![Tyler Hicks](/assets/img/avatar_default.png)
A feature was added to the eCryptfs umount helper to automatically unlink the keys used for an eCryptfs mount from the kernel keyring upon umount. This patch keeps the unrecognized mount option warnings for ecryptfs_unlink_sigs out of the logs. Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
208 lines
6.5 KiB
C
208 lines
6.5 KiB
C
/**
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* eCryptfs: Linux filesystem encryption layer
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*
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* Copyright (C) 1997-2003 Erez Zadok
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* Copyright (C) 2001-2003 Stony Brook University
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* Copyright (C) 2004-2006 International Business Machines Corp.
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* Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
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* Michael C. Thompson <mcthomps@us.ibm.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*/
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#include <linux/fs.h>
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#include <linux/mount.h>
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#include <linux/key.h>
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#include <linux/seq_file.h>
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#include <linux/file.h>
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#include <linux/crypto.h>
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#include "ecryptfs_kernel.h"
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struct kmem_cache *ecryptfs_inode_info_cache;
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/**
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* ecryptfs_alloc_inode - allocate an ecryptfs inode
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* @sb: Pointer to the ecryptfs super block
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*
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* Called to bring an inode into existence.
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*
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* Only handle allocation, setting up structures should be done in
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* ecryptfs_read_inode. This is because the kernel, between now and
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* then, will 0 out the private data pointer.
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*
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* Returns a pointer to a newly allocated inode, NULL otherwise
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*/
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static struct inode *ecryptfs_alloc_inode(struct super_block *sb)
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{
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struct ecryptfs_inode_info *inode_info;
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struct inode *inode = NULL;
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inode_info = kmem_cache_alloc(ecryptfs_inode_info_cache, GFP_KERNEL);
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if (unlikely(!inode_info))
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goto out;
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ecryptfs_init_crypt_stat(&inode_info->crypt_stat);
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mutex_init(&inode_info->lower_file_mutex);
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inode_info->lower_file = NULL;
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inode = &inode_info->vfs_inode;
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out:
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return inode;
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}
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/**
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* ecryptfs_destroy_inode
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* @inode: The ecryptfs inode
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*
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* This is used during the final destruction of the inode. All
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* allocation of memory related to the inode, including allocated
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* memory in the crypt_stat struct, will be released here. This
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* function also fput()'s the persistent file for the lower inode.
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* There should be no chance that this deallocation will be missed.
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*/
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static void ecryptfs_destroy_inode(struct inode *inode)
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{
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struct ecryptfs_inode_info *inode_info;
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inode_info = ecryptfs_inode_to_private(inode);
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mutex_lock(&inode_info->lower_file_mutex);
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if (inode_info->lower_file) {
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struct dentry *lower_dentry =
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inode_info->lower_file->f_dentry;
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BUG_ON(!lower_dentry);
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if (lower_dentry->d_inode) {
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fput(inode_info->lower_file);
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inode_info->lower_file = NULL;
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d_drop(lower_dentry);
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}
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}
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mutex_unlock(&inode_info->lower_file_mutex);
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ecryptfs_destroy_crypt_stat(&inode_info->crypt_stat);
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kmem_cache_free(ecryptfs_inode_info_cache, inode_info);
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}
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/**
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* ecryptfs_init_inode
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* @inode: The ecryptfs inode
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*
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* Set up the ecryptfs inode.
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*/
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void ecryptfs_init_inode(struct inode *inode, struct inode *lower_inode)
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{
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ecryptfs_set_inode_lower(inode, lower_inode);
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inode->i_ino = lower_inode->i_ino;
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inode->i_version++;
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inode->i_op = &ecryptfs_main_iops;
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inode->i_fop = &ecryptfs_main_fops;
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inode->i_mapping->a_ops = &ecryptfs_aops;
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}
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/**
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* ecryptfs_put_super
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* @sb: Pointer to the ecryptfs super block
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*
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* Final actions when unmounting a file system.
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* This will handle deallocation and release of our private data.
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*/
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static void ecryptfs_put_super(struct super_block *sb)
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{
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struct ecryptfs_sb_info *sb_info = ecryptfs_superblock_to_private(sb);
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ecryptfs_destroy_mount_crypt_stat(&sb_info->mount_crypt_stat);
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kmem_cache_free(ecryptfs_sb_info_cache, sb_info);
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ecryptfs_set_superblock_private(sb, NULL);
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}
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/**
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* ecryptfs_statfs
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* @sb: The ecryptfs super block
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* @buf: The struct kstatfs to fill in with stats
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*
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* Get the filesystem statistics. Currently, we let this pass right through
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* to the lower filesystem and take no action ourselves.
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*/
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static int ecryptfs_statfs(struct dentry *dentry, struct kstatfs *buf)
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{
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return vfs_statfs(ecryptfs_dentry_to_lower(dentry), buf);
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}
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/**
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* ecryptfs_clear_inode
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* @inode - The ecryptfs inode
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*
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* Called by iput() when the inode reference count reached zero
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* and the inode is not hashed anywhere. Used to clear anything
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* that needs to be, before the inode is completely destroyed and put
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* on the inode free list. We use this to drop out reference to the
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* lower inode.
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*/
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static void ecryptfs_clear_inode(struct inode *inode)
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{
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iput(ecryptfs_inode_to_lower(inode));
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}
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/**
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* ecryptfs_show_options
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*
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* Prints the mount options for a given superblock.
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* Returns zero; does not fail.
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*/
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static int ecryptfs_show_options(struct seq_file *m, struct vfsmount *mnt)
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{
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struct super_block *sb = mnt->mnt_sb;
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struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
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&ecryptfs_superblock_to_private(sb)->mount_crypt_stat;
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struct ecryptfs_global_auth_tok *walker;
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mutex_lock(&mount_crypt_stat->global_auth_tok_list_mutex);
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list_for_each_entry(walker,
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&mount_crypt_stat->global_auth_tok_list,
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mount_crypt_stat_list) {
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if (walker->flags & ECRYPTFS_AUTH_TOK_FNEK)
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seq_printf(m, ",ecryptfs_fnek_sig=%s", walker->sig);
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else
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seq_printf(m, ",ecryptfs_sig=%s", walker->sig);
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}
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mutex_unlock(&mount_crypt_stat->global_auth_tok_list_mutex);
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seq_printf(m, ",ecryptfs_cipher=%s",
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mount_crypt_stat->global_default_cipher_name);
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if (mount_crypt_stat->global_default_cipher_key_size)
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seq_printf(m, ",ecryptfs_key_bytes=%zd",
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mount_crypt_stat->global_default_cipher_key_size);
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if (mount_crypt_stat->flags & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)
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seq_printf(m, ",ecryptfs_passthrough");
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if (mount_crypt_stat->flags & ECRYPTFS_XATTR_METADATA_ENABLED)
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seq_printf(m, ",ecryptfs_xattr_metadata");
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if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED)
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seq_printf(m, ",ecryptfs_encrypted_view");
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if (mount_crypt_stat->flags & ECRYPTFS_UNLINK_SIGS)
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seq_printf(m, ",ecryptfs_unlink_sigs");
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return 0;
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}
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const struct super_operations ecryptfs_sops = {
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.alloc_inode = ecryptfs_alloc_inode,
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.destroy_inode = ecryptfs_destroy_inode,
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.drop_inode = generic_delete_inode,
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.put_super = ecryptfs_put_super,
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.statfs = ecryptfs_statfs,
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.remount_fs = NULL,
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.clear_inode = ecryptfs_clear_inode,
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.show_options = ecryptfs_show_options
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};
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