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762c69685f
We need to get the underlying dentry of parent; sure, absent the races it is the parent of underlying dentry, but there's nothing to prevent losing a timeslice to preemtion in the middle of evaluation of lower_dentry->d_parent->d_inode, having another process move lower_dentry around and have its (ex)parent not pinned anymore and freed on memory pressure. Then we regain CPU and try to fetch ->d_inode from memory that is freed by that point. dentry->d_parent *is* stable here - it's an argument of ->lookup() and we are guaranteed that it won't be moved anywhere until we feed it to d_add/d_splice_alias. So we safely go that way to get to its underlying dentry. Cc: stable@vger.kernel.org # since 2009 or so Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
1156 lines
32 KiB
C
1156 lines
32 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/**
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* eCryptfs: Linux filesystem encryption layer
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*
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* Copyright (C) 1997-2004 Erez Zadok
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* Copyright (C) 2001-2004 Stony Brook University
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* Copyright (C) 2004-2007 International Business Machines Corp.
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* Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
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* Michael C. Thompsion <mcthomps@us.ibm.com>
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*/
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#include <linux/file.h>
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#include <linux/vmalloc.h>
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#include <linux/pagemap.h>
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#include <linux/dcache.h>
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#include <linux/namei.h>
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#include <linux/mount.h>
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#include <linux/fs_stack.h>
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#include <linux/slab.h>
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#include <linux/xattr.h>
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#include <asm/unaligned.h>
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#include "ecryptfs_kernel.h"
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static struct dentry *lock_parent(struct dentry *dentry)
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{
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struct dentry *dir;
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dir = dget_parent(dentry);
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inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
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return dir;
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}
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static void unlock_dir(struct dentry *dir)
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{
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inode_unlock(d_inode(dir));
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dput(dir);
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}
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static int ecryptfs_inode_test(struct inode *inode, void *lower_inode)
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{
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return ecryptfs_inode_to_lower(inode) == lower_inode;
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}
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static int ecryptfs_inode_set(struct inode *inode, void *opaque)
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{
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struct inode *lower_inode = opaque;
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ecryptfs_set_inode_lower(inode, lower_inode);
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fsstack_copy_attr_all(inode, lower_inode);
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/* i_size will be overwritten for encrypted regular files */
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fsstack_copy_inode_size(inode, lower_inode);
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inode->i_ino = lower_inode->i_ino;
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inode->i_mapping->a_ops = &ecryptfs_aops;
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if (S_ISLNK(inode->i_mode))
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inode->i_op = &ecryptfs_symlink_iops;
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else if (S_ISDIR(inode->i_mode))
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inode->i_op = &ecryptfs_dir_iops;
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else
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inode->i_op = &ecryptfs_main_iops;
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if (S_ISDIR(inode->i_mode))
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inode->i_fop = &ecryptfs_dir_fops;
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else if (special_file(inode->i_mode))
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init_special_inode(inode, inode->i_mode, inode->i_rdev);
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else
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inode->i_fop = &ecryptfs_main_fops;
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return 0;
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}
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static struct inode *__ecryptfs_get_inode(struct inode *lower_inode,
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struct super_block *sb)
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{
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struct inode *inode;
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if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb))
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return ERR_PTR(-EXDEV);
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if (!igrab(lower_inode))
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return ERR_PTR(-ESTALE);
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inode = iget5_locked(sb, (unsigned long)lower_inode,
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ecryptfs_inode_test, ecryptfs_inode_set,
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lower_inode);
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if (!inode) {
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iput(lower_inode);
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return ERR_PTR(-EACCES);
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}
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if (!(inode->i_state & I_NEW))
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iput(lower_inode);
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return inode;
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}
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struct inode *ecryptfs_get_inode(struct inode *lower_inode,
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struct super_block *sb)
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{
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struct inode *inode = __ecryptfs_get_inode(lower_inode, sb);
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if (!IS_ERR(inode) && (inode->i_state & I_NEW))
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unlock_new_inode(inode);
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return inode;
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}
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/**
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* ecryptfs_interpose
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* @lower_dentry: Existing dentry in the lower filesystem
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* @dentry: ecryptfs' dentry
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* @sb: ecryptfs's super_block
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*
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* Interposes upper and lower dentries.
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*
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* Returns zero on success; non-zero otherwise
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*/
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static int ecryptfs_interpose(struct dentry *lower_dentry,
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struct dentry *dentry, struct super_block *sb)
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{
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struct inode *inode = ecryptfs_get_inode(d_inode(lower_dentry), sb);
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if (IS_ERR(inode))
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return PTR_ERR(inode);
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d_instantiate(dentry, inode);
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return 0;
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}
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static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry,
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struct inode *inode)
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{
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struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
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struct dentry *lower_dir_dentry;
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struct inode *lower_dir_inode;
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int rc;
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lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent);
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lower_dir_inode = d_inode(lower_dir_dentry);
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inode_lock_nested(lower_dir_inode, I_MUTEX_PARENT);
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dget(lower_dentry); // don't even try to make the lower negative
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if (lower_dentry->d_parent != lower_dir_dentry)
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rc = -EINVAL;
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else if (d_unhashed(lower_dentry))
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rc = -EINVAL;
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else
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rc = vfs_unlink(lower_dir_inode, lower_dentry, NULL);
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if (rc) {
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printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
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goto out_unlock;
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}
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fsstack_copy_attr_times(dir, lower_dir_inode);
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set_nlink(inode, ecryptfs_inode_to_lower(inode)->i_nlink);
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inode->i_ctime = dir->i_ctime;
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out_unlock:
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dput(lower_dentry);
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inode_unlock(lower_dir_inode);
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if (!rc)
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d_drop(dentry);
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return rc;
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}
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/**
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* ecryptfs_do_create
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* @directory_inode: inode of the new file's dentry's parent in ecryptfs
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* @ecryptfs_dentry: New file's dentry in ecryptfs
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* @mode: The mode of the new file
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*
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* Creates the underlying file and the eCryptfs inode which will link to
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* it. It will also update the eCryptfs directory inode to mimic the
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* stat of the lower directory inode.
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*
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* Returns the new eCryptfs inode on success; an ERR_PTR on error condition
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*/
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static struct inode *
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ecryptfs_do_create(struct inode *directory_inode,
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struct dentry *ecryptfs_dentry, umode_t mode)
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{
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int rc;
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struct dentry *lower_dentry;
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struct dentry *lower_dir_dentry;
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struct inode *inode;
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lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
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lower_dir_dentry = lock_parent(lower_dentry);
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rc = vfs_create(d_inode(lower_dir_dentry), lower_dentry, mode, true);
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if (rc) {
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printk(KERN_ERR "%s: Failure to create dentry in lower fs; "
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"rc = [%d]\n", __func__, rc);
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inode = ERR_PTR(rc);
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goto out_lock;
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}
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inode = __ecryptfs_get_inode(d_inode(lower_dentry),
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directory_inode->i_sb);
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if (IS_ERR(inode)) {
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vfs_unlink(d_inode(lower_dir_dentry), lower_dentry, NULL);
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goto out_lock;
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}
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fsstack_copy_attr_times(directory_inode, d_inode(lower_dir_dentry));
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fsstack_copy_inode_size(directory_inode, d_inode(lower_dir_dentry));
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out_lock:
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unlock_dir(lower_dir_dentry);
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return inode;
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}
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/**
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* ecryptfs_initialize_file
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*
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* Cause the file to be changed from a basic empty file to an ecryptfs
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* file with a header and first data page.
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*
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* Returns zero on success
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*/
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int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry,
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struct inode *ecryptfs_inode)
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{
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struct ecryptfs_crypt_stat *crypt_stat =
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&ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat;
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int rc = 0;
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if (S_ISDIR(ecryptfs_inode->i_mode)) {
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ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
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crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
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goto out;
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}
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ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
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rc = ecryptfs_new_file_context(ecryptfs_inode);
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if (rc) {
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ecryptfs_printk(KERN_ERR, "Error creating new file "
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"context; rc = [%d]\n", rc);
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goto out;
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}
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rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode);
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if (rc) {
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printk(KERN_ERR "%s: Error attempting to initialize "
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"the lower file for the dentry with name "
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"[%pd]; rc = [%d]\n", __func__,
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ecryptfs_dentry, rc);
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goto out;
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}
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rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode);
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if (rc)
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printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
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ecryptfs_put_lower_file(ecryptfs_inode);
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out:
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return rc;
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}
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/**
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* ecryptfs_create
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* @dir: The inode of the directory in which to create the file.
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* @dentry: The eCryptfs dentry
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* @mode: The mode of the new file.
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*
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* Creates a new file.
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*
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* Returns zero on success; non-zero on error condition
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*/
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static int
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ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
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umode_t mode, bool excl)
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{
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struct inode *ecryptfs_inode;
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int rc;
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ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry,
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mode);
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if (IS_ERR(ecryptfs_inode)) {
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ecryptfs_printk(KERN_WARNING, "Failed to create file in"
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"lower filesystem\n");
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rc = PTR_ERR(ecryptfs_inode);
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goto out;
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}
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/* At this point, a file exists on "disk"; we need to make sure
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* that this on disk file is prepared to be an ecryptfs file */
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rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode);
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if (rc) {
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ecryptfs_do_unlink(directory_inode, ecryptfs_dentry,
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ecryptfs_inode);
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iget_failed(ecryptfs_inode);
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goto out;
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}
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d_instantiate_new(ecryptfs_dentry, ecryptfs_inode);
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out:
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return rc;
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}
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static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode)
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{
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struct ecryptfs_crypt_stat *crypt_stat;
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int rc;
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rc = ecryptfs_get_lower_file(dentry, inode);
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if (rc) {
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printk(KERN_ERR "%s: Error attempting to initialize "
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"the lower file for the dentry with name "
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"[%pd]; rc = [%d]\n", __func__,
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dentry, rc);
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return rc;
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}
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crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
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/* TODO: lock for crypt_stat comparison */
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if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
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ecryptfs_set_default_sizes(crypt_stat);
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rc = ecryptfs_read_and_validate_header_region(inode);
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ecryptfs_put_lower_file(inode);
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if (rc) {
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rc = ecryptfs_read_and_validate_xattr_region(dentry, inode);
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if (!rc)
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crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
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}
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/* Must return 0 to allow non-eCryptfs files to be looked up, too */
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return 0;
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}
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/**
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* ecryptfs_lookup_interpose - Dentry interposition for a lookup
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*/
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static struct dentry *ecryptfs_lookup_interpose(struct dentry *dentry,
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struct dentry *lower_dentry)
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{
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struct path *path = ecryptfs_dentry_to_lower_path(dentry->d_parent);
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struct inode *inode, *lower_inode;
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struct ecryptfs_dentry_info *dentry_info;
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int rc = 0;
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dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL);
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if (!dentry_info) {
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dput(lower_dentry);
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return ERR_PTR(-ENOMEM);
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}
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fsstack_copy_attr_atime(d_inode(dentry->d_parent),
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d_inode(path->dentry));
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BUG_ON(!d_count(lower_dentry));
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ecryptfs_set_dentry_private(dentry, dentry_info);
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dentry_info->lower_path.mnt = mntget(path->mnt);
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dentry_info->lower_path.dentry = lower_dentry;
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/*
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* negative dentry can go positive under us here - its parent is not
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* locked. That's OK and that could happen just as we return from
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* ecryptfs_lookup() anyway. Just need to be careful and fetch
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* ->d_inode only once - it's not stable here.
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*/
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lower_inode = READ_ONCE(lower_dentry->d_inode);
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if (!lower_inode) {
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/* We want to add because we couldn't find in lower */
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d_add(dentry, NULL);
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return NULL;
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}
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inode = __ecryptfs_get_inode(lower_inode, dentry->d_sb);
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if (IS_ERR(inode)) {
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printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n",
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__func__, PTR_ERR(inode));
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return ERR_CAST(inode);
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}
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if (S_ISREG(inode->i_mode)) {
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rc = ecryptfs_i_size_read(dentry, inode);
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if (rc) {
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make_bad_inode(inode);
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return ERR_PTR(rc);
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}
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}
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if (inode->i_state & I_NEW)
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unlock_new_inode(inode);
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return d_splice_alias(inode, dentry);
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}
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/**
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* ecryptfs_lookup
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* @ecryptfs_dir_inode: The eCryptfs directory inode
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* @ecryptfs_dentry: The eCryptfs dentry that we are looking up
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* @flags: lookup flags
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*
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* Find a file on disk. If the file does not exist, then we'll add it to the
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* dentry cache and continue on to read it from the disk.
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*/
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static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
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struct dentry *ecryptfs_dentry,
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unsigned int flags)
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{
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char *encrypted_and_encoded_name = NULL;
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struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
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struct dentry *lower_dir_dentry, *lower_dentry;
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const char *name = ecryptfs_dentry->d_name.name;
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size_t len = ecryptfs_dentry->d_name.len;
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struct dentry *res;
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int rc = 0;
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lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
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mount_crypt_stat = &ecryptfs_superblock_to_private(
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ecryptfs_dentry->d_sb)->mount_crypt_stat;
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if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
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rc = ecryptfs_encrypt_and_encode_filename(
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&encrypted_and_encoded_name, &len,
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mount_crypt_stat, name, len);
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if (rc) {
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printk(KERN_ERR "%s: Error attempting to encrypt and encode "
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"filename; rc = [%d]\n", __func__, rc);
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return ERR_PTR(rc);
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}
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name = encrypted_and_encoded_name;
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}
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lower_dentry = lookup_one_len_unlocked(name, lower_dir_dentry, len);
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if (IS_ERR(lower_dentry)) {
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ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
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"[%ld] on lower_dentry = [%s]\n", __func__,
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PTR_ERR(lower_dentry),
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name);
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res = ERR_CAST(lower_dentry);
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} else {
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res = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry);
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}
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kfree(encrypted_and_encoded_name);
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return res;
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}
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static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
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struct dentry *new_dentry)
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{
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struct dentry *lower_old_dentry;
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struct dentry *lower_new_dentry;
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struct dentry *lower_dir_dentry;
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u64 file_size_save;
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int rc;
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file_size_save = i_size_read(d_inode(old_dentry));
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lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
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lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
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dget(lower_old_dentry);
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dget(lower_new_dentry);
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lower_dir_dentry = lock_parent(lower_new_dentry);
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rc = vfs_link(lower_old_dentry, d_inode(lower_dir_dentry),
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lower_new_dentry, NULL);
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if (rc || d_really_is_negative(lower_new_dentry))
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goto out_lock;
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rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb);
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if (rc)
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goto out_lock;
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fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry));
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fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry));
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set_nlink(d_inode(old_dentry),
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ecryptfs_inode_to_lower(d_inode(old_dentry))->i_nlink);
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i_size_write(d_inode(new_dentry), file_size_save);
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out_lock:
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unlock_dir(lower_dir_dentry);
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dput(lower_new_dentry);
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dput(lower_old_dentry);
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return rc;
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}
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|
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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,
|
|
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;
|
|
struct inode *lower_dir_inode;
|
|
int rc;
|
|
|
|
lower_dentry = ecryptfs_dentry_to_lower(dentry);
|
|
lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent);
|
|
lower_dir_inode = d_inode(lower_dir_dentry);
|
|
|
|
inode_lock_nested(lower_dir_inode, I_MUTEX_PARENT);
|
|
dget(lower_dentry); // don't even try to make the lower negative
|
|
if (lower_dentry->d_parent != lower_dir_dentry)
|
|
rc = -EINVAL;
|
|
else if (d_unhashed(lower_dentry))
|
|
rc = -EINVAL;
|
|
else
|
|
rc = vfs_rmdir(lower_dir_inode, lower_dentry);
|
|
if (!rc) {
|
|
clear_nlink(d_inode(dentry));
|
|
fsstack_copy_attr_times(dir, lower_dir_inode);
|
|
set_nlink(dir, lower_dir_inode->i_nlink);
|
|
}
|
|
dput(lower_dentry);
|
|
inode_unlock(lower_dir_inode);
|
|
if (!rc)
|
|
d_drop(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,
|
|
unsigned int flags)
|
|
{
|
|
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;
|
|
struct inode *target_inode;
|
|
|
|
if (flags)
|
|
return -EINVAL;
|
|
|
|
lower_old_dir_dentry = ecryptfs_dentry_to_lower(old_dentry->d_parent);
|
|
lower_new_dir_dentry = ecryptfs_dentry_to_lower(new_dentry->d_parent);
|
|
|
|
lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
|
|
lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
|
|
|
|
target_inode = d_inode(new_dentry);
|
|
|
|
trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
|
|
dget(lower_new_dentry);
|
|
rc = -EINVAL;
|
|
if (lower_old_dentry->d_parent != lower_old_dir_dentry)
|
|
goto out_lock;
|
|
if (lower_new_dentry->d_parent != lower_new_dir_dentry)
|
|
goto out_lock;
|
|
if (d_unhashed(lower_old_dentry) || d_unhashed(lower_new_dentry))
|
|
goto out_lock;
|
|
/* source should not be ancestor of target */
|
|
if (trap == lower_old_dentry)
|
|
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:
|
|
dput(lower_new_dentry);
|
|
unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
|
|
return rc;
|
|
}
|
|
|
|
static char *ecryptfs_readlink_lower(struct dentry *dentry, size_t *bufsiz)
|
|
{
|
|
DEFINE_DELAYED_CALL(done);
|
|
struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
|
|
const char *link;
|
|
char *buf;
|
|
int rc;
|
|
|
|
link = vfs_get_link(lower_dentry, &done);
|
|
if (IS_ERR(link))
|
|
return ERR_CAST(link);
|
|
|
|
rc = ecryptfs_decode_and_decrypt_filename(&buf, bufsiz, dentry->d_sb,
|
|
link, strlen(link));
|
|
do_delayed_call(&done);
|
|
if (rc)
|
|
return ERR_PTR(rc);
|
|
|
|
return buf;
|
|
}
|
|
|
|
static const char *ecryptfs_get_link(struct dentry *dentry,
|
|
struct inode *inode,
|
|
struct delayed_call *done)
|
|
{
|
|
size_t len;
|
|
char *buf;
|
|
|
|
if (!dentry)
|
|
return ERR_PTR(-ECHILD);
|
|
|
|
buf = ecryptfs_readlink_lower(dentry, &len);
|
|
if (IS_ERR(buf))
|
|
return buf;
|
|
fsstack_copy_attr_atime(d_inode(dentry),
|
|
d_inode(ecryptfs_dentry_to_lower(dentry)));
|
|
buf[len] = '\0';
|
|
set_delayed_call(done, kfree_link, buf);
|
|
return buf;
|
|
}
|
|
|
|
/**
|
|
* 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_MASK) to
|
|
* PAGE_SIZE with zeros. */
|
|
size_t num_zeros = (PAGE_SIZE
|
|
- (ia->ia_size & ~PAGE_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);
|
|
|
|
inode_lock(d_inode(lower_dentry));
|
|
rc = notify_change(lower_dentry, &lower_ia, NULL);
|
|
inode_unlock(d_inode(lower_dentry));
|
|
}
|
|
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)) {
|
|
rc = ecryptfs_init_crypt_stat(crypt_stat);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
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 = setattr_prepare(dentry, 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;
|
|
|
|
inode_lock(d_inode(lower_dentry));
|
|
rc = notify_change(lower_dentry, &lower_ia, NULL);
|
|
inode_unlock(d_inode(lower_dentry));
|
|
out:
|
|
fsstack_copy_attr_all(inode, lower_inode);
|
|
return rc;
|
|
}
|
|
|
|
static int ecryptfs_getattr_link(const struct path *path, struct kstat *stat,
|
|
u32 request_mask, unsigned int flags)
|
|
{
|
|
struct dentry *dentry = path->dentry;
|
|
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(const struct path *path, struct kstat *stat,
|
|
u32 request_mask, unsigned int flags)
|
|
{
|
|
struct dentry *dentry = path->dentry;
|
|
struct kstat lower_stat;
|
|
int rc;
|
|
|
|
rc = vfs_getattr(ecryptfs_dentry_to_lower_path(dentry), &lower_stat,
|
|
request_mask, flags);
|
|
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, struct inode *inode,
|
|
const char *name, const void *value,
|
|
size_t size, int flags)
|
|
{
|
|
int rc;
|
|
struct dentry *lower_dentry;
|
|
|
|
lower_dentry = ecryptfs_dentry_to_lower(dentry);
|
|
if (!(d_inode(lower_dentry)->i_opflags & IOP_XATTR)) {
|
|
rc = -EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
rc = vfs_setxattr(lower_dentry, name, value, size, flags);
|
|
if (!rc && inode)
|
|
fsstack_copy_attr_all(inode, d_inode(lower_dentry));
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
ssize_t
|
|
ecryptfs_getxattr_lower(struct dentry *lower_dentry, struct inode *lower_inode,
|
|
const char *name, void *value, size_t size)
|
|
{
|
|
int rc;
|
|
|
|
if (!(lower_inode->i_opflags & IOP_XATTR)) {
|
|
rc = -EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
inode_lock(lower_inode);
|
|
rc = __vfs_getxattr(lower_dentry, lower_inode, name, value, size);
|
|
inode_unlock(lower_inode);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
static ssize_t
|
|
ecryptfs_getxattr(struct dentry *dentry, struct inode *inode,
|
|
const char *name, void *value, size_t size)
|
|
{
|
|
return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry),
|
|
ecryptfs_inode_to_lower(inode),
|
|
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;
|
|
}
|
|
inode_lock(d_inode(lower_dentry));
|
|
rc = d_inode(lower_dentry)->i_op->listxattr(lower_dentry, list, size);
|
|
inode_unlock(d_inode(lower_dentry));
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
static int ecryptfs_removexattr(struct dentry *dentry, struct inode *inode,
|
|
const char *name)
|
|
{
|
|
int rc;
|
|
struct dentry *lower_dentry;
|
|
struct inode *lower_inode;
|
|
|
|
lower_dentry = ecryptfs_dentry_to_lower(dentry);
|
|
lower_inode = ecryptfs_inode_to_lower(inode);
|
|
if (!(lower_inode->i_opflags & IOP_XATTR)) {
|
|
rc = -EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
inode_lock(lower_inode);
|
|
rc = __vfs_removexattr(lower_dentry, name);
|
|
inode_unlock(lower_inode);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
const struct inode_operations ecryptfs_symlink_iops = {
|
|
.get_link = ecryptfs_get_link,
|
|
.permission = ecryptfs_permission,
|
|
.setattr = ecryptfs_setattr,
|
|
.getattr = ecryptfs_getattr_link,
|
|
.listxattr = ecryptfs_listxattr,
|
|
};
|
|
|
|
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,
|
|
.listxattr = ecryptfs_listxattr,
|
|
};
|
|
|
|
const struct inode_operations ecryptfs_main_iops = {
|
|
.permission = ecryptfs_permission,
|
|
.setattr = ecryptfs_setattr,
|
|
.getattr = ecryptfs_getattr,
|
|
.listxattr = ecryptfs_listxattr,
|
|
};
|
|
|
|
static int ecryptfs_xattr_get(const struct xattr_handler *handler,
|
|
struct dentry *dentry, struct inode *inode,
|
|
const char *name, void *buffer, size_t size)
|
|
{
|
|
return ecryptfs_getxattr(dentry, inode, name, buffer, size);
|
|
}
|
|
|
|
static int ecryptfs_xattr_set(const struct xattr_handler *handler,
|
|
struct dentry *dentry, struct inode *inode,
|
|
const char *name, const void *value, size_t size,
|
|
int flags)
|
|
{
|
|
if (value)
|
|
return ecryptfs_setxattr(dentry, inode, name, value, size, flags);
|
|
else {
|
|
BUG_ON(flags != XATTR_REPLACE);
|
|
return ecryptfs_removexattr(dentry, inode, name);
|
|
}
|
|
}
|
|
|
|
static const struct xattr_handler ecryptfs_xattr_handler = {
|
|
.prefix = "", /* match anything */
|
|
.get = ecryptfs_xattr_get,
|
|
.set = ecryptfs_xattr_set,
|
|
};
|
|
|
|
const struct xattr_handler *ecryptfs_xattr_handlers[] = {
|
|
&ecryptfs_xattr_handler,
|
|
NULL
|
|
};
|