diff options
Diffstat (limited to 'fs/ecryptfs/inode.c')
| -rw-r--r-- | fs/ecryptfs/inode.c | 1138 |
1 files changed, 1138 insertions, 0 deletions
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c new file mode 100644 index 000000000..fc850b55d --- /dev/null +++ b/fs/ecryptfs/inode.c @@ -0,0 +1,1138 @@ +/** + * eCryptfs: Linux filesystem encryption layer + * + * Copyright (C) 1997-2004 Erez Zadok + * Copyright (C) 2001-2004 Stony Brook University + * Copyright (C) 2004-2007 International Business Machines Corp. + * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com> + * Michael C. Thompsion <mcthomps@us.ibm.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of the + * License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA + * 02111-1307, USA. + */ + +#include <linux/file.h> +#include <linux/vmalloc.h> +#include <linux/pagemap.h> +#include <linux/dcache.h> +#include <linux/namei.h> +#include <linux/mount.h> +#include <linux/crypto.h> +#include <linux/fs_stack.h> +#include <linux/slab.h> +#include <linux/xattr.h> +#include <asm/unaligned.h> +#include "ecryptfs_kernel.h" + +static struct dentry *lock_parent(struct dentry *dentry) +{ + struct dentry *dir; + + dir = dget_parent(dentry); + mutex_lock_nested(&(d_inode(dir)->i_mutex), I_MUTEX_PARENT); + return dir; +} + +static void unlock_dir(struct dentry *dir) +{ + mutex_unlock(&d_inode(dir)->i_mutex); + dput(dir); +} + +static int ecryptfs_inode_test(struct inode *inode, void *lower_inode) +{ + return ecryptfs_inode_to_lower(inode) == lower_inode; +} + +static int ecryptfs_inode_set(struct inode *inode, void *opaque) +{ + struct inode *lower_inode = opaque; + + ecryptfs_set_inode_lower(inode, lower_inode); + fsstack_copy_attr_all(inode, lower_inode); + /* i_size will be overwritten for encrypted regular files */ + fsstack_copy_inode_size(inode, lower_inode); + inode->i_ino = lower_inode->i_ino; + inode->i_version++; + inode->i_mapping->a_ops = &ecryptfs_aops; + + if (S_ISLNK(inode->i_mode)) + inode->i_op = &ecryptfs_symlink_iops; + else if (S_ISDIR(inode->i_mode)) + inode->i_op = &ecryptfs_dir_iops; + else + inode->i_op = &ecryptfs_main_iops; + + if (S_ISDIR(inode->i_mode)) + inode->i_fop = &ecryptfs_dir_fops; + else if (special_file(inode->i_mode)) + init_special_inode(inode, inode->i_mode, inode->i_rdev); + else + inode->i_fop = &ecryptfs_main_fops; + + return 0; +} + +static struct inode *__ecryptfs_get_inode(struct inode *lower_inode, + struct super_block *sb) +{ + struct inode *inode; + + if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) + return ERR_PTR(-EXDEV); + if (!igrab(lower_inode)) + return ERR_PTR(-ESTALE); + inode = iget5_locked(sb, (unsigned long)lower_inode, + ecryptfs_inode_test, ecryptfs_inode_set, + lower_inode); + if (!inode) { + iput(lower_inode); + return ERR_PTR(-EACCES); + } + if (!(inode->i_state & I_NEW)) + iput(lower_inode); + + return inode; +} + +struct inode *ecryptfs_get_inode(struct inode *lower_inode, + struct super_block *sb) +{ + struct inode *inode = __ecryptfs_get_inode(lower_inode, sb); + + if (!IS_ERR(inode) && (inode->i_state & I_NEW)) + unlock_new_inode(inode); + + return inode; +} + +/** + * ecryptfs_interpose + * @lower_dentry: Existing dentry in the lower filesystem + * @dentry: ecryptfs' dentry + * @sb: ecryptfs's super_block + * + * Interposes upper and lower dentries. + * + * Returns zero on success; non-zero otherwise + */ +static int ecryptfs_interpose(struct dentry *lower_dentry, + struct dentry *dentry, struct super_block *sb) +{ + struct inode *inode = ecryptfs_get_inode(d_inode(lower_dentry), sb); + + if (IS_ERR(inode)) + return PTR_ERR(inode); + d_instantiate(dentry, inode); + + return 0; +} + +static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry, + struct inode *inode) +{ + struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); + struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); + struct dentry *lower_dir_dentry; + int rc; + + dget(lower_dentry); + lower_dir_dentry = lock_parent(lower_dentry); + rc = vfs_unlink(lower_dir_inode, lower_dentry, NULL); + 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(inode, ecryptfs_inode_to_lower(inode)->i_nlink); + inode->i_ctime = dir->i_ctime; + d_drop(dentry); +out_unlock: + unlock_dir(lower_dir_dentry); + dput(lower_dentry); + 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 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); + rc = vfs_create(d_inode(lower_dir_dentry), 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(d_inode(lower_dentry), + directory_inode->i_sb); + if (IS_ERR(inode)) { + vfs_unlink(d_inode(lower_dir_dentry), lower_dentry, NULL); + goto out_lock; + } + fsstack_copy_attr_times(directory_inode, d_inode(lower_dir_dentry)); + fsstack_copy_inode_size(directory_inode, d_inode(lower_dir_dentry)); +out_lock: + unlock_dir(lower_dir_dentry); + return inode; +} + +/** + * ecryptfs_initialize_file + * + * Cause the file to be changed from a basic empty file to an ecryptfs + * file with a header and first data page. + * + * Returns zero on success + */ +int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry, + struct inode *ecryptfs_inode) +{ + struct ecryptfs_crypt_stat *crypt_stat = + &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat; + int rc = 0; + + if (S_ISDIR(ecryptfs_inode->i_mode)) { + ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); + crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); + goto out; + } + ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); + rc = ecryptfs_new_file_context(ecryptfs_inode); + if (rc) { + ecryptfs_printk(KERN_ERR, "Error creating new file " + "context; rc = [%d]\n", rc); + goto out; + } + rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_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; + } + rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode); + if (rc) + printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); + ecryptfs_put_lower_file(ecryptfs_inode); +out: + return rc; +} + +/** + * ecryptfs_create + * @dir: The inode of the directory in which to create the file. + * @dentry: The eCryptfs dentry + * @mode: The mode of the new file. + * + * Creates a new file. + * + * Returns zero on success; non-zero on error condition + */ +static int +ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, + umode_t mode, bool excl) +{ + struct inode *ecryptfs_inode; + int rc; + + ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry, + mode); + if (unlikely(IS_ERR(ecryptfs_inode))) { + ecryptfs_printk(KERN_WARNING, "Failed to create file in" + "lower filesystem\n"); + rc = PTR_ERR(ecryptfs_inode); + goto out; + } + /* At this point, a file exists on "disk"; we need to make sure + * that this on disk file is prepared to be an ecryptfs file */ + rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode); + if (rc) { + ecryptfs_do_unlink(directory_inode, ecryptfs_dentry, + ecryptfs_inode); + make_bad_inode(ecryptfs_inode); + unlock_new_inode(ecryptfs_inode); + iput(ecryptfs_inode); + goto out; + } + unlock_new_inode(ecryptfs_inode); + d_instantiate(ecryptfs_dentry, ecryptfs_inode); +out: + return rc; +} + +static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode) +{ + struct ecryptfs_crypt_stat *crypt_stat; + int rc; + + rc = ecryptfs_get_lower_file(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__, + dentry, rc); + return rc; + } + + crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; + /* TODO: lock for crypt_stat comparison */ + if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) + ecryptfs_set_default_sizes(crypt_stat); + + rc = ecryptfs_read_and_validate_header_region(inode); + ecryptfs_put_lower_file(inode); + if (rc) { + rc = ecryptfs_read_and_validate_xattr_region(dentry, inode); + if (!rc) + crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; + } + + /* Must return 0 to allow non-eCryptfs files to be looked up, too */ + return 0; +} + +/** + * ecryptfs_lookup_interpose - Dentry interposition for a lookup + */ +static int ecryptfs_lookup_interpose(struct dentry *dentry, + struct dentry *lower_dentry, + struct inode *dir_inode) +{ + struct inode *inode, *lower_inode = d_inode(lower_dentry); + struct ecryptfs_dentry_info *dentry_info; + struct vfsmount *lower_mnt; + int rc = 0; + + dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); + if (!dentry_info) { + printk(KERN_ERR "%s: Out of memory whilst attempting " + "to allocate ecryptfs_dentry_info struct\n", + __func__); + dput(lower_dentry); + return -ENOMEM; + } + + lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); + fsstack_copy_attr_atime(dir_inode, d_inode(lower_dentry->d_parent)); + BUG_ON(!d_count(lower_dentry)); + + ecryptfs_set_dentry_private(dentry, dentry_info); + dentry_info->lower_path.mnt = lower_mnt; + dentry_info->lower_path.dentry = lower_dentry; + + if (d_really_is_negative(lower_dentry)) { + /* We want to add because we couldn't find in lower */ + d_add(dentry, NULL); + return 0; + } + inode = __ecryptfs_get_inode(lower_inode, dir_inode->i_sb); + if (IS_ERR(inode)) { + printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n", + __func__, PTR_ERR(inode)); + return PTR_ERR(inode); + } + if (S_ISREG(inode->i_mode)) { + rc = ecryptfs_i_size_read(dentry, inode); + if (rc) { + make_bad_inode(inode); + return rc; + } + } + + if (inode->i_state & I_NEW) + unlock_new_inode(inode); + d_add(dentry, inode); + + 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, + 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(&d_inode(lower_dir_dentry)->i_mutex); + lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, + lower_dir_dentry, + ecryptfs_dentry->d_name.len); + mutex_unlock(&d_inode(lower_dir_dentry)->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 = [%pd]\n", __func__, rc, + ecryptfs_dentry); + goto out; + } + if (d_really_is_positive(lower_dentry)) + 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(&d_inode(lower_dir_dentry)->i_mutex); + lower_dentry = lookup_one_len(encrypted_and_encoded_name, + lower_dir_dentry, + encrypted_and_encoded_name_size); + mutex_unlock(&d_inode(lower_dir_dentry)->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); +} + +static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, + struct dentry *new_dentry) +{ + struct dentry *lower_old_dentry; + struct dentry *lower_new_dentry; + struct dentry *lower_dir_dentry; + u64 file_size_save; + int rc; + + file_size_save = i_size_read(d_inode(old_dentry)); + 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_dir_dentry = lock_parent(lower_new_dentry); + rc = vfs_link(lower_old_dentry, d_inode(lower_dir_dentry), + lower_new_dentry, NULL); + if (rc || d_really_is_negative(lower_new_dentry)) + goto out_lock; + rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); + if (rc) + goto out_lock; + fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); + fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); + set_nlink(d_inode(old_dentry), + ecryptfs_inode_to_lower(d_inode(old_dentry))->i_nlink); + i_size_write(d_inode(new_dentry), file_size_save); +out_lock: + unlock_dir(lower_dir_dentry); + dput(lower_new_dentry); + dput(lower_old_dentry); + return rc; +} + +static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) +{ + return ecryptfs_do_unlink(dir, dentry, d_inode(dentry)); +} + +static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, + const char *symname) +{ + int rc; + struct dentry *lower_dentry; + struct dentry *lower_dir_dentry; + char *encoded_symname; + size_t encoded_symlen; + struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; + + lower_dentry = ecryptfs_dentry_to_lower(dentry); + dget(lower_dentry); + lower_dir_dentry = lock_parent(lower_dentry); + mount_crypt_stat = &ecryptfs_superblock_to_private( + dir->i_sb)->mount_crypt_stat; + rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, + &encoded_symlen, + NULL, + mount_crypt_stat, symname, + strlen(symname)); + if (rc) + goto out_lock; + rc = vfs_symlink(d_inode(lower_dir_dentry), lower_dentry, + encoded_symname); + kfree(encoded_symname); + if (rc || d_really_is_negative(lower_dentry)) + goto out_lock; + rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); + if (rc) + goto out_lock; + fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); + fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); +out_lock: + unlock_dir(lower_dir_dentry); + dput(lower_dentry); + if (d_really_is_negative(dentry)) + d_drop(dentry); + return rc; +} + +static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) +{ + int rc; + struct dentry *lower_dentry; + struct dentry *lower_dir_dentry; + + lower_dentry = ecryptfs_dentry_to_lower(dentry); + lower_dir_dentry = lock_parent(lower_dentry); + rc = vfs_mkdir(d_inode(lower_dir_dentry), lower_dentry, mode); + if (rc || d_really_is_negative(lower_dentry)) + goto out; + rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); + if (rc) + goto out; + fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); + fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); + set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink); +out: + unlock_dir(lower_dir_dentry); + if (d_really_is_negative(dentry)) + d_drop(dentry); + return rc; +} + +static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) +{ + struct dentry *lower_dentry; + struct dentry *lower_dir_dentry; + int rc; + + lower_dentry = ecryptfs_dentry_to_lower(dentry); + dget(dentry); + lower_dir_dentry = lock_parent(lower_dentry); + dget(lower_dentry); + rc = vfs_rmdir(d_inode(lower_dir_dentry), lower_dentry); + dput(lower_dentry); + if (!rc && d_really_is_positive(dentry)) + clear_nlink(d_inode(dentry)); + fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); + set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink); + unlock_dir(lower_dir_dentry); + if (!rc) + d_drop(dentry); + dput(dentry); + return rc; +} + +static int +ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) +{ + int rc; + struct dentry *lower_dentry; + struct dentry *lower_dir_dentry; + + lower_dentry = ecryptfs_dentry_to_lower(dentry); + lower_dir_dentry = lock_parent(lower_dentry); + rc = vfs_mknod(d_inode(lower_dir_dentry), lower_dentry, mode, dev); + if (rc || d_really_is_negative(lower_dentry)) + goto out; + rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); + if (rc) + goto out; + fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); + fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); +out: + unlock_dir(lower_dir_dentry); + if (d_really_is_negative(dentry)) + d_drop(dentry); + 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; + + 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 = d_inode(new_dentry); + 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(d_inode(lower_old_dir_dentry), lower_old_dentry, + d_inode(lower_new_dir_dentry), lower_new_dentry, + NULL, 0); + 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, d_inode(lower_new_dir_dentry)); + if (new_dir != old_dir) + fsstack_copy_attr_all(old_dir, d_inode(lower_old_dir_dentry)); +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); + return rc; +} + +static char *ecryptfs_readlink_lower(struct dentry *dentry, size_t *bufsiz) +{ + struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); + char *lower_buf; + char *buf; + mm_segment_t old_fs; + int rc; + + lower_buf = kmalloc(PATH_MAX, GFP_KERNEL); + if (!lower_buf) + return ERR_PTR(-ENOMEM); + old_fs = get_fs(); + set_fs(get_ds()); + rc = d_inode(lower_dentry)->i_op->readlink(lower_dentry, + (char __user *)lower_buf, + PATH_MAX); + set_fs(old_fs); + if (rc < 0) + goto out; + rc = ecryptfs_decode_and_decrypt_filename(&buf, bufsiz, dentry->d_sb, + lower_buf, rc); +out: + kfree(lower_buf); + return rc ? ERR_PTR(rc) : buf; +} + +static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) +{ + size_t len; + char *buf = ecryptfs_readlink_lower(dentry, &len); + if (IS_ERR(buf)) + goto out; + fsstack_copy_attr_atime(d_inode(dentry), + d_inode(ecryptfs_dentry_to_lower(dentry))); + buf[len] = '\0'; +out: + nd_set_link(nd, buf); + return NULL; +} + +/** + * upper_size_to_lower_size + * @crypt_stat: Crypt_stat associated with file + * @upper_size: Size of the upper file + * + * Calculate the required size of the lower file based on the + * specified size of the upper file. This calculation is based on the + * number of headers in the underlying file and the extent size. + * + * Returns Calculated size of the lower file. + */ +static loff_t +upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, + loff_t upper_size) +{ + loff_t lower_size; + + lower_size = ecryptfs_lower_header_size(crypt_stat); + if (upper_size != 0) { + loff_t num_extents; + + num_extents = upper_size >> crypt_stat->extent_shift; + if (upper_size & ~crypt_stat->extent_mask) + num_extents++; + lower_size += (num_extents * crypt_stat->extent_size); + } + return lower_size; +} + +/** + * truncate_upper + * @dentry: The ecryptfs layer dentry + * @ia: Address of the ecryptfs inode's attributes + * @lower_ia: Address of the lower inode's attributes + * + * Function to handle truncations modifying the size of the file. Note + * that the file sizes are interpolated. When expanding, we are simply + * writing strings of 0's out. When truncating, we truncate the upper + * inode and update the lower_ia according to the page index + * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, + * the caller must use lower_ia in a call to notify_change() to perform + * the truncation of the lower inode. + * + * Returns zero on success; non-zero otherwise + */ +static int truncate_upper(struct dentry *dentry, struct iattr *ia, + struct iattr *lower_ia) +{ + int rc = 0; + struct inode *inode = d_inode(dentry); + struct ecryptfs_crypt_stat *crypt_stat; + loff_t i_size = i_size_read(inode); + loff_t lower_size_before_truncate; + loff_t lower_size_after_truncate; + + if (unlikely((ia->ia_size == i_size))) { + lower_ia->ia_valid &= ~ATTR_SIZE; + return 0; + } + rc = ecryptfs_get_lower_file(dentry, inode); + if (rc) + return rc; + crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; + /* Switch on growing or shrinking file */ + if (ia->ia_size > i_size) { + char zero[] = { 0x00 }; + + lower_ia->ia_valid &= ~ATTR_SIZE; + /* Write a single 0 at the last position of the file; + * this triggers code that will fill in 0's throughout + * the intermediate portion of the previous end of the + * file and the new and of the file */ + rc = ecryptfs_write(inode, zero, + (ia->ia_size - 1), 1); + } else { /* ia->ia_size < i_size_read(inode) */ + /* We're chopping off all the pages down to the page + * in which ia->ia_size is located. Fill in the end of + * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to + * PAGE_CACHE_SIZE with zeros. */ + size_t num_zeros = (PAGE_CACHE_SIZE + - (ia->ia_size & ~PAGE_CACHE_MASK)); + + if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { + truncate_setsize(inode, ia->ia_size); + lower_ia->ia_size = ia->ia_size; + lower_ia->ia_valid |= ATTR_SIZE; + goto out; + } + if (num_zeros) { + char *zeros_virt; + + zeros_virt = kzalloc(num_zeros, GFP_KERNEL); + if (!zeros_virt) { + rc = -ENOMEM; + goto out; + } + rc = ecryptfs_write(inode, zeros_virt, + ia->ia_size, num_zeros); + kfree(zeros_virt); + if (rc) { + printk(KERN_ERR "Error attempting to zero out " + "the remainder of the end page on " + "reducing truncate; rc = [%d]\n", rc); + goto out; + } + } + truncate_setsize(inode, ia->ia_size); + rc = ecryptfs_write_inode_size_to_metadata(inode); + if (rc) { + printk(KERN_ERR "Problem with " + "ecryptfs_write_inode_size_to_metadata; " + "rc = [%d]\n", rc); + goto out; + } + /* We are reducing the size of the ecryptfs file, and need to + * know if we need to reduce the size of the lower file. */ + lower_size_before_truncate = + upper_size_to_lower_size(crypt_stat, i_size); + lower_size_after_truncate = + upper_size_to_lower_size(crypt_stat, ia->ia_size); + if (lower_size_after_truncate < lower_size_before_truncate) { + lower_ia->ia_size = lower_size_after_truncate; + lower_ia->ia_valid |= ATTR_SIZE; + } else + lower_ia->ia_valid &= ~ATTR_SIZE; + } +out: + ecryptfs_put_lower_file(inode); + return rc; +} + +static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset) +{ + struct ecryptfs_crypt_stat *crypt_stat; + loff_t lower_oldsize, lower_newsize; + + crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; + lower_oldsize = upper_size_to_lower_size(crypt_stat, + i_size_read(inode)); + lower_newsize = upper_size_to_lower_size(crypt_stat, offset); + if (lower_newsize > lower_oldsize) { + /* + * The eCryptfs inode and the new *lower* size are mixed here + * because we may not have the lower i_mutex held and/or it may + * not be appropriate to call inode_newsize_ok() with inodes + * from other filesystems. + */ + return inode_newsize_ok(inode, lower_newsize); + } + + return 0; +} + +/** + * ecryptfs_truncate + * @dentry: The ecryptfs layer dentry + * @new_length: The length to expand the file to + * + * Simple function that handles the truncation of an eCryptfs inode and + * its corresponding lower inode. + * + * Returns zero on success; non-zero otherwise + */ +int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) +{ + struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; + struct iattr lower_ia = { .ia_valid = 0 }; + int rc; + + rc = ecryptfs_inode_newsize_ok(d_inode(dentry), new_length); + if (rc) + return rc; + + rc = truncate_upper(dentry, &ia, &lower_ia); + if (!rc && lower_ia.ia_valid & ATTR_SIZE) { + struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); + + mutex_lock(&d_inode(lower_dentry)->i_mutex); + rc = notify_change(lower_dentry, &lower_ia, NULL); + mutex_unlock(&d_inode(lower_dentry)->i_mutex); + } + return rc; +} + +static int +ecryptfs_permission(struct inode *inode, int mask) +{ + return inode_permission(ecryptfs_inode_to_lower(inode), mask); +} + +/** + * ecryptfs_setattr + * @dentry: dentry handle to the inode to modify + * @ia: Structure with flags of what to change and values + * + * Updates the metadata of an inode. If the update is to the size + * i.e. truncation, then ecryptfs_truncate will handle the size modification + * of both the ecryptfs inode and the lower inode. + * + * All other metadata changes will be passed right to the lower filesystem, + * and we will just update our inode to look like the lower. + */ +static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) +{ + int rc = 0; + struct dentry *lower_dentry; + struct iattr lower_ia; + struct inode *inode; + struct inode *lower_inode; + struct ecryptfs_crypt_stat *crypt_stat; + + crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; + if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) + ecryptfs_init_crypt_stat(crypt_stat); + inode = d_inode(dentry); + lower_inode = ecryptfs_inode_to_lower(inode); + lower_dentry = ecryptfs_dentry_to_lower(dentry); + mutex_lock(&crypt_stat->cs_mutex); + if (d_is_dir(dentry)) + crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); + else if (d_is_reg(dentry) + && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) + || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { + struct ecryptfs_mount_crypt_stat *mount_crypt_stat; + + 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); + goto out; + } + rc = ecryptfs_read_metadata(dentry); + ecryptfs_put_lower_file(inode); + if (rc) { + 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; + } + rc = 0; + crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED + | ECRYPTFS_ENCRYPTED); + } + } + mutex_unlock(&crypt_stat->cs_mutex); + + rc = inode_change_ok(inode, ia); + if (rc) + goto out; + if (ia->ia_valid & ATTR_SIZE) { + rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size); + if (rc) + goto out; + } + + memcpy(&lower_ia, ia, sizeof(lower_ia)); + if (ia->ia_valid & ATTR_FILE) + lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); + if (ia->ia_valid & ATTR_SIZE) { + rc = truncate_upper(dentry, ia, &lower_ia); + if (rc < 0) + goto out; + } + + /* + * mode change is for clearing setuid/setgid bits. Allow lower fs + * to interpret this in its own way. + */ + if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) + lower_ia.ia_valid &= ~ATTR_MODE; + + mutex_lock(&d_inode(lower_dentry)->i_mutex); + rc = notify_change(lower_dentry, &lower_ia, NULL); + mutex_unlock(&d_inode(lower_dentry)->i_mutex); +out: + fsstack_copy_attr_all(inode, lower_inode); + return rc; +} + +static int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, + struct kstat *stat) +{ + struct ecryptfs_mount_crypt_stat *mount_crypt_stat; + int rc = 0; + + mount_crypt_stat = &ecryptfs_superblock_to_private( + dentry->d_sb)->mount_crypt_stat; + generic_fillattr(d_inode(dentry), stat); + if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { + char *target; + size_t targetsiz; + + target = ecryptfs_readlink_lower(dentry, &targetsiz); + if (!IS_ERR(target)) { + kfree(target); + stat->size = targetsiz; + } else { + rc = PTR_ERR(target); + } + } + return rc; +} + +static int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, + struct kstat *stat) +{ + struct kstat lower_stat; + int rc; + + rc = vfs_getattr(ecryptfs_dentry_to_lower_path(dentry), &lower_stat); + if (!rc) { + fsstack_copy_attr_all(d_inode(dentry), + ecryptfs_inode_to_lower(d_inode(dentry))); + generic_fillattr(d_inode(dentry), stat); + stat->blocks = lower_stat.blocks; + } + return rc; +} + +int +ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, + size_t size, int flags) +{ + int rc = 0; + struct dentry *lower_dentry; + + lower_dentry = ecryptfs_dentry_to_lower(dentry); + if (!d_inode(lower_dentry)->i_op->setxattr) { + rc = -EOPNOTSUPP; + goto out; + } + + rc = vfs_setxattr(lower_dentry, name, value, size, flags); + if (!rc && d_really_is_positive(dentry)) + fsstack_copy_attr_all(d_inode(dentry), d_inode(lower_dentry)); +out: + return rc; +} + +ssize_t +ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, + void *value, size_t size) +{ + int rc = 0; + + if (!d_inode(lower_dentry)->i_op->getxattr) { + rc = -EOPNOTSUPP; + goto out; + } + mutex_lock(&d_inode(lower_dentry)->i_mutex); + rc = d_inode(lower_dentry)->i_op->getxattr(lower_dentry, name, value, + size); + mutex_unlock(&d_inode(lower_dentry)->i_mutex); +out: + return rc; +} + +static ssize_t +ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, + size_t size) +{ + return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, + value, size); +} + +static ssize_t +ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) +{ + int rc = 0; + struct dentry *lower_dentry; + + lower_dentry = ecryptfs_dentry_to_lower(dentry); + if (!d_inode(lower_dentry)->i_op->listxattr) { + rc = -EOPNOTSUPP; + goto out; + } + mutex_lock(&d_inode(lower_dentry)->i_mutex); + rc = d_inode(lower_dentry)->i_op->listxattr(lower_dentry, list, size); + mutex_unlock(&d_inode(lower_dentry)->i_mutex); +out: + return rc; +} + +static int ecryptfs_removexattr(struct dentry *dentry, const char *name) +{ + int rc = 0; + struct dentry *lower_dentry; + + lower_dentry = ecryptfs_dentry_to_lower(dentry); + if (!d_inode(lower_dentry)->i_op->removexattr) { + rc = -EOPNOTSUPP; + goto out; + } + mutex_lock(&d_inode(lower_dentry)->i_mutex); + rc = d_inode(lower_dentry)->i_op->removexattr(lower_dentry, name); + mutex_unlock(&d_inode(lower_dentry)->i_mutex); +out: + return rc; +} + +const struct inode_operations ecryptfs_symlink_iops = { + .readlink = generic_readlink, + .follow_link = ecryptfs_follow_link, + .put_link = kfree_put_link, + .permission = ecryptfs_permission, + .setattr = ecryptfs_setattr, + .getattr = ecryptfs_getattr_link, + .setxattr = ecryptfs_setxattr, + .getxattr = ecryptfs_getxattr, + .listxattr = ecryptfs_listxattr, + .removexattr = ecryptfs_removexattr +}; + +const struct inode_operations ecryptfs_dir_iops = { + .create = ecryptfs_create, + .lookup = ecryptfs_lookup, + .link = ecryptfs_link, + .unlink = ecryptfs_unlink, + .symlink = ecryptfs_symlink, + .mkdir = ecryptfs_mkdir, + .rmdir = ecryptfs_rmdir, + .mknod = ecryptfs_mknod, + .rename = ecryptfs_rename, + .permission = ecryptfs_permission, + .setattr = ecryptfs_setattr, + .setxattr = ecryptfs_setxattr, + .getxattr = ecryptfs_getxattr, + .listxattr = ecryptfs_listxattr, + .removexattr = ecryptfs_removexattr +}; + +const struct inode_operations ecryptfs_main_iops = { + .permission = ecryptfs_permission, + .setattr = ecryptfs_setattr, + .getattr = ecryptfs_getattr, + .setxattr = ecryptfs_setxattr, + .getxattr = ecryptfs_getxattr, + .listxattr = ecryptfs_listxattr, + .removexattr = ecryptfs_removexattr +}; |