_namespace *mnt_userns, 1000549c7297SChristian Brauner const struct path *path, struct kstat *stat, 1001a528d35eSDavid Howells u32 request_mask, unsigned int flags) 1002f8f484d1STyler Hicks { 1003a528d35eSDavid Howells struct dentry *dentry = path->dentry; 1004f8f484d1STyler Hicks struct kstat lower_stat; 1005f8f484d1STyler Hicks int rc; 1006f8f484d1STyler Hicks 1007a528d35eSDavid Howells rc = vfs_getattr(ecryptfs_dentry_to_lower_path(dentry), &lower_stat, 1008a528d35eSDavid Howells request_mask, flags); 1009f8f484d1STyler Hicks if (!rc) { 10102b0143b5SDavid Howells fsstack_copy_attr_all(d_inode(dentry), 10112b0143b5SDavid Howells ecryptfs_inode_to_lower(d_inode(dentry))); 10120d56a451SChristian Brauner generic_fillattr(&init_user_ns, d_inode(dentry), stat); 1013f8f484d1STyler Hicks stat->blocks = lower_stat.blocks; 1014f8f484d1STyler Hicks } 1015f8f484d1STyler Hicks return rc; 1016f8f484d1STyler Hicks } 1017f8f484d1STyler Hicks 1018dd2a3b7aSMichael Halcrow int 10193767e255SAl Viro ecryptfs_setxattr(struct dentry *dentry, struct inode *inode, 10203767e255SAl Viro const char *name, const void *value, 1021237fead6SMichael Halcrow size_t size, int flags) 1022237fead6SMichael Halcrow { 10235d6c3191SAndreas Gruenbacher int rc; 1024237fead6SMichael Halcrow struct dentry *lower_dentry; 10250b964446SMiklos Szeredi struct inode *lower_inode; 1026237fead6SMichael Halcrow 1027237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 10280b964446SMiklos Szeredi lower_inode = d_inode(lower_dentry); 10290b964446SMiklos Szeredi if (!(lower_inode->i_opflags & IOP_XATTR)) { 1030cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1031237fead6SMichael Halcrow goto out; 1032237fead6SMichael Halcrow } 10330b964446SMiklos Szeredi inode_lock(lower_inode); 10347d6beb71SLinus Torvalds rc = __vfs_setxattr_locked(&init_user_ns, lower_dentry, name, value, size, flags, NULL); 10350b964446SMiklos Szeredi inode_unlock(lower_inode); 10363767e255SAl Viro if (!rc && inode) 10370b964446SMiklos Szeredi fsstack_copy_attr_all(inode, lower_inode); 1038237fead6SMichael Halcrow out: 1039237fead6SMichael Halcrow return rc; 1040237fead6SMichael Halcrow } 1041237fead6SMichael Halcrow 1042dd2a3b7aSMichael Halcrow ssize_t 1043ce23e640SAl Viro ecryptfs_getxattr_lower(struct dentry *lower_dentry, struct inode *lower_inode, 1044ce23e640SAl Viro const char *name, void *value, size_t size) 1045d7cdc5feSMichael Halcrow { 10465d6c3191SAndreas Gruenbacher int rc; 1047d7cdc5feSMichael Halcrow 10485d6c3191SAndreas Gruenbacher if (!(lower_inode->i_opflags & IOP_XATTR)) { 1049cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1050d7cdc5feSMichael Halcrow goto out; 1051d7cdc5feSMichael Halcrow } 1052ce23e640SAl Viro inode_lock(lower_inode); 10535d6c3191SAndreas Gruenbacher rc = __vfs_getxattr(lower_dentry, lower_inode, name, value, size); 1054ce23e640SAl Viro inode_unlock(lower_inode); 1055d7cdc5feSMichael Halcrow out: 1056d7cdc5feSMichael Halcrow return rc; 1057d7cdc5feSMichael Halcrow } 1058d7cdc5feSMichael Halcrow 10597896b631SAdrian Bunk static ssize_t 1060ce23e640SAl Viro ecryptfs_getxattr(struct dentry *dentry, struct inode *inode, 1061ce23e640SAl Viro const char *name, void *value, size_t size) 1062237fead6SMichael Halcrow { 1063ce23e640SAl Viro return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), 1064ce23e640SAl Viro ecryptfs_inode_to_lower(inode), 1065ce23e640SAl Viro name, value, size); 1066237fead6SMichael Halcrow } 1067237fead6SMichael Halcrow 1068237fead6SMichael Halcrow static ssize_t 1069237fead6SMichael Halcrow ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) 1070237fead6SMichael Halcrow { 1071237fead6SMichael Halcrow int rc = 0; 1072237fead6SMichael Halcrow struct dentry *lower_dentry; 1073237fead6SMichael Halcrow 1074237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 10752b0143b5SDavid Howells if (!d_inode(lower_dentry)->i_op->listxattr) { 1076cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1077237fead6SMichael Halcrow goto out; 1078237fead6SMichael Halcrow } 10795955102cSAl Viro inode_lock(d_inode(lower_dentry)); 10802b0143b5SDavid Howells rc = d_inode(lower_dentry)->i_op->listxattr(lower_dentry, list, size); 10815955102cSAl Viro inode_unlock(d_inode(lower_dentry)); 1082237fead6SMichael Halcrow out: 1083237fead6SMichael Halcrow return rc; 1084237fead6SMichael Halcrow } 1085237fead6SMichael Halcrow 10864b899da5SAndreas Gruenbacher static int ecryptfs_removexattr(struct dentry *dentry, struct inode *inode, 10874b899da5SAndreas Gruenbacher const char *name) 1088237fead6SMichael Halcrow { 10895d6c3191SAndreas Gruenbacher int rc; 1090237fead6SMichael Halcrow struct dentry *lower_dentry; 10914b899da5SAndreas Gruenbacher struct inode *lower_inode; 1092237fead6SMichael Halcrow 1093237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 10944b899da5SAndreas Gruenbacher lower_inode = ecryptfs_inode_to_lower(inode); 10955d6c3191SAndreas Gruenbacher if (!(lower_inode->i_opflags & IOP_XATTR)) { 1096cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1097237fead6SMichael Halcrow goto out; 1098237fead6SMichael Halcrow } 10994b899da5SAndreas Gruenbacher inode_lock(lower_inode); 1100c7c7a1a1STycho Andersen rc = __vfs_removexattr(&init_user_ns, lower_dentry, name); 11014b899da5SAndreas Gruenbacher inode_unlock(lower_inode); 1102237fead6SMichael Halcrow out: 1103237fead6SMichael Halcrow return rc; 1104237fead6SMichael Halcrow } 1105237fead6SMichael Halcrow 1106754661f1SArjan van de Ven const struct inode_operations ecryptfs_symlink_iops = { 11076b255391SAl Viro .get_link = ecryptfs_get_link, 1108237fead6SMichael Halcrow .permission = ecryptfs_permission, 1109237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 11103a60a168STyler Hicks .getattr = ecryptfs_getattr_link, 1111237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1112237fead6SMichael Halcrow }; 1113237fead6SMichael Halcrow 1114754661f1SArjan van de Ven const struct inode_operations ecryptfs_dir_iops = { 1115237fead6SMichael Halcrow .create = ecryptfs_create, 1116237fead6SMichael Halcrow .lookup = ecryptfs_lookup, 1117237fead6SMichael Halcrow .link = ecryptfs_link, 1118237fead6SMichael Halcrow .unlink = ecryptfs_unlink, 1119237fead6SMichael Halcrow .symlink = ecryptfs_symlink, 1120237fead6SMichael Halcrow .mkdir = ecryptfs_mkdir, 1121237fead6SMichael Halcrow .rmdir = ecryptfs_rmdir, 1122237fead6SMichael Halcrow .mknod = ecryptfs_mknod, 1123237fead6SMichael Halcrow .rename = ecryptfs_rename, 1124237fead6SMichael Halcrow .permission = ecryptfs_permission, 1125237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1126237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1127237fead6SMichael Halcrow }; 1128237fead6SMichael Halcrow 1129754661f1SArjan van de Ven const struct inode_operations ecryptfs_main_iops = { 1130237fead6SMichael Halcrow .permission = ecryptfs_permission, 1131237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1132f8f484d1STyler Hicks .getattr = ecryptfs_getattr, 1133237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 11344b899da5SAndreas Gruenbacher }; 11354b899da5SAndreas Gruenbacher 11364b899da5SAndreas Gruenbacher static int ecryptfs_xattr_get(const struct xattr_handler *handler, 11374b899da5SAndreas Gruenbacher struct dentry *dentry, struct inode *inode, 11384b899da5SAndreas Gruenbacher const char *name, void *buffer, size_t size) 11394b899da5SAndreas Gruenbacher { 11404b899da5SAndreas Gruenbacher return ecryptfs_getxattr(dentry, inode, name, buffer, size); 11414b899da5SAndreas Gruenbacher } 11424b899da5SAndreas Gruenbacher 11434b899da5SAndreas Gruenbacher static int ecryptfs_xattr_set(const struct xattr_handler *handler, 1144e65ce2a5SChristian Brauner struct user_namespace *mnt_userns, 11454b899da5SAndreas Gruenbacher struct dentry *dentry, struct inode *inode, 11464b899da5SAndreas Gruenbacher const char *name, const void *value, size_t size, 11474b899da5SAndreas Gruenbacher int flags) 11484b899da5SAndreas Gruenbacher { 11494b899da5SAndreas Gruenbacher if (value) 11504b899da5SAndreas Gruenbacher return ecryptfs_setxattr(dentry, inode, name, value, size, flags); 11514b899da5SAndreas Gruenbacher else { 11524b899da5SAndreas Gruenbacher BUG_ON(flags != XATTR_REPLACE); 11534b899da5SAndreas Gruenbacher return ecryptfs_removexattr(dentry, inode, name); 11544b899da5SAndreas Gruenbacher } 11554b899da5SAndreas Gruenbacher } 11564b899da5SAndreas Gruenbacher 1157c036061bSYueHaibing static const struct xattr_handler ecryptfs_xattr_handler = { 11584b899da5SAndreas Gruenbacher .prefix = "", /* match anything */ 11594b899da5SAndreas Gruenbacher .get = ecryptfs_xattr_get, 11604b899da5SAndreas Gruenbacher .set = ecryptfs_xattr_set, 11614b899da5SAndreas Gruenbacher }; 11624b899da5SAndreas Gruenbacher 11634b899da5SAndreas Gruenbacher const struct xattr_handler *ecryptfs_xattr_handlers[] = { 11644b899da5SAndreas Gruenbacher &ecryptfs_xattr_handler, 11654b899da5SAndreas Gruenbacher NULL 1166237fead6SMichael Halcrow }; 1167