/** * 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); 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; } interpose: rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry, ecryptfs_dir_inode); 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 * @flags: lookup flags * * 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; struct ecryptfs_mount_crypt_stat *mount_crypt_stat; struct dentry *lower_dir_dentry, *lower_dentry; const char *name = ecryptfs_dentry->d_name.name; size_t len = ecryptfs_dentry->d_name.len; struct dentry *res; int rc = 0; lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); 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)) { rc = ecryptfs_encrypt_and_encode_filename( &encrypted_and_encoded_name, &len, mount_crypt_stat, name, len); if (rc) { printk(KERN_ERR "%s: Error attempting to encrypt and encode " "filename; rc = [%d]\n", __func__, rc); return ERR_PTR(rc); } name = encrypted_and_encoded_name; } lower_dentry = lookup_one_len_unlocked(name, lower_dir_dentry, len); if (IS_ERR(lower_dentry)) { ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " "[%ld] on lower_dentry = [%s]\n", __func__, PTR_ERR(lower_dentry), name); res = ERR_CAST(lower_dentry); } else { res = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry); } kfree(encrypted_and_encoded_name); return res; }
/** * 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); }