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> 21*97e2dee9SMiklos Szeredi #include <linux/fileattr.h> 220a688ad7SHarvey Harrison #include <asm/unaligned.h> 23237fead6SMichael Halcrow #include "ecryptfs_kernel.h" 24237fead6SMichael Halcrow 25237fead6SMichael Halcrow static struct dentry *lock_parent(struct dentry *dentry) 26237fead6SMichael Halcrow { 27237fead6SMichael Halcrow struct dentry *dir; 28237fead6SMichael Halcrow 298dc4e373SMiklos Szeredi dir = dget_parent(dentry); 305955102cSAl Viro inode_lock_nested(d_inode(dir), I_MUTEX_PARENT); 31237fead6SMichael Halcrow return dir; 32237fead6SMichael Halcrow } 33237fead6SMichael Halcrow 34237fead6SMichael Halcrow static void unlock_dir(struct dentry *dir) 35237fead6SMichael Halcrow { 365955102cSAl Viro inode_unlock(d_inode(dir)); 37237fead6SMichael Halcrow dput(dir); 38237fead6SMichael Halcrow } 39237fead6SMichael Halcrow 40c4f79073STyler Hicks static int ecryptfs_inode_test(struct inode *inode, void *lower_inode) 41c4f79073STyler Hicks { 42c4cf3ba4SHimangi Saraogi return ecryptfs_inode_to_lower(inode) == lower_inode; 43c4f79073STyler Hicks } 44c4f79073STyler Hicks 455ccf9203STyler Hicks static int ecryptfs_inode_set(struct inode *inode, void *opaque) 46c4f79073STyler Hicks { 475ccf9203STyler Hicks struct inode *lower_inode = opaque; 485ccf9203STyler Hicks 495ccf9203STyler Hicks ecryptfs_set_inode_lower(inode, lower_inode); 505ccf9203STyler Hicks fsstack_copy_attr_all(inode, lower_inode); 515ccf9203STyler Hicks /* i_size will be overwritten for encrypted regular files */ 525ccf9203STyler Hicks fsstack_copy_inode_size(inode, lower_inode); 535ccf9203STyler Hicks inode->i_ino = lower_inode->i_ino; 54c4f79073STyler Hicks inode->i_mapping->a_ops = &ecryptfs_aops; 555ccf9203STyler Hicks 565ccf9203STyler Hicks if (S_ISLNK(inode->i_mode)) 575ccf9203STyler Hicks inode->i_op = &ecryptfs_symlink_iops; 585ccf9203STyler Hicks else if (S_ISDIR(inode->i_mode)) 595ccf9203STyler Hicks inode->i_op = &ecryptfs_dir_iops; 605ccf9203STyler Hicks else 615ccf9203STyler Hicks inode->i_op = &ecryptfs_main_iops; 625ccf9203STyler Hicks 635ccf9203STyler Hicks if (S_ISDIR(inode->i_mode)) 645ccf9203STyler Hicks inode->i_fop = &ecryptfs_dir_fops; 655ccf9203STyler Hicks else if (special_file(inode->i_mode)) 665ccf9203STyler Hicks init_special_inode(inode, inode->i_mode, inode->i_rdev); 675ccf9203STyler Hicks else 685ccf9203STyler Hicks inode->i_fop = &ecryptfs_main_fops; 695ccf9203STyler Hicks 70c4f79073STyler Hicks return 0; 71c4f79073STyler Hicks } 72c4f79073STyler Hicks 735ccf9203STyler Hicks static struct inode *__ecryptfs_get_inode(struct inode *lower_inode, 745ccf9203STyler Hicks struct super_block *sb) 755ccf9203STyler Hicks { 765ccf9203STyler Hicks struct inode *inode; 775ccf9203STyler Hicks 785ccf9203STyler Hicks if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) 795ccf9203STyler Hicks return ERR_PTR(-EXDEV); 805ccf9203STyler Hicks if (!igrab(lower_inode)) 815ccf9203STyler Hicks return ERR_PTR(-ESTALE); 825ccf9203STyler Hicks inode = iget5_locked(sb, (unsigned long)lower_inode, 835ccf9203STyler Hicks ecryptfs_inode_test, ecryptfs_inode_set, 845ccf9203STyler Hicks lower_inode); 855ccf9203STyler Hicks if (!inode) { 865ccf9203STyler Hicks iput(lower_inode); 875ccf9203STyler Hicks return ERR_PTR(-EACCES); 885ccf9203STyler Hicks } 895ccf9203STyler Hicks if (!(inode->i_state & I_NEW)) 905ccf9203STyler Hicks iput(lower_inode); 915ccf9203STyler Hicks 925ccf9203STyler Hicks return inode; 935ccf9203STyler Hicks } 945ccf9203STyler Hicks 95c4f79073STyler Hicks struct inode *ecryptfs_get_inode(struct inode *lower_inode, 96c4f79073STyler Hicks struct super_block *sb) 97c4f79073STyler Hicks { 985ccf9203STyler Hicks struct inode *inode = __ecryptfs_get_inode(lower_inode, sb); 99c4f79073STyler Hicks 1005ccf9203STyler Hicks if (!IS_ERR(inode) && (inode->i_state & I_NEW)) 101c4f79073STyler Hicks unlock_new_inode(inode); 1025ccf9203STyler Hicks 103c4f79073STyler Hicks return inode; 104c4f79073STyler Hicks } 105c4f79073STyler Hicks 106c4f79073STyler Hicks /** 107c4f79073STyler Hicks * ecryptfs_interpose 108c4f79073STyler Hicks * @lower_dentry: Existing dentry in the lower filesystem 109c4f79073STyler Hicks * @dentry: ecryptfs' dentry 110c4f79073STyler Hicks * @sb: ecryptfs's super_block 111c4f79073STyler Hicks * 112c4f79073STyler Hicks * Interposes upper and lower dentries. 113c4f79073STyler Hicks * 114c4f79073STyler Hicks * Returns zero on success; non-zero otherwise 115c4f79073STyler Hicks */ 116c4f79073STyler Hicks static int ecryptfs_interpose(struct dentry *lower_dentry, 1175ccf9203STyler Hicks struct dentry *dentry, struct super_block *sb) 118c4f79073STyler Hicks { 1192b0143b5SDavid Howells struct inode *inode = ecryptfs_get_inode(d_inode(lower_dentry), sb); 1205ccf9203STyler Hicks 121c4f79073STyler Hicks if (IS_ERR(inode)) 122c4f79073STyler Hicks return PTR_ERR(inode); 123c4f79073STyler Hicks d_instantiate(dentry, inode); 1245ccf9203STyler Hicks 125c4f79073STyler Hicks return 0; 126c4f79073STyler Hicks } 127c4f79073STyler Hicks 1288bc2d3cfSTyler Hicks static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry, 1298bc2d3cfSTyler Hicks struct inode *inode) 1308bc2d3cfSTyler Hicks { 1318bc2d3cfSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 1328bc2d3cfSTyler Hicks struct dentry *lower_dir_dentry; 133bcf0d9d4SAl Viro struct inode *lower_dir_inode; 1348bc2d3cfSTyler Hicks int rc; 1358bc2d3cfSTyler Hicks 136bcf0d9d4SAl Viro lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent); 137bcf0d9d4SAl Viro lower_dir_inode = d_inode(lower_dir_dentry); 138bcf0d9d4SAl Viro inode_lock_nested(lower_dir_inode, I_MUTEX_PARENT); 139bcf0d9d4SAl Viro dget(lower_dentry); // don't even try to make the lower negative 140bcf0d9d4SAl Viro if (lower_dentry->d_parent != lower_dir_dentry) 141bcf0d9d4SAl Viro rc = -EINVAL; 142bcf0d9d4SAl Viro else if (d_unhashed(lower_dentry)) 143bcf0d9d4SAl Viro rc = -EINVAL; 144bcf0d9d4SAl Viro else 1456521f891SChristian Brauner rc = vfs_unlink(&init_user_ns, lower_dir_inode, lower_dentry, 1466521f891SChristian Brauner NULL); 1478bc2d3cfSTyler Hicks if (rc) { 1488bc2d3cfSTyler Hicks printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); 1498bc2d3cfSTyler Hicks goto out_unlock; 1508bc2d3cfSTyler Hicks } 1518bc2d3cfSTyler Hicks fsstack_copy_attr_times(dir, lower_dir_inode); 1528bc2d3cfSTyler Hicks set_nlink(inode, ecryptfs_inode_to_lower(inode)->i_nlink); 1538bc2d3cfSTyler Hicks inode->i_ctime = dir->i_ctime; 1548bc2d3cfSTyler Hicks out_unlock: 1558bc2d3cfSTyler Hicks dput(lower_dentry); 156bcf0d9d4SAl Viro inode_unlock(lower_dir_inode); 157bcf0d9d4SAl Viro if (!rc) 158bcf0d9d4SAl Viro d_drop(dentry); 1598bc2d3cfSTyler Hicks return rc; 1608bc2d3cfSTyler Hicks } 1618bc2d3cfSTyler Hicks 162237fead6SMichael Halcrow /** 163237fead6SMichael Halcrow * ecryptfs_do_create 164237fead6SMichael Halcrow * @directory_inode: inode of the new file's dentry's parent in ecryptfs 165237fead6SMichael Halcrow * @ecryptfs_dentry: New file's dentry in ecryptfs 166237fead6SMichael Halcrow * @mode: The mode of the new file 167237fead6SMichael Halcrow * 168237fead6SMichael Halcrow * Creates the underlying file and the eCryptfs inode which will link to 169237fead6SMichael Halcrow * it. It will also update the eCryptfs directory inode to mimic the 170237fead6SMichael Halcrow * stat of the lower directory inode. 171237fead6SMichael Halcrow * 172b59db43aSTyler Hicks * Returns the new eCryptfs inode on success; an ERR_PTR on error condition 173237fead6SMichael Halcrow */ 174b59db43aSTyler Hicks static struct inode * 175237fead6SMichael Halcrow ecryptfs_do_create(struct inode *directory_inode, 176175a4eb7SAl Viro struct dentry *ecryptfs_dentry, umode_t mode) 177237fead6SMichael Halcrow { 178237fead6SMichael Halcrow int rc; 179237fead6SMichael Halcrow struct dentry *lower_dentry; 180237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 181b59db43aSTyler Hicks struct inode *inode; 182237fead6SMichael Halcrow 183237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); 184237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 1856521f891SChristian Brauner rc = vfs_create(&init_user_ns, d_inode(lower_dir_dentry), lower_dentry, 1866521f891SChristian Brauner mode, true); 1874981e081SMichael Halcrow if (rc) { 188caeeeecfSMichael Halcrow printk(KERN_ERR "%s: Failure to create dentry in lower fs; " 18918d1dbf1SHarvey Harrison "rc = [%d]\n", __func__, rc); 190b59db43aSTyler Hicks inode = ERR_PTR(rc); 191237fead6SMichael Halcrow goto out_lock; 192237fead6SMichael Halcrow } 1932b0143b5SDavid Howells inode = __ecryptfs_get_inode(d_inode(lower_dentry), 1945ccf9203STyler Hicks directory_inode->i_sb); 1958bc2d3cfSTyler Hicks if (IS_ERR(inode)) { 1966521f891SChristian Brauner vfs_unlink(&init_user_ns, d_inode(lower_dir_dentry), 1976521f891SChristian Brauner lower_dentry, NULL); 198237fead6SMichael Halcrow goto out_lock; 1998bc2d3cfSTyler Hicks } 2002b0143b5SDavid Howells fsstack_copy_attr_times(directory_inode, d_inode(lower_dir_dentry)); 2012b0143b5SDavid Howells fsstack_copy_inode_size(directory_inode, d_inode(lower_dir_dentry)); 202237fead6SMichael Halcrow out_lock: 203237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 204b59db43aSTyler Hicks return inode; 205237fead6SMichael Halcrow } 206237fead6SMichael Halcrow 207237fead6SMichael Halcrow /** 208237fead6SMichael Halcrow * ecryptfs_initialize_file 209237fead6SMichael Halcrow * 210237fead6SMichael Halcrow * Cause the file to be changed from a basic empty file to an ecryptfs 211237fead6SMichael Halcrow * file with a header and first data page. 212237fead6SMichael Halcrow * 213237fead6SMichael Halcrow * Returns zero on success 214237fead6SMichael Halcrow */ 215e3ccaa97STyler Hicks int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry, 216b59db43aSTyler Hicks struct inode *ecryptfs_inode) 217237fead6SMichael Halcrow { 218d7cdc5feSMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat = 219b59db43aSTyler Hicks &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat; 220237fead6SMichael Halcrow int rc = 0; 221237fead6SMichael Halcrow 222b59db43aSTyler Hicks if (S_ISDIR(ecryptfs_inode->i_mode)) { 223237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); 224e2bd99ecSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 225d7cdc5feSMichael Halcrow goto out; 226237fead6SMichael Halcrow } 227237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); 228b59db43aSTyler Hicks rc = ecryptfs_new_file_context(ecryptfs_inode); 229237fead6SMichael Halcrow if (rc) { 230d7cdc5feSMichael Halcrow ecryptfs_printk(KERN_ERR, "Error creating new file " 231d7cdc5feSMichael Halcrow "context; rc = [%d]\n", rc); 232d7cdc5feSMichael Halcrow goto out; 233237fead6SMichael Halcrow } 234b59db43aSTyler Hicks rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode); 235391b52f9SMichael Halcrow if (rc) { 236391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 237332ab16fSTyler Hicks "the lower file for the dentry with name " 2389e78d14aSDavid Howells "[%pd]; rc = [%d]\n", __func__, 2399e78d14aSDavid Howells ecryptfs_dentry, rc); 240391b52f9SMichael Halcrow goto out; 241391b52f9SMichael Halcrow } 242b59db43aSTyler Hicks rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode); 243332ab16fSTyler Hicks if (rc) 244d7cdc5feSMichael Halcrow printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); 245b59db43aSTyler Hicks ecryptfs_put_lower_file(ecryptfs_inode); 246237fead6SMichael Halcrow out: 247237fead6SMichael Halcrow return rc; 248237fead6SMichael Halcrow } 249237fead6SMichael Halcrow 250237fead6SMichael Halcrow /** 251237fead6SMichael Halcrow * ecryptfs_create 252237fead6SMichael Halcrow * @dir: The inode of the directory in which to create the file. 253237fead6SMichael Halcrow * @dentry: The eCryptfs dentry 254237fead6SMichael Halcrow * @mode: The mode of the new file. 255237fead6SMichael Halcrow * 256237fead6SMichael Halcrow * Creates a new file. 257237fead6SMichael Halcrow * 258237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 259237fead6SMichael Halcrow */ 260237fead6SMichael Halcrow static int 261549c7297SChristian Brauner ecryptfs_create(struct user_namespace *mnt_userns, 262549c7297SChristian Brauner struct inode *directory_inode, struct dentry *ecryptfs_dentry, 263ebfc3b49SAl Viro umode_t mode, bool excl) 264237fead6SMichael Halcrow { 265b59db43aSTyler Hicks struct inode *ecryptfs_inode; 266237fead6SMichael Halcrow int rc; 267237fead6SMichael Halcrow 268b59db43aSTyler Hicks ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry, 269b59db43aSTyler Hicks mode); 270a1c83681SViresh Kumar if (IS_ERR(ecryptfs_inode)) { 271237fead6SMichael Halcrow ecryptfs_printk(KERN_WARNING, "Failed to create file in" 272237fead6SMichael Halcrow "lower filesystem\n"); 273b59db43aSTyler Hicks rc = PTR_ERR(ecryptfs_inode); 274237fead6SMichael Halcrow goto out; 275237fead6SMichael Halcrow } 276237fead6SMichael Halcrow /* At this point, a file exists on "disk"; we need to make sure 277237fead6SMichael Halcrow * that this on disk file is prepared to be an ecryptfs file */ 278b59db43aSTyler Hicks rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode); 279b59db43aSTyler Hicks if (rc) { 2808bc2d3cfSTyler Hicks ecryptfs_do_unlink(directory_inode, ecryptfs_dentry, 2818bc2d3cfSTyler Hicks ecryptfs_inode); 2820e81ba23SAl Viro iget_failed(ecryptfs_inode); 283b59db43aSTyler Hicks goto out; 284b59db43aSTyler Hicks } 2851e2e547aSAl Viro d_instantiate_new(ecryptfs_dentry, ecryptfs_inode); 286237fead6SMichael Halcrow out: 287237fead6SMichael Halcrow return rc; 288237fead6SMichael Halcrow } 289237fead6SMichael Halcrow 290778aeb42STyler Hicks static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode) 291237fead6SMichael Halcrow { 2922aac0cf8STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 293778aeb42STyler Hicks int rc; 294237fead6SMichael Halcrow 295778aeb42STyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 296391b52f9SMichael Halcrow if (rc) { 297391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 298332ab16fSTyler Hicks "the lower file for the dentry with name " 2999e78d14aSDavid Howells "[%pd]; rc = [%d]\n", __func__, 3009e78d14aSDavid Howells dentry, rc); 301778aeb42STyler Hicks return rc; 302391b52f9SMichael Halcrow } 303778aeb42STyler Hicks 3043b06b3ebSTyler Hicks crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; 3052aac0cf8STyler Hicks /* TODO: lock for crypt_stat comparison */ 3062aac0cf8STyler Hicks if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) 3072aac0cf8STyler Hicks ecryptfs_set_default_sizes(crypt_stat); 308778aeb42STyler Hicks 309778aeb42STyler Hicks rc = ecryptfs_read_and_validate_header_region(inode); 310778aeb42STyler Hicks ecryptfs_put_lower_file(inode); 311237fead6SMichael Halcrow if (rc) { 312778aeb42STyler Hicks rc = ecryptfs_read_and_validate_xattr_region(dentry, inode); 313778aeb42STyler Hicks if (!rc) 314dd2a3b7aSMichael Halcrow crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; 315dd2a3b7aSMichael Halcrow } 316778aeb42STyler Hicks 317778aeb42STyler Hicks /* Must return 0 to allow non-eCryptfs files to be looked up, too */ 318778aeb42STyler Hicks return 0; 319778aeb42STyler Hicks } 320778aeb42STyler Hicks 321778aeb42STyler Hicks /** 322778aeb42STyler Hicks * ecryptfs_lookup_interpose - Dentry interposition for a lookup 323778aeb42STyler Hicks */ 324b1168a92SAl Viro static struct dentry *ecryptfs_lookup_interpose(struct dentry *dentry, 325b1168a92SAl Viro struct dentry *lower_dentry) 326778aeb42STyler Hicks { 327762c6968SAl Viro struct path *path = ecryptfs_dentry_to_lower_path(dentry->d_parent); 328e72b9dd6SAl Viro struct inode *inode, *lower_inode; 329778aeb42STyler Hicks struct ecryptfs_dentry_info *dentry_info; 330778aeb42STyler Hicks int rc = 0; 331778aeb42STyler Hicks 332778aeb42STyler Hicks dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); 333778aeb42STyler Hicks if (!dentry_info) { 334237fead6SMichael Halcrow dput(lower_dentry); 335b1168a92SAl Viro return ERR_PTR(-ENOMEM); 336778aeb42STyler Hicks } 3370b1d9011SAl Viro 338b1168a92SAl Viro fsstack_copy_attr_atime(d_inode(dentry->d_parent), 339762c6968SAl Viro d_inode(path->dentry)); 34084d08fa8SAl Viro BUG_ON(!d_count(lower_dentry)); 3410b1d9011SAl Viro 3420b1d9011SAl Viro ecryptfs_set_dentry_private(dentry, dentry_info); 343762c6968SAl Viro dentry_info->lower_path.mnt = mntget(path->mnt); 34492dd1230SAl Viro dentry_info->lower_path.dentry = lower_dentry; 345778aeb42STyler Hicks 346e72b9dd6SAl Viro /* 347e72b9dd6SAl Viro * negative dentry can go positive under us here - its parent is not 348e72b9dd6SAl Viro * locked. That's OK and that could happen just as we return from 349e72b9dd6SAl Viro * ecryptfs_lookup() anyway. Just need to be careful and fetch 350e72b9dd6SAl Viro * ->d_inode only once - it's not stable here. 351e72b9dd6SAl Viro */ 352e72b9dd6SAl Viro lower_inode = READ_ONCE(lower_dentry->d_inode); 353e72b9dd6SAl Viro 354e72b9dd6SAl Viro if (!lower_inode) { 355778aeb42STyler Hicks /* We want to add because we couldn't find in lower */ 356778aeb42STyler Hicks d_add(dentry, NULL); 357b1168a92SAl Viro return NULL; 358778aeb42STyler Hicks } 359b1168a92SAl Viro inode = __ecryptfs_get_inode(lower_inode, dentry->d_sb); 360778aeb42STyler Hicks if (IS_ERR(inode)) { 361778aeb42STyler Hicks printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n", 362778aeb42STyler Hicks __func__, PTR_ERR(inode)); 363b1168a92SAl Viro return ERR_CAST(inode); 364778aeb42STyler Hicks } 365778aeb42STyler Hicks if (S_ISREG(inode->i_mode)) { 366778aeb42STyler Hicks rc = ecryptfs_i_size_read(dentry, inode); 367778aeb42STyler Hicks if (rc) { 368778aeb42STyler Hicks make_bad_inode(inode); 369b1168a92SAl Viro return ERR_PTR(rc); 370778aeb42STyler Hicks } 371778aeb42STyler Hicks } 372778aeb42STyler Hicks 373778aeb42STyler Hicks if (inode->i_state & I_NEW) 374778aeb42STyler Hicks unlock_new_inode(inode); 375b1168a92SAl Viro return d_splice_alias(inode, dentry); 376addd65adSMichael Halcrow } 377addd65adSMichael Halcrow 378addd65adSMichael Halcrow /** 379addd65adSMichael Halcrow * ecryptfs_lookup 380addd65adSMichael Halcrow * @ecryptfs_dir_inode: The eCryptfs directory inode 381addd65adSMichael Halcrow * @ecryptfs_dentry: The eCryptfs dentry that we are looking up 38289076bc3SAl Viro * @flags: lookup flags 383addd65adSMichael Halcrow * 384addd65adSMichael Halcrow * Find a file on disk. If the file does not exist, then we'll add it to the 385addd65adSMichael Halcrow * dentry cache and continue on to read it from the disk. 386addd65adSMichael Halcrow */ 387addd65adSMichael Halcrow static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, 388addd65adSMichael Halcrow struct dentry *ecryptfs_dentry, 38900cd8dd3SAl Viro unsigned int flags) 390addd65adSMichael Halcrow { 391addd65adSMichael Halcrow char *encrypted_and_encoded_name = NULL; 39288ae4ab9SAl Viro struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 393addd65adSMichael Halcrow struct dentry *lower_dir_dentry, *lower_dentry; 39488ae4ab9SAl Viro const char *name = ecryptfs_dentry->d_name.name; 39588ae4ab9SAl Viro size_t len = ecryptfs_dentry->d_name.len; 396b1168a92SAl Viro struct dentry *res; 397addd65adSMichael Halcrow int rc = 0; 398addd65adSMichael Halcrow 399addd65adSMichael Halcrow lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); 40088ae4ab9SAl Viro 401addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 402addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 403ab13a921SGuenter Roeck if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { 404addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename( 40588ae4ab9SAl Viro &encrypted_and_encoded_name, &len, 40688ae4ab9SAl Viro mount_crypt_stat, name, len); 407addd65adSMichael Halcrow if (rc) { 408addd65adSMichael Halcrow printk(KERN_ERR "%s: Error attempting to encrypt and encode " 409addd65adSMichael Halcrow "filename; rc = [%d]\n", __func__, rc); 410237fead6SMichael Halcrow return ERR_PTR(rc); 411237fead6SMichael Halcrow } 41288ae4ab9SAl Viro name = encrypted_and_encoded_name; 41388ae4ab9SAl Viro } 41488ae4ab9SAl Viro 41588ae4ab9SAl Viro lower_dentry = lookup_one_len_unlocked(name, lower_dir_dentry, len); 416237fead6SMichael Halcrow if (IS_ERR(lower_dentry)) { 417237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 418b1168a92SAl Viro "[%ld] on lower_dentry = [%s]\n", __func__, 419b1168a92SAl Viro PTR_ERR(lower_dentry), 42088ae4ab9SAl Viro name); 421b1168a92SAl Viro res = ERR_CAST(lower_dentry); 42288ae4ab9SAl Viro } else { 423b1168a92SAl Viro res = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry); 42488ae4ab9SAl Viro } 425237fead6SMichael Halcrow kfree(encrypted_and_encoded_name); 426b1168a92SAl Viro return res; 427237fead6SMichael Halcrow } 428237fead6SMichael Halcrow 429237fead6SMichael Halcrow static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, 430237fead6SMichael Halcrow struct dentry *new_dentry) 431237fead6SMichael Halcrow { 432237fead6SMichael Halcrow struct dentry *lower_old_dentry; 433237fead6SMichael Halcrow struct dentry *lower_new_dentry; 434237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 435237fead6SMichael Halcrow u64 file_size_save; 436237fead6SMichael Halcrow int rc; 437237fead6SMichael Halcrow 4382b0143b5SDavid Howells file_size_save = i_size_read(d_inode(old_dentry)); 439237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 440237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 441237fead6SMichael Halcrow dget(lower_old_dentry); 442237fead6SMichael Halcrow dget(lower_new_dentry); 443237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_new_dentry); 4446521f891SChristian Brauner rc = vfs_link(lower_old_dentry, &init_user_ns, 4456521f891SChristian Brauner d_inode(lower_dir_dentry), lower_new_dentry, NULL); 4462b0143b5SDavid Howells if (rc || d_really_is_negative(lower_new_dentry)) 447237fead6SMichael Halcrow goto out_lock; 4485ccf9203STyler Hicks rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); 449237fead6SMichael Halcrow if (rc) 450237fead6SMichael Halcrow goto out_lock; 4512b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 4522b0143b5SDavid Howells fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); 4532b0143b5SDavid Howells set_nlink(d_inode(old_dentry), 4542b0143b5SDavid Howells ecryptfs_inode_to_lower(d_inode(old_dentry))->i_nlink); 4552b0143b5SDavid Howells i_size_write(d_inode(new_dentry), file_size_save); 456237fead6SMichael Halcrow out_lock: 457237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 458237fead6SMichael Halcrow dput(lower_new_dentry); 459237fead6SMichael Halcrow dput(lower_old_dentry); 460237fead6SMichael Halcrow return rc; 461237fead6SMichael Halcrow } 462237fead6SMichael Halcrow 463237fead6SMichael Halcrow static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) 464237fead6SMichael Halcrow { 4652b0143b5SDavid Howells return ecryptfs_do_unlink(dir, dentry, d_inode(dentry)); 466237fead6SMichael Halcrow } 467237fead6SMichael Halcrow 468549c7297SChristian Brauner static int ecryptfs_symlink(struct user_namespace *mnt_userns, 469549c7297SChristian Brauner struct inode *dir, struct dentry *dentry, 470237fead6SMichael Halcrow const char *symname) 471237fead6SMichael Halcrow { 472237fead6SMichael Halcrow int rc; 473237fead6SMichael Halcrow struct dentry *lower_dentry; 474237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 475237fead6SMichael Halcrow char *encoded_symname; 476addd65adSMichael Halcrow size_t encoded_symlen; 477addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 478237fead6SMichael Halcrow 479237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 480237fead6SMichael Halcrow dget(lower_dentry); 481237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 482addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 483addd65adSMichael Halcrow dir->i_sb)->mount_crypt_stat; 484addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, 485addd65adSMichael Halcrow &encoded_symlen, 486addd65adSMichael Halcrow mount_crypt_stat, symname, 487addd65adSMichael Halcrow strlen(symname)); 488addd65adSMichael Halcrow if (rc) 489237fead6SMichael Halcrow goto out_lock; 4906521f891SChristian Brauner rc = vfs_symlink(&init_user_ns, d_inode(lower_dir_dentry), lower_dentry, 491db2e747bSMiklos Szeredi encoded_symname); 492237fead6SMichael Halcrow kfree(encoded_symname); 4932b0143b5SDavid Howells if (rc || d_really_is_negative(lower_dentry)) 494237fead6SMichael Halcrow goto out_lock; 4955ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 496237fead6SMichael Halcrow if (rc) 497237fead6SMichael Halcrow goto out_lock; 4982b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 4992b0143b5SDavid Howells fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); 500237fead6SMichael Halcrow out_lock: 501237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 502237fead6SMichael Halcrow dput(lower_dentry); 5032b0143b5SDavid Howells if (d_really_is_negative(dentry)) 504237fead6SMichael Halcrow d_drop(dentry); 505237fead6SMichael Halcrow return rc; 506237fead6SMichael Halcrow } 507237fead6SMichael Halcrow 508549c7297SChristian Brauner static int ecryptfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir, 509549c7297SChristian Brauner struct dentry *dentry, umode_t mode) 510237fead6SMichael Halcrow { 511237fead6SMichael Halcrow int rc; 512237fead6SMichael Halcrow struct dentry *lower_dentry; 513237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 514237fead6SMichael Halcrow 515237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 516237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 5176521f891SChristian Brauner rc = vfs_mkdir(&init_user_ns, d_inode(lower_dir_dentry), lower_dentry, 5186521f891SChristian Brauner mode); 5192b0143b5SDavid Howells if (rc || d_really_is_negative(lower_dentry)) 520237fead6SMichael Halcrow goto out; 5215ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 522237fead6SMichael Halcrow if (rc) 523237fead6SMichael Halcrow goto out; 5242b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 5252b0143b5SDavid Howells fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); 5262b0143b5SDavid Howells set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink); 527237fead6SMichael Halcrow out: 528237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 5292b0143b5SDavid Howells if (d_really_is_negative(dentry)) 530237fead6SMichael Halcrow d_drop(dentry); 531237fead6SMichael Halcrow return rc; 532237fead6SMichael Halcrow } 533237fead6SMichael Halcrow 534237fead6SMichael Halcrow static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) 535237fead6SMichael Halcrow { 536237fead6SMichael Halcrow struct dentry *lower_dentry; 537237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 538bcf0d9d4SAl Viro struct inode *lower_dir_inode; 53945ec4abaSMichael Halcrow int rc; 540237fead6SMichael Halcrow 541237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 542bcf0d9d4SAl Viro lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent); 543bcf0d9d4SAl Viro lower_dir_inode = d_inode(lower_dir_dentry); 544bcf0d9d4SAl Viro 545bcf0d9d4SAl Viro inode_lock_nested(lower_dir_inode, I_MUTEX_PARENT); 546bcf0d9d4SAl Viro dget(lower_dentry); // don't even try to make the lower negative 547bcf0d9d4SAl Viro if (lower_dentry->d_parent != lower_dir_dentry) 548bcf0d9d4SAl Viro rc = -EINVAL; 549bcf0d9d4SAl Viro else if (d_unhashed(lower_dentry)) 550bcf0d9d4SAl Viro rc = -EINVAL; 551bcf0d9d4SAl Viro else 5526521f891SChristian Brauner rc = vfs_rmdir(&init_user_ns, lower_dir_inode, lower_dentry); 553bcf0d9d4SAl Viro if (!rc) { 5542b0143b5SDavid Howells clear_nlink(d_inode(dentry)); 555bcf0d9d4SAl Viro fsstack_copy_attr_times(dir, lower_dir_inode); 556bcf0d9d4SAl Viro set_nlink(dir, lower_dir_inode->i_nlink); 557bcf0d9d4SAl Viro } 558bcf0d9d4SAl Viro dput(lower_dentry); 559bcf0d9d4SAl Viro inode_unlock(lower_dir_inode); 560237fead6SMichael Halcrow if (!rc) 561237fead6SMichael Halcrow d_drop(dentry); 562237fead6SMichael Halcrow return rc; 563237fead6SMichael Halcrow } 564237fead6SMichael Halcrow 565237fead6SMichael Halcrow static int 566549c7297SChristian Brauner ecryptfs_mknod(struct user_namespace *mnt_userns, struct inode *dir, 567549c7297SChristian Brauner struct dentry *dentry, umode_t mode, dev_t dev) 568237fead6SMichael Halcrow { 569237fead6SMichael Halcrow int rc; 570237fead6SMichael Halcrow struct dentry *lower_dentry; 571237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 572237fead6SMichael Halcrow 573237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 574237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 5756521f891SChristian Brauner rc = vfs_mknod(&init_user_ns, d_inode(lower_dir_dentry), lower_dentry, 5766521f891SChristian Brauner mode, dev); 5772b0143b5SDavid Howells if (rc || d_really_is_negative(lower_dentry)) 578237fead6SMichael Halcrow goto out; 5795ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 580237fead6SMichael Halcrow if (rc) 581237fead6SMichael Halcrow goto out; 5822b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 5832b0143b5SDavid Howells fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); 584237fead6SMichael Halcrow out: 585237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 5862b0143b5SDavid Howells if (d_really_is_negative(dentry)) 587237fead6SMichael Halcrow d_drop(dentry); 588237fead6SMichael Halcrow return rc; 589237fead6SMichael Halcrow } 590237fead6SMichael Halcrow 591237fead6SMichael Halcrow static int 592549c7297SChristian Brauner ecryptfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir, 593549c7297SChristian Brauner struct dentry *old_dentry, struct inode *new_dir, 594549c7297SChristian Brauner struct dentry *new_dentry, unsigned int flags) 595237fead6SMichael Halcrow { 596237fead6SMichael Halcrow int rc; 597237fead6SMichael Halcrow struct dentry *lower_old_dentry; 598237fead6SMichael Halcrow struct dentry *lower_new_dentry; 599237fead6SMichael Halcrow struct dentry *lower_old_dir_dentry; 600237fead6SMichael Halcrow struct dentry *lower_new_dir_dentry; 601bcf0d9d4SAl Viro struct dentry *trap; 6028335eafcSTyler Hicks struct inode *target_inode; 6039fe61450SChristian Brauner struct renamedata rd = {}; 604237fead6SMichael Halcrow 6051cd66c93SMiklos Szeredi if (flags) 6061cd66c93SMiklos Szeredi return -EINVAL; 6071cd66c93SMiklos Szeredi 608bcf0d9d4SAl Viro lower_old_dir_dentry = ecryptfs_dentry_to_lower(old_dentry->d_parent); 609bcf0d9d4SAl Viro lower_new_dir_dentry = ecryptfs_dentry_to_lower(new_dentry->d_parent); 610bcf0d9d4SAl Viro 611237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 612237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 613bcf0d9d4SAl Viro 6142b0143b5SDavid Howells target_inode = d_inode(new_dentry); 615bcf0d9d4SAl Viro 6160d132f73SErez Zadok trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 617bcf0d9d4SAl Viro dget(lower_new_dentry); 6180d132f73SErez Zadok rc = -EINVAL; 61974dd7c97SAl Viro if (lower_old_dentry->d_parent != lower_old_dir_dentry) 6200d132f73SErez Zadok goto out_lock; 62174dd7c97SAl Viro if (lower_new_dentry->d_parent != lower_new_dir_dentry) 62274dd7c97SAl Viro goto out_lock; 62374dd7c97SAl Viro if (d_unhashed(lower_old_dentry) || d_unhashed(lower_new_dentry)) 62474dd7c97SAl Viro goto out_lock; 62574dd7c97SAl Viro /* source should not be ancestor of target */ 62674dd7c97SAl Viro if (trap == lower_old_dentry) 62774dd7c97SAl Viro goto out_lock; 6280d132f73SErez Zadok /* target should not be ancestor of source */ 6290d132f73SErez Zadok if (trap == lower_new_dentry) { 6300d132f73SErez Zadok rc = -ENOTEMPTY; 6310d132f73SErez Zadok goto out_lock; 6320d132f73SErez Zadok } 6339fe61450SChristian Brauner 6346521f891SChristian Brauner rd.old_mnt_userns = &init_user_ns; 6359fe61450SChristian Brauner rd.old_dir = d_inode(lower_old_dir_dentry); 6369fe61450SChristian Brauner rd.old_dentry = lower_old_dentry; 6376521f891SChristian Brauner rd.new_mnt_userns = &init_user_ns; 6389fe61450SChristian Brauner rd.new_dir = d_inode(lower_new_dir_dentry); 6399fe61450SChristian Brauner rd.new_dentry = lower_new_dentry; 6409fe61450SChristian Brauner rc = vfs_rename(&rd); 641237fead6SMichael Halcrow if (rc) 642237fead6SMichael Halcrow goto out_lock; 6438335eafcSTyler Hicks if (target_inode) 6448335eafcSTyler Hicks fsstack_copy_attr_all(target_inode, 6458335eafcSTyler Hicks ecryptfs_inode_to_lower(target_inode)); 6462b0143b5SDavid Howells fsstack_copy_attr_all(new_dir, d_inode(lower_new_dir_dentry)); 647237fead6SMichael Halcrow if (new_dir != old_dir) 6482b0143b5SDavid Howells fsstack_copy_attr_all(old_dir, d_inode(lower_old_dir_dentry)); 649237fead6SMichael Halcrow out_lock: 650237fead6SMichael Halcrow dput(lower_new_dentry); 651bcf0d9d4SAl Viro unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 652237fead6SMichael Halcrow return rc; 653237fead6SMichael Halcrow } 654237fead6SMichael Halcrow 655b22e8fedSAl Viro static char *ecryptfs_readlink_lower(struct dentry *dentry, size_t *bufsiz) 656237fead6SMichael Halcrow { 6576c988f57SMiklos Szeredi DEFINE_DELAYED_CALL(done); 6583a60a168STyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 6596c988f57SMiklos Szeredi const char *link; 660b22e8fedSAl Viro char *buf; 661addd65adSMichael Halcrow int rc; 662237fead6SMichael Halcrow 6636c988f57SMiklos Szeredi link = vfs_get_link(lower_dentry, &done); 6646c988f57SMiklos Szeredi if (IS_ERR(link)) 6656c988f57SMiklos Szeredi return ERR_CAST(link); 6666c988f57SMiklos Szeredi 667b22e8fedSAl Viro rc = ecryptfs_decode_and_decrypt_filename(&buf, bufsiz, dentry->d_sb, 6686c988f57SMiklos Szeredi link, strlen(link)); 6696c988f57SMiklos Szeredi do_delayed_call(&done); 6706c988f57SMiklos Szeredi if (rc) 6716c988f57SMiklos Szeredi return ERR_PTR(rc); 6726c988f57SMiklos Szeredi 6736c988f57SMiklos Szeredi return buf; 6743a60a168STyler Hicks } 6753a60a168STyler Hicks 6766b255391SAl Viro static const char *ecryptfs_get_link(struct dentry *dentry, 677fceef393SAl Viro struct inode *inode, 678fceef393SAl Viro struct delayed_call *done) 679237fead6SMichael Halcrow { 680b22e8fedSAl Viro size_t len; 6816b255391SAl Viro char *buf; 6826b255391SAl Viro 6836b255391SAl Viro if (!dentry) 6846b255391SAl Viro return ERR_PTR(-ECHILD); 6856b255391SAl Viro 6866b255391SAl Viro buf = ecryptfs_readlink_lower(dentry, &len); 687b22e8fedSAl Viro if (IS_ERR(buf)) 688680baacbSAl Viro return buf; 6892b0143b5SDavid Howells fsstack_copy_attr_atime(d_inode(dentry), 6902b0143b5SDavid Howells d_inode(ecryptfs_dentry_to_lower(dentry))); 691408bd629SAl Viro buf[len] = '\0'; 692fceef393SAl Viro set_delayed_call(done, kfree_link, buf); 693fceef393SAl Viro return buf; 694237fead6SMichael Halcrow } 695237fead6SMichael Halcrow 696237fead6SMichael Halcrow /** 697237fead6SMichael Halcrow * upper_size_to_lower_size 698237fead6SMichael Halcrow * @crypt_stat: Crypt_stat associated with file 699237fead6SMichael Halcrow * @upper_size: Size of the upper file 700237fead6SMichael Halcrow * 701cc11beffSMichael Halcrow * Calculate the required size of the lower file based on the 702237fead6SMichael Halcrow * specified size of the upper file. This calculation is based on the 703237fead6SMichael Halcrow * number of headers in the underlying file and the extent size. 704237fead6SMichael Halcrow * 705237fead6SMichael Halcrow * Returns Calculated size of the lower file. 706237fead6SMichael Halcrow */ 707237fead6SMichael Halcrow static loff_t 708237fead6SMichael Halcrow upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, 709237fead6SMichael Halcrow loff_t upper_size) 710237fead6SMichael Halcrow { 711237fead6SMichael Halcrow loff_t lower_size; 712237fead6SMichael Halcrow 713157f1071STyler Hicks lower_size = ecryptfs_lower_header_size(crypt_stat); 714237fead6SMichael Halcrow if (upper_size != 0) { 715237fead6SMichael Halcrow loff_t num_extents; 716237fead6SMichael Halcrow 717237fead6SMichael Halcrow num_extents = upper_size >> crypt_stat->extent_shift; 718237fead6SMichael Halcrow if (upper_size & ~crypt_stat->extent_mask) 719237fead6SMichael Halcrow num_extents++; 720237fead6SMichael Halcrow lower_size += (num_extents * crypt_stat->extent_size); 721237fead6SMichael Halcrow } 722237fead6SMichael Halcrow return lower_size; 723237fead6SMichael Halcrow } 724237fead6SMichael Halcrow 725237fead6SMichael Halcrow /** 7265f3ef64fSTyler Hicks * truncate_upper 727237fead6SMichael Halcrow * @dentry: The ecryptfs layer dentry 7285f3ef64fSTyler Hicks * @ia: Address of the ecryptfs inode's attributes 7295f3ef64fSTyler Hicks * @lower_ia: Address of the lower inode's attributes 730237fead6SMichael Halcrow * 731237fead6SMichael Halcrow * Function to handle truncations modifying the size of the file. Note 732237fead6SMichael Halcrow * that the file sizes are interpolated. When expanding, we are simply 7335f3ef64fSTyler Hicks * writing strings of 0's out. When truncating, we truncate the upper 7345f3ef64fSTyler Hicks * inode and update the lower_ia according to the page index 7355f3ef64fSTyler Hicks * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, 7365f3ef64fSTyler Hicks * the caller must use lower_ia in a call to notify_change() to perform 7375f3ef64fSTyler Hicks * the truncation of the lower inode. 738237fead6SMichael Halcrow * 739237fead6SMichael Halcrow * Returns zero on success; non-zero otherwise 740237fead6SMichael Halcrow */ 7415f3ef64fSTyler Hicks static int truncate_upper(struct dentry *dentry, struct iattr *ia, 7425f3ef64fSTyler Hicks struct iattr *lower_ia) 743237fead6SMichael Halcrow { 744237fead6SMichael Halcrow int rc = 0; 7452b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 746237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 747237fead6SMichael Halcrow loff_t i_size = i_size_read(inode); 748237fead6SMichael Halcrow loff_t lower_size_before_truncate; 749237fead6SMichael Halcrow loff_t lower_size_after_truncate; 750237fead6SMichael Halcrow 7515f3ef64fSTyler Hicks if (unlikely((ia->ia_size == i_size))) { 7525f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 753332ab16fSTyler Hicks return 0; 7545f3ef64fSTyler Hicks } 7553b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 756332ab16fSTyler Hicks if (rc) 757332ab16fSTyler Hicks return rc; 7582b0143b5SDavid Howells crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; 759237fead6SMichael Halcrow /* Switch on growing or shrinking file */ 7605f3ef64fSTyler Hicks if (ia->ia_size > i_size) { 7612ed92554SMichael Halcrow char zero[] = { 0x00 }; 762240e2df5SMichael Halcrow 7635f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 7642ed92554SMichael Halcrow /* Write a single 0 at the last position of the file; 7652ed92554SMichael Halcrow * this triggers code that will fill in 0's throughout 7662ed92554SMichael Halcrow * the intermediate portion of the previous end of the 7672ed92554SMichael Halcrow * file and the new and of the file */ 76848c1e44aSAl Viro rc = ecryptfs_write(inode, zero, 7695f3ef64fSTyler Hicks (ia->ia_size - 1), 1); 7705f3ef64fSTyler Hicks } else { /* ia->ia_size < i_size_read(inode) */ 7715f3ef64fSTyler Hicks /* We're chopping off all the pages down to the page 7725f3ef64fSTyler Hicks * in which ia->ia_size is located. Fill in the end of 773ea1754a0SKirill A. Shutemov * that page from (ia->ia_size & ~PAGE_MASK) to 774ea1754a0SKirill A. Shutemov * PAGE_SIZE with zeros. */ 77509cbfeafSKirill A. Shutemov size_t num_zeros = (PAGE_SIZE 77609cbfeafSKirill A. Shutemov - (ia->ia_size & ~PAGE_MASK)); 7772ed92554SMichael Halcrow 7782c27c65eSChristoph Hellwig if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { 7792c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 7805f3ef64fSTyler Hicks lower_ia->ia_size = ia->ia_size; 7815f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 78248c1e44aSAl Viro goto out; 78313a791b4STyler Hicks } 7842ed92554SMichael Halcrow if (num_zeros) { 7852ed92554SMichael Halcrow char *zeros_virt; 7862ed92554SMichael Halcrow 7872ed92554SMichael Halcrow zeros_virt = kzalloc(num_zeros, GFP_KERNEL); 7882ed92554SMichael Halcrow if (!zeros_virt) { 7892ed92554SMichael Halcrow rc = -ENOMEM; 79048c1e44aSAl Viro goto out; 791240e2df5SMichael Halcrow } 79248c1e44aSAl Viro rc = ecryptfs_write(inode, zeros_virt, 7935f3ef64fSTyler Hicks ia->ia_size, num_zeros); 7942ed92554SMichael Halcrow kfree(zeros_virt); 7955dda6992SMichael Halcrow if (rc) { 796240e2df5SMichael Halcrow printk(KERN_ERR "Error attempting to zero out " 797240e2df5SMichael Halcrow "the remainder of the end page on " 798240e2df5SMichael Halcrow "reducing truncate; rc = [%d]\n", rc); 79948c1e44aSAl Viro goto out; 800240e2df5SMichael Halcrow } 801240e2df5SMichael Halcrow } 8022c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 8030216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 804dd2a3b7aSMichael Halcrow if (rc) { 805dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 806dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 807dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 80848c1e44aSAl Viro goto out; 809dd2a3b7aSMichael Halcrow } 810237fead6SMichael Halcrow /* We are reducing the size of the ecryptfs file, and need to 811237fead6SMichael Halcrow * know if we need to reduce the size of the lower file. */ 812237fead6SMichael Halcrow lower_size_before_truncate = 813237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, i_size); 814237fead6SMichael Halcrow lower_size_after_truncate = 8155f3ef64fSTyler Hicks upper_size_to_lower_size(crypt_stat, ia->ia_size); 8165f3ef64fSTyler Hicks if (lower_size_after_truncate < lower_size_before_truncate) { 8175f3ef64fSTyler Hicks lower_ia->ia_size = lower_size_after_truncate; 8185f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 8195f3ef64fSTyler Hicks } else 8205f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 821237fead6SMichael Halcrow } 822237fead6SMichael Halcrow out: 823332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 824237fead6SMichael Halcrow return rc; 825237fead6SMichael Halcrow } 826237fead6SMichael Halcrow 827a261a039STyler Hicks static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset) 828a261a039STyler Hicks { 829a261a039STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 830a261a039STyler Hicks loff_t lower_oldsize, lower_newsize; 831a261a039STyler Hicks 832a261a039STyler Hicks crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; 833a261a039STyler Hicks lower_oldsize = upper_size_to_lower_size(crypt_stat, 834a261a039STyler Hicks i_size_read(inode)); 835a261a039STyler Hicks lower_newsize = upper_size_to_lower_size(crypt_stat, offset); 836a261a039STyler Hicks if (lower_newsize > lower_oldsize) { 837a261a039STyler Hicks /* 838a261a039STyler Hicks * The eCryptfs inode and the new *lower* size are mixed here 839a261a039STyler Hicks * because we may not have the lower i_mutex held and/or it may 840a261a039STyler Hicks * not be appropriate to call inode_newsize_ok() with inodes 841a261a039STyler Hicks * from other filesystems. 842a261a039STyler Hicks */ 843a261a039STyler Hicks return inode_newsize_ok(inode, lower_newsize); 844a261a039STyler Hicks } 845a261a039STyler Hicks 846a261a039STyler Hicks return 0; 847a261a039STyler Hicks } 848a261a039STyler Hicks 8495f3ef64fSTyler Hicks /** 8505f3ef64fSTyler Hicks * ecryptfs_truncate 8515f3ef64fSTyler Hicks * @dentry: The ecryptfs layer dentry 8525f3ef64fSTyler Hicks * @new_length: The length to expand the file to 8535f3ef64fSTyler Hicks * 8545f3ef64fSTyler Hicks * Simple function that handles the truncation of an eCryptfs inode and 8555f3ef64fSTyler Hicks * its corresponding lower inode. 8565f3ef64fSTyler Hicks * 8575f3ef64fSTyler Hicks * Returns zero on success; non-zero otherwise 8585f3ef64fSTyler Hicks */ 8595f3ef64fSTyler Hicks int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) 8605f3ef64fSTyler Hicks { 8615f3ef64fSTyler Hicks struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; 8625f3ef64fSTyler Hicks struct iattr lower_ia = { .ia_valid = 0 }; 8635f3ef64fSTyler Hicks int rc; 8645f3ef64fSTyler Hicks 8652b0143b5SDavid Howells rc = ecryptfs_inode_newsize_ok(d_inode(dentry), new_length); 866a261a039STyler Hicks if (rc) 867a261a039STyler Hicks return rc; 868a261a039STyler Hicks 8695f3ef64fSTyler Hicks rc = truncate_upper(dentry, &ia, &lower_ia); 8705f3ef64fSTyler Hicks if (!rc && lower_ia.ia_valid & ATTR_SIZE) { 8715f3ef64fSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 8725f3ef64fSTyler Hicks 8735955102cSAl Viro inode_lock(d_inode(lower_dentry)); 8742f221d6fSChristian Brauner rc = notify_change(&init_user_ns, lower_dentry, 8752f221d6fSChristian Brauner &lower_ia, NULL); 8765955102cSAl Viro inode_unlock(d_inode(lower_dentry)); 8775f3ef64fSTyler Hicks } 8785f3ef64fSTyler Hicks return rc; 8795f3ef64fSTyler Hicks } 8805f3ef64fSTyler Hicks 881237fead6SMichael Halcrow static int 882549c7297SChristian Brauner ecryptfs_permission(struct user_namespace *mnt_userns, struct inode *inode, 883549c7297SChristian Brauner int mask) 884237fead6SMichael Halcrow { 88547291baaSChristian Brauner return inode_permission(&init_user_ns, 88647291baaSChristian Brauner ecryptfs_inode_to_lower(inode), mask); 887237fead6SMichael Halcrow } 888237fead6SMichael Halcrow 889237fead6SMichael Halcrow /** 890237fead6SMichael Halcrow * ecryptfs_setattr 891237fead6SMichael Halcrow * @dentry: dentry handle to the inode to modify 892237fead6SMichael Halcrow * @ia: Structure with flags of what to change and values 893237fead6SMichael Halcrow * 894237fead6SMichael Halcrow * Updates the metadata of an inode. If the update is to the size 895237fead6SMichael Halcrow * i.e. truncation, then ecryptfs_truncate will handle the size modification 896237fead6SMichael Halcrow * of both the ecryptfs inode and the lower inode. 897237fead6SMichael Halcrow * 898237fead6SMichael Halcrow * All other metadata changes will be passed right to the lower filesystem, 899237fead6SMichael Halcrow * and we will just update our inode to look like the lower. 900237fead6SMichael Halcrow */ 901549c7297SChristian Brauner static int ecryptfs_setattr(struct user_namespace *mnt_userns, 902549c7297SChristian Brauner struct dentry *dentry, struct iattr *ia) 903237fead6SMichael Halcrow { 904237fead6SMichael Halcrow int rc = 0; 905237fead6SMichael Halcrow struct dentry *lower_dentry; 9065f3ef64fSTyler Hicks struct iattr lower_ia; 907237fead6SMichael Halcrow struct inode *inode; 908237fead6SMichael Halcrow struct inode *lower_inode; 909237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 910237fead6SMichael Halcrow 9112b0143b5SDavid Howells crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; 912e81f3340SHerbert Xu if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) { 913e81f3340SHerbert Xu rc = ecryptfs_init_crypt_stat(crypt_stat); 914e81f3340SHerbert Xu if (rc) 915e81f3340SHerbert Xu return rc; 916e81f3340SHerbert Xu } 9172b0143b5SDavid Howells inode = d_inode(dentry); 918237fead6SMichael Halcrow lower_inode = ecryptfs_inode_to_lower(inode); 919e10f281bSMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 920e10f281bSMichael Halcrow mutex_lock(&crypt_stat->cs_mutex); 921e36cb0b8SDavid Howells if (d_is_dir(dentry)) 922e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 923e36cb0b8SDavid Howells else if (d_is_reg(dentry) 92464ee4808SMichael Halcrow && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) 92564ee4808SMichael Halcrow || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { 926e10f281bSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 927e10f281bSMichael Halcrow 928e10f281bSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 929e10f281bSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 9303b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 931332ab16fSTyler Hicks if (rc) { 932332ab16fSTyler Hicks mutex_unlock(&crypt_stat->cs_mutex); 933332ab16fSTyler Hicks goto out; 934332ab16fSTyler Hicks } 935d7cdc5feSMichael Halcrow rc = ecryptfs_read_metadata(dentry); 936332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 9375dda6992SMichael Halcrow if (rc) { 938e10f281bSMichael Halcrow if (!(mount_crypt_stat->flags 939e10f281bSMichael Halcrow & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { 940e10f281bSMichael Halcrow rc = -EIO; 94125bd8174SMichael Halcrow printk(KERN_WARNING "Either the lower file " 942e10f281bSMichael Halcrow "is not in a valid eCryptfs format, " 94325bd8174SMichael Halcrow "or the key could not be retrieved. " 94425bd8174SMichael Halcrow "Plaintext passthrough mode is not " 945e10f281bSMichael Halcrow "enabled; returning -EIO\n"); 946e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 947e10f281bSMichael Halcrow goto out; 948e10f281bSMichael Halcrow } 949e10f281bSMichael Halcrow rc = 0; 9503aeb86eaSTyler Hicks crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED 9513aeb86eaSTyler Hicks | ECRYPTFS_ENCRYPTED); 952e10f281bSMichael Halcrow } 953e10f281bSMichael Halcrow } 954e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 955a261a039STyler Hicks 9562f221d6fSChristian Brauner rc = setattr_prepare(&init_user_ns, dentry, ia); 957a261a039STyler Hicks if (rc) 958a261a039STyler Hicks goto out; 959a261a039STyler Hicks if (ia->ia_valid & ATTR_SIZE) { 960a261a039STyler Hicks rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size); 961a261a039STyler Hicks if (rc) 962a261a039STyler Hicks goto out; 963a261a039STyler Hicks } 964a261a039STyler Hicks 9655f3ef64fSTyler Hicks memcpy(&lower_ia, ia, sizeof(lower_ia)); 9665f3ef64fSTyler Hicks if (ia->ia_valid & ATTR_FILE) 9675f3ef64fSTyler Hicks lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); 968237fead6SMichael Halcrow if (ia->ia_valid & ATTR_SIZE) { 9695f3ef64fSTyler Hicks rc = truncate_upper(dentry, ia, &lower_ia); 970237fead6SMichael Halcrow if (rc < 0) 971237fead6SMichael Halcrow goto out; 972237fead6SMichael Halcrow } 9731ac564ecSJeff Layton 9741ac564ecSJeff Layton /* 9751ac564ecSJeff Layton * mode change is for clearing setuid/setgid bits. Allow lower fs 9761ac564ecSJeff Layton * to interpret this in its own way. 9771ac564ecSJeff Layton */ 9785f3ef64fSTyler Hicks if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 9795f3ef64fSTyler Hicks lower_ia.ia_valid &= ~ATTR_MODE; 9801ac564ecSJeff Layton 9815955102cSAl Viro inode_lock(d_inode(lower_dentry)); 9822f221d6fSChristian Brauner rc = notify_change(&init_user_ns, lower_dentry, &lower_ia, NULL); 9835955102cSAl Viro inode_unlock(d_inode(lower_dentry)); 984237fead6SMichael Halcrow out: 9859afa2fb6SErez Zadok fsstack_copy_attr_all(inode, lower_inode); 986237fead6SMichael Halcrow return rc; 987237fead6SMichael Halcrow } 988237fead6SMichael Halcrow 989549c7297SChristian Brauner static int ecryptfs_getattr_link(struct user_namespace *mnt_userns, 990549c7297SChristian Brauner const struct path *path, struct kstat *stat, 991a528d35eSDavid Howells u32 request_mask, unsigned int flags) 9923a60a168STyler Hicks { 993a528d35eSDavid Howells struct dentry *dentry = path->dentry; 9943a60a168STyler Hicks struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 9953a60a168STyler Hicks int rc = 0; 9963a60a168STyler Hicks 9973a60a168STyler Hicks mount_crypt_stat = &ecryptfs_superblock_to_private( 9983a60a168STyler Hicks dentry->d_sb)->mount_crypt_stat; 9990d56a451SChristian Brauner generic_fillattr(&init_user_ns, d_inode(dentry), stat); 10003a60a168STyler Hicks if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { 10013a60a168STyler Hicks char *target; 10023a60a168STyler Hicks size_t targetsiz; 10033a60a168STyler Hicks 1004b22e8fedSAl Viro target = ecryptfs_readlink_lower(dentry, &targetsiz); 1005b22e8fedSAl Viro if (!IS_ERR(target)) { 10063a60a168STyler Hicks kfree(target); 10073a60a168STyler Hicks stat->size = targetsiz; 1008b22e8fedSAl Viro } else { 1009b22e8fedSAl Viro rc = PTR_ERR(target); 10103a60a168STyler Hicks } 10113a60a168STyler Hicks } 10123a60a168STyler Hicks return rc; 10133a60a168STyler Hicks } 10143a60a168STyler Hicks 1015549c7297SChristian Brauner static int ecryptfs_getattr(struct user_namespace *mnt_userns, 1016549c7297SChristian Brauner const struct path *path, struct kstat *stat, 1017a528d35eSDavid Howells u32 request_mask, unsigned int flags) 1018f8f484d1STyler Hicks { 1019a528d35eSDavid Howells struct dentry *dentry = path->dentry; 1020f8f484d1STyler Hicks struct kstat lower_stat; 1021f8f484d1STyler Hicks int rc; 1022f8f484d1STyler Hicks 1023a528d35eSDavid Howells rc = vfs_getattr(ecryptfs_dentry_to_lower_path(dentry), &lower_stat, 1024a528d35eSDavid Howells request_mask, flags); 1025f8f484d1STyler Hicks if (!rc) { 10262b0143b5SDavid Howells fsstack_copy_attr_all(d_inode(dentry), 10272b0143b5SDavid Howells ecryptfs_inode_to_lower(d_inode(dentry))); 10280d56a451SChristian Brauner generic_fillattr(&init_user_ns, d_inode(dentry), stat); 1029f8f484d1STyler Hicks stat->blocks = lower_stat.blocks; 1030f8f484d1STyler Hicks } 1031f8f484d1STyler Hicks return rc; 1032f8f484d1STyler Hicks } 1033f8f484d1STyler Hicks 1034dd2a3b7aSMichael Halcrow int 10353767e255SAl Viro ecryptfs_setxattr(struct dentry *dentry, struct inode *inode, 10363767e255SAl Viro const char *name, const void *value, 1037237fead6SMichael Halcrow size_t size, int flags) 1038237fead6SMichael Halcrow { 10395d6c3191SAndreas Gruenbacher int rc; 1040237fead6SMichael Halcrow struct dentry *lower_dentry; 10410b964446SMiklos Szeredi struct inode *lower_inode; 1042237fead6SMichael Halcrow 1043237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 10440b964446SMiklos Szeredi lower_inode = d_inode(lower_dentry); 10450b964446SMiklos Szeredi if (!(lower_inode->i_opflags & IOP_XATTR)) { 1046cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1047237fead6SMichael Halcrow goto out; 1048237fead6SMichael Halcrow } 10490b964446SMiklos Szeredi inode_lock(lower_inode); 10507d6beb71SLinus Torvalds rc = __vfs_setxattr_locked(&init_user_ns, lower_dentry, name, value, size, flags, NULL); 10510b964446SMiklos Szeredi inode_unlock(lower_inode); 10523767e255SAl Viro if (!rc && inode) 10530b964446SMiklos Szeredi fsstack_copy_attr_all(inode, lower_inode); 1054237fead6SMichael Halcrow out: 1055237fead6SMichael Halcrow return rc; 1056237fead6SMichael Halcrow } 1057237fead6SMichael Halcrow 1058dd2a3b7aSMichael Halcrow ssize_t 1059ce23e640SAl Viro ecryptfs_getxattr_lower(struct dentry *lower_dentry, struct inode *lower_inode, 1060ce23e640SAl Viro const char *name, void *value, size_t size) 1061d7cdc5feSMichael Halcrow { 10625d6c3191SAndreas Gruenbacher int rc; 1063d7cdc5feSMichael Halcrow 10645d6c3191SAndreas Gruenbacher if (!(lower_inode->i_opflags & IOP_XATTR)) { 1065cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1066d7cdc5feSMichael Halcrow goto out; 1067d7cdc5feSMichael Halcrow } 1068ce23e640SAl Viro inode_lock(lower_inode); 10695d6c3191SAndreas Gruenbacher rc = __vfs_getxattr(lower_dentry, lower_inode, name, value, size); 1070ce23e640SAl Viro inode_unlock(lower_inode); 1071d7cdc5feSMichael Halcrow out: 1072d7cdc5feSMichael Halcrow return rc; 1073d7cdc5feSMichael Halcrow } 1074d7cdc5feSMichael Halcrow 10757896b631SAdrian Bunk static ssize_t 1076ce23e640SAl Viro ecryptfs_getxattr(struct dentry *dentry, struct inode *inode, 1077ce23e640SAl Viro const char *name, void *value, size_t size) 1078237fead6SMichael Halcrow { 1079ce23e640SAl Viro return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), 1080ce23e640SAl Viro ecryptfs_inode_to_lower(inode), 1081ce23e640SAl Viro name, value, size); 1082237fead6SMichael Halcrow } 1083237fead6SMichael Halcrow 1084237fead6SMichael Halcrow static ssize_t 1085237fead6SMichael Halcrow ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) 1086237fead6SMichael Halcrow { 1087237fead6SMichael Halcrow int rc = 0; 1088237fead6SMichael Halcrow struct dentry *lower_dentry; 1089237fead6SMichael Halcrow 1090237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 10912b0143b5SDavid Howells if (!d_inode(lower_dentry)->i_op->listxattr) { 1092cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1093237fead6SMichael Halcrow goto out; 1094237fead6SMichael Halcrow } 10955955102cSAl Viro inode_lock(d_inode(lower_dentry)); 10962b0143b5SDavid Howells rc = d_inode(lower_dentry)->i_op->listxattr(lower_dentry, list, size); 10975955102cSAl Viro inode_unlock(d_inode(lower_dentry)); 1098237fead6SMichael Halcrow out: 1099237fead6SMichael Halcrow return rc; 1100237fead6SMichael Halcrow } 1101237fead6SMichael Halcrow 11024b899da5SAndreas Gruenbacher static int ecryptfs_removexattr(struct dentry *dentry, struct inode *inode, 11034b899da5SAndreas Gruenbacher const char *name) 1104237fead6SMichael Halcrow { 11055d6c3191SAndreas Gruenbacher int rc; 1106237fead6SMichael Halcrow struct dentry *lower_dentry; 11074b899da5SAndreas Gruenbacher struct inode *lower_inode; 1108237fead6SMichael Halcrow 1109237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 11104b899da5SAndreas Gruenbacher lower_inode = ecryptfs_inode_to_lower(inode); 11115d6c3191SAndreas Gruenbacher if (!(lower_inode->i_opflags & IOP_XATTR)) { 1112cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1113237fead6SMichael Halcrow goto out; 1114237fead6SMichael Halcrow } 11154b899da5SAndreas Gruenbacher inode_lock(lower_inode); 1116c7c7a1a1STycho Andersen rc = __vfs_removexattr(&init_user_ns, lower_dentry, name); 11174b899da5SAndreas Gruenbacher inode_unlock(lower_inode); 1118237fead6SMichael Halcrow out: 1119237fead6SMichael Halcrow return rc; 1120237fead6SMichael Halcrow } 1121237fead6SMichael Halcrow 1122*97e2dee9SMiklos Szeredi static int ecryptfs_fileattr_get(struct dentry *dentry, struct fileattr *fa) 1123*97e2dee9SMiklos Szeredi { 1124*97e2dee9SMiklos Szeredi return vfs_fileattr_get(ecryptfs_dentry_to_lower(dentry), fa); 1125*97e2dee9SMiklos Szeredi } 1126*97e2dee9SMiklos Szeredi 1127*97e2dee9SMiklos Szeredi static int ecryptfs_fileattr_set(struct user_namespace *mnt_userns, 1128*97e2dee9SMiklos Szeredi struct dentry *dentry, struct fileattr *fa) 1129*97e2dee9SMiklos Szeredi { 1130*97e2dee9SMiklos Szeredi struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 1131*97e2dee9SMiklos Szeredi int rc; 1132*97e2dee9SMiklos Szeredi 1133*97e2dee9SMiklos Szeredi rc = vfs_fileattr_set(&init_user_ns, lower_dentry, fa); 1134*97e2dee9SMiklos Szeredi fsstack_copy_attr_all(d_inode(dentry), d_inode(lower_dentry)); 1135*97e2dee9SMiklos Szeredi 1136*97e2dee9SMiklos Szeredi return rc; 1137*97e2dee9SMiklos Szeredi } 1138*97e2dee9SMiklos Szeredi 1139754661f1SArjan van de Ven const struct inode_operations ecryptfs_symlink_iops = { 11406b255391SAl Viro .get_link = ecryptfs_get_link, 1141237fead6SMichael Halcrow .permission = ecryptfs_permission, 1142237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 11433a60a168STyler Hicks .getattr = ecryptfs_getattr_link, 1144237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1145237fead6SMichael Halcrow }; 1146237fead6SMichael Halcrow 1147754661f1SArjan van de Ven const struct inode_operations ecryptfs_dir_iops = { 1148237fead6SMichael Halcrow .create = ecryptfs_create, 1149237fead6SMichael Halcrow .lookup = ecryptfs_lookup, 1150237fead6SMichael Halcrow .link = ecryptfs_link, 1151237fead6SMichael Halcrow .unlink = ecryptfs_unlink, 1152237fead6SMichael Halcrow .symlink = ecryptfs_symlink, 1153237fead6SMichael Halcrow .mkdir = ecryptfs_mkdir, 1154237fead6SMichael Halcrow .rmdir = ecryptfs_rmdir, 1155237fead6SMichael Halcrow .mknod = ecryptfs_mknod, 1156237fead6SMichael Halcrow .rename = ecryptfs_rename, 1157237fead6SMichael Halcrow .permission = ecryptfs_permission, 1158237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1159237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1160*97e2dee9SMiklos Szeredi .fileattr_get = ecryptfs_fileattr_get, 1161*97e2dee9SMiklos Szeredi .fileattr_set = ecryptfs_fileattr_set, 1162237fead6SMichael Halcrow }; 1163237fead6SMichael Halcrow 1164754661f1SArjan van de Ven const struct inode_operations ecryptfs_main_iops = { 1165237fead6SMichael Halcrow .permission = ecryptfs_permission, 1166237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1167f8f484d1STyler Hicks .getattr = ecryptfs_getattr, 1168237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1169*97e2dee9SMiklos Szeredi .fileattr_get = ecryptfs_fileattr_get, 1170*97e2dee9SMiklos Szeredi .fileattr_set = ecryptfs_fileattr_set, 11714b899da5SAndreas Gruenbacher }; 11724b899da5SAndreas Gruenbacher 11734b899da5SAndreas Gruenbacher static int ecryptfs_xattr_get(const struct xattr_handler *handler, 11744b899da5SAndreas Gruenbacher struct dentry *dentry, struct inode *inode, 11754b899da5SAndreas Gruenbacher const char *name, void *buffer, size_t size) 11764b899da5SAndreas Gruenbacher { 11774b899da5SAndreas Gruenbacher return ecryptfs_getxattr(dentry, inode, name, buffer, size); 11784b899da5SAndreas Gruenbacher } 11794b899da5SAndreas Gruenbacher 11804b899da5SAndreas Gruenbacher static int ecryptfs_xattr_set(const struct xattr_handler *handler, 1181e65ce2a5SChristian Brauner struct user_namespace *mnt_userns, 11824b899da5SAndreas Gruenbacher struct dentry *dentry, struct inode *inode, 11834b899da5SAndreas Gruenbacher const char *name, const void *value, size_t size, 11844b899da5SAndreas Gruenbacher int flags) 11854b899da5SAndreas Gruenbacher { 11864b899da5SAndreas Gruenbacher if (value) 11874b899da5SAndreas Gruenbacher return ecryptfs_setxattr(dentry, inode, name, value, size, flags); 11884b899da5SAndreas Gruenbacher else { 11894b899da5SAndreas Gruenbacher BUG_ON(flags != XATTR_REPLACE); 11904b899da5SAndreas Gruenbacher return ecryptfs_removexattr(dentry, inode, name); 11914b899da5SAndreas Gruenbacher } 11924b899da5SAndreas Gruenbacher } 11934b899da5SAndreas Gruenbacher 1194c036061bSYueHaibing static const struct xattr_handler ecryptfs_xattr_handler = { 11954b899da5SAndreas Gruenbacher .prefix = "", /* match anything */ 11964b899da5SAndreas Gruenbacher .get = ecryptfs_xattr_get, 11974b899da5SAndreas Gruenbacher .set = ecryptfs_xattr_set, 11984b899da5SAndreas Gruenbacher }; 11994b899da5SAndreas Gruenbacher 12004b899da5SAndreas Gruenbacher const struct xattr_handler *ecryptfs_xattr_handlers[] = { 12014b899da5SAndreas Gruenbacher &ecryptfs_xattr_handler, 12024b899da5SAndreas Gruenbacher NULL 1203237fead6SMichael Halcrow }; 1204