11a59d1b8SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 2d17074acSLee Jones /* 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> 21af84016fSChristian Brauner #include <linux/posix_acl.h> 22af84016fSChristian Brauner #include <linux/posix_acl_xattr.h> 2397e2dee9SMiklos Szeredi #include <linux/fileattr.h> 240a688ad7SHarvey Harrison #include <asm/unaligned.h> 25237fead6SMichael Halcrow #include "ecryptfs_kernel.h" 26237fead6SMichael Halcrow 27b2648d51SAl Viro static int lock_parent(struct dentry *dentry, 28b2648d51SAl Viro struct dentry **lower_dentry, 29b2648d51SAl Viro struct inode **lower_dir) 30237fead6SMichael Halcrow { 31b2648d51SAl Viro struct dentry *lower_dir_dentry; 32237fead6SMichael Halcrow 33b2648d51SAl Viro lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent); 34b2648d51SAl Viro *lower_dir = d_inode(lower_dir_dentry); 35b2648d51SAl Viro *lower_dentry = ecryptfs_dentry_to_lower(dentry); 36237fead6SMichael Halcrow 37b2648d51SAl Viro inode_lock_nested(*lower_dir, I_MUTEX_PARENT); 38b2648d51SAl Viro return (*lower_dentry)->d_parent == lower_dir_dentry ? 0 : -EINVAL; 39237fead6SMichael Halcrow } 40237fead6SMichael Halcrow 41c4f79073STyler Hicks static int ecryptfs_inode_test(struct inode *inode, void *lower_inode) 42c4f79073STyler Hicks { 43c4cf3ba4SHimangi Saraogi return ecryptfs_inode_to_lower(inode) == lower_inode; 44c4f79073STyler Hicks } 45c4f79073STyler Hicks 465ccf9203STyler Hicks static int ecryptfs_inode_set(struct inode *inode, void *opaque) 47c4f79073STyler Hicks { 485ccf9203STyler Hicks struct inode *lower_inode = opaque; 495ccf9203STyler Hicks 505ccf9203STyler Hicks ecryptfs_set_inode_lower(inode, lower_inode); 515ccf9203STyler Hicks fsstack_copy_attr_all(inode, lower_inode); 525ccf9203STyler Hicks /* i_size will be overwritten for encrypted regular files */ 535ccf9203STyler Hicks fsstack_copy_inode_size(inode, lower_inode); 545ccf9203STyler Hicks inode->i_ino = lower_inode->i_ino; 55c4f79073STyler Hicks inode->i_mapping->a_ops = &ecryptfs_aops; 565ccf9203STyler Hicks 575ccf9203STyler Hicks if (S_ISLNK(inode->i_mode)) 585ccf9203STyler Hicks inode->i_op = &ecryptfs_symlink_iops; 595ccf9203STyler Hicks else if (S_ISDIR(inode->i_mode)) 605ccf9203STyler Hicks inode->i_op = &ecryptfs_dir_iops; 615ccf9203STyler Hicks else 625ccf9203STyler Hicks inode->i_op = &ecryptfs_main_iops; 635ccf9203STyler Hicks 645ccf9203STyler Hicks if (S_ISDIR(inode->i_mode)) 655ccf9203STyler Hicks inode->i_fop = &ecryptfs_dir_fops; 665ccf9203STyler Hicks else if (special_file(inode->i_mode)) 675ccf9203STyler Hicks init_special_inode(inode, inode->i_mode, inode->i_rdev); 685ccf9203STyler Hicks else 695ccf9203STyler Hicks inode->i_fop = &ecryptfs_main_fops; 705ccf9203STyler Hicks 71c4f79073STyler Hicks return 0; 72c4f79073STyler Hicks } 73c4f79073STyler Hicks 745ccf9203STyler Hicks static struct inode *__ecryptfs_get_inode(struct inode *lower_inode, 755ccf9203STyler Hicks struct super_block *sb) 765ccf9203STyler Hicks { 775ccf9203STyler Hicks struct inode *inode; 785ccf9203STyler Hicks 795ccf9203STyler Hicks if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) 805ccf9203STyler Hicks return ERR_PTR(-EXDEV); 815ccf9203STyler Hicks if (!igrab(lower_inode)) 825ccf9203STyler Hicks return ERR_PTR(-ESTALE); 835ccf9203STyler Hicks inode = iget5_locked(sb, (unsigned long)lower_inode, 845ccf9203STyler Hicks ecryptfs_inode_test, ecryptfs_inode_set, 855ccf9203STyler Hicks lower_inode); 865ccf9203STyler Hicks if (!inode) { 875ccf9203STyler Hicks iput(lower_inode); 885ccf9203STyler Hicks return ERR_PTR(-EACCES); 895ccf9203STyler Hicks } 905ccf9203STyler Hicks if (!(inode->i_state & I_NEW)) 915ccf9203STyler Hicks iput(lower_inode); 925ccf9203STyler Hicks 935ccf9203STyler Hicks return inode; 945ccf9203STyler Hicks } 955ccf9203STyler Hicks 96c4f79073STyler Hicks struct inode *ecryptfs_get_inode(struct inode *lower_inode, 97c4f79073STyler Hicks struct super_block *sb) 98c4f79073STyler Hicks { 995ccf9203STyler Hicks struct inode *inode = __ecryptfs_get_inode(lower_inode, sb); 100c4f79073STyler Hicks 1015ccf9203STyler Hicks if (!IS_ERR(inode) && (inode->i_state & I_NEW)) 102c4f79073STyler Hicks unlock_new_inode(inode); 1035ccf9203STyler Hicks 104c4f79073STyler Hicks return inode; 105c4f79073STyler Hicks } 106c4f79073STyler Hicks 107c4f79073STyler Hicks /** 108c4f79073STyler Hicks * ecryptfs_interpose 109c4f79073STyler Hicks * @lower_dentry: Existing dentry in the lower filesystem 110c4f79073STyler Hicks * @dentry: ecryptfs' dentry 111c4f79073STyler Hicks * @sb: ecryptfs's super_block 112c4f79073STyler Hicks * 113c4f79073STyler Hicks * Interposes upper and lower dentries. 114c4f79073STyler Hicks * 115c4f79073STyler Hicks * Returns zero on success; non-zero otherwise 116c4f79073STyler Hicks */ 117c4f79073STyler Hicks static int ecryptfs_interpose(struct dentry *lower_dentry, 1185ccf9203STyler Hicks struct dentry *dentry, struct super_block *sb) 119c4f79073STyler Hicks { 1202b0143b5SDavid Howells struct inode *inode = ecryptfs_get_inode(d_inode(lower_dentry), sb); 1215ccf9203STyler Hicks 122c4f79073STyler Hicks if (IS_ERR(inode)) 123c4f79073STyler Hicks return PTR_ERR(inode); 124c4f79073STyler Hicks d_instantiate(dentry, inode); 1255ccf9203STyler Hicks 126c4f79073STyler Hicks return 0; 127c4f79073STyler Hicks } 128c4f79073STyler Hicks 1298bc2d3cfSTyler Hicks static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry, 1308bc2d3cfSTyler Hicks struct inode *inode) 1318bc2d3cfSTyler Hicks { 132b2648d51SAl Viro struct dentry *lower_dentry; 133b2648d51SAl Viro struct inode *lower_dir; 1348bc2d3cfSTyler Hicks int rc; 1358bc2d3cfSTyler Hicks 136b2648d51SAl Viro rc = lock_parent(dentry, &lower_dentry, &lower_dir); 137bcf0d9d4SAl Viro dget(lower_dentry); // don't even try to make the lower negative 138b2648d51SAl Viro if (!rc) { 139b2648d51SAl Viro if (d_unhashed(lower_dentry)) 140bcf0d9d4SAl Viro rc = -EINVAL; 141bcf0d9d4SAl Viro else 142abf08576SChristian Brauner rc = vfs_unlink(&nop_mnt_idmap, lower_dir, lower_dentry, 1436521f891SChristian Brauner NULL); 144b2648d51SAl Viro } 1458bc2d3cfSTyler Hicks if (rc) { 1468bc2d3cfSTyler Hicks printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); 1478bc2d3cfSTyler Hicks goto out_unlock; 1488bc2d3cfSTyler Hicks } 149b2648d51SAl Viro fsstack_copy_attr_times(dir, lower_dir); 1508bc2d3cfSTyler Hicks set_nlink(inode, ecryptfs_inode_to_lower(inode)->i_nlink); 1518bc2d3cfSTyler Hicks inode->i_ctime = dir->i_ctime; 1528bc2d3cfSTyler Hicks out_unlock: 1538bc2d3cfSTyler Hicks dput(lower_dentry); 154b2648d51SAl Viro inode_unlock(lower_dir); 155bcf0d9d4SAl Viro if (!rc) 156bcf0d9d4SAl Viro d_drop(dentry); 1578bc2d3cfSTyler Hicks return rc; 1588bc2d3cfSTyler Hicks } 1598bc2d3cfSTyler Hicks 160237fead6SMichael Halcrow /** 161237fead6SMichael Halcrow * ecryptfs_do_create 162237fead6SMichael Halcrow * @directory_inode: inode of the new file's dentry's parent in ecryptfs 163237fead6SMichael Halcrow * @ecryptfs_dentry: New file's dentry in ecryptfs 164237fead6SMichael Halcrow * @mode: The mode of the new file 165237fead6SMichael Halcrow * 166237fead6SMichael Halcrow * Creates the underlying file and the eCryptfs inode which will link to 167237fead6SMichael Halcrow * it. It will also update the eCryptfs directory inode to mimic the 168237fead6SMichael Halcrow * stat of the lower directory inode. 169237fead6SMichael Halcrow * 170b59db43aSTyler Hicks * Returns the new eCryptfs inode on success; an ERR_PTR on error condition 171237fead6SMichael Halcrow */ 172b59db43aSTyler Hicks static struct inode * 173237fead6SMichael Halcrow ecryptfs_do_create(struct inode *directory_inode, 174175a4eb7SAl Viro struct dentry *ecryptfs_dentry, umode_t mode) 175237fead6SMichael Halcrow { 176237fead6SMichael Halcrow int rc; 177237fead6SMichael Halcrow struct dentry *lower_dentry; 178b2648d51SAl Viro struct inode *lower_dir; 179b59db43aSTyler Hicks struct inode *inode; 180237fead6SMichael Halcrow 181b2648d51SAl Viro rc = lock_parent(ecryptfs_dentry, &lower_dentry, &lower_dir); 182b2648d51SAl Viro if (!rc) 183abf08576SChristian Brauner rc = vfs_create(&nop_mnt_idmap, lower_dir, 184b2648d51SAl Viro lower_dentry, mode, true); 1854981e081SMichael Halcrow if (rc) { 186caeeeecfSMichael Halcrow printk(KERN_ERR "%s: Failure to create dentry in lower fs; " 18718d1dbf1SHarvey Harrison "rc = [%d]\n", __func__, rc); 188b59db43aSTyler Hicks inode = ERR_PTR(rc); 189237fead6SMichael Halcrow goto out_lock; 190237fead6SMichael Halcrow } 1912b0143b5SDavid Howells inode = __ecryptfs_get_inode(d_inode(lower_dentry), 1925ccf9203STyler Hicks directory_inode->i_sb); 1938bc2d3cfSTyler Hicks if (IS_ERR(inode)) { 194abf08576SChristian Brauner vfs_unlink(&nop_mnt_idmap, lower_dir, lower_dentry, NULL); 195237fead6SMichael Halcrow goto out_lock; 1968bc2d3cfSTyler Hicks } 197b2648d51SAl Viro fsstack_copy_attr_times(directory_inode, lower_dir); 198b2648d51SAl Viro fsstack_copy_inode_size(directory_inode, lower_dir); 199237fead6SMichael Halcrow out_lock: 200b2648d51SAl Viro inode_unlock(lower_dir); 201b59db43aSTyler Hicks return inode; 202237fead6SMichael Halcrow } 203237fead6SMichael Halcrow 204d17074acSLee Jones /* 205237fead6SMichael Halcrow * ecryptfs_initialize_file 206237fead6SMichael Halcrow * 207237fead6SMichael Halcrow * Cause the file to be changed from a basic empty file to an ecryptfs 208237fead6SMichael Halcrow * file with a header and first data page. 209237fead6SMichael Halcrow * 210237fead6SMichael Halcrow * Returns zero on success 211237fead6SMichael Halcrow */ 212e3ccaa97STyler Hicks int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry, 213b59db43aSTyler Hicks struct inode *ecryptfs_inode) 214237fead6SMichael Halcrow { 215d7cdc5feSMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat = 216b59db43aSTyler Hicks &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat; 217237fead6SMichael Halcrow int rc = 0; 218237fead6SMichael Halcrow 219b59db43aSTyler Hicks if (S_ISDIR(ecryptfs_inode->i_mode)) { 220237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); 221e2bd99ecSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 222d7cdc5feSMichael Halcrow goto out; 223237fead6SMichael Halcrow } 224237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); 225b59db43aSTyler Hicks rc = ecryptfs_new_file_context(ecryptfs_inode); 226237fead6SMichael Halcrow if (rc) { 227d7cdc5feSMichael Halcrow ecryptfs_printk(KERN_ERR, "Error creating new file " 228d7cdc5feSMichael Halcrow "context; rc = [%d]\n", rc); 229d7cdc5feSMichael Halcrow goto out; 230237fead6SMichael Halcrow } 231b59db43aSTyler Hicks rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode); 232391b52f9SMichael Halcrow if (rc) { 233391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 234332ab16fSTyler Hicks "the lower file for the dentry with name " 2359e78d14aSDavid Howells "[%pd]; rc = [%d]\n", __func__, 2369e78d14aSDavid Howells ecryptfs_dentry, rc); 237391b52f9SMichael Halcrow goto out; 238391b52f9SMichael Halcrow } 239b59db43aSTyler Hicks rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode); 240332ab16fSTyler Hicks if (rc) 241d7cdc5feSMichael Halcrow printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); 242b59db43aSTyler Hicks ecryptfs_put_lower_file(ecryptfs_inode); 243237fead6SMichael Halcrow out: 244237fead6SMichael Halcrow return rc; 245237fead6SMichael Halcrow } 246237fead6SMichael Halcrow 247d17074acSLee Jones /* 248237fead6SMichael Halcrow * ecryptfs_create 249237fead6SMichael Halcrow * @mode: The mode of the new file. 250237fead6SMichael Halcrow * 251237fead6SMichael Halcrow * Creates a new file. 252237fead6SMichael Halcrow * 253237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 254237fead6SMichael Halcrow */ 255237fead6SMichael Halcrow static int 2566c960e68SChristian Brauner ecryptfs_create(struct mnt_idmap *idmap, 257549c7297SChristian Brauner struct inode *directory_inode, struct dentry *ecryptfs_dentry, 258ebfc3b49SAl Viro umode_t mode, bool excl) 259237fead6SMichael Halcrow { 260b59db43aSTyler Hicks struct inode *ecryptfs_inode; 261237fead6SMichael Halcrow int rc; 262237fead6SMichael Halcrow 263b59db43aSTyler Hicks ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry, 264b59db43aSTyler Hicks mode); 265a1c83681SViresh Kumar if (IS_ERR(ecryptfs_inode)) { 266237fead6SMichael Halcrow ecryptfs_printk(KERN_WARNING, "Failed to create file in" 267237fead6SMichael Halcrow "lower filesystem\n"); 268b59db43aSTyler Hicks rc = PTR_ERR(ecryptfs_inode); 269237fead6SMichael Halcrow goto out; 270237fead6SMichael Halcrow } 271237fead6SMichael Halcrow /* At this point, a file exists on "disk"; we need to make sure 272237fead6SMichael Halcrow * that this on disk file is prepared to be an ecryptfs file */ 273b59db43aSTyler Hicks rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode); 274b59db43aSTyler Hicks if (rc) { 2758bc2d3cfSTyler Hicks ecryptfs_do_unlink(directory_inode, ecryptfs_dentry, 2768bc2d3cfSTyler Hicks ecryptfs_inode); 2770e81ba23SAl Viro iget_failed(ecryptfs_inode); 278b59db43aSTyler Hicks goto out; 279b59db43aSTyler Hicks } 2801e2e547aSAl Viro d_instantiate_new(ecryptfs_dentry, ecryptfs_inode); 281237fead6SMichael Halcrow out: 282237fead6SMichael Halcrow return rc; 283237fead6SMichael Halcrow } 284237fead6SMichael Halcrow 285778aeb42STyler Hicks static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode) 286237fead6SMichael Halcrow { 2872aac0cf8STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 288778aeb42STyler Hicks int rc; 289237fead6SMichael Halcrow 290778aeb42STyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 291391b52f9SMichael Halcrow if (rc) { 292391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 293332ab16fSTyler Hicks "the lower file for the dentry with name " 2949e78d14aSDavid Howells "[%pd]; rc = [%d]\n", __func__, 2959e78d14aSDavid Howells dentry, rc); 296778aeb42STyler Hicks return rc; 297391b52f9SMichael Halcrow } 298778aeb42STyler Hicks 2993b06b3ebSTyler Hicks crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; 3002aac0cf8STyler Hicks /* TODO: lock for crypt_stat comparison */ 3012aac0cf8STyler Hicks if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) 3022aac0cf8STyler Hicks ecryptfs_set_default_sizes(crypt_stat); 303778aeb42STyler Hicks 304778aeb42STyler Hicks rc = ecryptfs_read_and_validate_header_region(inode); 305778aeb42STyler Hicks ecryptfs_put_lower_file(inode); 306237fead6SMichael Halcrow if (rc) { 307778aeb42STyler Hicks rc = ecryptfs_read_and_validate_xattr_region(dentry, inode); 308778aeb42STyler Hicks if (!rc) 309dd2a3b7aSMichael Halcrow crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; 310dd2a3b7aSMichael Halcrow } 311778aeb42STyler Hicks 312778aeb42STyler Hicks /* Must return 0 to allow non-eCryptfs files to be looked up, too */ 313778aeb42STyler Hicks return 0; 314778aeb42STyler Hicks } 315778aeb42STyler Hicks 316d17074acSLee Jones /* 317778aeb42STyler Hicks * ecryptfs_lookup_interpose - Dentry interposition for a lookup 318778aeb42STyler Hicks */ 319b1168a92SAl Viro static struct dentry *ecryptfs_lookup_interpose(struct dentry *dentry, 320b1168a92SAl Viro struct dentry *lower_dentry) 321778aeb42STyler Hicks { 32288569546SAl Viro const struct path *path = ecryptfs_dentry_to_lower_path(dentry->d_parent); 323e72b9dd6SAl Viro struct inode *inode, *lower_inode; 324778aeb42STyler Hicks struct ecryptfs_dentry_info *dentry_info; 325778aeb42STyler Hicks int rc = 0; 326778aeb42STyler Hicks 327778aeb42STyler Hicks dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); 328778aeb42STyler Hicks if (!dentry_info) { 329237fead6SMichael Halcrow dput(lower_dentry); 330b1168a92SAl Viro return ERR_PTR(-ENOMEM); 331778aeb42STyler Hicks } 3320b1d9011SAl Viro 333b1168a92SAl Viro fsstack_copy_attr_atime(d_inode(dentry->d_parent), 334762c6968SAl Viro d_inode(path->dentry)); 33584d08fa8SAl Viro BUG_ON(!d_count(lower_dentry)); 3360b1d9011SAl Viro 3370b1d9011SAl Viro ecryptfs_set_dentry_private(dentry, dentry_info); 338762c6968SAl Viro dentry_info->lower_path.mnt = mntget(path->mnt); 33992dd1230SAl Viro dentry_info->lower_path.dentry = lower_dentry; 340778aeb42STyler Hicks 341e72b9dd6SAl Viro /* 342e72b9dd6SAl Viro * negative dentry can go positive under us here - its parent is not 343e72b9dd6SAl Viro * locked. That's OK and that could happen just as we return from 344e72b9dd6SAl Viro * ecryptfs_lookup() anyway. Just need to be careful and fetch 345e72b9dd6SAl Viro * ->d_inode only once - it's not stable here. 346e72b9dd6SAl Viro */ 347e72b9dd6SAl Viro lower_inode = READ_ONCE(lower_dentry->d_inode); 348e72b9dd6SAl Viro 349e72b9dd6SAl Viro if (!lower_inode) { 350778aeb42STyler Hicks /* We want to add because we couldn't find in lower */ 351778aeb42STyler Hicks d_add(dentry, NULL); 352b1168a92SAl Viro return NULL; 353778aeb42STyler Hicks } 354b1168a92SAl Viro inode = __ecryptfs_get_inode(lower_inode, dentry->d_sb); 355778aeb42STyler Hicks if (IS_ERR(inode)) { 356778aeb42STyler Hicks printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n", 357778aeb42STyler Hicks __func__, PTR_ERR(inode)); 358b1168a92SAl Viro return ERR_CAST(inode); 359778aeb42STyler Hicks } 360778aeb42STyler Hicks if (S_ISREG(inode->i_mode)) { 361778aeb42STyler Hicks rc = ecryptfs_i_size_read(dentry, inode); 362778aeb42STyler Hicks if (rc) { 363778aeb42STyler Hicks make_bad_inode(inode); 364b1168a92SAl Viro return ERR_PTR(rc); 365778aeb42STyler Hicks } 366778aeb42STyler Hicks } 367778aeb42STyler Hicks 368778aeb42STyler Hicks if (inode->i_state & I_NEW) 369778aeb42STyler Hicks unlock_new_inode(inode); 370b1168a92SAl Viro return d_splice_alias(inode, dentry); 371addd65adSMichael Halcrow } 372addd65adSMichael Halcrow 373addd65adSMichael Halcrow /** 374addd65adSMichael Halcrow * ecryptfs_lookup 375addd65adSMichael Halcrow * @ecryptfs_dir_inode: The eCryptfs directory inode 376addd65adSMichael Halcrow * @ecryptfs_dentry: The eCryptfs dentry that we are looking up 37789076bc3SAl Viro * @flags: lookup flags 378addd65adSMichael Halcrow * 379addd65adSMichael Halcrow * Find a file on disk. If the file does not exist, then we'll add it to the 380addd65adSMichael Halcrow * dentry cache and continue on to read it from the disk. 381addd65adSMichael Halcrow */ 382addd65adSMichael Halcrow static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, 383addd65adSMichael Halcrow struct dentry *ecryptfs_dentry, 38400cd8dd3SAl Viro unsigned int flags) 385addd65adSMichael Halcrow { 386addd65adSMichael Halcrow char *encrypted_and_encoded_name = NULL; 38788ae4ab9SAl Viro struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 388addd65adSMichael Halcrow struct dentry *lower_dir_dentry, *lower_dentry; 38988ae4ab9SAl Viro const char *name = ecryptfs_dentry->d_name.name; 39088ae4ab9SAl Viro size_t len = ecryptfs_dentry->d_name.len; 391b1168a92SAl Viro struct dentry *res; 392addd65adSMichael Halcrow int rc = 0; 393addd65adSMichael Halcrow 394addd65adSMichael Halcrow lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); 39588ae4ab9SAl Viro 396addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 397addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 398ab13a921SGuenter Roeck if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { 399addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename( 40088ae4ab9SAl Viro &encrypted_and_encoded_name, &len, 40188ae4ab9SAl Viro mount_crypt_stat, name, len); 402addd65adSMichael Halcrow if (rc) { 403addd65adSMichael Halcrow printk(KERN_ERR "%s: Error attempting to encrypt and encode " 404addd65adSMichael Halcrow "filename; rc = [%d]\n", __func__, rc); 405237fead6SMichael Halcrow return ERR_PTR(rc); 406237fead6SMichael Halcrow } 40788ae4ab9SAl Viro name = encrypted_and_encoded_name; 40888ae4ab9SAl Viro } 40988ae4ab9SAl Viro 41088ae4ab9SAl Viro lower_dentry = lookup_one_len_unlocked(name, lower_dir_dentry, len); 411237fead6SMichael Halcrow if (IS_ERR(lower_dentry)) { 412237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 413b1168a92SAl Viro "[%ld] on lower_dentry = [%s]\n", __func__, 414b1168a92SAl Viro PTR_ERR(lower_dentry), 41588ae4ab9SAl Viro name); 416b1168a92SAl Viro res = ERR_CAST(lower_dentry); 41788ae4ab9SAl Viro } else { 418b1168a92SAl Viro res = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry); 41988ae4ab9SAl Viro } 420237fead6SMichael Halcrow kfree(encrypted_and_encoded_name); 421b1168a92SAl Viro return res; 422237fead6SMichael Halcrow } 423237fead6SMichael Halcrow 424237fead6SMichael Halcrow static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, 425237fead6SMichael Halcrow struct dentry *new_dentry) 426237fead6SMichael Halcrow { 427237fead6SMichael Halcrow struct dentry *lower_old_dentry; 428237fead6SMichael Halcrow struct dentry *lower_new_dentry; 429b2648d51SAl Viro struct inode *lower_dir; 430237fead6SMichael Halcrow u64 file_size_save; 431237fead6SMichael Halcrow int rc; 432237fead6SMichael Halcrow 4332b0143b5SDavid Howells file_size_save = i_size_read(d_inode(old_dentry)); 434237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 435b2648d51SAl Viro rc = lock_parent(new_dentry, &lower_new_dentry, &lower_dir); 436b2648d51SAl Viro if (!rc) 437abf08576SChristian Brauner rc = vfs_link(lower_old_dentry, &nop_mnt_idmap, lower_dir, 438b2648d51SAl Viro lower_new_dentry, NULL); 4392b0143b5SDavid Howells if (rc || d_really_is_negative(lower_new_dentry)) 440237fead6SMichael Halcrow goto out_lock; 4415ccf9203STyler Hicks rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); 442237fead6SMichael Halcrow if (rc) 443237fead6SMichael Halcrow goto out_lock; 444b2648d51SAl Viro fsstack_copy_attr_times(dir, lower_dir); 445b2648d51SAl Viro fsstack_copy_inode_size(dir, lower_dir); 4462b0143b5SDavid Howells set_nlink(d_inode(old_dentry), 4472b0143b5SDavid Howells ecryptfs_inode_to_lower(d_inode(old_dentry))->i_nlink); 4482b0143b5SDavid Howells i_size_write(d_inode(new_dentry), file_size_save); 449237fead6SMichael Halcrow out_lock: 450b2648d51SAl Viro inode_unlock(lower_dir); 451237fead6SMichael Halcrow return rc; 452237fead6SMichael Halcrow } 453237fead6SMichael Halcrow 454237fead6SMichael Halcrow static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) 455237fead6SMichael Halcrow { 4562b0143b5SDavid Howells return ecryptfs_do_unlink(dir, dentry, d_inode(dentry)); 457237fead6SMichael Halcrow } 458237fead6SMichael Halcrow 459*7a77db95SChristian Brauner static int ecryptfs_symlink(struct mnt_idmap *idmap, 460549c7297SChristian Brauner struct inode *dir, struct dentry *dentry, 461237fead6SMichael Halcrow const char *symname) 462237fead6SMichael Halcrow { 463237fead6SMichael Halcrow int rc; 464237fead6SMichael Halcrow struct dentry *lower_dentry; 465b2648d51SAl Viro struct inode *lower_dir; 466237fead6SMichael Halcrow char *encoded_symname; 467addd65adSMichael Halcrow size_t encoded_symlen; 468addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 469237fead6SMichael Halcrow 470b2648d51SAl Viro rc = lock_parent(dentry, &lower_dentry, &lower_dir); 471b2648d51SAl Viro if (rc) 472b2648d51SAl Viro goto out_lock; 473addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 474addd65adSMichael Halcrow dir->i_sb)->mount_crypt_stat; 475addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, 476addd65adSMichael Halcrow &encoded_symlen, 477addd65adSMichael Halcrow mount_crypt_stat, symname, 478addd65adSMichael Halcrow strlen(symname)); 479addd65adSMichael Halcrow if (rc) 480237fead6SMichael Halcrow goto out_lock; 481abf08576SChristian Brauner rc = vfs_symlink(&nop_mnt_idmap, lower_dir, lower_dentry, 482db2e747bSMiklos Szeredi encoded_symname); 483237fead6SMichael Halcrow kfree(encoded_symname); 4842b0143b5SDavid Howells if (rc || d_really_is_negative(lower_dentry)) 485237fead6SMichael Halcrow goto out_lock; 4865ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 487237fead6SMichael Halcrow if (rc) 488237fead6SMichael Halcrow goto out_lock; 489b2648d51SAl Viro fsstack_copy_attr_times(dir, lower_dir); 490b2648d51SAl Viro fsstack_copy_inode_size(dir, lower_dir); 491237fead6SMichael Halcrow out_lock: 492b2648d51SAl Viro inode_unlock(lower_dir); 4932b0143b5SDavid Howells if (d_really_is_negative(dentry)) 494237fead6SMichael Halcrow d_drop(dentry); 495237fead6SMichael Halcrow return rc; 496237fead6SMichael Halcrow } 497237fead6SMichael Halcrow 498549c7297SChristian Brauner static int ecryptfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir, 499549c7297SChristian Brauner struct dentry *dentry, umode_t mode) 500237fead6SMichael Halcrow { 501237fead6SMichael Halcrow int rc; 502237fead6SMichael Halcrow struct dentry *lower_dentry; 503b2648d51SAl Viro struct inode *lower_dir; 504237fead6SMichael Halcrow 505b2648d51SAl Viro rc = lock_parent(dentry, &lower_dentry, &lower_dir); 506b2648d51SAl Viro if (!rc) 507abf08576SChristian Brauner rc = vfs_mkdir(&nop_mnt_idmap, lower_dir, 508b2648d51SAl Viro lower_dentry, mode); 5092b0143b5SDavid Howells if (rc || d_really_is_negative(lower_dentry)) 510237fead6SMichael Halcrow goto out; 5115ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 512237fead6SMichael Halcrow if (rc) 513237fead6SMichael Halcrow goto out; 514b2648d51SAl Viro fsstack_copy_attr_times(dir, lower_dir); 515b2648d51SAl Viro fsstack_copy_inode_size(dir, lower_dir); 516b2648d51SAl Viro set_nlink(dir, lower_dir->i_nlink); 517237fead6SMichael Halcrow out: 518b2648d51SAl Viro inode_unlock(lower_dir); 5192b0143b5SDavid Howells if (d_really_is_negative(dentry)) 520237fead6SMichael Halcrow d_drop(dentry); 521237fead6SMichael Halcrow return rc; 522237fead6SMichael Halcrow } 523237fead6SMichael Halcrow 524237fead6SMichael Halcrow static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) 525237fead6SMichael Halcrow { 526237fead6SMichael Halcrow struct dentry *lower_dentry; 527b2648d51SAl Viro struct inode *lower_dir; 52845ec4abaSMichael Halcrow int rc; 529237fead6SMichael Halcrow 530b2648d51SAl Viro rc = lock_parent(dentry, &lower_dentry, &lower_dir); 531bcf0d9d4SAl Viro dget(lower_dentry); // don't even try to make the lower negative 532b2648d51SAl Viro if (!rc) { 533b2648d51SAl Viro if (d_unhashed(lower_dentry)) 534bcf0d9d4SAl Viro rc = -EINVAL; 535bcf0d9d4SAl Viro else 536abf08576SChristian Brauner rc = vfs_rmdir(&nop_mnt_idmap, lower_dir, lower_dentry); 537b2648d51SAl Viro } 538bcf0d9d4SAl Viro if (!rc) { 5392b0143b5SDavid Howells clear_nlink(d_inode(dentry)); 540b2648d51SAl Viro fsstack_copy_attr_times(dir, lower_dir); 541b2648d51SAl Viro set_nlink(dir, lower_dir->i_nlink); 542bcf0d9d4SAl Viro } 543bcf0d9d4SAl Viro dput(lower_dentry); 544b2648d51SAl Viro inode_unlock(lower_dir); 545237fead6SMichael Halcrow if (!rc) 546237fead6SMichael Halcrow d_drop(dentry); 547237fead6SMichael Halcrow return rc; 548237fead6SMichael Halcrow } 549237fead6SMichael Halcrow 550237fead6SMichael Halcrow static int 551549c7297SChristian Brauner ecryptfs_mknod(struct user_namespace *mnt_userns, struct inode *dir, 552549c7297SChristian Brauner struct dentry *dentry, umode_t mode, dev_t dev) 553237fead6SMichael Halcrow { 554237fead6SMichael Halcrow int rc; 555237fead6SMichael Halcrow struct dentry *lower_dentry; 556b2648d51SAl Viro struct inode *lower_dir; 557237fead6SMichael Halcrow 558b2648d51SAl Viro rc = lock_parent(dentry, &lower_dentry, &lower_dir); 559b2648d51SAl Viro if (!rc) 560abf08576SChristian Brauner rc = vfs_mknod(&nop_mnt_idmap, lower_dir, 561b2648d51SAl Viro lower_dentry, mode, dev); 5622b0143b5SDavid Howells if (rc || d_really_is_negative(lower_dentry)) 563237fead6SMichael Halcrow goto out; 5645ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 565237fead6SMichael Halcrow if (rc) 566237fead6SMichael Halcrow goto out; 567b2648d51SAl Viro fsstack_copy_attr_times(dir, lower_dir); 568b2648d51SAl Viro fsstack_copy_inode_size(dir, lower_dir); 569237fead6SMichael Halcrow out: 570b2648d51SAl Viro inode_unlock(lower_dir); 5712b0143b5SDavid Howells if (d_really_is_negative(dentry)) 572237fead6SMichael Halcrow d_drop(dentry); 573237fead6SMichael Halcrow return rc; 574237fead6SMichael Halcrow } 575237fead6SMichael Halcrow 576237fead6SMichael Halcrow static int 577549c7297SChristian Brauner ecryptfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir, 578549c7297SChristian Brauner struct dentry *old_dentry, struct inode *new_dir, 579549c7297SChristian Brauner struct dentry *new_dentry, unsigned int flags) 580237fead6SMichael Halcrow { 581237fead6SMichael Halcrow int rc; 582237fead6SMichael Halcrow struct dentry *lower_old_dentry; 583237fead6SMichael Halcrow struct dentry *lower_new_dentry; 584237fead6SMichael Halcrow struct dentry *lower_old_dir_dentry; 585237fead6SMichael Halcrow struct dentry *lower_new_dir_dentry; 586bcf0d9d4SAl Viro struct dentry *trap; 5878335eafcSTyler Hicks struct inode *target_inode; 5889fe61450SChristian Brauner struct renamedata rd = {}; 589237fead6SMichael Halcrow 5901cd66c93SMiklos Szeredi if (flags) 5911cd66c93SMiklos Szeredi return -EINVAL; 5921cd66c93SMiklos Szeredi 593bcf0d9d4SAl Viro lower_old_dir_dentry = ecryptfs_dentry_to_lower(old_dentry->d_parent); 594bcf0d9d4SAl Viro lower_new_dir_dentry = ecryptfs_dentry_to_lower(new_dentry->d_parent); 595bcf0d9d4SAl Viro 596237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 597237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 598bcf0d9d4SAl Viro 5992b0143b5SDavid Howells target_inode = d_inode(new_dentry); 600bcf0d9d4SAl Viro 6010d132f73SErez Zadok trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 602bcf0d9d4SAl Viro dget(lower_new_dentry); 6030d132f73SErez Zadok rc = -EINVAL; 60474dd7c97SAl Viro if (lower_old_dentry->d_parent != lower_old_dir_dentry) 6050d132f73SErez Zadok goto out_lock; 60674dd7c97SAl Viro if (lower_new_dentry->d_parent != lower_new_dir_dentry) 60774dd7c97SAl Viro goto out_lock; 60874dd7c97SAl Viro if (d_unhashed(lower_old_dentry) || d_unhashed(lower_new_dentry)) 60974dd7c97SAl Viro goto out_lock; 61074dd7c97SAl Viro /* source should not be ancestor of target */ 61174dd7c97SAl Viro if (trap == lower_old_dentry) 61274dd7c97SAl Viro goto out_lock; 6130d132f73SErez Zadok /* target should not be ancestor of source */ 6140d132f73SErez Zadok if (trap == lower_new_dentry) { 6150d132f73SErez Zadok rc = -ENOTEMPTY; 6160d132f73SErez Zadok goto out_lock; 6170d132f73SErez Zadok } 6189fe61450SChristian Brauner 619abf08576SChristian Brauner rd.old_mnt_idmap = &nop_mnt_idmap; 6209fe61450SChristian Brauner rd.old_dir = d_inode(lower_old_dir_dentry); 6219fe61450SChristian Brauner rd.old_dentry = lower_old_dentry; 622abf08576SChristian Brauner rd.new_mnt_idmap = &nop_mnt_idmap; 6239fe61450SChristian Brauner rd.new_dir = d_inode(lower_new_dir_dentry); 6249fe61450SChristian Brauner rd.new_dentry = lower_new_dentry; 6259fe61450SChristian Brauner rc = vfs_rename(&rd); 626237fead6SMichael Halcrow if (rc) 627237fead6SMichael Halcrow goto out_lock; 6288335eafcSTyler Hicks if (target_inode) 6298335eafcSTyler Hicks fsstack_copy_attr_all(target_inode, 6308335eafcSTyler Hicks ecryptfs_inode_to_lower(target_inode)); 6312b0143b5SDavid Howells fsstack_copy_attr_all(new_dir, d_inode(lower_new_dir_dentry)); 632237fead6SMichael Halcrow if (new_dir != old_dir) 6332b0143b5SDavid Howells fsstack_copy_attr_all(old_dir, d_inode(lower_old_dir_dentry)); 634237fead6SMichael Halcrow out_lock: 635237fead6SMichael Halcrow dput(lower_new_dentry); 636bcf0d9d4SAl Viro unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 637237fead6SMichael Halcrow return rc; 638237fead6SMichael Halcrow } 639237fead6SMichael Halcrow 640b22e8fedSAl Viro static char *ecryptfs_readlink_lower(struct dentry *dentry, size_t *bufsiz) 641237fead6SMichael Halcrow { 6426c988f57SMiklos Szeredi DEFINE_DELAYED_CALL(done); 6433a60a168STyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 6446c988f57SMiklos Szeredi const char *link; 645b22e8fedSAl Viro char *buf; 646addd65adSMichael Halcrow int rc; 647237fead6SMichael Halcrow 6486c988f57SMiklos Szeredi link = vfs_get_link(lower_dentry, &done); 6496c988f57SMiklos Szeredi if (IS_ERR(link)) 6506c988f57SMiklos Szeredi return ERR_CAST(link); 6516c988f57SMiklos Szeredi 652b22e8fedSAl Viro rc = ecryptfs_decode_and_decrypt_filename(&buf, bufsiz, dentry->d_sb, 6536c988f57SMiklos Szeredi link, strlen(link)); 6546c988f57SMiklos Szeredi do_delayed_call(&done); 6556c988f57SMiklos Szeredi if (rc) 6566c988f57SMiklos Szeredi return ERR_PTR(rc); 6576c988f57SMiklos Szeredi 6586c988f57SMiklos Szeredi return buf; 6593a60a168STyler Hicks } 6603a60a168STyler Hicks 6616b255391SAl Viro static const char *ecryptfs_get_link(struct dentry *dentry, 662fceef393SAl Viro struct inode *inode, 663fceef393SAl Viro struct delayed_call *done) 664237fead6SMichael Halcrow { 665b22e8fedSAl Viro size_t len; 6666b255391SAl Viro char *buf; 6676b255391SAl Viro 6686b255391SAl Viro if (!dentry) 6696b255391SAl Viro return ERR_PTR(-ECHILD); 6706b255391SAl Viro 6716b255391SAl Viro buf = ecryptfs_readlink_lower(dentry, &len); 672b22e8fedSAl Viro if (IS_ERR(buf)) 673680baacbSAl Viro return buf; 6742b0143b5SDavid Howells fsstack_copy_attr_atime(d_inode(dentry), 6752b0143b5SDavid Howells d_inode(ecryptfs_dentry_to_lower(dentry))); 676408bd629SAl Viro buf[len] = '\0'; 677fceef393SAl Viro set_delayed_call(done, kfree_link, buf); 678fceef393SAl Viro return buf; 679237fead6SMichael Halcrow } 680237fead6SMichael Halcrow 681237fead6SMichael Halcrow /** 682237fead6SMichael Halcrow * upper_size_to_lower_size 683237fead6SMichael Halcrow * @crypt_stat: Crypt_stat associated with file 684237fead6SMichael Halcrow * @upper_size: Size of the upper file 685237fead6SMichael Halcrow * 686cc11beffSMichael Halcrow * Calculate the required size of the lower file based on the 687237fead6SMichael Halcrow * specified size of the upper file. This calculation is based on the 688237fead6SMichael Halcrow * number of headers in the underlying file and the extent size. 689237fead6SMichael Halcrow * 690237fead6SMichael Halcrow * Returns Calculated size of the lower file. 691237fead6SMichael Halcrow */ 692237fead6SMichael Halcrow static loff_t 693237fead6SMichael Halcrow upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, 694237fead6SMichael Halcrow loff_t upper_size) 695237fead6SMichael Halcrow { 696237fead6SMichael Halcrow loff_t lower_size; 697237fead6SMichael Halcrow 698157f1071STyler Hicks lower_size = ecryptfs_lower_header_size(crypt_stat); 699237fead6SMichael Halcrow if (upper_size != 0) { 700237fead6SMichael Halcrow loff_t num_extents; 701237fead6SMichael Halcrow 702237fead6SMichael Halcrow num_extents = upper_size >> crypt_stat->extent_shift; 703237fead6SMichael Halcrow if (upper_size & ~crypt_stat->extent_mask) 704237fead6SMichael Halcrow num_extents++; 705237fead6SMichael Halcrow lower_size += (num_extents * crypt_stat->extent_size); 706237fead6SMichael Halcrow } 707237fead6SMichael Halcrow return lower_size; 708237fead6SMichael Halcrow } 709237fead6SMichael Halcrow 710237fead6SMichael Halcrow /** 7115f3ef64fSTyler Hicks * truncate_upper 712237fead6SMichael Halcrow * @dentry: The ecryptfs layer dentry 7135f3ef64fSTyler Hicks * @ia: Address of the ecryptfs inode's attributes 7145f3ef64fSTyler Hicks * @lower_ia: Address of the lower inode's attributes 715237fead6SMichael Halcrow * 716237fead6SMichael Halcrow * Function to handle truncations modifying the size of the file. Note 717237fead6SMichael Halcrow * that the file sizes are interpolated. When expanding, we are simply 7185f3ef64fSTyler Hicks * writing strings of 0's out. When truncating, we truncate the upper 7195f3ef64fSTyler Hicks * inode and update the lower_ia according to the page index 7205f3ef64fSTyler Hicks * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, 7215f3ef64fSTyler Hicks * the caller must use lower_ia in a call to notify_change() to perform 7225f3ef64fSTyler Hicks * the truncation of the lower inode. 723237fead6SMichael Halcrow * 724237fead6SMichael Halcrow * Returns zero on success; non-zero otherwise 725237fead6SMichael Halcrow */ 7265f3ef64fSTyler Hicks static int truncate_upper(struct dentry *dentry, struct iattr *ia, 7275f3ef64fSTyler Hicks struct iattr *lower_ia) 728237fead6SMichael Halcrow { 729237fead6SMichael Halcrow int rc = 0; 7302b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 731237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 732237fead6SMichael Halcrow loff_t i_size = i_size_read(inode); 733237fead6SMichael Halcrow loff_t lower_size_before_truncate; 734237fead6SMichael Halcrow loff_t lower_size_after_truncate; 735237fead6SMichael Halcrow 7365f3ef64fSTyler Hicks if (unlikely((ia->ia_size == i_size))) { 7375f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 738332ab16fSTyler Hicks return 0; 7395f3ef64fSTyler Hicks } 7403b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 741332ab16fSTyler Hicks if (rc) 742332ab16fSTyler Hicks return rc; 7432b0143b5SDavid Howells crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; 744237fead6SMichael Halcrow /* Switch on growing or shrinking file */ 7455f3ef64fSTyler Hicks if (ia->ia_size > i_size) { 7462ed92554SMichael Halcrow char zero[] = { 0x00 }; 747240e2df5SMichael Halcrow 7485f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 7492ed92554SMichael Halcrow /* Write a single 0 at the last position of the file; 7502ed92554SMichael Halcrow * this triggers code that will fill in 0's throughout 7512ed92554SMichael Halcrow * the intermediate portion of the previous end of the 7522ed92554SMichael Halcrow * file and the new and of the file */ 75348c1e44aSAl Viro rc = ecryptfs_write(inode, zero, 7545f3ef64fSTyler Hicks (ia->ia_size - 1), 1); 7555f3ef64fSTyler Hicks } else { /* ia->ia_size < i_size_read(inode) */ 7565f3ef64fSTyler Hicks /* We're chopping off all the pages down to the page 7575f3ef64fSTyler Hicks * in which ia->ia_size is located. Fill in the end of 758ea1754a0SKirill A. Shutemov * that page from (ia->ia_size & ~PAGE_MASK) to 759ea1754a0SKirill A. Shutemov * PAGE_SIZE with zeros. */ 76009cbfeafSKirill A. Shutemov size_t num_zeros = (PAGE_SIZE 76109cbfeafSKirill A. Shutemov - (ia->ia_size & ~PAGE_MASK)); 7622ed92554SMichael Halcrow 7632c27c65eSChristoph Hellwig if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { 7642c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 7655f3ef64fSTyler Hicks lower_ia->ia_size = ia->ia_size; 7665f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 76748c1e44aSAl Viro goto out; 76813a791b4STyler Hicks } 7692ed92554SMichael Halcrow if (num_zeros) { 7702ed92554SMichael Halcrow char *zeros_virt; 7712ed92554SMichael Halcrow 7722ed92554SMichael Halcrow zeros_virt = kzalloc(num_zeros, GFP_KERNEL); 7732ed92554SMichael Halcrow if (!zeros_virt) { 7742ed92554SMichael Halcrow rc = -ENOMEM; 77548c1e44aSAl Viro goto out; 776240e2df5SMichael Halcrow } 77748c1e44aSAl Viro rc = ecryptfs_write(inode, zeros_virt, 7785f3ef64fSTyler Hicks ia->ia_size, num_zeros); 7792ed92554SMichael Halcrow kfree(zeros_virt); 7805dda6992SMichael Halcrow if (rc) { 781240e2df5SMichael Halcrow printk(KERN_ERR "Error attempting to zero out " 782240e2df5SMichael Halcrow "the remainder of the end page on " 783240e2df5SMichael Halcrow "reducing truncate; rc = [%d]\n", rc); 78448c1e44aSAl Viro goto out; 785240e2df5SMichael Halcrow } 786240e2df5SMichael Halcrow } 7872c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 7880216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 789dd2a3b7aSMichael Halcrow if (rc) { 790dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 791dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 792dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 79348c1e44aSAl Viro goto out; 794dd2a3b7aSMichael Halcrow } 795237fead6SMichael Halcrow /* We are reducing the size of the ecryptfs file, and need to 796237fead6SMichael Halcrow * know if we need to reduce the size of the lower file. */ 797237fead6SMichael Halcrow lower_size_before_truncate = 798237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, i_size); 799237fead6SMichael Halcrow lower_size_after_truncate = 8005f3ef64fSTyler Hicks upper_size_to_lower_size(crypt_stat, ia->ia_size); 8015f3ef64fSTyler Hicks if (lower_size_after_truncate < lower_size_before_truncate) { 8025f3ef64fSTyler Hicks lower_ia->ia_size = lower_size_after_truncate; 8035f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 8045f3ef64fSTyler Hicks } else 8055f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 806237fead6SMichael Halcrow } 807237fead6SMichael Halcrow out: 808332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 809237fead6SMichael Halcrow return rc; 810237fead6SMichael Halcrow } 811237fead6SMichael Halcrow 812a261a039STyler Hicks static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset) 813a261a039STyler Hicks { 814a261a039STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 815a261a039STyler Hicks loff_t lower_oldsize, lower_newsize; 816a261a039STyler Hicks 817a261a039STyler Hicks crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; 818a261a039STyler Hicks lower_oldsize = upper_size_to_lower_size(crypt_stat, 819a261a039STyler Hicks i_size_read(inode)); 820a261a039STyler Hicks lower_newsize = upper_size_to_lower_size(crypt_stat, offset); 821a261a039STyler Hicks if (lower_newsize > lower_oldsize) { 822a261a039STyler Hicks /* 823a261a039STyler Hicks * The eCryptfs inode and the new *lower* size are mixed here 824a261a039STyler Hicks * because we may not have the lower i_mutex held and/or it may 825a261a039STyler Hicks * not be appropriate to call inode_newsize_ok() with inodes 826a261a039STyler Hicks * from other filesystems. 827a261a039STyler Hicks */ 828a261a039STyler Hicks return inode_newsize_ok(inode, lower_newsize); 829a261a039STyler Hicks } 830a261a039STyler Hicks 831a261a039STyler Hicks return 0; 832a261a039STyler Hicks } 833a261a039STyler Hicks 8345f3ef64fSTyler Hicks /** 8355f3ef64fSTyler Hicks * ecryptfs_truncate 8365f3ef64fSTyler Hicks * @dentry: The ecryptfs layer dentry 8375f3ef64fSTyler Hicks * @new_length: The length to expand the file to 8385f3ef64fSTyler Hicks * 8395f3ef64fSTyler Hicks * Simple function that handles the truncation of an eCryptfs inode and 8405f3ef64fSTyler Hicks * its corresponding lower inode. 8415f3ef64fSTyler Hicks * 8425f3ef64fSTyler Hicks * Returns zero on success; non-zero otherwise 8435f3ef64fSTyler Hicks */ 8445f3ef64fSTyler Hicks int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) 8455f3ef64fSTyler Hicks { 8465f3ef64fSTyler Hicks struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; 8475f3ef64fSTyler Hicks struct iattr lower_ia = { .ia_valid = 0 }; 8485f3ef64fSTyler Hicks int rc; 8495f3ef64fSTyler Hicks 8502b0143b5SDavid Howells rc = ecryptfs_inode_newsize_ok(d_inode(dentry), new_length); 851a261a039STyler Hicks if (rc) 852a261a039STyler Hicks return rc; 853a261a039STyler Hicks 8545f3ef64fSTyler Hicks rc = truncate_upper(dentry, &ia, &lower_ia); 8555f3ef64fSTyler Hicks if (!rc && lower_ia.ia_valid & ATTR_SIZE) { 8565f3ef64fSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 8575f3ef64fSTyler Hicks 8585955102cSAl Viro inode_lock(d_inode(lower_dentry)); 859abf08576SChristian Brauner rc = notify_change(&nop_mnt_idmap, lower_dentry, 8602f221d6fSChristian Brauner &lower_ia, NULL); 8615955102cSAl Viro inode_unlock(d_inode(lower_dentry)); 8625f3ef64fSTyler Hicks } 8635f3ef64fSTyler Hicks return rc; 8645f3ef64fSTyler Hicks } 8655f3ef64fSTyler Hicks 866237fead6SMichael Halcrow static int 867549c7297SChristian Brauner ecryptfs_permission(struct user_namespace *mnt_userns, struct inode *inode, 868549c7297SChristian Brauner int mask) 869237fead6SMichael Halcrow { 87047291baaSChristian Brauner return inode_permission(&init_user_ns, 87147291baaSChristian Brauner ecryptfs_inode_to_lower(inode), mask); 872237fead6SMichael Halcrow } 873237fead6SMichael Halcrow 874237fead6SMichael Halcrow /** 875237fead6SMichael Halcrow * ecryptfs_setattr 876c1632a0fSChristian Brauner * @idmap: idmap of the target mount 877237fead6SMichael Halcrow * @dentry: dentry handle to the inode to modify 878237fead6SMichael Halcrow * @ia: Structure with flags of what to change and values 879237fead6SMichael Halcrow * 880237fead6SMichael Halcrow * Updates the metadata of an inode. If the update is to the size 881237fead6SMichael Halcrow * i.e. truncation, then ecryptfs_truncate will handle the size modification 882237fead6SMichael Halcrow * of both the ecryptfs inode and the lower inode. 883237fead6SMichael Halcrow * 884237fead6SMichael Halcrow * All other metadata changes will be passed right to the lower filesystem, 885237fead6SMichael Halcrow * and we will just update our inode to look like the lower. 886237fead6SMichael Halcrow */ 887c1632a0fSChristian Brauner static int ecryptfs_setattr(struct mnt_idmap *idmap, 888549c7297SChristian Brauner struct dentry *dentry, struct iattr *ia) 889237fead6SMichael Halcrow { 890237fead6SMichael Halcrow int rc = 0; 891237fead6SMichael Halcrow struct dentry *lower_dentry; 8925f3ef64fSTyler Hicks struct iattr lower_ia; 893237fead6SMichael Halcrow struct inode *inode; 894237fead6SMichael Halcrow struct inode *lower_inode; 895237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 896237fead6SMichael Halcrow 8972b0143b5SDavid Howells crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; 898e81f3340SHerbert Xu if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) { 899e81f3340SHerbert Xu rc = ecryptfs_init_crypt_stat(crypt_stat); 900e81f3340SHerbert Xu if (rc) 901e81f3340SHerbert Xu return rc; 902e81f3340SHerbert Xu } 9032b0143b5SDavid Howells inode = d_inode(dentry); 904237fead6SMichael Halcrow lower_inode = ecryptfs_inode_to_lower(inode); 905e10f281bSMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 906e10f281bSMichael Halcrow mutex_lock(&crypt_stat->cs_mutex); 907e36cb0b8SDavid Howells if (d_is_dir(dentry)) 908e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 909e36cb0b8SDavid Howells else if (d_is_reg(dentry) 91064ee4808SMichael Halcrow && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) 91164ee4808SMichael Halcrow || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { 912e10f281bSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 913e10f281bSMichael Halcrow 914e10f281bSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 915e10f281bSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 9163b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 917332ab16fSTyler Hicks if (rc) { 918332ab16fSTyler Hicks mutex_unlock(&crypt_stat->cs_mutex); 919332ab16fSTyler Hicks goto out; 920332ab16fSTyler Hicks } 921d7cdc5feSMichael Halcrow rc = ecryptfs_read_metadata(dentry); 922332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 9235dda6992SMichael Halcrow if (rc) { 924e10f281bSMichael Halcrow if (!(mount_crypt_stat->flags 925e10f281bSMichael Halcrow & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { 926e10f281bSMichael Halcrow rc = -EIO; 92725bd8174SMichael Halcrow printk(KERN_WARNING "Either the lower file " 928e10f281bSMichael Halcrow "is not in a valid eCryptfs format, " 92925bd8174SMichael Halcrow "or the key could not be retrieved. " 93025bd8174SMichael Halcrow "Plaintext passthrough mode is not " 931e10f281bSMichael Halcrow "enabled; returning -EIO\n"); 932e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 933e10f281bSMichael Halcrow goto out; 934e10f281bSMichael Halcrow } 935e10f281bSMichael Halcrow rc = 0; 9363aeb86eaSTyler Hicks crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED 9373aeb86eaSTyler Hicks | ECRYPTFS_ENCRYPTED); 938e10f281bSMichael Halcrow } 939e10f281bSMichael Halcrow } 940e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 941a261a039STyler Hicks 942c1632a0fSChristian Brauner rc = setattr_prepare(&nop_mnt_idmap, dentry, ia); 943a261a039STyler Hicks if (rc) 944a261a039STyler Hicks goto out; 945a261a039STyler Hicks if (ia->ia_valid & ATTR_SIZE) { 946a261a039STyler Hicks rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size); 947a261a039STyler Hicks if (rc) 948a261a039STyler Hicks goto out; 949a261a039STyler Hicks } 950a261a039STyler Hicks 9515f3ef64fSTyler Hicks memcpy(&lower_ia, ia, sizeof(lower_ia)); 9525f3ef64fSTyler Hicks if (ia->ia_valid & ATTR_FILE) 9535f3ef64fSTyler Hicks lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); 954237fead6SMichael Halcrow if (ia->ia_valid & ATTR_SIZE) { 9555f3ef64fSTyler Hicks rc = truncate_upper(dentry, ia, &lower_ia); 956237fead6SMichael Halcrow if (rc < 0) 957237fead6SMichael Halcrow goto out; 958237fead6SMichael Halcrow } 9591ac564ecSJeff Layton 9601ac564ecSJeff Layton /* 9611ac564ecSJeff Layton * mode change is for clearing setuid/setgid bits. Allow lower fs 9621ac564ecSJeff Layton * to interpret this in its own way. 9631ac564ecSJeff Layton */ 9645f3ef64fSTyler Hicks if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 9655f3ef64fSTyler Hicks lower_ia.ia_valid &= ~ATTR_MODE; 9661ac564ecSJeff Layton 9675955102cSAl Viro inode_lock(d_inode(lower_dentry)); 968abf08576SChristian Brauner rc = notify_change(&nop_mnt_idmap, lower_dentry, &lower_ia, NULL); 9695955102cSAl Viro inode_unlock(d_inode(lower_dentry)); 970237fead6SMichael Halcrow out: 9719afa2fb6SErez Zadok fsstack_copy_attr_all(inode, lower_inode); 972237fead6SMichael Halcrow return rc; 973237fead6SMichael Halcrow } 974237fead6SMichael Halcrow 975b74d24f7SChristian Brauner static int ecryptfs_getattr_link(struct mnt_idmap *idmap, 976549c7297SChristian Brauner const struct path *path, struct kstat *stat, 977a528d35eSDavid Howells u32 request_mask, unsigned int flags) 9783a60a168STyler Hicks { 979a528d35eSDavid Howells struct dentry *dentry = path->dentry; 9803a60a168STyler Hicks struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 9813a60a168STyler Hicks int rc = 0; 9823a60a168STyler Hicks 9833a60a168STyler Hicks mount_crypt_stat = &ecryptfs_superblock_to_private( 9843a60a168STyler Hicks dentry->d_sb)->mount_crypt_stat; 985b74d24f7SChristian Brauner generic_fillattr(&nop_mnt_idmap, d_inode(dentry), stat); 9863a60a168STyler Hicks if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { 9873a60a168STyler Hicks char *target; 9883a60a168STyler Hicks size_t targetsiz; 9893a60a168STyler Hicks 990b22e8fedSAl Viro target = ecryptfs_readlink_lower(dentry, &targetsiz); 991b22e8fedSAl Viro if (!IS_ERR(target)) { 9923a60a168STyler Hicks kfree(target); 9933a60a168STyler Hicks stat->size = targetsiz; 994b22e8fedSAl Viro } else { 995b22e8fedSAl Viro rc = PTR_ERR(target); 9963a60a168STyler Hicks } 9973a60a168STyler Hicks } 9983a60a168STyler Hicks return rc; 9993a60a168STyler Hicks } 10003a60a168STyler Hicks 1001b74d24f7SChristian Brauner static int ecryptfs_getattr(struct mnt_idmap *idmap, 1002549c7297SChristian Brauner const struct path *path, struct kstat *stat, 1003a528d35eSDavid Howells u32 request_mask, unsigned int flags) 1004f8f484d1STyler Hicks { 1005a528d35eSDavid Howells struct dentry *dentry = path->dentry; 1006f8f484d1STyler Hicks struct kstat lower_stat; 1007f8f484d1STyler Hicks int rc; 1008f8f484d1STyler Hicks 1009a528d35eSDavid Howells rc = vfs_getattr(ecryptfs_dentry_to_lower_path(dentry), &lower_stat, 1010a528d35eSDavid Howells request_mask, flags); 1011f8f484d1STyler Hicks if (!rc) { 10122b0143b5SDavid Howells fsstack_copy_attr_all(d_inode(dentry), 10132b0143b5SDavid Howells ecryptfs_inode_to_lower(d_inode(dentry))); 1014b74d24f7SChristian Brauner generic_fillattr(&nop_mnt_idmap, d_inode(dentry), stat); 1015f8f484d1STyler Hicks stat->blocks = lower_stat.blocks; 1016f8f484d1STyler Hicks } 1017f8f484d1STyler Hicks return rc; 1018f8f484d1STyler Hicks } 1019f8f484d1STyler Hicks 1020dd2a3b7aSMichael Halcrow int 10213767e255SAl Viro ecryptfs_setxattr(struct dentry *dentry, struct inode *inode, 10223767e255SAl Viro const char *name, const void *value, 1023237fead6SMichael Halcrow size_t size, int flags) 1024237fead6SMichael Halcrow { 10255d6c3191SAndreas Gruenbacher int rc; 1026237fead6SMichael Halcrow struct dentry *lower_dentry; 10270b964446SMiklos Szeredi struct inode *lower_inode; 1028237fead6SMichael Halcrow 1029237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 10300b964446SMiklos Szeredi lower_inode = d_inode(lower_dentry); 10310b964446SMiklos Szeredi if (!(lower_inode->i_opflags & IOP_XATTR)) { 1032cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1033237fead6SMichael Halcrow goto out; 1034237fead6SMichael Halcrow } 10350b964446SMiklos Szeredi inode_lock(lower_inode); 10367d6beb71SLinus Torvalds rc = __vfs_setxattr_locked(&init_user_ns, lower_dentry, name, value, size, flags, NULL); 10370b964446SMiklos Szeredi inode_unlock(lower_inode); 10383767e255SAl Viro if (!rc && inode) 10390b964446SMiklos Szeredi fsstack_copy_attr_all(inode, lower_inode); 1040237fead6SMichael Halcrow out: 1041237fead6SMichael Halcrow return rc; 1042237fead6SMichael Halcrow } 1043237fead6SMichael Halcrow 1044dd2a3b7aSMichael Halcrow ssize_t 1045ce23e640SAl Viro ecryptfs_getxattr_lower(struct dentry *lower_dentry, struct inode *lower_inode, 1046ce23e640SAl Viro const char *name, void *value, size_t size) 1047d7cdc5feSMichael Halcrow { 10485d6c3191SAndreas Gruenbacher int rc; 1049d7cdc5feSMichael Halcrow 10505d6c3191SAndreas Gruenbacher if (!(lower_inode->i_opflags & IOP_XATTR)) { 1051cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1052d7cdc5feSMichael Halcrow goto out; 1053d7cdc5feSMichael Halcrow } 1054ce23e640SAl Viro inode_lock(lower_inode); 10555d6c3191SAndreas Gruenbacher rc = __vfs_getxattr(lower_dentry, lower_inode, name, value, size); 1056ce23e640SAl Viro inode_unlock(lower_inode); 1057d7cdc5feSMichael Halcrow out: 1058d7cdc5feSMichael Halcrow return rc; 1059d7cdc5feSMichael Halcrow } 1060d7cdc5feSMichael Halcrow 10617896b631SAdrian Bunk static ssize_t 1062ce23e640SAl Viro ecryptfs_getxattr(struct dentry *dentry, struct inode *inode, 1063ce23e640SAl Viro const char *name, void *value, size_t size) 1064237fead6SMichael Halcrow { 1065ce23e640SAl Viro return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), 1066ce23e640SAl Viro ecryptfs_inode_to_lower(inode), 1067ce23e640SAl Viro name, value, size); 1068237fead6SMichael Halcrow } 1069237fead6SMichael Halcrow 1070237fead6SMichael Halcrow static ssize_t 1071237fead6SMichael Halcrow ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) 1072237fead6SMichael Halcrow { 1073237fead6SMichael Halcrow int rc = 0; 1074237fead6SMichael Halcrow struct dentry *lower_dentry; 1075237fead6SMichael Halcrow 1076237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 10772b0143b5SDavid Howells if (!d_inode(lower_dentry)->i_op->listxattr) { 1078cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1079237fead6SMichael Halcrow goto out; 1080237fead6SMichael Halcrow } 10815955102cSAl Viro inode_lock(d_inode(lower_dentry)); 10822b0143b5SDavid Howells rc = d_inode(lower_dentry)->i_op->listxattr(lower_dentry, list, size); 10835955102cSAl Viro inode_unlock(d_inode(lower_dentry)); 1084237fead6SMichael Halcrow out: 1085237fead6SMichael Halcrow return rc; 1086237fead6SMichael Halcrow } 1087237fead6SMichael Halcrow 10884b899da5SAndreas Gruenbacher static int ecryptfs_removexattr(struct dentry *dentry, struct inode *inode, 10894b899da5SAndreas Gruenbacher const char *name) 1090237fead6SMichael Halcrow { 10915d6c3191SAndreas Gruenbacher int rc; 1092237fead6SMichael Halcrow struct dentry *lower_dentry; 10934b899da5SAndreas Gruenbacher struct inode *lower_inode; 1094237fead6SMichael Halcrow 1095237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 10964b899da5SAndreas Gruenbacher lower_inode = ecryptfs_inode_to_lower(inode); 10975d6c3191SAndreas Gruenbacher if (!(lower_inode->i_opflags & IOP_XATTR)) { 1098cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1099237fead6SMichael Halcrow goto out; 1100237fead6SMichael Halcrow } 11014b899da5SAndreas Gruenbacher inode_lock(lower_inode); 1102c7c7a1a1STycho Andersen rc = __vfs_removexattr(&init_user_ns, lower_dentry, name); 11034b899da5SAndreas Gruenbacher inode_unlock(lower_inode); 1104237fead6SMichael Halcrow out: 1105237fead6SMichael Halcrow return rc; 1106237fead6SMichael Halcrow } 1107237fead6SMichael Halcrow 110897e2dee9SMiklos Szeredi static int ecryptfs_fileattr_get(struct dentry *dentry, struct fileattr *fa) 110997e2dee9SMiklos Szeredi { 111097e2dee9SMiklos Szeredi return vfs_fileattr_get(ecryptfs_dentry_to_lower(dentry), fa); 111197e2dee9SMiklos Szeredi } 111297e2dee9SMiklos Szeredi 111397e2dee9SMiklos Szeredi static int ecryptfs_fileattr_set(struct user_namespace *mnt_userns, 111497e2dee9SMiklos Szeredi struct dentry *dentry, struct fileattr *fa) 111597e2dee9SMiklos Szeredi { 111697e2dee9SMiklos Szeredi struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 111797e2dee9SMiklos Szeredi int rc; 111897e2dee9SMiklos Szeredi 111997e2dee9SMiklos Szeredi rc = vfs_fileattr_set(&init_user_ns, lower_dentry, fa); 112097e2dee9SMiklos Szeredi fsstack_copy_attr_all(d_inode(dentry), d_inode(lower_dentry)); 112197e2dee9SMiklos Szeredi 112297e2dee9SMiklos Szeredi return rc; 112397e2dee9SMiklos Szeredi } 112497e2dee9SMiklos Szeredi 1125af84016fSChristian Brauner static struct posix_acl *ecryptfs_get_acl(struct user_namespace *mnt_userns, 1126af84016fSChristian Brauner struct dentry *dentry, int type) 1127af84016fSChristian Brauner { 1128af84016fSChristian Brauner return vfs_get_acl(mnt_userns, ecryptfs_dentry_to_lower(dentry), 1129af84016fSChristian Brauner posix_acl_xattr_name(type)); 1130af84016fSChristian Brauner } 1131af84016fSChristian Brauner 113286c261b9SChristian Brauner static int ecryptfs_set_acl(struct user_namespace *mnt_userns, 113386c261b9SChristian Brauner struct dentry *dentry, struct posix_acl *acl, 113486c261b9SChristian Brauner int type) 113586c261b9SChristian Brauner { 113686c261b9SChristian Brauner int rc; 113786c261b9SChristian Brauner struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 113886c261b9SChristian Brauner struct inode *lower_inode = d_inode(lower_dentry); 113986c261b9SChristian Brauner 114086c261b9SChristian Brauner rc = vfs_set_acl(&init_user_ns, lower_dentry, 114186c261b9SChristian Brauner posix_acl_xattr_name(type), acl); 114286c261b9SChristian Brauner if (!rc) 114386c261b9SChristian Brauner fsstack_copy_attr_all(d_inode(dentry), lower_inode); 114486c261b9SChristian Brauner return rc; 114586c261b9SChristian Brauner } 114686c261b9SChristian Brauner 1147754661f1SArjan van de Ven const struct inode_operations ecryptfs_symlink_iops = { 11486b255391SAl Viro .get_link = ecryptfs_get_link, 1149237fead6SMichael Halcrow .permission = ecryptfs_permission, 1150237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 11513a60a168STyler Hicks .getattr = ecryptfs_getattr_link, 1152237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1153237fead6SMichael Halcrow }; 1154237fead6SMichael Halcrow 1155754661f1SArjan van de Ven const struct inode_operations ecryptfs_dir_iops = { 1156237fead6SMichael Halcrow .create = ecryptfs_create, 1157237fead6SMichael Halcrow .lookup = ecryptfs_lookup, 1158237fead6SMichael Halcrow .link = ecryptfs_link, 1159237fead6SMichael Halcrow .unlink = ecryptfs_unlink, 1160237fead6SMichael Halcrow .symlink = ecryptfs_symlink, 1161237fead6SMichael Halcrow .mkdir = ecryptfs_mkdir, 1162237fead6SMichael Halcrow .rmdir = ecryptfs_rmdir, 1163237fead6SMichael Halcrow .mknod = ecryptfs_mknod, 1164237fead6SMichael Halcrow .rename = ecryptfs_rename, 1165237fead6SMichael Halcrow .permission = ecryptfs_permission, 1166237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1167237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 116897e2dee9SMiklos Szeredi .fileattr_get = ecryptfs_fileattr_get, 116997e2dee9SMiklos Szeredi .fileattr_set = ecryptfs_fileattr_set, 1170af84016fSChristian Brauner .get_acl = ecryptfs_get_acl, 117186c261b9SChristian Brauner .set_acl = ecryptfs_set_acl, 1172237fead6SMichael Halcrow }; 1173237fead6SMichael Halcrow 1174754661f1SArjan van de Ven const struct inode_operations ecryptfs_main_iops = { 1175237fead6SMichael Halcrow .permission = ecryptfs_permission, 1176237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1177f8f484d1STyler Hicks .getattr = ecryptfs_getattr, 1178237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 117997e2dee9SMiklos Szeredi .fileattr_get = ecryptfs_fileattr_get, 118097e2dee9SMiklos Szeredi .fileattr_set = ecryptfs_fileattr_set, 1181af84016fSChristian Brauner .get_acl = ecryptfs_get_acl, 118286c261b9SChristian Brauner .set_acl = ecryptfs_set_acl, 11834b899da5SAndreas Gruenbacher }; 11844b899da5SAndreas Gruenbacher 11854b899da5SAndreas Gruenbacher static int ecryptfs_xattr_get(const struct xattr_handler *handler, 11864b899da5SAndreas Gruenbacher struct dentry *dentry, struct inode *inode, 11874b899da5SAndreas Gruenbacher const char *name, void *buffer, size_t size) 11884b899da5SAndreas Gruenbacher { 11894b899da5SAndreas Gruenbacher return ecryptfs_getxattr(dentry, inode, name, buffer, size); 11904b899da5SAndreas Gruenbacher } 11914b899da5SAndreas Gruenbacher 11924b899da5SAndreas Gruenbacher static int ecryptfs_xattr_set(const struct xattr_handler *handler, 1193e65ce2a5SChristian Brauner struct user_namespace *mnt_userns, 11944b899da5SAndreas Gruenbacher struct dentry *dentry, struct inode *inode, 11954b899da5SAndreas Gruenbacher const char *name, const void *value, size_t size, 11964b899da5SAndreas Gruenbacher int flags) 11974b899da5SAndreas Gruenbacher { 11984b899da5SAndreas Gruenbacher if (value) 11994b899da5SAndreas Gruenbacher return ecryptfs_setxattr(dentry, inode, name, value, size, flags); 12004b899da5SAndreas Gruenbacher else { 12014b899da5SAndreas Gruenbacher BUG_ON(flags != XATTR_REPLACE); 12024b899da5SAndreas Gruenbacher return ecryptfs_removexattr(dentry, inode, name); 12034b899da5SAndreas Gruenbacher } 12044b899da5SAndreas Gruenbacher } 12054b899da5SAndreas Gruenbacher 1206c036061bSYueHaibing static const struct xattr_handler ecryptfs_xattr_handler = { 12074b899da5SAndreas Gruenbacher .prefix = "", /* match anything */ 12084b899da5SAndreas Gruenbacher .get = ecryptfs_xattr_get, 12094b899da5SAndreas Gruenbacher .set = ecryptfs_xattr_set, 12104b899da5SAndreas Gruenbacher }; 12114b899da5SAndreas Gruenbacher 12124b899da5SAndreas Gruenbacher const struct xattr_handler *ecryptfs_xattr_handlers[] = { 121304af28faSChristian Brauner #ifdef CONFIG_FS_POSIX_ACL 121404af28faSChristian Brauner &posix_acl_access_xattr_handler, 121504af28faSChristian Brauner &posix_acl_default_xattr_handler, 121604af28faSChristian Brauner #endif 12174b899da5SAndreas Gruenbacher &ecryptfs_xattr_handler, 12184b899da5SAndreas Gruenbacher NULL 1219237fead6SMichael Halcrow }; 1220