/** * 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(&(dir->d_inode->i_mutex), I_MUTEX_PARENT); return dir;} static void unlock_dir(struct dentry *dir){ mutex_unlock(&dir->d_inode->i_mutex); dput(dir);} static int ecryptfs_inode_test(struct inode *inode, void *lower_inode){ if (ecryptfs_inode_to_lower(inode) == (struct inode *)lower_inode) return 1; return 0;} 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; inode->i_mapping->backing_dev_info = inode->i_sb->s_bdi; 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(lower_dentry->d_inode, sb); if (IS_ERR(inode)) return PTR_ERR(inode); d_instantiate(dentry, inode); return 0;} /** * 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, NULL); 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_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 */static 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 " "[%s]; rc = [%d]\n", __func__, ecryptfs_dentry->d_name.name, 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. * @nd: nameidata * * Creates a new file. * * Returns zero on success; non-zero on error condition */static intecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, umode_t mode, struct nameidata *nd){ 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) { drop_nlink(ecryptfs_inode); unlock_new_inode(ecryptfs_inode); iput(ecryptfs_inode); goto out; } d_instantiate(ecryptfs_dentry, ecryptfs_inode); unlock_new_inode(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 " "[%s]; rc = [%d]\n", __func__, dentry->d_name.name, 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 = lower_dentry->d_inode; struct ecryptfs_dentry_info *dentry_info; struct vfsmount *lower_mnt; int rc = 0; lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); fsstack_copy_attr_atime(dir_inode, lower_dentry->d_parent->d_inode); BUG_ON(!lower_dentry->d_count); dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); ecryptfs_set_dentry_private(dentry, dentry_info); if (!dentry_info) { printk(KERN_ERR "%s: Out of memory whilst attempting " "to allocate ecryptfs_dentry_info struct\n", __func__); dput(lower_dentry); mntput(lower_mnt); d_drop(dentry); return -ENOMEM; } 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); 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, 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);} 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(old_dentry->d_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_dir_dentry = lock_parent(lower_new_dentry); rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, lower_new_dentry); if (rc || !lower_new_dentry->d_inode) goto out_lock; rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); if (rc) goto out_lock; fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); set_nlink(old_dentry->d_inode, ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink); i_size_write(new_dentry->d_inode, 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){ 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;Lines 1–500 of 1164. 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/** * 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(&(dir->d_inode->i_mutex), I_MUTEX_PARENT); return dir; } static void unlock_dir(struct dentry *dir) { mutex_unlock(&dir->d_inode->i_mutex); dput(dir); } static int ecryptfs_inode_test(struct inode *inode, void *lower_inode) { if (ecryptfs_inode_to_lower(inode) == (struct inode *)lower_inode) return 1; return 0; } 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; inode->i_mapping->backing_dev_info = inode->i_sb->s_bdi; 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(lower_dentry->d_inode, sb); if (IS_ERR(inode)) return PTR_ERR(inode); d_instantiate(dentry, inode); return 0; } /** * 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, NULL); 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_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 */ static 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 " "[%s]; rc = [%d]\n", __func__, ecryptfs_dentry->d_name.name, 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. * @nd: nameidata * * 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, struct nameidata *nd) { 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) { drop_nlink(ecryptfs_inode); unlock_new_inode(ecryptfs_inode); iput(ecryptfs_inode); goto out; } d_instantiate(ecryptfs_dentry, ecryptfs_inode); unlock_new_inode(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 " "[%s]; rc = [%d]\n", __func__, dentry->d_name.name, 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 = lower_dentry->d_inode; struct ecryptfs_dentry_info *dentry_info; struct vfsmount *lower_mnt; int rc = 0; lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); fsstack_copy_attr_atime(dir_inode, lower_dentry->d_parent->d_inode); BUG_ON(!lower_dentry->d_count); dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); ecryptfs_set_dentry_private(dentry, dentry_info); if (!dentry_info) { printk(KERN_ERR "%s: Out of memory whilst attempting " "to allocate ecryptfs_dentry_info struct\n", __func__); dput(lower_dentry); mntput(lower_mnt); d_drop(dentry); return -ENOMEM; } 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); 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, 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); } 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(old_dentry->d_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_dir_dentry = lock_parent(lower_new_dentry); rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, lower_new_dentry); if (rc || !lower_new_dentry->d_inode) goto out_lock; rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); if (rc) goto out_lock; fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); set_nlink(old_dentry->d_inode, ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink); i_size_write(new_dentry->d_inode, 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) { 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;