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 24237fead6SMichael Halcrow static struct dentry *lock_parent(struct dentry *dentry) 25237fead6SMichael Halcrow { 26237fead6SMichael Halcrow struct dentry *dir; 27237fead6SMichael Halcrow 288dc4e373SMiklos Szeredi dir = dget_parent(dentry); 295955102cSAl Viro inode_lock_nested(d_inode(dir), I_MUTEX_PARENT); 30237fead6SMichael Halcrow return dir; 31237fead6SMichael Halcrow } 32237fead6SMichael Halcrow 33237fead6SMichael Halcrow static void unlock_dir(struct dentry *dir) 34237fead6SMichael Halcrow { 355955102cSAl Viro inode_unlock(d_inode(dir)); 36237fead6SMichael Halcrow dput(dir); 37237fead6SMichael Halcrow } 38237fead6SMichael Halcrow 39c4f79073STyler Hicks static int ecryptfs_inode_test(struct inode *inode, void *lower_inode) 40c4f79073STyler Hicks { 41c4cf3ba4SHimangi Saraogi return ecryptfs_inode_to_lower(inode) == lower_inode; 42c4f79073STyler Hicks } 43c4f79073STyler Hicks 445ccf9203STyler Hicks static int ecryptfs_inode_set(struct inode *inode, void *opaque) 45c4f79073STyler Hicks { 465ccf9203STyler Hicks struct inode *lower_inode = opaque; 475ccf9203STyler Hicks 485ccf9203STyler Hicks ecryptfs_set_inode_lower(inode, lower_inode); 495ccf9203STyler Hicks fsstack_copy_attr_all(inode, lower_inode); 505ccf9203STyler Hicks /* i_size will be overwritten for encrypted regular files */ 515ccf9203STyler Hicks fsstack_copy_inode_size(inode, lower_inode); 525ccf9203STyler Hicks inode->i_ino = lower_inode->i_ino; 53c4f79073STyler Hicks inode->i_mapping->a_ops = &ecryptfs_aops; 545ccf9203STyler Hicks 555ccf9203STyler Hicks if (S_ISLNK(inode->i_mode)) 565ccf9203STyler Hicks inode->i_op = &ecryptfs_symlink_iops; 575ccf9203STyler Hicks else if (S_ISDIR(inode->i_mode)) 585ccf9203STyler Hicks inode->i_op = &ecryptfs_dir_iops; 595ccf9203STyler Hicks else 605ccf9203STyler Hicks inode->i_op = &ecryptfs_main_iops; 615ccf9203STyler Hicks 625ccf9203STyler Hicks if (S_ISDIR(inode->i_mode)) 635ccf9203STyler Hicks inode->i_fop = &ecryptfs_dir_fops; 645ccf9203STyler Hicks else if (special_file(inode->i_mode)) 655ccf9203STyler Hicks init_special_inode(inode, inode->i_mode, inode->i_rdev); 665ccf9203STyler Hicks else 675ccf9203STyler Hicks inode->i_fop = &ecryptfs_main_fops; 685ccf9203STyler Hicks 69c4f79073STyler Hicks return 0; 70c4f79073STyler Hicks } 71c4f79073STyler Hicks 725ccf9203STyler Hicks static struct inode *__ecryptfs_get_inode(struct inode *lower_inode, 735ccf9203STyler Hicks struct super_block *sb) 745ccf9203STyler Hicks { 755ccf9203STyler Hicks struct inode *inode; 765ccf9203STyler Hicks 775ccf9203STyler Hicks if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) 785ccf9203STyler Hicks return ERR_PTR(-EXDEV); 795ccf9203STyler Hicks if (!igrab(lower_inode)) 805ccf9203STyler Hicks return ERR_PTR(-ESTALE); 815ccf9203STyler Hicks inode = iget5_locked(sb, (unsigned long)lower_inode, 825ccf9203STyler Hicks ecryptfs_inode_test, ecryptfs_inode_set, 835ccf9203STyler Hicks lower_inode); 845ccf9203STyler Hicks if (!inode) { 855ccf9203STyler Hicks iput(lower_inode); 865ccf9203STyler Hicks return ERR_PTR(-EACCES); 875ccf9203STyler Hicks } 885ccf9203STyler Hicks if (!(inode->i_state & I_NEW)) 895ccf9203STyler Hicks iput(lower_inode); 905ccf9203STyler Hicks 915ccf9203STyler Hicks return inode; 925ccf9203STyler Hicks } 935ccf9203STyler Hicks 94c4f79073STyler Hicks struct inode *ecryptfs_get_inode(struct inode *lower_inode, 95c4f79073STyler Hicks struct super_block *sb) 96c4f79073STyler Hicks { 975ccf9203STyler Hicks struct inode *inode = __ecryptfs_get_inode(lower_inode, sb); 98c4f79073STyler Hicks 995ccf9203STyler Hicks if (!IS_ERR(inode) && (inode->i_state & I_NEW)) 100c4f79073STyler Hicks unlock_new_inode(inode); 1015ccf9203STyler Hicks 102c4f79073STyler Hicks return inode; 103c4f79073STyler Hicks } 104c4f79073STyler Hicks 105c4f79073STyler Hicks /** 106c4f79073STyler Hicks * ecryptfs_interpose 107c4f79073STyler Hicks * @lower_dentry: Existing dentry in the lower filesystem 108c4f79073STyler Hicks * @dentry: ecryptfs' dentry 109c4f79073STyler Hicks * @sb: ecryptfs's super_block 110c4f79073STyler Hicks * 111c4f79073STyler Hicks * Interposes upper and lower dentries. 112c4f79073STyler Hicks * 113c4f79073STyler Hicks * Returns zero on success; non-zero otherwise 114c4f79073STyler Hicks */ 115c4f79073STyler Hicks static int ecryptfs_interpose(struct dentry *lower_dentry, 1165ccf9203STyler Hicks struct dentry *dentry, struct super_block *sb) 117c4f79073STyler Hicks { 1182b0143b5SDavid Howells struct inode *inode = ecryptfs_get_inode(d_inode(lower_dentry), sb); 1195ccf9203STyler Hicks 120c4f79073STyler Hicks if (IS_ERR(inode)) 121c4f79073STyler Hicks return PTR_ERR(inode); 122c4f79073STyler Hicks d_instantiate(dentry, inode); 1235ccf9203STyler Hicks 124c4f79073STyler Hicks return 0; 125c4f79073STyler Hicks } 126c4f79073STyler Hicks 1278bc2d3cfSTyler Hicks static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry, 1288bc2d3cfSTyler Hicks struct inode *inode) 1298bc2d3cfSTyler Hicks { 1308bc2d3cfSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 1318bc2d3cfSTyler Hicks struct dentry *lower_dir_dentry; 132bcf0d9d4SAl Viro struct inode *lower_dir_inode; 1338bc2d3cfSTyler Hicks int rc; 1348bc2d3cfSTyler Hicks 135bcf0d9d4SAl Viro lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent); 136bcf0d9d4SAl Viro lower_dir_inode = d_inode(lower_dir_dentry); 137bcf0d9d4SAl Viro inode_lock_nested(lower_dir_inode, I_MUTEX_PARENT); 138bcf0d9d4SAl Viro dget(lower_dentry); // don't even try to make the lower negative 139bcf0d9d4SAl Viro if (lower_dentry->d_parent != lower_dir_dentry) 140bcf0d9d4SAl Viro rc = -EINVAL; 141bcf0d9d4SAl Viro else if (d_unhashed(lower_dentry)) 142bcf0d9d4SAl Viro rc = -EINVAL; 143bcf0d9d4SAl Viro else 144*6521f891SChristian Brauner rc = vfs_unlink(&init_user_ns, lower_dir_inode, lower_dentry, 145*6521f891SChristian Brauner NULL); 1468bc2d3cfSTyler Hicks if (rc) { 1478bc2d3cfSTyler Hicks printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); 1488bc2d3cfSTyler Hicks goto out_unlock; 1498bc2d3cfSTyler Hicks } 1508bc2d3cfSTyler Hicks fsstack_copy_attr_times(dir, lower_dir_inode); 1518bc2d3cfSTyler Hicks set_nlink(inode, ecryptfs_inode_to_lower(inode)->i_nlink); 1528bc2d3cfSTyler Hicks inode->i_ctime = dir->i_ctime; 1538bc2d3cfSTyler Hicks out_unlock: 1548bc2d3cfSTyler Hicks dput(lower_dentry); 155bcf0d9d4SAl Viro inode_unlock(lower_dir_inode); 156bcf0d9d4SAl Viro if (!rc) 157bcf0d9d4SAl Viro d_drop(dentry); 1588bc2d3cfSTyler Hicks return rc; 1598bc2d3cfSTyler Hicks } 1608bc2d3cfSTyler Hicks 161237fead6SMichael Halcrow /** 162237fead6SMichael Halcrow * ecryptfs_do_create 163237fead6SMichael Halcrow * @directory_inode: inode of the new file's dentry's parent in ecryptfs 164237fead6SMichael Halcrow * @ecryptfs_dentry: New file's dentry in ecryptfs 165237fead6SMichael Halcrow * @mode: The mode of the new file 166237fead6SMichael Halcrow * 167237fead6SMichael Halcrow * Creates the underlying file and the eCryptfs inode which will link to 168237fead6SMichael Halcrow * it. It will also update the eCryptfs directory inode to mimic the 169237fead6SMichael Halcrow * stat of the lower directory inode. 170237fead6SMichael Halcrow * 171b59db43aSTyler Hicks * Returns the new eCryptfs inode on success; an ERR_PTR on error condition 172237fead6SMichael Halcrow */ 173b59db43aSTyler Hicks static struct inode * 174237fead6SMichael Halcrow ecryptfs_do_create(struct inode *directory_inode, 175175a4eb7SAl Viro struct dentry *ecryptfs_dentry, umode_t mode) 176237fead6SMichael Halcrow { 177237fead6SMichael Halcrow int rc; 178237fead6SMichael Halcrow struct dentry *lower_dentry; 179237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 180b59db43aSTyler Hicks struct inode *inode; 181237fead6SMichael Halcrow 182237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); 183237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 184*6521f891SChristian Brauner rc = vfs_create(&init_user_ns, d_inode(lower_dir_dentry), lower_dentry, 185*6521f891SChristian Brauner mode, true); 1864981e081SMichael Halcrow if (rc) { 187caeeeecfSMichael Halcrow printk(KERN_ERR "%s: Failure to create dentry in lower fs; " 18818d1dbf1SHarvey Harrison "rc = [%d]\n", __func__, rc); 189b59db43aSTyler Hicks inode = ERR_PTR(rc); 190237fead6SMichael Halcrow goto out_lock; 191237fead6SMichael Halcrow } 1922b0143b5SDavid Howells inode = __ecryptfs_get_inode(d_inode(lower_dentry), 1935ccf9203STyler Hicks directory_inode->i_sb); 1948bc2d3cfSTyler Hicks if (IS_ERR(inode)) { 195*6521f891SChristian Brauner vfs_unlink(&init_user_ns, d_inode(lower_dir_dentry), 196*6521f891SChristian Brauner lower_dentry, NULL); 197237fead6SMichael Halcrow goto out_lock; 1988bc2d3cfSTyler Hicks } 1992b0143b5SDavid Howells fsstack_copy_attr_times(directory_inode, d_inode(lower_dir_dentry)); 2002b0143b5SDavid Howells fsstack_copy_inode_size(directory_inode, d_inode(lower_dir_dentry)); 201237fead6SMichael Halcrow out_lock: 202237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 203b59db43aSTyler Hicks return inode; 204237fead6SMichael Halcrow } 205237fead6SMichael Halcrow 206237fead6SMichael Halcrow /** 207237fead6SMichael Halcrow * ecryptfs_initialize_file 208237fead6SMichael Halcrow * 209237fead6SMichael Halcrow * Cause the file to be changed from a basic empty file to an ecryptfs 210237fead6SMichael Halcrow * file with a header and first data page. 211237fead6SMichael Halcrow * 212237fead6SMichael Halcrow * Returns zero on success 213237fead6SMichael Halcrow */ 214e3ccaa97STyler Hicks int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry, 215b59db43aSTyler Hicks struct inode *ecryptfs_inode) 216237fead6SMichael Halcrow { 217d7cdc5feSMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat = 218b59db43aSTyler Hicks &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat; 219237fead6SMichael Halcrow int rc = 0; 220237fead6SMichael Halcrow 221b59db43aSTyler Hicks if (S_ISDIR(ecryptfs_inode->i_mode)) { 222237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); 223e2bd99ecSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 224d7cdc5feSMichael Halcrow goto out; 225237fead6SMichael Halcrow } 226237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); 227b59db43aSTyler Hicks rc = ecryptfs_new_file_context(ecryptfs_inode); 228237fead6SMichael Halcrow if (rc) { 229d7cdc5feSMichael Halcrow ecryptfs_printk(KERN_ERR, "Error creating new file " 230d7cdc5feSMichael Halcrow "context; rc = [%d]\n", rc); 231d7cdc5feSMichael Halcrow goto out; 232237fead6SMichael Halcrow } 233b59db43aSTyler Hicks rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode); 234391b52f9SMichael Halcrow if (rc) { 235391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 236332ab16fSTyler Hicks "the lower file for the dentry with name " 2379e78d14aSDavid Howells "[%pd]; rc = [%d]\n", __func__, 2389e78d14aSDavid Howells ecryptfs_dentry, rc); 239391b52f9SMichael Halcrow goto out; 240391b52f9SMichael Halcrow } 241b59db43aSTyler Hicks rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode); 242332ab16fSTyler Hicks if (rc) 243d7cdc5feSMichael Halcrow printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); 244b59db43aSTyler Hicks ecryptfs_put_lower_file(ecryptfs_inode); 245237fead6SMichael Halcrow out: 246237fead6SMichael Halcrow return rc; 247237fead6SMichael Halcrow } 248237fead6SMichael Halcrow 249237fead6SMichael Halcrow /** 250237fead6SMichael Halcrow * ecryptfs_create 251237fead6SMichael Halcrow * @dir: The inode of the directory in which to create the file. 252237fead6SMichael Halcrow * @dentry: The eCryptfs dentry 253237fead6SMichael Halcrow * @mode: The mode of the new file. 254237fead6SMichael Halcrow * 255237fead6SMichael Halcrow * Creates a new file. 256237fead6SMichael Halcrow * 257237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 258237fead6SMichael Halcrow */ 259237fead6SMichael Halcrow static int 260237fead6SMichael Halcrow ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, 261ebfc3b49SAl Viro umode_t mode, bool excl) 262237fead6SMichael Halcrow { 263b59db43aSTyler Hicks struct inode *ecryptfs_inode; 264237fead6SMichael Halcrow int rc; 265237fead6SMichael Halcrow 266b59db43aSTyler Hicks ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry, 267b59db43aSTyler Hicks mode); 268a1c83681SViresh Kumar if (IS_ERR(ecryptfs_inode)) { 269237fead6SMichael Halcrow ecryptfs_printk(KERN_WARNING, "Failed to create file in" 270237fead6SMichael Halcrow "lower filesystem\n"); 271b59db43aSTyler Hicks rc = PTR_ERR(ecryptfs_inode); 272237fead6SMichael Halcrow goto out; 273237fead6SMichael Halcrow } 274237fead6SMichael Halcrow /* At this point, a file exists on "disk"; we need to make sure 275237fead6SMichael Halcrow * that this on disk file is prepared to be an ecryptfs file */ 276b59db43aSTyler Hicks rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode); 277b59db43aSTyler Hicks if (rc) { 2788bc2d3cfSTyler Hicks ecryptfs_do_unlink(directory_inode, ecryptfs_dentry, 2798bc2d3cfSTyler Hicks ecryptfs_inode); 2800e81ba23SAl Viro iget_failed(ecryptfs_inode); 281b59db43aSTyler Hicks goto out; 282b59db43aSTyler Hicks } 2831e2e547aSAl Viro d_instantiate_new(ecryptfs_dentry, ecryptfs_inode); 284237fead6SMichael Halcrow out: 285237fead6SMichael Halcrow return rc; 286237fead6SMichael Halcrow } 287237fead6SMichael Halcrow 288778aeb42STyler Hicks static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode) 289237fead6SMichael Halcrow { 2902aac0cf8STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 291778aeb42STyler Hicks int rc; 292237fead6SMichael Halcrow 293778aeb42STyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 294391b52f9SMichael Halcrow if (rc) { 295391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 296332ab16fSTyler Hicks "the lower file for the dentry with name " 2979e78d14aSDavid Howells "[%pd]; rc = [%d]\n", __func__, 2989e78d14aSDavid Howells dentry, rc); 299778aeb42STyler Hicks return rc; 300391b52f9SMichael Halcrow } 301778aeb42STyler Hicks 3023b06b3ebSTyler Hicks crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; 3032aac0cf8STyler Hicks /* TODO: lock for crypt_stat comparison */ 3042aac0cf8STyler Hicks if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) 3052aac0cf8STyler Hicks ecryptfs_set_default_sizes(crypt_stat); 306778aeb42STyler Hicks 307778aeb42STyler Hicks rc = ecryptfs_read_and_validate_header_region(inode); 308778aeb42STyler Hicks ecryptfs_put_lower_file(inode); 309237fead6SMichael Halcrow if (rc) { 310778aeb42STyler Hicks rc = ecryptfs_read_and_validate_xattr_region(dentry, inode); 311778aeb42STyler Hicks if (!rc) 312dd2a3b7aSMichael Halcrow crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; 313dd2a3b7aSMichael Halcrow } 314778aeb42STyler Hicks 315778aeb42STyler Hicks /* Must return 0 to allow non-eCryptfs files to be looked up, too */ 316778aeb42STyler Hicks return 0; 317778aeb42STyler Hicks } 318778aeb42STyler Hicks 319778aeb42STyler Hicks /** 320778aeb42STyler Hicks * ecryptfs_lookup_interpose - Dentry interposition for a lookup 321778aeb42STyler Hicks */ 322b1168a92SAl Viro static struct dentry *ecryptfs_lookup_interpose(struct dentry *dentry, 323b1168a92SAl Viro struct dentry *lower_dentry) 324778aeb42STyler Hicks { 325762c6968SAl Viro struct path *path = ecryptfs_dentry_to_lower_path(dentry->d_parent); 326e72b9dd6SAl Viro struct inode *inode, *lower_inode; 327778aeb42STyler Hicks struct ecryptfs_dentry_info *dentry_info; 328778aeb42STyler Hicks int rc = 0; 329778aeb42STyler Hicks 330778aeb42STyler Hicks dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); 331778aeb42STyler Hicks if (!dentry_info) { 332237fead6SMichael Halcrow dput(lower_dentry); 333b1168a92SAl Viro return ERR_PTR(-ENOMEM); 334778aeb42STyler Hicks } 3350b1d9011SAl Viro 336b1168a92SAl Viro fsstack_copy_attr_atime(d_inode(dentry->d_parent), 337762c6968SAl Viro d_inode(path->dentry)); 33884d08fa8SAl Viro BUG_ON(!d_count(lower_dentry)); 3390b1d9011SAl Viro 3400b1d9011SAl Viro ecryptfs_set_dentry_private(dentry, dentry_info); 341762c6968SAl Viro dentry_info->lower_path.mnt = mntget(path->mnt); 34292dd1230SAl Viro dentry_info->lower_path.dentry = lower_dentry; 343778aeb42STyler Hicks 344e72b9dd6SAl Viro /* 345e72b9dd6SAl Viro * negative dentry can go positive under us here - its parent is not 346e72b9dd6SAl Viro * locked. That's OK and that could happen just as we return from 347e72b9dd6SAl Viro * ecryptfs_lookup() anyway. Just need to be careful and fetch 348e72b9dd6SAl Viro * ->d_inode only once - it's not stable here. 349e72b9dd6SAl Viro */ 350e72b9dd6SAl Viro lower_inode = READ_ONCE(lower_dentry->d_inode); 351e72b9dd6SAl Viro 352e72b9dd6SAl Viro if (!lower_inode) { 353778aeb42STyler Hicks /* We want to add because we couldn't find in lower */ 354778aeb42STyler Hicks d_add(dentry, NULL); 355b1168a92SAl Viro return NULL; 356778aeb42STyler Hicks } 357b1168a92SAl Viro inode = __ecryptfs_get_inode(lower_inode, dentry->d_sb); 358778aeb42STyler Hicks if (IS_ERR(inode)) { 359778aeb42STyler Hicks printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n", 360778aeb42STyler Hicks __func__, PTR_ERR(inode)); 361b1168a92SAl Viro return ERR_CAST(inode); 362778aeb42STyler Hicks } 363778aeb42STyler Hicks if (S_ISREG(inode->i_mode)) { 364778aeb42STyler Hicks rc = ecryptfs_i_size_read(dentry, inode); 365778aeb42STyler Hicks if (rc) { 366778aeb42STyler Hicks make_bad_inode(inode); 367b1168a92SAl Viro return ERR_PTR(rc); 368778aeb42STyler Hicks } 369778aeb42STyler Hicks } 370778aeb42STyler Hicks 371778aeb42STyler Hicks if (inode->i_state & I_NEW) 372778aeb42STyler Hicks unlock_new_inode(inode); 373b1168a92SAl Viro return d_splice_alias(inode, dentry); 374addd65adSMichael Halcrow } 375addd65adSMichael Halcrow 376addd65adSMichael Halcrow /** 377addd65adSMichael Halcrow * ecryptfs_lookup 378addd65adSMichael Halcrow * @ecryptfs_dir_inode: The eCryptfs directory inode 379addd65adSMichael Halcrow * @ecryptfs_dentry: The eCryptfs dentry that we are looking up 38089076bc3SAl Viro * @flags: lookup flags 381addd65adSMichael Halcrow * 382addd65adSMichael Halcrow * Find a file on disk. If the file does not exist, then we'll add it to the 383addd65adSMichael Halcrow * dentry cache and continue on to read it from the disk. 384addd65adSMichael Halcrow */ 385addd65adSMichael Halcrow static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, 386addd65adSMichael Halcrow struct dentry *ecryptfs_dentry, 38700cd8dd3SAl Viro unsigned int flags) 388addd65adSMichael Halcrow { 389addd65adSMichael Halcrow char *encrypted_and_encoded_name = NULL; 39088ae4ab9SAl Viro struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 391addd65adSMichael Halcrow struct dentry *lower_dir_dentry, *lower_dentry; 39288ae4ab9SAl Viro const char *name = ecryptfs_dentry->d_name.name; 39388ae4ab9SAl Viro size_t len = ecryptfs_dentry->d_name.len; 394b1168a92SAl Viro struct dentry *res; 395addd65adSMichael Halcrow int rc = 0; 396addd65adSMichael Halcrow 397addd65adSMichael Halcrow lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); 39888ae4ab9SAl Viro 399addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 400addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 401ab13a921SGuenter Roeck if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { 402addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename( 40388ae4ab9SAl Viro &encrypted_and_encoded_name, &len, 40488ae4ab9SAl Viro mount_crypt_stat, name, len); 405addd65adSMichael Halcrow if (rc) { 406addd65adSMichael Halcrow printk(KERN_ERR "%s: Error attempting to encrypt and encode " 407addd65adSMichael Halcrow "filename; rc = [%d]\n", __func__, rc); 408237fead6SMichael Halcrow return ERR_PTR(rc); 409237fead6SMichael Halcrow } 41088ae4ab9SAl Viro name = encrypted_and_encoded_name; 41188ae4ab9SAl Viro } 41288ae4ab9SAl Viro 41388ae4ab9SAl Viro lower_dentry = lookup_one_len_unlocked(name, lower_dir_dentry, len); 414237fead6SMichael Halcrow if (IS_ERR(lower_dentry)) { 415237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 416b1168a92SAl Viro "[%ld] on lower_dentry = [%s]\n", __func__, 417b1168a92SAl Viro PTR_ERR(lower_dentry), 41888ae4ab9SAl Viro name); 419b1168a92SAl Viro res = ERR_CAST(lower_dentry); 42088ae4ab9SAl Viro } else { 421b1168a92SAl Viro res = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry); 42288ae4ab9SAl Viro } 423237fead6SMichael Halcrow kfree(encrypted_and_encoded_name); 424b1168a92SAl Viro return res; 425237fead6SMichael Halcrow } 426237fead6SMichael Halcrow 427237fead6SMichael Halcrow static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, 428237fead6SMichael Halcrow struct dentry *new_dentry) 429237fead6SMichael Halcrow { 430237fead6SMichael Halcrow struct dentry *lower_old_dentry; 431237fead6SMichael Halcrow struct dentry *lower_new_dentry; 432237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 433237fead6SMichael Halcrow u64 file_size_save; 434237fead6SMichael Halcrow int rc; 435237fead6SMichael Halcrow 4362b0143b5SDavid Howells file_size_save = i_size_read(d_inode(old_dentry)); 437237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 438237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 439237fead6SMichael Halcrow dget(lower_old_dentry); 440237fead6SMichael Halcrow dget(lower_new_dentry); 441237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_new_dentry); 442*6521f891SChristian Brauner rc = vfs_link(lower_old_dentry, &init_user_ns, 443*6521f891SChristian Brauner d_inode(lower_dir_dentry), lower_new_dentry, NULL); 4442b0143b5SDavid Howells if (rc || d_really_is_negative(lower_new_dentry)) 445237fead6SMichael Halcrow goto out_lock; 4465ccf9203STyler Hicks rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); 447237fead6SMichael Halcrow if (rc) 448237fead6SMichael Halcrow goto out_lock; 4492b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 4502b0143b5SDavid Howells fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); 4512b0143b5SDavid Howells set_nlink(d_inode(old_dentry), 4522b0143b5SDavid Howells ecryptfs_inode_to_lower(d_inode(old_dentry))->i_nlink); 4532b0143b5SDavid Howells i_size_write(d_inode(new_dentry), file_size_save); 454237fead6SMichael Halcrow out_lock: 455237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 456237fead6SMichael Halcrow dput(lower_new_dentry); 457237fead6SMichael Halcrow dput(lower_old_dentry); 458237fead6SMichael Halcrow return rc; 459237fead6SMichael Halcrow } 460237fead6SMichael Halcrow 461237fead6SMichael Halcrow static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) 462237fead6SMichael Halcrow { 4632b0143b5SDavid Howells return ecryptfs_do_unlink(dir, dentry, d_inode(dentry)); 464237fead6SMichael Halcrow } 465237fead6SMichael Halcrow 466237fead6SMichael Halcrow static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, 467237fead6SMichael Halcrow const char *symname) 468237fead6SMichael Halcrow { 469237fead6SMichael Halcrow int rc; 470237fead6SMichael Halcrow struct dentry *lower_dentry; 471237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 472237fead6SMichael Halcrow char *encoded_symname; 473addd65adSMichael Halcrow size_t encoded_symlen; 474addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 475237fead6SMichael Halcrow 476237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 477237fead6SMichael Halcrow dget(lower_dentry); 478237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 479addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 480addd65adSMichael Halcrow dir->i_sb)->mount_crypt_stat; 481addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, 482addd65adSMichael Halcrow &encoded_symlen, 483addd65adSMichael Halcrow mount_crypt_stat, symname, 484addd65adSMichael Halcrow strlen(symname)); 485addd65adSMichael Halcrow if (rc) 486237fead6SMichael Halcrow goto out_lock; 487*6521f891SChristian Brauner rc = vfs_symlink(&init_user_ns, d_inode(lower_dir_dentry), lower_dentry, 488db2e747bSMiklos Szeredi encoded_symname); 489237fead6SMichael Halcrow kfree(encoded_symname); 4902b0143b5SDavid Howells if (rc || d_really_is_negative(lower_dentry)) 491237fead6SMichael Halcrow goto out_lock; 4925ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 493237fead6SMichael Halcrow if (rc) 494237fead6SMichael Halcrow goto out_lock; 4952b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 4962b0143b5SDavid Howells fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); 497237fead6SMichael Halcrow out_lock: 498237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 499237fead6SMichael Halcrow dput(lower_dentry); 5002b0143b5SDavid Howells if (d_really_is_negative(dentry)) 501237fead6SMichael Halcrow d_drop(dentry); 502237fead6SMichael Halcrow return rc; 503237fead6SMichael Halcrow } 504237fead6SMichael Halcrow 50518bb1db3SAl Viro static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 506237fead6SMichael Halcrow { 507237fead6SMichael Halcrow int rc; 508237fead6SMichael Halcrow struct dentry *lower_dentry; 509237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 510237fead6SMichael Halcrow 511237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 512237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 513*6521f891SChristian Brauner rc = vfs_mkdir(&init_user_ns, d_inode(lower_dir_dentry), lower_dentry, 514*6521f891SChristian Brauner mode); 5152b0143b5SDavid Howells if (rc || d_really_is_negative(lower_dentry)) 516237fead6SMichael Halcrow goto out; 5175ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 518237fead6SMichael Halcrow if (rc) 519237fead6SMichael Halcrow goto out; 5202b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 5212b0143b5SDavid Howells fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); 5222b0143b5SDavid Howells set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink); 523237fead6SMichael Halcrow out: 524237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 5252b0143b5SDavid Howells if (d_really_is_negative(dentry)) 526237fead6SMichael Halcrow d_drop(dentry); 527237fead6SMichael Halcrow return rc; 528237fead6SMichael Halcrow } 529237fead6SMichael Halcrow 530237fead6SMichael Halcrow static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) 531237fead6SMichael Halcrow { 532237fead6SMichael Halcrow struct dentry *lower_dentry; 533237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 534bcf0d9d4SAl Viro struct inode *lower_dir_inode; 53545ec4abaSMichael Halcrow int rc; 536237fead6SMichael Halcrow 537237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 538bcf0d9d4SAl Viro lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent); 539bcf0d9d4SAl Viro lower_dir_inode = d_inode(lower_dir_dentry); 540bcf0d9d4SAl Viro 541bcf0d9d4SAl Viro inode_lock_nested(lower_dir_inode, I_MUTEX_PARENT); 542bcf0d9d4SAl Viro dget(lower_dentry); // don't even try to make the lower negative 543bcf0d9d4SAl Viro if (lower_dentry->d_parent != lower_dir_dentry) 544bcf0d9d4SAl Viro rc = -EINVAL; 545bcf0d9d4SAl Viro else if (d_unhashed(lower_dentry)) 546bcf0d9d4SAl Viro rc = -EINVAL; 547bcf0d9d4SAl Viro else 548*6521f891SChristian Brauner rc = vfs_rmdir(&init_user_ns, lower_dir_inode, lower_dentry); 549bcf0d9d4SAl Viro if (!rc) { 5502b0143b5SDavid Howells clear_nlink(d_inode(dentry)); 551bcf0d9d4SAl Viro fsstack_copy_attr_times(dir, lower_dir_inode); 552bcf0d9d4SAl Viro set_nlink(dir, lower_dir_inode->i_nlink); 553bcf0d9d4SAl Viro } 554bcf0d9d4SAl Viro dput(lower_dentry); 555bcf0d9d4SAl Viro inode_unlock(lower_dir_inode); 556237fead6SMichael Halcrow if (!rc) 557237fead6SMichael Halcrow d_drop(dentry); 558237fead6SMichael Halcrow return rc; 559237fead6SMichael Halcrow } 560237fead6SMichael Halcrow 561237fead6SMichael Halcrow static int 5621a67aafbSAl Viro ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) 563237fead6SMichael Halcrow { 564237fead6SMichael Halcrow int rc; 565237fead6SMichael Halcrow struct dentry *lower_dentry; 566237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 567237fead6SMichael Halcrow 568237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 569237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 570*6521f891SChristian Brauner rc = vfs_mknod(&init_user_ns, d_inode(lower_dir_dentry), lower_dentry, 571*6521f891SChristian Brauner mode, dev); 5722b0143b5SDavid Howells if (rc || d_really_is_negative(lower_dentry)) 573237fead6SMichael Halcrow goto out; 5745ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 575237fead6SMichael Halcrow if (rc) 576237fead6SMichael Halcrow goto out; 5772b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 5782b0143b5SDavid Howells fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); 579237fead6SMichael Halcrow out: 580237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 5812b0143b5SDavid Howells if (d_really_is_negative(dentry)) 582237fead6SMichael Halcrow d_drop(dentry); 583237fead6SMichael Halcrow return rc; 584237fead6SMichael Halcrow } 585237fead6SMichael Halcrow 586237fead6SMichael Halcrow static int 587237fead6SMichael Halcrow ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, 5881cd66c93SMiklos Szeredi struct inode *new_dir, struct dentry *new_dentry, 5891cd66c93SMiklos Szeredi unsigned int flags) 590237fead6SMichael Halcrow { 591237fead6SMichael Halcrow int rc; 592237fead6SMichael Halcrow struct dentry *lower_old_dentry; 593237fead6SMichael Halcrow struct dentry *lower_new_dentry; 594237fead6SMichael Halcrow struct dentry *lower_old_dir_dentry; 595237fead6SMichael Halcrow struct dentry *lower_new_dir_dentry; 596bcf0d9d4SAl Viro struct dentry *trap; 5978335eafcSTyler Hicks struct inode *target_inode; 5989fe61450SChristian Brauner struct renamedata rd = {}; 599237fead6SMichael Halcrow 6001cd66c93SMiklos Szeredi if (flags) 6011cd66c93SMiklos Szeredi return -EINVAL; 6021cd66c93SMiklos Szeredi 603bcf0d9d4SAl Viro lower_old_dir_dentry = ecryptfs_dentry_to_lower(old_dentry->d_parent); 604bcf0d9d4SAl Viro lower_new_dir_dentry = ecryptfs_dentry_to_lower(new_dentry->d_parent); 605bcf0d9d4SAl Viro 606237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 607237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 608bcf0d9d4SAl Viro 6092b0143b5SDavid Howells target_inode = d_inode(new_dentry); 610bcf0d9d4SAl Viro 6110d132f73SErez Zadok trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 612bcf0d9d4SAl Viro dget(lower_new_dentry); 6130d132f73SErez Zadok rc = -EINVAL; 61474dd7c97SAl Viro if (lower_old_dentry->d_parent != lower_old_dir_dentry) 6150d132f73SErez Zadok goto out_lock; 61674dd7c97SAl Viro if (lower_new_dentry->d_parent != lower_new_dir_dentry) 61774dd7c97SAl Viro goto out_lock; 61874dd7c97SAl Viro if (d_unhashed(lower_old_dentry) || d_unhashed(lower_new_dentry)) 61974dd7c97SAl Viro goto out_lock; 62074dd7c97SAl Viro /* source should not be ancestor of target */ 62174dd7c97SAl Viro if (trap == lower_old_dentry) 62274dd7c97SAl Viro goto out_lock; 6230d132f73SErez Zadok /* target should not be ancestor of source */ 6240d132f73SErez Zadok if (trap == lower_new_dentry) { 6250d132f73SErez Zadok rc = -ENOTEMPTY; 6260d132f73SErez Zadok goto out_lock; 6270d132f73SErez Zadok } 6289fe61450SChristian Brauner 629*6521f891SChristian Brauner rd.old_mnt_userns = &init_user_ns; 6309fe61450SChristian Brauner rd.old_dir = d_inode(lower_old_dir_dentry); 6319fe61450SChristian Brauner rd.old_dentry = lower_old_dentry; 632*6521f891SChristian Brauner rd.new_mnt_userns = &init_user_ns; 6339fe61450SChristian Brauner rd.new_dir = d_inode(lower_new_dir_dentry); 6349fe61450SChristian Brauner rd.new_dentry = lower_new_dentry; 6359fe61450SChristian Brauner rc = vfs_rename(&rd); 636237fead6SMichael Halcrow if (rc) 637237fead6SMichael Halcrow goto out_lock; 6388335eafcSTyler Hicks if (target_inode) 6398335eafcSTyler Hicks fsstack_copy_attr_all(target_inode, 6408335eafcSTyler Hicks ecryptfs_inode_to_lower(target_inode)); 6412b0143b5SDavid Howells fsstack_copy_attr_all(new_dir, d_inode(lower_new_dir_dentry)); 642237fead6SMichael Halcrow if (new_dir != old_dir) 6432b0143b5SDavid Howells fsstack_copy_attr_all(old_dir, d_inode(lower_old_dir_dentry)); 644237fead6SMichael Halcrow out_lock: 645237fead6SMichael Halcrow dput(lower_new_dentry); 646bcf0d9d4SAl Viro unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 647237fead6SMichael Halcrow return rc; 648237fead6SMichael Halcrow } 649237fead6SMichael Halcrow 650b22e8fedSAl Viro static char *ecryptfs_readlink_lower(struct dentry *dentry, size_t *bufsiz) 651237fead6SMichael Halcrow { 6526c988f57SMiklos Szeredi DEFINE_DELAYED_CALL(done); 6533a60a168STyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 6546c988f57SMiklos Szeredi const char *link; 655b22e8fedSAl Viro char *buf; 656addd65adSMichael Halcrow int rc; 657237fead6SMichael Halcrow 6586c988f57SMiklos Szeredi link = vfs_get_link(lower_dentry, &done); 6596c988f57SMiklos Szeredi if (IS_ERR(link)) 6606c988f57SMiklos Szeredi return ERR_CAST(link); 6616c988f57SMiklos Szeredi 662b22e8fedSAl Viro rc = ecryptfs_decode_and_decrypt_filename(&buf, bufsiz, dentry->d_sb, 6636c988f57SMiklos Szeredi link, strlen(link)); 6646c988f57SMiklos Szeredi do_delayed_call(&done); 6656c988f57SMiklos Szeredi if (rc) 6666c988f57SMiklos Szeredi return ERR_PTR(rc); 6676c988f57SMiklos Szeredi 6686c988f57SMiklos Szeredi return buf; 6693a60a168STyler Hicks } 6703a60a168STyler Hicks 6716b255391SAl Viro static const char *ecryptfs_get_link(struct dentry *dentry, 672fceef393SAl Viro struct inode *inode, 673fceef393SAl Viro struct delayed_call *done) 674237fead6SMichael Halcrow { 675b22e8fedSAl Viro size_t len; 6766b255391SAl Viro char *buf; 6776b255391SAl Viro 6786b255391SAl Viro if (!dentry) 6796b255391SAl Viro return ERR_PTR(-ECHILD); 6806b255391SAl Viro 6816b255391SAl Viro buf = ecryptfs_readlink_lower(dentry, &len); 682b22e8fedSAl Viro if (IS_ERR(buf)) 683680baacbSAl Viro return buf; 6842b0143b5SDavid Howells fsstack_copy_attr_atime(d_inode(dentry), 6852b0143b5SDavid Howells d_inode(ecryptfs_dentry_to_lower(dentry))); 686408bd629SAl Viro buf[len] = '\0'; 687fceef393SAl Viro set_delayed_call(done, kfree_link, buf); 688fceef393SAl Viro return buf; 689237fead6SMichael Halcrow } 690237fead6SMichael Halcrow 691237fead6SMichael Halcrow /** 692237fead6SMichael Halcrow * upper_size_to_lower_size 693237fead6SMichael Halcrow * @crypt_stat: Crypt_stat associated with file 694237fead6SMichael Halcrow * @upper_size: Size of the upper file 695237fead6SMichael Halcrow * 696cc11beffSMichael Halcrow * Calculate the required size of the lower file based on the 697237fead6SMichael Halcrow * specified size of the upper file. This calculation is based on the 698237fead6SMichael Halcrow * number of headers in the underlying file and the extent size. 699237fead6SMichael Halcrow * 700237fead6SMichael Halcrow * Returns Calculated size of the lower file. 701237fead6SMichael Halcrow */ 702237fead6SMichael Halcrow static loff_t 703237fead6SMichael Halcrow upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, 704237fead6SMichael Halcrow loff_t upper_size) 705237fead6SMichael Halcrow { 706237fead6SMichael Halcrow loff_t lower_size; 707237fead6SMichael Halcrow 708157f1071STyler Hicks lower_size = ecryptfs_lower_header_size(crypt_stat); 709237fead6SMichael Halcrow if (upper_size != 0) { 710237fead6SMichael Halcrow loff_t num_extents; 711237fead6SMichael Halcrow 712237fead6SMichael Halcrow num_extents = upper_size >> crypt_stat->extent_shift; 713237fead6SMichael Halcrow if (upper_size & ~crypt_stat->extent_mask) 714237fead6SMichael Halcrow num_extents++; 715237fead6SMichael Halcrow lower_size += (num_extents * crypt_stat->extent_size); 716237fead6SMichael Halcrow } 717237fead6SMichael Halcrow return lower_size; 718237fead6SMichael Halcrow } 719237fead6SMichael Halcrow 720237fead6SMichael Halcrow /** 7215f3ef64fSTyler Hicks * truncate_upper 722237fead6SMichael Halcrow * @dentry: The ecryptfs layer dentry 7235f3ef64fSTyler Hicks * @ia: Address of the ecryptfs inode's attributes 7245f3ef64fSTyler Hicks * @lower_ia: Address of the lower inode's attributes 725237fead6SMichael Halcrow * 726237fead6SMichael Halcrow * Function to handle truncations modifying the size of the file. Note 727237fead6SMichael Halcrow * that the file sizes are interpolated. When expanding, we are simply 7285f3ef64fSTyler Hicks * writing strings of 0's out. When truncating, we truncate the upper 7295f3ef64fSTyler Hicks * inode and update the lower_ia according to the page index 7305f3ef64fSTyler Hicks * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, 7315f3ef64fSTyler Hicks * the caller must use lower_ia in a call to notify_change() to perform 7325f3ef64fSTyler Hicks * the truncation of the lower inode. 733237fead6SMichael Halcrow * 734237fead6SMichael Halcrow * Returns zero on success; non-zero otherwise 735237fead6SMichael Halcrow */ 7365f3ef64fSTyler Hicks static int truncate_upper(struct dentry *dentry, struct iattr *ia, 7375f3ef64fSTyler Hicks struct iattr *lower_ia) 738237fead6SMichael Halcrow { 739237fead6SMichael Halcrow int rc = 0; 7402b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 741237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 742237fead6SMichael Halcrow loff_t i_size = i_size_read(inode); 743237fead6SMichael Halcrow loff_t lower_size_before_truncate; 744237fead6SMichael Halcrow loff_t lower_size_after_truncate; 745237fead6SMichael Halcrow 7465f3ef64fSTyler Hicks if (unlikely((ia->ia_size == i_size))) { 7475f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 748332ab16fSTyler Hicks return 0; 7495f3ef64fSTyler Hicks } 7503b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 751332ab16fSTyler Hicks if (rc) 752332ab16fSTyler Hicks return rc; 7532b0143b5SDavid Howells crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; 754237fead6SMichael Halcrow /* Switch on growing or shrinking file */ 7555f3ef64fSTyler Hicks if (ia->ia_size > i_size) { 7562ed92554SMichael Halcrow char zero[] = { 0x00 }; 757240e2df5SMichael Halcrow 7585f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 7592ed92554SMichael Halcrow /* Write a single 0 at the last position of the file; 7602ed92554SMichael Halcrow * this triggers code that will fill in 0's throughout 7612ed92554SMichael Halcrow * the intermediate portion of the previous end of the 7622ed92554SMichael Halcrow * file and the new and of the file */ 76348c1e44aSAl Viro rc = ecryptfs_write(inode, zero, 7645f3ef64fSTyler Hicks (ia->ia_size - 1), 1); 7655f3ef64fSTyler Hicks } else { /* ia->ia_size < i_size_read(inode) */ 7665f3ef64fSTyler Hicks /* We're chopping off all the pages down to the page 7675f3ef64fSTyler Hicks * in which ia->ia_size is located. Fill in the end of 768ea1754a0SKirill A. Shutemov * that page from (ia->ia_size & ~PAGE_MASK) to 769ea1754a0SKirill A. Shutemov * PAGE_SIZE with zeros. */ 77009cbfeafSKirill A. Shutemov size_t num_zeros = (PAGE_SIZE 77109cbfeafSKirill A. Shutemov - (ia->ia_size & ~PAGE_MASK)); 7722ed92554SMichael Halcrow 7732c27c65eSChristoph Hellwig if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { 7742c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 7755f3ef64fSTyler Hicks lower_ia->ia_size = ia->ia_size; 7765f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 77748c1e44aSAl Viro goto out; 77813a791b4STyler Hicks } 7792ed92554SMichael Halcrow if (num_zeros) { 7802ed92554SMichael Halcrow char *zeros_virt; 7812ed92554SMichael Halcrow 7822ed92554SMichael Halcrow zeros_virt = kzalloc(num_zeros, GFP_KERNEL); 7832ed92554SMichael Halcrow if (!zeros_virt) { 7842ed92554SMichael Halcrow rc = -ENOMEM; 78548c1e44aSAl Viro goto out; 786240e2df5SMichael Halcrow } 78748c1e44aSAl Viro rc = ecryptfs_write(inode, zeros_virt, 7885f3ef64fSTyler Hicks ia->ia_size, num_zeros); 7892ed92554SMichael Halcrow kfree(zeros_virt); 7905dda6992SMichael Halcrow if (rc) { 791240e2df5SMichael Halcrow printk(KERN_ERR "Error attempting to zero out " 792240e2df5SMichael Halcrow "the remainder of the end page on " 793240e2df5SMichael Halcrow "reducing truncate; rc = [%d]\n", rc); 79448c1e44aSAl Viro goto out; 795240e2df5SMichael Halcrow } 796240e2df5SMichael Halcrow } 7972c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 7980216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 799dd2a3b7aSMichael Halcrow if (rc) { 800dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 801dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 802dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 80348c1e44aSAl Viro goto out; 804dd2a3b7aSMichael Halcrow } 805237fead6SMichael Halcrow /* We are reducing the size of the ecryptfs file, and need to 806237fead6SMichael Halcrow * know if we need to reduce the size of the lower file. */ 807237fead6SMichael Halcrow lower_size_before_truncate = 808237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, i_size); 809237fead6SMichael Halcrow lower_size_after_truncate = 8105f3ef64fSTyler Hicks upper_size_to_lower_size(crypt_stat, ia->ia_size); 8115f3ef64fSTyler Hicks if (lower_size_after_truncate < lower_size_before_truncate) { 8125f3ef64fSTyler Hicks lower_ia->ia_size = lower_size_after_truncate; 8135f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 8145f3ef64fSTyler Hicks } else 8155f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 816237fead6SMichael Halcrow } 817237fead6SMichael Halcrow out: 818332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 819237fead6SMichael Halcrow return rc; 820237fead6SMichael Halcrow } 821237fead6SMichael Halcrow 822a261a039STyler Hicks static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset) 823a261a039STyler Hicks { 824a261a039STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 825a261a039STyler Hicks loff_t lower_oldsize, lower_newsize; 826a261a039STyler Hicks 827a261a039STyler Hicks crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; 828a261a039STyler Hicks lower_oldsize = upper_size_to_lower_size(crypt_stat, 829a261a039STyler Hicks i_size_read(inode)); 830a261a039STyler Hicks lower_newsize = upper_size_to_lower_size(crypt_stat, offset); 831a261a039STyler Hicks if (lower_newsize > lower_oldsize) { 832a261a039STyler Hicks /* 833a261a039STyler Hicks * The eCryptfs inode and the new *lower* size are mixed here 834a261a039STyler Hicks * because we may not have the lower i_mutex held and/or it may 835a261a039STyler Hicks * not be appropriate to call inode_newsize_ok() with inodes 836a261a039STyler Hicks * from other filesystems. 837a261a039STyler Hicks */ 838a261a039STyler Hicks return inode_newsize_ok(inode, lower_newsize); 839a261a039STyler Hicks } 840a261a039STyler Hicks 841a261a039STyler Hicks return 0; 842a261a039STyler Hicks } 843a261a039STyler Hicks 8445f3ef64fSTyler Hicks /** 8455f3ef64fSTyler Hicks * ecryptfs_truncate 8465f3ef64fSTyler Hicks * @dentry: The ecryptfs layer dentry 8475f3ef64fSTyler Hicks * @new_length: The length to expand the file to 8485f3ef64fSTyler Hicks * 8495f3ef64fSTyler Hicks * Simple function that handles the truncation of an eCryptfs inode and 8505f3ef64fSTyler Hicks * its corresponding lower inode. 8515f3ef64fSTyler Hicks * 8525f3ef64fSTyler Hicks * Returns zero on success; non-zero otherwise 8535f3ef64fSTyler Hicks */ 8545f3ef64fSTyler Hicks int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) 8555f3ef64fSTyler Hicks { 8565f3ef64fSTyler Hicks struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; 8575f3ef64fSTyler Hicks struct iattr lower_ia = { .ia_valid = 0 }; 8585f3ef64fSTyler Hicks int rc; 8595f3ef64fSTyler Hicks 8602b0143b5SDavid Howells rc = ecryptfs_inode_newsize_ok(d_inode(dentry), new_length); 861a261a039STyler Hicks if (rc) 862a261a039STyler Hicks return rc; 863a261a039STyler Hicks 8645f3ef64fSTyler Hicks rc = truncate_upper(dentry, &ia, &lower_ia); 8655f3ef64fSTyler Hicks if (!rc && lower_ia.ia_valid & ATTR_SIZE) { 8665f3ef64fSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 8675f3ef64fSTyler Hicks 8685955102cSAl Viro inode_lock(d_inode(lower_dentry)); 8692f221d6fSChristian Brauner rc = notify_change(&init_user_ns, lower_dentry, 8702f221d6fSChristian Brauner &lower_ia, NULL); 8715955102cSAl Viro inode_unlock(d_inode(lower_dentry)); 8725f3ef64fSTyler Hicks } 8735f3ef64fSTyler Hicks return rc; 8745f3ef64fSTyler Hicks } 8755f3ef64fSTyler Hicks 876237fead6SMichael Halcrow static int 87710556cb2SAl Viro ecryptfs_permission(struct inode *inode, int mask) 878237fead6SMichael Halcrow { 87947291baaSChristian Brauner return inode_permission(&init_user_ns, 88047291baaSChristian Brauner ecryptfs_inode_to_lower(inode), mask); 881237fead6SMichael Halcrow } 882237fead6SMichael Halcrow 883237fead6SMichael Halcrow /** 884237fead6SMichael Halcrow * ecryptfs_setattr 885237fead6SMichael Halcrow * @dentry: dentry handle to the inode to modify 886237fead6SMichael Halcrow * @ia: Structure with flags of what to change and values 887237fead6SMichael Halcrow * 888237fead6SMichael Halcrow * Updates the metadata of an inode. If the update is to the size 889237fead6SMichael Halcrow * i.e. truncation, then ecryptfs_truncate will handle the size modification 890237fead6SMichael Halcrow * of both the ecryptfs inode and the lower inode. 891237fead6SMichael Halcrow * 892237fead6SMichael Halcrow * All other metadata changes will be passed right to the lower filesystem, 893237fead6SMichael Halcrow * and we will just update our inode to look like the lower. 894237fead6SMichael Halcrow */ 895237fead6SMichael Halcrow static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) 896237fead6SMichael Halcrow { 897237fead6SMichael Halcrow int rc = 0; 898237fead6SMichael Halcrow struct dentry *lower_dentry; 8995f3ef64fSTyler Hicks struct iattr lower_ia; 900237fead6SMichael Halcrow struct inode *inode; 901237fead6SMichael Halcrow struct inode *lower_inode; 902237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 903237fead6SMichael Halcrow 9042b0143b5SDavid Howells crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; 905e81f3340SHerbert Xu if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) { 906e81f3340SHerbert Xu rc = ecryptfs_init_crypt_stat(crypt_stat); 907e81f3340SHerbert Xu if (rc) 908e81f3340SHerbert Xu return rc; 909e81f3340SHerbert Xu } 9102b0143b5SDavid Howells inode = d_inode(dentry); 911237fead6SMichael Halcrow lower_inode = ecryptfs_inode_to_lower(inode); 912e10f281bSMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 913e10f281bSMichael Halcrow mutex_lock(&crypt_stat->cs_mutex); 914e36cb0b8SDavid Howells if (d_is_dir(dentry)) 915e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 916e36cb0b8SDavid Howells else if (d_is_reg(dentry) 91764ee4808SMichael Halcrow && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) 91864ee4808SMichael Halcrow || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { 919e10f281bSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 920e10f281bSMichael Halcrow 921e10f281bSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 922e10f281bSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 9233b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 924332ab16fSTyler Hicks if (rc) { 925332ab16fSTyler Hicks mutex_unlock(&crypt_stat->cs_mutex); 926332ab16fSTyler Hicks goto out; 927332ab16fSTyler Hicks } 928d7cdc5feSMichael Halcrow rc = ecryptfs_read_metadata(dentry); 929332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 9305dda6992SMichael Halcrow if (rc) { 931e10f281bSMichael Halcrow if (!(mount_crypt_stat->flags 932e10f281bSMichael Halcrow & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { 933e10f281bSMichael Halcrow rc = -EIO; 93425bd8174SMichael Halcrow printk(KERN_WARNING "Either the lower file " 935e10f281bSMichael Halcrow "is not in a valid eCryptfs format, " 93625bd8174SMichael Halcrow "or the key could not be retrieved. " 93725bd8174SMichael Halcrow "Plaintext passthrough mode is not " 938e10f281bSMichael Halcrow "enabled; returning -EIO\n"); 939e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 940e10f281bSMichael Halcrow goto out; 941e10f281bSMichael Halcrow } 942e10f281bSMichael Halcrow rc = 0; 9433aeb86eaSTyler Hicks crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED 9443aeb86eaSTyler Hicks | ECRYPTFS_ENCRYPTED); 945e10f281bSMichael Halcrow } 946e10f281bSMichael Halcrow } 947e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 948a261a039STyler Hicks 9492f221d6fSChristian Brauner rc = setattr_prepare(&init_user_ns, dentry, ia); 950a261a039STyler Hicks if (rc) 951a261a039STyler Hicks goto out; 952a261a039STyler Hicks if (ia->ia_valid & ATTR_SIZE) { 953a261a039STyler Hicks rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size); 954a261a039STyler Hicks if (rc) 955a261a039STyler Hicks goto out; 956a261a039STyler Hicks } 957a261a039STyler Hicks 9585f3ef64fSTyler Hicks memcpy(&lower_ia, ia, sizeof(lower_ia)); 9595f3ef64fSTyler Hicks if (ia->ia_valid & ATTR_FILE) 9605f3ef64fSTyler Hicks lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); 961237fead6SMichael Halcrow if (ia->ia_valid & ATTR_SIZE) { 9625f3ef64fSTyler Hicks rc = truncate_upper(dentry, ia, &lower_ia); 963237fead6SMichael Halcrow if (rc < 0) 964237fead6SMichael Halcrow goto out; 965237fead6SMichael Halcrow } 9661ac564ecSJeff Layton 9671ac564ecSJeff Layton /* 9681ac564ecSJeff Layton * mode change is for clearing setuid/setgid bits. Allow lower fs 9691ac564ecSJeff Layton * to interpret this in its own way. 9701ac564ecSJeff Layton */ 9715f3ef64fSTyler Hicks if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 9725f3ef64fSTyler Hicks lower_ia.ia_valid &= ~ATTR_MODE; 9731ac564ecSJeff Layton 9745955102cSAl Viro inode_lock(d_inode(lower_dentry)); 9752f221d6fSChristian Brauner rc = notify_change(&init_user_ns, lower_dentry, &lower_ia, NULL); 9765955102cSAl Viro inode_unlock(d_inode(lower_dentry)); 977237fead6SMichael Halcrow out: 9789afa2fb6SErez Zadok fsstack_copy_attr_all(inode, lower_inode); 979237fead6SMichael Halcrow return rc; 980237fead6SMichael Halcrow } 981237fead6SMichael Halcrow 982a528d35eSDavid Howells static int ecryptfs_getattr_link(const struct path *path, struct kstat *stat, 983a528d35eSDavid Howells u32 request_mask, unsigned int flags) 9843a60a168STyler Hicks { 985a528d35eSDavid Howells struct dentry *dentry = path->dentry; 9863a60a168STyler Hicks struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 9873a60a168STyler Hicks int rc = 0; 9883a60a168STyler Hicks 9893a60a168STyler Hicks mount_crypt_stat = &ecryptfs_superblock_to_private( 9903a60a168STyler Hicks dentry->d_sb)->mount_crypt_stat; 9910d56a451SChristian Brauner generic_fillattr(&init_user_ns, d_inode(dentry), stat); 9923a60a168STyler Hicks if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { 9933a60a168STyler Hicks char *target; 9943a60a168STyler Hicks size_t targetsiz; 9953a60a168STyler Hicks 996b22e8fedSAl Viro target = ecryptfs_readlink_lower(dentry, &targetsiz); 997b22e8fedSAl Viro if (!IS_ERR(target)) { 9983a60a168STyler Hicks kfree(target); 9993a60a168STyler Hicks stat->size = targetsiz; 1000b22e8fedSAl Viro } else { 1001b22e8fedSAl Viro rc = PTR_ERR(target); 10023a60a168STyler Hicks } 10033a60a168STyler Hicks } 10043a60a168STyler Hicks return rc; 10053a60a168STyler Hicks } 10063a60a168STyler Hicks 1007a528d35eSDavid Howells static int ecryptfs_getattr(const struct path *path, struct kstat *stat, 1008a528d35eSDavid Howells u32 request_mask, unsigned int flags) 1009f8f484d1STyler Hicks { 1010a528d35eSDavid Howells struct dentry *dentry = path->dentry; 1011f8f484d1STyler Hicks struct kstat lower_stat; 1012f8f484d1STyler Hicks int rc; 1013f8f484d1STyler Hicks 1014a528d35eSDavid Howells rc = vfs_getattr(ecryptfs_dentry_to_lower_path(dentry), &lower_stat, 1015a528d35eSDavid Howells request_mask, flags); 1016f8f484d1STyler Hicks if (!rc) { 10172b0143b5SDavid Howells fsstack_copy_attr_all(d_inode(dentry), 10182b0143b5SDavid Howells ecryptfs_inode_to_lower(d_inode(dentry))); 10190d56a451SChristian Brauner generic_fillattr(&init_user_ns, d_inode(dentry), stat); 1020f8f484d1STyler Hicks stat->blocks = lower_stat.blocks; 1021f8f484d1STyler Hicks } 1022f8f484d1STyler Hicks return rc; 1023f8f484d1STyler Hicks } 1024f8f484d1STyler Hicks 1025dd2a3b7aSMichael Halcrow int 10263767e255SAl Viro ecryptfs_setxattr(struct dentry *dentry, struct inode *inode, 10273767e255SAl Viro const char *name, const void *value, 1028237fead6SMichael Halcrow size_t size, int flags) 1029237fead6SMichael Halcrow { 10305d6c3191SAndreas Gruenbacher int rc; 1031237fead6SMichael Halcrow struct dentry *lower_dentry; 1032237fead6SMichael Halcrow 1033237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 10345d6c3191SAndreas Gruenbacher if (!(d_inode(lower_dentry)->i_opflags & IOP_XATTR)) { 1035cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1036237fead6SMichael Halcrow goto out; 1037237fead6SMichael Halcrow } 1038c7c7a1a1STycho Andersen rc = vfs_setxattr(&init_user_ns, lower_dentry, name, value, size, 1039c7c7a1a1STycho Andersen flags); 10403767e255SAl Viro if (!rc && inode) 10413767e255SAl Viro fsstack_copy_attr_all(inode, d_inode(lower_dentry)); 1042237fead6SMichael Halcrow out: 1043237fead6SMichael Halcrow return rc; 1044237fead6SMichael Halcrow } 1045237fead6SMichael Halcrow 1046dd2a3b7aSMichael Halcrow ssize_t 1047ce23e640SAl Viro ecryptfs_getxattr_lower(struct dentry *lower_dentry, struct inode *lower_inode, 1048ce23e640SAl Viro const char *name, void *value, size_t size) 1049d7cdc5feSMichael Halcrow { 10505d6c3191SAndreas Gruenbacher int rc; 1051d7cdc5feSMichael Halcrow 10525d6c3191SAndreas Gruenbacher if (!(lower_inode->i_opflags & IOP_XATTR)) { 1053cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1054d7cdc5feSMichael Halcrow goto out; 1055d7cdc5feSMichael Halcrow } 1056ce23e640SAl Viro inode_lock(lower_inode); 10575d6c3191SAndreas Gruenbacher rc = __vfs_getxattr(lower_dentry, lower_inode, name, value, size); 1058ce23e640SAl Viro inode_unlock(lower_inode); 1059d7cdc5feSMichael Halcrow out: 1060d7cdc5feSMichael Halcrow return rc; 1061d7cdc5feSMichael Halcrow } 1062d7cdc5feSMichael Halcrow 10637896b631SAdrian Bunk static ssize_t 1064ce23e640SAl Viro ecryptfs_getxattr(struct dentry *dentry, struct inode *inode, 1065ce23e640SAl Viro const char *name, void *value, size_t size) 1066237fead6SMichael Halcrow { 1067ce23e640SAl Viro return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), 1068ce23e640SAl Viro ecryptfs_inode_to_lower(inode), 1069ce23e640SAl Viro name, value, size); 1070237fead6SMichael Halcrow } 1071237fead6SMichael Halcrow 1072237fead6SMichael Halcrow static ssize_t 1073237fead6SMichael Halcrow ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) 1074237fead6SMichael Halcrow { 1075237fead6SMichael Halcrow int rc = 0; 1076237fead6SMichael Halcrow struct dentry *lower_dentry; 1077237fead6SMichael Halcrow 1078237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 10792b0143b5SDavid Howells if (!d_inode(lower_dentry)->i_op->listxattr) { 1080cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1081237fead6SMichael Halcrow goto out; 1082237fead6SMichael Halcrow } 10835955102cSAl Viro inode_lock(d_inode(lower_dentry)); 10842b0143b5SDavid Howells rc = d_inode(lower_dentry)->i_op->listxattr(lower_dentry, list, size); 10855955102cSAl Viro inode_unlock(d_inode(lower_dentry)); 1086237fead6SMichael Halcrow out: 1087237fead6SMichael Halcrow return rc; 1088237fead6SMichael Halcrow } 1089237fead6SMichael Halcrow 10904b899da5SAndreas Gruenbacher static int ecryptfs_removexattr(struct dentry *dentry, struct inode *inode, 10914b899da5SAndreas Gruenbacher const char *name) 1092237fead6SMichael Halcrow { 10935d6c3191SAndreas Gruenbacher int rc; 1094237fead6SMichael Halcrow struct dentry *lower_dentry; 10954b899da5SAndreas Gruenbacher struct inode *lower_inode; 1096237fead6SMichael Halcrow 1097237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 10984b899da5SAndreas Gruenbacher lower_inode = ecryptfs_inode_to_lower(inode); 10995d6c3191SAndreas Gruenbacher if (!(lower_inode->i_opflags & IOP_XATTR)) { 1100cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1101237fead6SMichael Halcrow goto out; 1102237fead6SMichael Halcrow } 11034b899da5SAndreas Gruenbacher inode_lock(lower_inode); 1104c7c7a1a1STycho Andersen rc = __vfs_removexattr(&init_user_ns, lower_dentry, name); 11054b899da5SAndreas Gruenbacher inode_unlock(lower_inode); 1106237fead6SMichael Halcrow out: 1107237fead6SMichael Halcrow return rc; 1108237fead6SMichael Halcrow } 1109237fead6SMichael Halcrow 1110754661f1SArjan van de Ven const struct inode_operations ecryptfs_symlink_iops = { 11116b255391SAl Viro .get_link = ecryptfs_get_link, 1112237fead6SMichael Halcrow .permission = ecryptfs_permission, 1113237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 11143a60a168STyler Hicks .getattr = ecryptfs_getattr_link, 1115237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1116237fead6SMichael Halcrow }; 1117237fead6SMichael Halcrow 1118754661f1SArjan van de Ven const struct inode_operations ecryptfs_dir_iops = { 1119237fead6SMichael Halcrow .create = ecryptfs_create, 1120237fead6SMichael Halcrow .lookup = ecryptfs_lookup, 1121237fead6SMichael Halcrow .link = ecryptfs_link, 1122237fead6SMichael Halcrow .unlink = ecryptfs_unlink, 1123237fead6SMichael Halcrow .symlink = ecryptfs_symlink, 1124237fead6SMichael Halcrow .mkdir = ecryptfs_mkdir, 1125237fead6SMichael Halcrow .rmdir = ecryptfs_rmdir, 1126237fead6SMichael Halcrow .mknod = ecryptfs_mknod, 1127237fead6SMichael Halcrow .rename = ecryptfs_rename, 1128237fead6SMichael Halcrow .permission = ecryptfs_permission, 1129237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1130237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1131237fead6SMichael Halcrow }; 1132237fead6SMichael Halcrow 1133754661f1SArjan van de Ven const struct inode_operations ecryptfs_main_iops = { 1134237fead6SMichael Halcrow .permission = ecryptfs_permission, 1135237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1136f8f484d1STyler Hicks .getattr = ecryptfs_getattr, 1137237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 11384b899da5SAndreas Gruenbacher }; 11394b899da5SAndreas Gruenbacher 11404b899da5SAndreas Gruenbacher static int ecryptfs_xattr_get(const struct xattr_handler *handler, 11414b899da5SAndreas Gruenbacher struct dentry *dentry, struct inode *inode, 11424b899da5SAndreas Gruenbacher const char *name, void *buffer, size_t size) 11434b899da5SAndreas Gruenbacher { 11444b899da5SAndreas Gruenbacher return ecryptfs_getxattr(dentry, inode, name, buffer, size); 11454b899da5SAndreas Gruenbacher } 11464b899da5SAndreas Gruenbacher 11474b899da5SAndreas Gruenbacher static int ecryptfs_xattr_set(const struct xattr_handler *handler, 1148e65ce2a5SChristian Brauner struct user_namespace *mnt_userns, 11494b899da5SAndreas Gruenbacher struct dentry *dentry, struct inode *inode, 11504b899da5SAndreas Gruenbacher const char *name, const void *value, size_t size, 11514b899da5SAndreas Gruenbacher int flags) 11524b899da5SAndreas Gruenbacher { 11534b899da5SAndreas Gruenbacher if (value) 11544b899da5SAndreas Gruenbacher return ecryptfs_setxattr(dentry, inode, name, value, size, flags); 11554b899da5SAndreas Gruenbacher else { 11564b899da5SAndreas Gruenbacher BUG_ON(flags != XATTR_REPLACE); 11574b899da5SAndreas Gruenbacher return ecryptfs_removexattr(dentry, inode, name); 11584b899da5SAndreas Gruenbacher } 11594b899da5SAndreas Gruenbacher } 11604b899da5SAndreas Gruenbacher 1161c036061bSYueHaibing static const struct xattr_handler ecryptfs_xattr_handler = { 11624b899da5SAndreas Gruenbacher .prefix = "", /* match anything */ 11634b899da5SAndreas Gruenbacher .get = ecryptfs_xattr_get, 11644b899da5SAndreas Gruenbacher .set = ecryptfs_xattr_set, 11654b899da5SAndreas Gruenbacher }; 11664b899da5SAndreas Gruenbacher 11674b899da5SAndreas Gruenbacher const struct xattr_handler *ecryptfs_xattr_handlers[] = { 11684b899da5SAndreas Gruenbacher &ecryptfs_xattr_handler, 11694b899da5SAndreas Gruenbacher NULL 1170237fead6SMichael Halcrow }; 1171