/** * ecryptfs_do_create * @directory_inode: inode of the new file's dentry's parent in ecryptfs * @ecryptfs_dentry: New file's dentry in ecryptfs * @mode: The mode of the new file * @nd: nameidata of ecryptfs' parent's dentry & vfsmount * * Creates the underlying file and the eCryptfs inode which will link to * it. It will also update the eCryptfs directory inode to mimic the * stat of the lower directory inode. * * Returns the new eCryptfs inode on success; an ERR_PTR on error condition */ static struct inode * ecryptfs_do_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, umode_t mode) { int rc; struct dentry *lower_dentry; struct dentry *lower_dir_dentry; struct inode *inode; lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); lower_dir_dentry = lock_parent(lower_dentry); if (IS_ERR(lower_dir_dentry)) { ecryptfs_printk(KERN_ERR, "Error locking directory of " "dentry\n"); inode = ERR_CAST(lower_dir_dentry); goto out; } rc = vfs_create(lower_dir_dentry->d_inode, lower_dentry, mode, true); if (rc) { printk(KERN_ERR "%s: Failure to create dentry in lower fs; " "rc = [%d]\n", __func__, rc); inode = ERR_PTR(rc); goto out_lock; } inode = __ecryptfs_get_inode(lower_dentry->d_inode, directory_inode->i_sb); if (IS_ERR(inode)) { vfs_unlink(lower_dir_dentry->d_inode, lower_dentry, NULL); goto out_lock; } fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode); fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode); out_lock: unlock_dir(lower_dir_dentry); out: return inode; }
/** * ecryptfs_do_create * @directory_inode: inode of the new file's dentry's parent in ecryptfs * @ecryptfs_dentry: New file's dentry in ecryptfs * @mode: The mode of the new file * @nd: nameidata of ecryptfs' parent's dentry & vfsmount * * Creates the underlying file and the eCryptfs inode which will link to * it. It will also update the eCryptfs directory inode to mimic the * stat of the lower directory inode. * * Returns zero on success; non-zero on error condition */ static int ecryptfs_do_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, int mode, struct nameidata *nd) { int rc; struct dentry *lower_dentry; struct dentry *lower_dir_dentry; lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); lower_dir_dentry = lock_parent(lower_dentry); if (unlikely(IS_ERR(lower_dir_dentry))) { ecryptfs_printk(KERN_ERR, "Error locking directory of " "dentry\n"); rc = PTR_ERR(lower_dir_dentry); goto out; } rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode, ecryptfs_dentry, mode, nd); if (rc) { printk(KERN_ERR "%s: Failure to create dentry in lower fs; " "rc = [%d]\n", __FUNCTION__, rc); goto out_lock; } rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, directory_inode->i_sb, 0); if (rc) { ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n"); goto out_lock; } fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode); fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode); out_lock: unlock_dir(lower_dir_dentry); out: return rc; }
static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) { struct dentry *lower_dentry; struct vfsmount *lower_mnt; struct dentry *lower_dir_dentry; int rc; lower_dentry = ecryptfs_dentry_to_lower(dentry); lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); dget(dentry); lower_dir_dentry = lock_parent(lower_dentry); dget(lower_dentry); rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry, lower_mnt); dput(lower_dentry); if (!rc) d_delete(lower_dentry); fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; unlock_dir(lower_dir_dentry); if (!rc) d_drop(dentry); dput(dentry); return rc; }
static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) { int rc = 0; struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); struct dentry *lower_dir_dentry; dget(lower_dentry); lower_dir_dentry = lock_parent(lower_dentry); rc = vfs_unlink(lower_dir_inode, lower_dentry); if (rc) { printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); goto out_unlock; } fsstack_copy_attr_times(dir, lower_dir_inode); set_nlink(dentry->d_inode, ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink); dentry->d_inode->i_ctime = dir->i_ctime; d_drop(dentry); out_unlock: unlock_dir(lower_dir_dentry); dput(lower_dentry); return rc; }
static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) { struct dentry *lower_dentry; struct dentry *lower_dir_dentry; int rc; dentry_unhash(dentry); lower_dentry = ecryptfs_dentry_to_lower(dentry); dget(dentry); lower_dir_dentry = lock_parent(lower_dentry); dget(lower_dentry); rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); dput(lower_dentry); if (!rc && dentry->d_inode) clear_nlink(dentry->d_inode); fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); set_nlink(dir, lower_dir_dentry->d_inode->i_nlink); unlock_dir(lower_dir_dentry); if (!rc) d_drop(dentry); dput(dentry); return rc; }
/** * ecryptfs_show_options * * Prints the directory we are currently mounted over. * Returns zero on success; non-zero otherwise */ static int ecryptfs_show_options(struct seq_file *m, struct vfsmount *mnt) { struct super_block *sb = mnt->mnt_sb; struct dentry *lower_root_dentry = ecryptfs_dentry_to_lower(sb->s_root); struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(sb->s_root); char *tmp_page; char *path; int rc = 0; tmp_page = (char *)__get_free_page(GFP_KERNEL); if (!tmp_page) { rc = -ENOMEM; goto out; } path = d_path(lower_root_dentry, lower_mnt, tmp_page, PAGE_SIZE); if (IS_ERR(path)) { rc = PTR_ERR(path); goto out; } seq_printf(m, ",dir=%s", path); free_page((unsigned long)tmp_page); out: return rc; }
/** * ecryptfs_create_underlying_file * @lower_dir_inode: inode of the parent in the lower fs of the new file * @dentry: New file's dentry * @mode: The mode of the new file * @nd: nameidata of ecryptfs' parent's dentry & vfsmount * * Creates the file in the lower file system. * * Returns zero on success; non-zero on error condition */ static int ecryptfs_create_underlying_file(struct inode *lower_dir_inode, struct dentry *dentry, int mode, struct nameidata *nd) { struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); struct dentry *dentry_save; struct vfsmount *vfsmount_save; unsigned int flags_save; int rc; dentry_save = nd->path.dentry; vfsmount_save = nd->path.mnt; flags_save = nd->flags; nd->path.dentry = lower_dentry; nd->path.mnt = lower_mnt; nd->flags &= ~LOOKUP_OPEN; rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd); nd->path.dentry = dentry_save; nd->path.mnt = vfsmount_save; nd->flags = flags_save; return rc; }
/** * ecryptfs_do_create * @directory_inode: inode of the new file's dentry's parent in ecryptfs * @ecryptfs_dentry: New file's dentry in ecryptfs * @mode: The mode of the new file * @nd: nameidata of ecryptfs' parent's dentry & vfsmount * * Creates the underlying file and the eCryptfs inode which will link to * it. It will also update the eCryptfs directory inode to mimic the * stat of the lower directory inode. * * Returns zero on success; non-zero on error condition */ static int ecryptfs_do_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, int mode, struct nameidata *nd) { int rc; struct dentry *lower_dentry; struct dentry *lower_dir_dentry; lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); lower_dir_dentry = lock_parent(lower_dentry); if (IS_ERR(lower_dir_dentry)) { ecryptfs_printk(KERN_ERR, "Error locking directory of " "dentry\n"); rc = PTR_ERR(lower_dir_dentry); goto out; } rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode, ecryptfs_dentry, mode, nd); if (rc) { printk(KERN_ERR "%s: Failure to create dentry in lower fs; " "rc = [%d]\n", __func__, rc); inode = ERR_PTR(rc); goto out_lock; } inode = __ecryptfs_get_inode(lower_dentry->d_inode, directory_inode->i_sb); if (IS_ERR(inode)) goto out_lock; fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode); fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode); out_lock: unlock_dir(lower_dir_dentry); out: return inode; }
/** * ecryptfs_open * @inode: inode speciying file to open * @file: Structure to return filled in * * Opens the file specified by inode. * * Returns zero on success; non-zero otherwise */ static int ecryptfs_open(struct inode *inode, struct file *file) { int rc = 0; struct ecryptfs_crypt_stat *crypt_stat = NULL; struct dentry *ecryptfs_dentry = file->f_path.dentry; /* Private value of ecryptfs_dentry allocated in * ecryptfs_lookup() */ struct dentry *lower_dentry; struct ecryptfs_file_info *file_info; /* Released in ecryptfs_release or end of function if failure */ file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL); ecryptfs_set_file_private(file, file_info); if (!file_info) { ecryptfs_printk(KERN_ERR, "Error attempting to allocate memory\n"); rc = -ENOMEM; goto out; } lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; mutex_lock(&crypt_stat->cs_mutex); if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) { ecryptfs_printk(KERN_DEBUG, "Setting flags for stat...\n"); /* Policy code enabled in future release */ crypt_stat->flags |= (ECRYPTFS_POLICY_APPLIED | ECRYPTFS_ENCRYPTED); } mutex_unlock(&crypt_stat->cs_mutex); rc = ecryptfs_get_lower_file(ecryptfs_dentry, inode); if (rc) { printk(KERN_ERR "%s: Error attempting to initialize " "the lower file for the dentry with name " "[%s]; rc = [%d]\n", __func__, ecryptfs_dentry->d_name.name, rc); goto out_free; } if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_ACCMODE) == O_RDONLY && (file->f_flags & O_ACCMODE) != O_RDONLY) { rc = -EPERM; printk(KERN_WARNING "%s: Lower file is RO; eCryptfs " "file must hence be opened RO\n", __func__); goto out_put; } ecryptfs_set_file_lower( file, ecryptfs_inode_to_private(inode)->lower_file); if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) { ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); mutex_lock(&crypt_stat->cs_mutex); crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); mutex_unlock(&crypt_stat->cs_mutex); rc = 0; goto out; } rc = read_or_initialize_metadata(ecryptfs_dentry); if (rc) goto out_put; ecryptfs_printk(KERN_DEBUG, "inode w/ addr = [0x%p], i_ino = " "[0x%.16lx] size: [0x%.16llx]\n", inode, inode->i_ino, (unsigned long long)i_size_read(inode)); goto out; out_put: ecryptfs_put_lower_file(inode); out_free: kmem_cache_free(ecryptfs_file_info_cache, ecryptfs_file_to_private(file)); out: return rc; }
/** * ecryptfs_open * @inode: inode speciying file to open * @file: Structure to return filled in * * Opens the file specified by inode. * * Returns zero on success; non-zero otherwise */ static int ecryptfs_open(struct inode *inode, struct file *file) { int rc = 0; struct ecryptfs_crypt_stat *crypt_stat = NULL; struct ecryptfs_mount_crypt_stat *mount_crypt_stat; struct dentry *ecryptfs_dentry = file->f_path.dentry; /* Private value of ecryptfs_dentry allocated in * ecryptfs_lookup() */ struct dentry *lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); struct inode *lower_inode = NULL; struct file *lower_file = NULL; struct vfsmount *lower_mnt; struct ecryptfs_file_info *file_info; int lower_flags; /* Released in ecryptfs_release or end of function if failure */ file_info = kmem_cache_alloc(ecryptfs_file_info_cache, GFP_KERNEL); ecryptfs_set_file_private(file, file_info); if (!file_info) { ecryptfs_printk(KERN_ERR, "Error attempting to allocate memory\n"); rc = -ENOMEM; goto out; } memset(file_info, 0, sizeof(*file_info)); lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; mount_crypt_stat = &ecryptfs_superblock_to_private( ecryptfs_dentry->d_sb)->mount_crypt_stat; mutex_lock(&crypt_stat->cs_mutex); if (!ECRYPTFS_CHECK_FLAG(crypt_stat->flags, ECRYPTFS_POLICY_APPLIED)) { ecryptfs_printk(KERN_DEBUG, "Setting flags for stat...\n"); /* Policy code enabled in future release */ ECRYPTFS_SET_FLAG(crypt_stat->flags, ECRYPTFS_POLICY_APPLIED); ECRYPTFS_SET_FLAG(crypt_stat->flags, ECRYPTFS_ENCRYPTED); } mutex_unlock(&crypt_stat->cs_mutex); lower_flags = file->f_flags; if ((lower_flags & O_ACCMODE) == O_WRONLY) lower_flags = (lower_flags & O_ACCMODE) | O_RDWR; if (file->f_flags & O_APPEND) lower_flags &= ~O_APPEND; lower_mnt = ecryptfs_dentry_to_lower_mnt(ecryptfs_dentry); /* Corresponding fput() in ecryptfs_release() */ if ((rc = ecryptfs_open_lower_file(&lower_file, lower_dentry, lower_mnt, lower_flags))) { ecryptfs_printk(KERN_ERR, "Error opening lower file\n"); goto out_puts; } ecryptfs_set_file_lower(file, lower_file); /* Isn't this check the same as the one in lookup? */ lower_inode = lower_dentry->d_inode; if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) { ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); ECRYPTFS_CLEAR_FLAG(crypt_stat->flags, ECRYPTFS_ENCRYPTED); rc = 0; goto out; } mutex_lock(&crypt_stat->cs_mutex); if (i_size_read(lower_inode) < ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE) { if (!(mount_crypt_stat->flags & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { rc = -EIO; printk(KERN_WARNING "Attempt to read file that is " "not in a valid eCryptfs format, and plaintext " "passthrough mode is not enabled; returning " "-EIO\n"); mutex_unlock(&crypt_stat->cs_mutex); goto out_puts; } crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); rc = 0; mutex_unlock(&crypt_stat->cs_mutex); goto out; } else if (!ECRYPTFS_CHECK_FLAG(crypt_stat->flags, ECRYPTFS_POLICY_APPLIED) || !ECRYPTFS_CHECK_FLAG(crypt_stat->flags, ECRYPTFS_KEY_VALID)) { rc = ecryptfs_read_headers(ecryptfs_dentry, lower_file); if (rc) { ecryptfs_printk(KERN_DEBUG, "Valid headers not found\n"); if (!(mount_crypt_stat->flags & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { rc = -EIO; printk(KERN_WARNING "Attempt to read file that " "is not in a valid eCryptfs format, " "and plaintext passthrough mode is not " "enabled; returning -EIO\n"); mutex_unlock(&crypt_stat->cs_mutex); goto out_puts; } ECRYPTFS_CLEAR_FLAG(crypt_stat->flags, ECRYPTFS_ENCRYPTED); rc = 0; mutex_unlock(&crypt_stat->cs_mutex); goto out; } } mutex_unlock(&crypt_stat->cs_mutex); ecryptfs_printk(KERN_DEBUG, "inode w/ addr = [0x%p], i_ino = [0x%.16x] " "size: [0x%.16x]\n", inode, inode->i_ino, i_size_read(inode)); ecryptfs_set_file_lower(file, lower_file); goto out; out_puts: mntput(lower_mnt); dput(lower_dentry); kmem_cache_free(ecryptfs_file_info_cache, ecryptfs_file_to_private(file)); out: return rc; }
/** * ecryptfs_lookup * @dir: inode * @dentry: The dentry * @nd: nameidata, may be NULL * * Find a file on disk. If the file does not exist, then we'll add it to the * dentry cache and continue on to read it from the disk. */ static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) { int rc = 0; struct dentry *lower_dir_dentry; struct dentry *lower_dentry; struct vfsmount *lower_mnt; char *encoded_name; int encoded_namelen; struct ecryptfs_crypt_stat *crypt_stat = NULL; struct ecryptfs_mount_crypt_stat *mount_crypt_stat; char *page_virt = NULL; struct inode *lower_inode; u64 file_size; lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent); dentry->d_op = &ecryptfs_dops; if ((dentry->d_name.len == 1 && !strcmp(dentry->d_name.name, ".")) || (dentry->d_name.len == 2 && !strcmp(dentry->d_name.name, ".."))) { d_drop(dentry); goto out; } encoded_namelen = ecryptfs_encode_filename(crypt_stat, dentry->d_name.name, dentry->d_name.len, &encoded_name); if (encoded_namelen < 0) { rc = encoded_namelen; d_drop(dentry); goto out; } ecryptfs_printk(KERN_DEBUG, "encoded_name = [%s]; encoded_namelen " "= [%d]\n", encoded_name, encoded_namelen); lower_dentry = lookup_one_len(encoded_name, lower_dir_dentry, encoded_namelen - 1); kfree(encoded_name); if (IS_ERR(lower_dentry)) { ecryptfs_printk(KERN_ERR, "ERR from lower_dentry\n"); rc = PTR_ERR(lower_dentry); d_drop(dentry); goto out; } lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); ecryptfs_printk(KERN_DEBUG, "lower_dentry = [%p]; lower_dentry->" "d_name.name = [%s]\n", lower_dentry, lower_dentry->d_name.name); lower_inode = lower_dentry->d_inode; fsstack_copy_attr_atime(dir, lower_dir_dentry->d_inode); BUG_ON(!atomic_read(&lower_dentry->d_count)); ecryptfs_set_dentry_private(dentry, kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL)); if (!ecryptfs_dentry_to_private(dentry)) { rc = -ENOMEM; ecryptfs_printk(KERN_ERR, "Out of memory whilst attempting " "to allocate ecryptfs_dentry_info struct\n"); goto out_dput; } ecryptfs_set_dentry_lower(dentry, lower_dentry); ecryptfs_set_dentry_lower_mnt(dentry, lower_mnt); if (!lower_dentry->d_inode) { /* We want to add because we couldn't find in lower */ d_add(dentry, NULL); goto out; } rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, ECRYPTFS_INTERPOSE_FLAG_D_ADD); if (rc) { ecryptfs_printk(KERN_ERR, "Error interposing\n"); goto out; } if (S_ISDIR(lower_inode->i_mode)) { ecryptfs_printk(KERN_DEBUG, "Is a directory; returning\n"); goto out; } if (S_ISLNK(lower_inode->i_mode)) { ecryptfs_printk(KERN_DEBUG, "Is a symlink; returning\n"); goto out; } if (special_file(lower_inode->i_mode)) { ecryptfs_printk(KERN_DEBUG, "Is a special file; returning\n"); goto out; } if (!nd) { ecryptfs_printk(KERN_DEBUG, "We have a NULL nd, just leave" "as we *think* we are about to unlink\n"); goto out; } /* Released in this function */ page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER); if (!page_virt) { rc = -ENOMEM; ecryptfs_printk(KERN_ERR, "Cannot ecryptfs_kmalloc a page\n"); goto out; } crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) ecryptfs_set_default_sizes(crypt_stat); if (!ecryptfs_inode_to_private(dentry->d_inode)->lower_file) { rc = ecryptfs_init_persistent_file(dentry); if (rc) { printk(KERN_ERR "%s: Error attempting to initialize " "the persistent file for the dentry with name " "[%s]; rc = [%d]\n", __func__, dentry->d_name.name, rc); goto out; } } rc = ecryptfs_read_and_validate_header_region(page_virt, dentry->d_inode); if (rc) { rc = ecryptfs_read_and_validate_xattr_region(page_virt, dentry); if (rc) { printk(KERN_DEBUG "Valid metadata not found in header " "region or xattr region; treating file as " "unencrypted\n"); rc = 0; kmem_cache_free(ecryptfs_header_cache_2, page_virt); goto out; } crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; } mount_crypt_stat = &ecryptfs_superblock_to_private( dentry->d_sb)->mount_crypt_stat; if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) { if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) file_size = (crypt_stat->num_header_bytes_at_front + i_size_read(lower_dentry->d_inode)); else file_size = i_size_read(lower_dentry->d_inode); } else { file_size = get_unaligned_be64(page_virt); } i_size_write(dentry->d_inode, (loff_t)file_size); kmem_cache_free(ecryptfs_header_cache_2, page_virt); goto out; out_dput: dput(lower_dentry); d_drop(dentry); out: return ERR_PTR(rc); }
static int ecryptfs_update_crypt_flag(struct dentry *dentry, int is_sensitive) { int rc = 0; struct dentry *lower_dentry; struct inode *inode; struct inode *lower_inode; struct ecryptfs_crypt_stat *crypt_stat; struct ecryptfs_mount_crypt_stat *mount_crypt_stat; crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) ecryptfs_init_crypt_stat(crypt_stat); inode = dentry->d_inode; lower_inode = ecryptfs_inode_to_lower(inode); lower_dentry = ecryptfs_dentry_to_lower(dentry); mutex_lock(&crypt_stat->cs_mutex); mount_crypt_stat = &ecryptfs_superblock_to_private( dentry->d_sb)->mount_crypt_stat; rc = ecryptfs_get_lower_file(dentry, inode); if (rc) { mutex_unlock(&crypt_stat->cs_mutex); DEK_LOGE("ecryptfs_get_lower_file rc=%d\n", rc); goto out; } if (is_sensitive) { crypt_stat->flags |= ECRYPTFS_DEK_IS_SENSITIVE; /* * Set sensirive for all the pages in the inode */ set_sensitive_mapping_pages(inode->i_mapping, 0, -1); } else{ crypt_stat->flags &= ~ECRYPTFS_DEK_IS_SENSITIVE; } rc = ecryptfs_write_metadata(dentry, inode); if (rc) { if (!(mount_crypt_stat->flags & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { rc = -EIO; DEK_LOGE("Either the lower file " "is not in a valid eCryptfs format, " "or the key could not be retrieved. " "Plaintext passthrough mode is not " "enabled; returning -EIO\n"); mutex_unlock(&crypt_stat->cs_mutex); DEK_LOGD("ecryptfs_write_metadata rc=%d\n", rc); goto out; } rc = 0; crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED | ECRYPTFS_ENCRYPTED); } rc = ecryptfs_write_inode_size_to_metadata(inode); if (rc) { mutex_unlock(&crypt_stat->cs_mutex); DEK_LOGE("Problem with " "ecryptfs_write_inode_size_to_metadata; " "rc = [%d]\n", rc); goto out; } ecryptfs_put_lower_file(inode); mutex_unlock(&crypt_stat->cs_mutex); out: fsstack_copy_attr_all(inode, lower_inode); return rc; }
static int ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry) { int rc; struct dentry *lower_old_dentry; struct dentry *lower_new_dentry; struct dentry *lower_old_dir_dentry; struct dentry *lower_new_dir_dentry; struct dentry *trap = NULL; struct inode *target_inode; #ifdef CONFIG_DLP sdp_fs_command_t *cmd1 = NULL; unsigned long old_inode = old_dentry->d_inode->i_ino; #endif #ifdef CONFIG_SDP sdp_fs_command_t *cmd = NULL; int rename_event = 0x00; struct ecryptfs_crypt_stat *crypt_stat = &(ecryptfs_inode_to_private(old_dentry->d_inode)->crypt_stat); struct ecryptfs_crypt_stat *parent_crypt_stat = &(ecryptfs_inode_to_private(old_dentry->d_parent->d_inode)->crypt_stat); struct ecryptfs_crypt_stat *new_parent_crypt_stat = &(ecryptfs_inode_to_private(new_dentry->d_parent->d_inode)->crypt_stat); struct ecryptfs_mount_crypt_stat *mount_crypt_stat = &ecryptfs_superblock_to_private(old_dentry->d_sb)->mount_crypt_stat; #if ECRYPTFS_SDP_RENAME_DEBUG printk("You're renaming %s to %s\n", old_dentry->d_name.name, new_dentry->d_name.name); printk("old_dentry[%p] : %s [parent %s : %s] inode:%p\n", old_dentry, old_dentry->d_name.name, old_dentry->d_parent->d_name.name, IS_SENSITIVE_DENTRY(old_dentry->d_parent) ? "sensitive" : "protected", old_dentry->d_inode); printk("new_dentry[%p] : %s [parent %s : %s] inode:%p\n", new_dentry, new_dentry->d_name.name, new_dentry->d_parent->d_name.name, IS_SENSITIVE_DENTRY(new_dentry->d_parent) ? "sensitive" : "protected", new_dentry->d_inode); #endif if(IS_CHAMBER_DENTRY(old_dentry)) { printk("Rename trial on chamber : failed\n"); return -EIO; } #if 0 // kernel panic. new_crypt_stat->engine_id if(IS_SENSITIVE_DENTRY(old_dentry->d_parent) && IS_SENSITIVE_DENTRY(new_dentry->d_parent)) { if(crypt_stat->engine_id != new_crypt_stat->engine_id) { printk("Rename chamber file to another chamber : failed\n"); return -EIO; } } #endif if(IS_SENSITIVE_DENTRY(old_dentry->d_parent)) { if(ecryptfs_is_sdp_locked(parent_crypt_stat->engine_id)) { printk("Rename/move trial in locked state\n"); return -EIO; } } if(IS_SENSITIVE_DENTRY(old_dentry->d_parent) && IS_SENSITIVE_DENTRY(new_dentry->d_parent)) { if(parent_crypt_stat->engine_id != new_parent_crypt_stat->engine_id) { printk("Can't move between chambers\n"); return -EIO; } } if(IS_SENSITIVE_DENTRY(old_dentry->d_parent) && !IS_SENSITIVE_DENTRY(new_dentry->d_parent)) rename_event |= ECRYPTFS_EVT_RENAME_OUT_OF_CHAMBER; if(!IS_SENSITIVE_DENTRY(old_dentry->d_parent) && IS_SENSITIVE_DENTRY(new_dentry->d_parent)) rename_event |= ECRYPTFS_EVT_RENAME_TO_CHAMBER; #endif lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); dget(lower_old_dentry); dget(lower_new_dentry); lower_old_dir_dentry = dget_parent(lower_old_dentry); lower_new_dir_dentry = dget_parent(lower_new_dentry); target_inode = new_dentry->d_inode; trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); /* source should not be ancestor of target */ if (trap == lower_old_dentry) { rc = -EINVAL; goto out_lock; } /* target should not be ancestor of source */ if (trap == lower_new_dentry) { rc = -ENOTEMPTY; goto out_lock; } rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, lower_new_dir_dentry->d_inode, lower_new_dentry); if (rc) goto out_lock; if (target_inode) fsstack_copy_attr_all(target_inode, ecryptfs_inode_to_lower(target_inode)); fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode); if (new_dir != old_dir) fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode); #ifdef CONFIG_SDP if(!rc) { crypt_stat = &(ecryptfs_inode_to_private(old_dentry->d_inode)->crypt_stat); if(rename_event > 0) { switch(rename_event) { case ECRYPTFS_EVT_RENAME_TO_CHAMBER: cmd = sdp_fs_command_alloc(FSOP_SDP_SET_SENSITIVE, current->pid, mount_crypt_stat->userid, mount_crypt_stat->partition_id, old_dentry->d_inode->i_ino, GFP_NOFS); break; case ECRYPTFS_EVT_RENAME_OUT_OF_CHAMBER: cmd = sdp_fs_command_alloc(FSOP_SDP_SET_PROTECTED, current->pid, mount_crypt_stat->userid, mount_crypt_stat->partition_id, old_dentry->d_inode->i_ino, GFP_NOFS); break; default: cmd = NULL; break; } } #if ECRYPTFS_SDP_RENAME_DEBUG printk("[end of rename] old_dentry[%p] : %s [parent %s : %s] inode:%p\n", old_dentry, old_dentry->d_name.name, old_dentry->d_parent->d_name.name, IS_SENSITIVE_DENTRY(old_dentry->d_parent) ? "sensitive" : "protected", old_dentry->d_inode); printk("[end of rename] new_dentry[%p] : %s [parent %s : %s] inode:%p\n", new_dentry, new_dentry->d_name.name, new_dentry->d_parent->d_name.name, IS_SENSITIVE_DENTRY(new_dentry->d_parent) ? "sensitive" : "protected", new_dentry->d_inode); #endif } #endif out_lock: unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); dput(lower_new_dir_dentry); dput(lower_old_dir_dentry); dput(lower_new_dentry); dput(lower_old_dentry); #ifdef CONFIG_SDP if(!rc && cmd != NULL) { sdp_fs_request(cmd, ecryptfs_fs_request_callback); sdp_fs_command_free(cmd); } #endif #ifdef CONFIG_DLP //create new init command and send--Handle transient case MS-Apps if(crypt_stat->flags & ECRYPTFS_DLP_ENABLED) { if(!rc && (in_egroup_p(AID_KNOX_DLP) || in_egroup_p(AID_KNOX_DLP_RESTRICTED))){ cmd1 = sdp_fs_command_alloc(FSOP_DLP_FILE_RENAME, current->tgid, mount_crypt_stat->userid, mount_crypt_stat->partition_id, old_inode, GFP_KERNEL); //send cmd if(cmd1) { sdp_fs_request(cmd1, NULL); sdp_fs_command_free(cmd1); } } } //end- Handle transient case MS-Apps #endif return rc; }
/** * ecryptfs_lookup * @ecryptfs_dir_inode: The eCryptfs directory inode * @ecryptfs_dentry: The eCryptfs dentry that we are looking up * @ecryptfs_nd: nameidata; may be NULL * * Find a file on disk. If the file does not exist, then we'll add it to the * dentry cache and continue on to read it from the disk. */ static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, struct dentry *ecryptfs_dentry, struct nameidata *ecryptfs_nd) { char *encrypted_and_encoded_name = NULL; size_t encrypted_and_encoded_name_size; struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; struct dentry *lower_dir_dentry, *lower_dentry; int rc = 0; if ((ecryptfs_dentry->d_name.len == 1 && !strcmp(ecryptfs_dentry->d_name.name, ".")) || (ecryptfs_dentry->d_name.len == 2 && !strcmp(ecryptfs_dentry->d_name.name, ".."))) { goto out_d_drop; } lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); mutex_lock(&lower_dir_dentry->d_inode->i_mutex); lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, lower_dir_dentry, ecryptfs_dentry->d_name.len); mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); if (IS_ERR(lower_dentry)) { rc = PTR_ERR(lower_dentry); ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " "[%d] on lower_dentry = [%s]\n", __func__, rc, encrypted_and_encoded_name); goto out_d_drop; } if (lower_dentry->d_inode) goto interpose; mount_crypt_stat = &ecryptfs_superblock_to_private( ecryptfs_dentry->d_sb)->mount_crypt_stat; if (!(mount_crypt_stat && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) goto interpose; dput(lower_dentry); rc = ecryptfs_encrypt_and_encode_filename( &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, ecryptfs_dentry->d_name.len); if (rc) { printk(KERN_ERR "%s: Error attempting to encrypt and encode " "filename; rc = [%d]\n", __func__, rc); goto out_d_drop; } mutex_lock(&lower_dir_dentry->d_inode->i_mutex); lower_dentry = lookup_one_len(encrypted_and_encoded_name, lower_dir_dentry, encrypted_and_encoded_name_size); mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); if (IS_ERR(lower_dentry)) { rc = PTR_ERR(lower_dentry); ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " "[%d] on lower_dentry = [%s]\n", __func__, rc, encrypted_and_encoded_name); goto out_d_drop; } interpose: rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry, ecryptfs_dir_inode); goto out; out_d_drop: d_drop(ecryptfs_dentry); out: kfree(encrypted_and_encoded_name); return ERR_PTR(rc); }
/** * ecryptfs_lookup * @ecryptfs_dir_inode: The eCryptfs directory inode * @ecryptfs_dentry: The eCryptfs dentry that we are looking up * @ecryptfs_nd: nameidata; may be NULL * * Find a file on disk. If the file does not exist, then we'll add it to the * dentry cache and continue on to read it from the disk. */ static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, struct dentry *ecryptfs_dentry, struct nameidata *ecryptfs_nd) { char *encrypted_and_encoded_name = NULL; size_t encrypted_and_encoded_name_size; struct ecryptfs_crypt_stat *crypt_stat = NULL; struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; struct ecryptfs_inode_info *inode_info; struct dentry *lower_dir_dentry, *lower_dentry; int rc = 0; ecryptfs_dentry->d_op = &ecryptfs_dops; if ((ecryptfs_dentry->d_name.len == 1 && !strcmp(ecryptfs_dentry->d_name.name, ".")) || (ecryptfs_dentry->d_name.len == 2 && !strcmp(ecryptfs_dentry->d_name.name, ".."))) { goto out_d_drop; } lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, lower_dir_dentry, ecryptfs_dentry->d_name.len); if (IS_ERR(lower_dentry)) { rc = PTR_ERR(lower_dentry); printk(KERN_ERR "%s: lookup_one_len() returned [%d] on " "lower_dentry = [%s]\n", __func__, rc, ecryptfs_dentry->d_name.name); goto out_d_drop; } if (lower_dentry->d_inode) goto lookup_and_interpose; inode_info = ecryptfs_inode_to_private(ecryptfs_dentry->d_inode); if (inode_info) { crypt_stat = &inode_info->crypt_stat; /* TODO: lock for crypt_stat comparison */ if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) ecryptfs_set_default_sizes(crypt_stat); } if (crypt_stat) mount_crypt_stat = crypt_stat->mount_crypt_stat; else mount_crypt_stat = &ecryptfs_superblock_to_private( ecryptfs_dentry->d_sb)->mount_crypt_stat; if (!(crypt_stat && (crypt_stat->flags & ECRYPTFS_ENCRYPT_FILENAMES)) && !(mount_crypt_stat && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) goto lookup_and_interpose; dput(lower_dentry); rc = ecryptfs_encrypt_and_encode_filename( &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, crypt_stat, mount_crypt_stat, ecryptfs_dentry->d_name.name, ecryptfs_dentry->d_name.len); if (rc) { printk(KERN_ERR "%s: Error attempting to encrypt and encode " "filename; rc = [%d]\n", __func__, rc); goto out_d_drop; } lower_dentry = lookup_one_len(encrypted_and_encoded_name, lower_dir_dentry, encrypted_and_encoded_name_size - 1); if (IS_ERR(lower_dentry)) { rc = PTR_ERR(lower_dentry); printk(KERN_ERR "%s: lookup_one_len() returned [%d] on " "lower_dentry = [%s]\n", __func__, rc, encrypted_and_encoded_name); goto out_d_drop; } lookup_and_interpose: rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry, crypt_stat, ecryptfs_dir_inode, ecryptfs_nd); goto out; out_d_drop: d_drop(ecryptfs_dentry); out: kfree(encrypted_and_encoded_name); return ERR_PTR(rc); }
static int ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz) { char *lower_buf; size_t lower_bufsiz; struct dentry *lower_dentry; struct ecryptfs_mount_crypt_stat *mount_crypt_stat; char *plaintext_name; size_t plaintext_name_size; mm_segment_t old_fs; int rc; lower_dentry = ecryptfs_dentry_to_lower(dentry); if (!lower_dentry->d_inode->i_op->readlink) { rc = -EINVAL; goto out; } mount_crypt_stat = &ecryptfs_superblock_to_private( dentry->d_sb)->mount_crypt_stat; /* * If the lower filename is encrypted, it will result in a significantly * longer name. If needed, truncate the name after decode and decrypt. */ if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) lower_bufsiz = PATH_MAX; else lower_bufsiz = bufsiz; /* Released in this function */ lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL); if (lower_buf == NULL) { printk(KERN_ERR "%s: Out of memory whilst attempting to " "kmalloc [%zd] bytes\n", __func__, lower_bufsiz); rc = -ENOMEM; goto out; } old_fs = get_fs(); set_fs(get_ds()); rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, (char __user *)lower_buf, lower_bufsiz); set_fs(old_fs); if (rc >= 0) { rc = ecryptfs_decode_and_decrypt_filename(&plaintext_name, &plaintext_name_size, dentry, lower_buf, rc); if (rc) { printk(KERN_ERR "%s: Error attempting to decode and " "decrypt filename; rc = [%d]\n", __func__, rc); goto out_free_lower_buf; } /* Check for bufsiz <= 0 done in sys_readlinkat() */ rc = copy_to_user(buf, plaintext_name, min((size_t) bufsiz, plaintext_name_size)); if (rc) rc = -EFAULT; else rc = plaintext_name_size; kfree(plaintext_name); fsstack_copy_attr_atime(dentry->d_inode, lower_dentry->d_inode); } out_free_lower_buf: kfree(lower_buf); out: return rc; }
/** * ecryptfs_readdir * @file: The eCryptfs directory file * @ctx: The actor to feed the entries to */ static int ecryptfs_readdir(struct file *file, struct dir_context *ctx) { int rc; struct file *lower_file; struct inode *inode = file_inode(file); struct ecryptfs_getdents_callback buf = { .ctx.actor = ecryptfs_filldir, .caller = ctx, .sb = inode->i_sb, }; lower_file = ecryptfs_file_to_lower(file); lower_file->f_pos = ctx->pos; rc = iterate_dir(lower_file, &buf.ctx); ctx->pos = buf.ctx.pos; if (rc < 0) goto out; if (buf.filldir_called && !buf.entries_written) goto out; if (rc >= 0) fsstack_copy_attr_atime(inode, file_inode(lower_file)); out: return rc; } struct kmem_cache *ecryptfs_file_info_cache; static int read_or_initialize_metadata(struct dentry *dentry) { struct inode *inode = dentry->d_inode; struct ecryptfs_mount_crypt_stat *mount_crypt_stat; struct ecryptfs_crypt_stat *crypt_stat; int rc; crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; mount_crypt_stat = &ecryptfs_superblock_to_private( inode->i_sb)->mount_crypt_stat; #ifdef CONFIG_WTL_ENCRYPTION_FILTER if (crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED && crypt_stat->flags & ECRYPTFS_POLICY_APPLIED && crypt_stat->flags & ECRYPTFS_ENCRYPTED && !(crypt_stat->flags & ECRYPTFS_KEY_VALID) && !(crypt_stat->flags & ECRYPTFS_KEY_SET) && crypt_stat->flags & ECRYPTFS_I_SIZE_INITIALIZED) { crypt_stat->flags |= ECRYPTFS_ENCRYPTED_OTHER_DEVICE; } mutex_lock(&crypt_stat->cs_mutex); if ((mount_crypt_stat->flags & ECRYPTFS_ENABLE_NEW_PASSTHROUGH) && (crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { if (ecryptfs_read_metadata(dentry)) { crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED | ECRYPTFS_ENCRYPTED); rc = 0; goto out; } } else if ((mount_crypt_stat->flags & ECRYPTFS_ENABLE_FILTERING) && (crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { struct dentry *fp_dentry = ecryptfs_inode_to_private(inode)->lower_file->f_dentry; char filename[NAME_MAX+1] = {0}; if (fp_dentry->d_name.len <= NAME_MAX) memcpy(filename, fp_dentry->d_name.name, fp_dentry->d_name.len + 1); if (is_file_name_match(mount_crypt_stat, fp_dentry) || is_file_ext_match(mount_crypt_stat, filename)) { if (ecryptfs_read_metadata(dentry)) crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED | ECRYPTFS_ENCRYPTED); rc = 0; goto out; } } mutex_unlock(&crypt_stat->cs_mutex); #endif mutex_lock(&crypt_stat->cs_mutex); if (crypt_stat->flags & ECRYPTFS_POLICY_APPLIED && crypt_stat->flags & ECRYPTFS_KEY_VALID) { rc = 0; goto out; } rc = ecryptfs_read_metadata(dentry); if (!rc) goto out; #ifdef CONFIG_SDP /* * no passthrough/xattr for sensitive files */ if ((rc) && crypt_stat->flags & ECRYPTFS_DEK_IS_SENSITIVE) goto out; #endif if (mount_crypt_stat->flags & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED) { crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED | ECRYPTFS_ENCRYPTED); rc = 0; goto out; } if (!(mount_crypt_stat->flags & ECRYPTFS_XATTR_METADATA_ENABLED) && !i_size_read(ecryptfs_inode_to_lower(inode))) { rc = ecryptfs_initialize_file(dentry, inode); if (!rc) goto out; } rc = -EIO; out: mutex_unlock(&crypt_stat->cs_mutex); #ifdef CONFIG_SDP if(!rc) { /* * SDP v2.0 : sensitive directory (SDP vault) * Files under sensitive directory automatically becomes sensitive */ struct dentry *p = dentry->d_parent; struct inode *parent_inode = p->d_inode; struct ecryptfs_crypt_stat *parent_crypt_stat = &ecryptfs_inode_to_private(parent_inode)->crypt_stat; if (!(crypt_stat->flags & ECRYPTFS_DEK_IS_SENSITIVE) && ((S_ISDIR(parent_inode->i_mode)) && (parent_crypt_stat->flags & ECRYPTFS_DEK_IS_SENSITIVE))) { rc = ecryptfs_sdp_set_sensitive(parent_crypt_stat->engine_id, dentry); } } #endif return rc; } #if defined(CONFIG_MMC_DW_FMP_ECRYPT_FS) || defined(CONFIG_UFS_FMP_ECRYPT_FS) static void ecryptfs_set_rapages(struct file *file, unsigned int flag) { if (!flag) file->f_ra.ra_pages = 0; else file->f_ra.ra_pages = (unsigned int)file->f_mapping->backing_dev_info->ra_pages; } static int ecryptfs_set_fmpinfo(struct file *file, struct inode *inode, unsigned int set_flag) { struct address_space *mapping = file->f_mapping; if (set_flag) { struct ecryptfs_crypt_stat *crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; struct ecryptfs_mount_crypt_stat *mount_crypt_stat = &ecryptfs_superblock_to_private(inode->i_sb)->mount_crypt_stat; if (strncmp(crypt_stat->cipher, "aesxts", sizeof("aesxts")) && strncmp(crypt_stat->cipher, "aes", sizeof("aes"))) { if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { mapping->plain_text = 1; return 0; } else { ecryptfs_printk(KERN_ERR, "%s: Error invalid file encryption algorithm, inode %lu, filename %s alg %s\n" , __func__, inode->i_ino, file->f_dentry->d_name.name, crypt_stat->cipher); return -EINVAL; } } mapping->iv = crypt_stat->root_iv; mapping->key = crypt_stat->key; mapping->sensitive_data_index = crypt_stat->metadata_size/4096; if (mount_crypt_stat->cipher_code == RFC2440_CIPHER_AES_XTS_256) { mapping->key_length = crypt_stat->key_size * 2; mapping->alg = "aesxts"; } else { mapping->key_length = crypt_stat->key_size; mapping->alg = crypt_stat->cipher; } mapping->hash_tfm = crypt_stat->hash_tfm; #ifdef CONFIG_CRYPTO_FIPS mapping->cc_enable = (mount_crypt_stat->flags & ECRYPTFS_ENABLE_CC)?1:0; #endif } else { mapping->iv = NULL; mapping->key = NULL; mapping->key_length = 0; mapping->sensitive_data_index = 0; mapping->alg = NULL; mapping->hash_tfm = NULL; #ifdef CONFIG_CRYPTO_FIPS mapping->cc_enable = 0; #endif mapping->plain_text = 0; } return 0; } void ecryptfs_propagate_rapages(struct file *file, unsigned int flag) { struct file *f = file; do { if (!f) return; ecryptfs_set_rapages(f, flag); } while(f->f_op->get_lower_file && (f = f->f_op->get_lower_file(f))); } int ecryptfs_propagate_fmpinfo(struct inode *inode, unsigned int flag) { struct file *f = ecryptfs_inode_to_private(inode)->lower_file; do { if (!f) return 0; if (ecryptfs_set_fmpinfo(f, inode, flag)) return -EINVAL; } while(f->f_op->get_lower_file && (f = f->f_op->get_lower_file(f))); return 0; } #endif /** * ecryptfs_open * @inode: inode speciying file to open * @file: Structure to return filled in * * Opens the file specified by inode. * * Returns zero on success; non-zero otherwise */ static int ecryptfs_open(struct inode *inode, struct file *file) { int rc = 0; struct ecryptfs_crypt_stat *crypt_stat = NULL; struct dentry *ecryptfs_dentry = file->f_path.dentry; /* Private value of ecryptfs_dentry allocated in * ecryptfs_lookup() */ struct ecryptfs_file_info *file_info; #ifdef CONFIG_DLP sdp_fs_command_t *cmd = NULL; ssize_t dlp_len = 0; struct knox_dlp_data dlp_data; struct timespec ts; #endif #if defined(CONFIG_MMC_DW_FMP_ECRYPT_FS) || defined(CONFIG_UFS_FMP_ECRYPT_FS) || defined(CONFIG_SDP) struct ecryptfs_mount_crypt_stat *mount_crypt_stat; mount_crypt_stat = &ecryptfs_superblock_to_private( inode->i_sb)->mount_crypt_stat; #endif /* Released in ecryptfs_release or end of function if failure */ file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL); ecryptfs_set_file_private(file, file_info); if (!file_info) { ecryptfs_printk(KERN_ERR, "Error attempting to allocate memory\n"); rc = -ENOMEM; goto out; } crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; mutex_lock(&crypt_stat->cs_mutex); if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) { ecryptfs_printk(KERN_DEBUG, "Setting flags for stat...\n"); /* Policy code enabled in future release */ crypt_stat->flags |= (ECRYPTFS_POLICY_APPLIED | ECRYPTFS_ENCRYPTED); } mutex_unlock(&crypt_stat->cs_mutex); rc = ecryptfs_get_lower_file(ecryptfs_dentry, inode); if (rc) { printk(KERN_ERR "%s: Error attempting to initialize " "the lower file for the dentry with name " "[%pd]; rc = [%d]\n", __func__, ecryptfs_dentry, rc); goto out_free; } if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_ACCMODE) == O_RDONLY && (file->f_flags & O_ACCMODE) != O_RDONLY) { rc = -EPERM; printk(KERN_WARNING "%s: Lower file is RO; eCryptfs " "file must hence be opened RO\n", __func__); goto out_put; } ecryptfs_set_file_lower( file, ecryptfs_inode_to_private(inode)->lower_file); if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) { #ifdef CONFIG_SDP /* * it's possible to have a sensitive directory. (vault) */ if (mount_crypt_stat->flags & ECRYPTFS_MOUNT_SDP_ENABLED) crypt_stat->flags |= ECRYPTFS_DEK_SDP_ENABLED; #endif ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); mutex_lock(&crypt_stat->cs_mutex); crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); mutex_unlock(&crypt_stat->cs_mutex); rc = 0; goto out; } rc = read_or_initialize_metadata(ecryptfs_dentry); if (rc) { #ifdef CONFIG_SDP if(file->f_flags & O_SDP){ printk("Failed to initialize metadata, " "but let it continue cause current call is from SDP API\n"); mutex_lock(&crypt_stat->cs_mutex); crypt_stat->flags &= ~(ECRYPTFS_KEY_VALID); mutex_unlock(&crypt_stat->cs_mutex); rc = 0; /* * Letting this continue doesn't mean to allow read/writing. It will anyway fail later. * * 1. In this stage, ecryptfs_stat won't have key/iv and encryption ctx. * 2. ECRYPTFS_KEY_VALID bit is off, next attempt will try reading metadata again. * 3. Skip DEK conversion. it cannot be done anyway. */ goto out; } #endif goto out_put; } #if defined(CONFIG_MMC_DW_FMP_ECRYPT_FS) || defined(CONFIG_UFS_FMP_ECRYPT_FS) if (mount_crypt_stat->flags & ECRYPTFS_USE_FMP) rc = ecryptfs_propagate_fmpinfo(inode, FMPINFO_SET); else rc = ecryptfs_propagate_fmpinfo(inode, FMPINFO_CLEAR); #endif if (rc) goto out_put; #ifdef CONFIG_SDP if (crypt_stat->flags & ECRYPTFS_DEK_IS_SENSITIVE) { #ifdef CONFIG_SDP_KEY_DUMP if (S_ISREG(ecryptfs_dentry->d_inode->i_mode)) { if(get_sdp_sysfs_key_dump()) { printk("FEK[%s] : ", ecryptfs_dentry->d_name.name); key_dump(crypt_stat->key, 32); } } #endif /* * Need to update sensitive mapping on file open */ if (S_ISREG(ecryptfs_dentry->d_inode->i_mode)) { ecryptfs_set_mapping_sensitive(inode, mount_crypt_stat->userid, TO_SENSITIVE); } if (ecryptfs_is_sdp_locked(crypt_stat->engine_id)) { ecryptfs_printk(KERN_INFO, "ecryptfs_open: persona is locked, rc=%d\n", rc); } else { int dek_type = crypt_stat->sdp_dek.type; ecryptfs_printk(KERN_INFO, "ecryptfs_open: persona is unlocked, rc=%d\n", rc); if(dek_type != DEK_TYPE_AES_ENC) { ecryptfs_printk(KERN_DEBUG, "converting dek...\n"); rc = ecryptfs_sdp_convert_dek(ecryptfs_dentry); ecryptfs_printk(KERN_DEBUG, "conversion ready, rc=%d\n", rc); rc = 0; // TODO: Do we need to return error if conversion fails? } } } #if ECRYPTFS_DEK_DEBUG else { ecryptfs_printk(KERN_INFO, "ecryptfs_open: dek_file_type is protected\n"); } #endif #endif #ifdef CONFIG_DLP if(crypt_stat->flags & ECRYPTFS_DLP_ENABLED) { #if DLP_DEBUG printk("DLP %s: try to open %s with crypt_stat->flags %d\n", __func__, ecryptfs_dentry->d_name.name, crypt_stat->flags); #endif if (dlp_is_locked(mount_crypt_stat->userid)) { printk("%s: DLP locked\n", __func__); rc = -EPERM; goto out_put; } if(in_egroup_p(AID_KNOX_DLP) || in_egroup_p(AID_KNOX_DLP_RESTRICTED)) { dlp_len = ecryptfs_getxattr_lower( ecryptfs_dentry_to_lower(ecryptfs_dentry), KNOX_DLP_XATTR_NAME, &dlp_data, sizeof(dlp_data)); if (dlp_len == sizeof(dlp_data)) { getnstimeofday(&ts); #if DLP_DEBUG printk("DLP %s: current time [%ld/%ld] %s\n", __func__, (long)ts.tv_sec, (long)dlp_data.expiry_time.tv_sec, ecryptfs_dentry->d_name.name); #endif if ((ts.tv_sec > dlp_data.expiry_time.tv_sec) && dlp_isInterestedFile(ecryptfs_dentry->d_name.name)==0) { /* Command to delete expired file */ cmd = sdp_fs_command_alloc(FSOP_DLP_FILE_REMOVE, current->tgid, mount_crypt_stat->userid, mount_crypt_stat->partition_id, inode->i_ino, GFP_KERNEL); rc = -ENOENT; goto out_put; } } else if (dlp_len == -ENODATA) { /* DLP flag is set, but no DLP data. Let it continue, xattr will be set later */ printk("DLP %s: normal file [%s]\n", __func__, ecryptfs_dentry->d_name.name); } else { printk("DLP %s: Error, len [%ld], [%s]\n", __func__, (long)dlp_len, ecryptfs_dentry->d_name.name); rc = -EFAULT; goto out_put; } #if DLP_DEBUG printk("DLP %s: DLP file [%s] opened with tgid %d, %d\n" , __func__, ecryptfs_dentry->d_name.name, current->tgid, in_egroup_p(AID_KNOX_DLP_RESTRICTED)); #endif if(in_egroup_p(AID_KNOX_DLP_RESTRICTED)) { cmd = sdp_fs_command_alloc(FSOP_DLP_FILE_OPENED, current->tgid, mount_crypt_stat->userid, mount_crypt_stat->partition_id, inode->i_ino, GFP_KERNEL); } } else { printk("DLP %s: not DLP app [%s]\n", __func__, current->comm); rc = -EPERM; goto out_put; } } #endif ecryptfs_printk(KERN_DEBUG, "inode w/ addr = [0x%p], i_ino = " "[0x%.16lx] size: [0x%.16llx]\n", inode, inode->i_ino, (unsigned long long)i_size_read(inode)); goto out; out_put: ecryptfs_put_lower_file(inode); out_free: kmem_cache_free(ecryptfs_file_info_cache, ecryptfs_file_to_private(file)); out: #ifdef CONFIG_DLP if(cmd) { sdp_fs_request(cmd, NULL); sdp_fs_command_free(cmd); } #endif return rc; }
/** * ecryptfs_open * @inode: inode speciying file to open * @file: Structure to return filled in * * Opens the file specified by inode. * * Returns zero on success; non-zero otherwise */ static int ecryptfs_open(struct inode *inode, struct file *file) { int rc = 0; struct ecryptfs_crypt_stat *crypt_stat = NULL; struct ecryptfs_mount_crypt_stat *mount_crypt_stat; struct dentry *ecryptfs_dentry = file->f_path.dentry; /* Private value of ecryptfs_dentry allocated in * ecryptfs_lookup() */ struct dentry *lower_dentry; struct ecryptfs_file_info *file_info; mount_crypt_stat = &ecryptfs_superblock_to_private( ecryptfs_dentry->d_sb)->mount_crypt_stat; if ((mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) && ((file->f_flags & O_WRONLY) || (file->f_flags & O_RDWR) || (file->f_flags & O_CREAT) || (file->f_flags & O_TRUNC) || (file->f_flags & O_APPEND))) { printk(KERN_WARNING "Mount has encrypted view enabled; " "files may only be read\n"); rc = -EPERM; goto out; } /* Released in ecryptfs_release or end of function if failure */ file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL); ecryptfs_set_file_private(file, file_info); if (!file_info) { ecryptfs_printk(KERN_ERR, "Error attempting to allocate memory\n"); rc = -ENOMEM; goto out; } lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; mutex_lock(&crypt_stat->cs_mutex); if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) { ecryptfs_printk(KERN_DEBUG, "Setting flags for stat...\n"); /* Policy code enabled in future release */ crypt_stat->flags |= (ECRYPTFS_POLICY_APPLIED | ECRYPTFS_ENCRYPTED); } mutex_unlock(&crypt_stat->cs_mutex); rc = ecryptfs_init_persistent_file(ecryptfs_dentry); if (rc) { printk(KERN_ERR "%s: Error attempting to initialize " "the persistent file for the dentry with name " "[%s]; rc = [%d]\n", __func__, ecryptfs_dentry->d_name.name, rc); goto out_free; } if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_ACCMODE) == O_RDONLY && (file->f_flags & O_ACCMODE) != O_RDONLY) { rc = -EPERM; printk(KERN_WARNING "%s: Lower persistent file is RO; eCryptfs " "file must hence be opened RO\n", __func__); goto out_free; } ecryptfs_set_file_lower( file, ecryptfs_inode_to_private(inode)->lower_file); if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) { ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); mutex_lock(&crypt_stat->cs_mutex); crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); mutex_unlock(&crypt_stat->cs_mutex); rc = 0; goto out; } mutex_lock(&crypt_stat->cs_mutex); if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) || !(crypt_stat->flags & ECRYPTFS_KEY_VALID)) { rc = ecryptfs_read_metadata(ecryptfs_dentry); if (rc) { ecryptfs_printk(KERN_DEBUG, "Valid headers not found\n"); if (!(mount_crypt_stat->flags & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { rc = -EIO; printk(KERN_WARNING "Either the lower file " "is not in a valid eCryptfs format, " "or the key could not be retrieved. " "Plaintext passthrough mode is not " "enabled; returning -EIO\n"); mutex_unlock(&crypt_stat->cs_mutex); goto out_free; } rc = 0; crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); mutex_unlock(&crypt_stat->cs_mutex); goto out; } } mutex_unlock(&crypt_stat->cs_mutex); ecryptfs_printk(KERN_DEBUG, "inode w/ addr = [0x%p], i_ino = " "[0x%.16lx] size: [0x%.16llx]\n", inode, inode->i_ino, (unsigned long long)i_size_read(inode)); goto out; out_free: kmem_cache_free(ecryptfs_file_info_cache, ecryptfs_file_to_private(file)); out: return rc; }
/** * ecryptfs_open * @inode: inode speciying file to open * @file: Structure to return filled in * * Opens the file specified by inode. * * Returns zero on success; non-zero otherwise */ static int ecryptfs_open(struct inode *inode, struct file *file) { int rc = 0; struct ecryptfs_crypt_stat *crypt_stat = NULL; struct ecryptfs_mount_crypt_stat *mount_crypt_stat; struct dentry *ecryptfs_dentry = file->f_path.dentry; /* Private value of ecryptfs_dentry allocated in * ecryptfs_lookup() */ struct dentry *lower_dentry; struct ecryptfs_file_info *file_info; mount_crypt_stat = &ecryptfs_superblock_to_private( ecryptfs_dentry->d_sb)->mount_crypt_stat; if ((mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) && ((file->f_flags & O_WRONLY) || (file->f_flags & O_RDWR) || (file->f_flags & O_CREAT) || (file->f_flags & O_TRUNC) || (file->f_flags & O_APPEND))) { printk(KERN_WARNING "Mount has encrypted view enabled; " "files may only be read\n"); rc = -EPERM; goto out; } /* Released in ecryptfs_release or end of function if failure */ file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL); ecryptfs_set_file_private(file, file_info); if (!file_info) { ecryptfs_printk(KERN_ERR, "Error attempting to allocate memory\n"); rc = -ENOMEM; goto out; } lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; mutex_lock(&crypt_stat->cs_mutex); if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) { ecryptfs_printk(KERN_DEBUG, "Setting flags for stat...\n"); /* Policy code enabled in future release */ crypt_stat->flags |= (ECRYPTFS_POLICY_APPLIED | ECRYPTFS_ENCRYPTED); } mutex_unlock(&crypt_stat->cs_mutex); rc = ecryptfs_get_lower_file(ecryptfs_dentry, inode); if (rc) { printk(KERN_ERR "%s: Error attempting to initialize " "the lower file for the dentry with name " "[%s]; rc = [%d]\n", __func__, ecryptfs_dentry->d_name.name, rc); goto out_free; } if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_ACCMODE) == O_RDONLY && (file->f_flags & O_ACCMODE) != O_RDONLY) { rc = -EPERM; printk(KERN_WARNING "%s: Lower file is RO; eCryptfs " "file must hence be opened RO\n", __func__); goto out_put; } ecryptfs_set_file_lower( file, ecryptfs_inode_to_private(inode)->lower_file); if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) { ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); mutex_lock(&crypt_stat->cs_mutex); crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); mutex_unlock(&crypt_stat->cs_mutex); rc = 0; goto out; } rc = read_or_initialize_metadata(ecryptfs_dentry); if (rc) goto out_put; #ifdef CONFIG_SDP if (crypt_stat->flags & ECRYPTFS_DEK_IS_SENSITIVE) { if (ecryptfs_is_persona_locked(crypt_stat->userid)) { ecryptfs_printk(KERN_INFO, "ecryptfs_open: persona is locked, rc=%d\n", rc); if (file->f_flags & O_SDP) { ecryptfs_printk(KERN_INFO, "ecryptfs_open: O_SDP is set, allow open, rc=%d\n", rc); mutex_lock(&crypt_stat->cs_mutex); crypt_stat->flags &= ~(ECRYPTFS_KEY_VALID); mutex_unlock(&crypt_stat->cs_mutex); } else { mutex_lock(&crypt_stat->cs_mutex); crypt_stat->flags &= ~(ECRYPTFS_KEY_VALID); mutex_unlock(&crypt_stat->cs_mutex); rc = -EACCES; goto out_put; } } else { int dek_type = crypt_stat->sdp_dek.type; ecryptfs_printk(KERN_INFO, "ecryptfs_open: persona is unlocked, rc=%d\n", rc); if(dek_type != DEK_TYPE_AES_ENC) { ecryptfs_printk(KERN_DEBUG, "converting dek...\n"); rc = ecryptfs_sdp_convert_dek(ecryptfs_dentry); ecryptfs_printk(KERN_DEBUG, "conversion ready, rc=%d\n", rc); rc = 0; // TODO: Do we need to return error if conversion fails? /* if(!(file->f_flags & O_SDP)){ ecryptfs_printk(KERN_WARNING, "Busy sensitive file (try again later)\n"); rc = -EBUSY; goto out_put; } */ } } } #if ECRYPTFS_DEK_DEBUG else { ecryptfs_printk(KERN_INFO, "ecryptfs_open: dek_file_type is protected"); } #endif #endif ecryptfs_printk(KERN_DEBUG, "inode w/ addr = [0x%p], i_ino = " "[0x%.16lx] size: [0x%.16llx]\n", inode, inode->i_ino, (unsigned long long)i_size_read(inode)); goto out; out_put: ecryptfs_put_lower_file(inode); out_free: kmem_cache_free(ecryptfs_file_info_cache, ecryptfs_file_to_private(file)); out: return rc; }
/** * ecryptfs_statfs * @sb: The ecryptfs super block * @buf: The struct kstatfs to fill in with stats * * Get the filesystem statistics. Currently, we let this pass right through * to the lower filesystem and take no action ourselves. */ static int ecryptfs_statfs(struct dentry *dentry, struct kstatfs *buf) { return vfs_statfs(ecryptfs_dentry_to_lower(dentry), buf); }
/** * ecryptfs_lookup * @ecryptfs_dir_inode: The eCryptfs directory inode * @ecryptfs_dentry: The eCryptfs dentry that we are looking up * @ecryptfs_nd: nameidata; may be NULL * * Find a file on disk. If the file does not exist, then we'll add it to the * dentry cache and continue on to read it from the disk. */ static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, struct dentry *ecryptfs_dentry, unsigned int flags) { char *encrypted_and_encoded_name = NULL; size_t encrypted_and_encoded_name_size; struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; struct dentry *lower_dir_dentry, *lower_dentry; int rc = 0; lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); mutex_lock(&lower_dir_dentry->d_inode->i_mutex); lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, lower_dir_dentry, ecryptfs_dentry->d_name.len); mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); if (IS_ERR(lower_dentry)) { rc = PTR_ERR(lower_dentry); ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " "[%d] on lower_dentry = [%s]\n", __func__, rc, ecryptfs_dentry->d_name.name); goto out; } if (lower_dentry->d_inode) goto interpose; mount_crypt_stat = &ecryptfs_superblock_to_private( ecryptfs_dentry->d_sb)->mount_crypt_stat; if (!(mount_crypt_stat && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) goto interpose; dput(lower_dentry); rc = ecryptfs_encrypt_and_encode_filename( &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, ecryptfs_dentry->d_name.len); if (rc) { printk(KERN_ERR "%s: Error attempting to encrypt and encode " "filename; rc = [%d]\n", __func__, rc); goto out; } mutex_lock(&lower_dir_dentry->d_inode->i_mutex); #ifdef CONFIG_SDP if(!strncmp(lower_dir_dentry->d_sb->s_type->name, "sdcardfs", 8)) { struct sdcardfs_dentry_info *dinfo = SDCARDFS_D(lower_dir_dentry); int len = strlen(ecryptfs_dentry->d_name.name); int i, numeric = 1; dinfo->under_knox = 1; dinfo->userid = -1; if(IS_UNDER_ROOT(ecryptfs_dentry)) { for(i=0 ; i < len ; i++) if(!isdigit(ecryptfs_dentry->d_name.name[i])) { numeric = 0; break; } if(numeric) { dinfo->userid = simple_strtoul(ecryptfs_dentry->d_name.name, NULL, 10); } } } #endif lower_dentry = lookup_one_len(encrypted_and_encoded_name, lower_dir_dentry, encrypted_and_encoded_name_size); #ifdef CONFIG_SDP if(!strncmp(lower_dir_dentry->d_sb->s_type->name, "sdcardfs", 8)) { struct sdcardfs_dentry_info *dinfo = SDCARDFS_D(lower_dir_dentry); dinfo->under_knox = 0; dinfo->userid = -1; } #endif mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); if (IS_ERR(lower_dentry)) { rc = PTR_ERR(lower_dentry); ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " "[%d] on lower_dentry = [%s]\n", __func__, rc, encrypted_and_encoded_name); goto out; } interpose: rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry, ecryptfs_dir_inode); out: kfree(encrypted_and_encoded_name); return ERR_PTR(rc); }