^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * eCryptfs: Linux filesystem encryption layer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 1997-2004 Erez Zadok
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (C) 2001-2004 Stony Brook University
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright (C) 2004-2007 International Business Machines Corp.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Michael C. Thompsion <mcthomps@us.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/vmalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/dcache.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/namei.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/mount.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/fs_stack.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/xattr.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <asm/unaligned.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include "ecryptfs_kernel.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) static struct dentry *lock_parent(struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) struct dentry *dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) dir = dget_parent(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) return dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) static void unlock_dir(struct dentry *dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) inode_unlock(d_inode(dir));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) dput(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) static int ecryptfs_inode_test(struct inode *inode, void *lower_inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) return ecryptfs_inode_to_lower(inode) == lower_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) static int ecryptfs_inode_set(struct inode *inode, void *opaque)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) struct inode *lower_inode = opaque;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) ecryptfs_set_inode_lower(inode, lower_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) fsstack_copy_attr_all(inode, lower_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) /* i_size will be overwritten for encrypted regular files */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) fsstack_copy_inode_size(inode, lower_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) inode->i_ino = lower_inode->i_ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) inode->i_mapping->a_ops = &ecryptfs_aops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) if (S_ISLNK(inode->i_mode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) inode->i_op = &ecryptfs_symlink_iops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) else if (S_ISDIR(inode->i_mode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) inode->i_op = &ecryptfs_dir_iops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) inode->i_op = &ecryptfs_main_iops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) if (S_ISDIR(inode->i_mode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) inode->i_fop = &ecryptfs_dir_fops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) else if (special_file(inode->i_mode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) init_special_inode(inode, inode->i_mode, inode->i_rdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) inode->i_fop = &ecryptfs_main_fops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) static struct inode *__ecryptfs_get_inode(struct inode *lower_inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) return ERR_PTR(-EXDEV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) if (!igrab(lower_inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) return ERR_PTR(-ESTALE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) inode = iget5_locked(sb, (unsigned long)lower_inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) ecryptfs_inode_test, ecryptfs_inode_set,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) lower_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) if (!inode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) iput(lower_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) return ERR_PTR(-EACCES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) if (!(inode->i_state & I_NEW))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) iput(lower_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) return inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) struct inode *ecryptfs_get_inode(struct inode *lower_inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) struct inode *inode = __ecryptfs_get_inode(lower_inode, sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) if (!IS_ERR(inode) && (inode->i_state & I_NEW))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) unlock_new_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) return inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) * ecryptfs_interpose
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) * @lower_dentry: Existing dentry in the lower filesystem
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) * @dentry: ecryptfs' dentry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) * @sb: ecryptfs's super_block
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) * Interposes upper and lower dentries.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) * Returns zero on success; non-zero otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) static int ecryptfs_interpose(struct dentry *lower_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) struct dentry *dentry, struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) struct inode *inode = ecryptfs_get_inode(d_inode(lower_dentry), sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) if (IS_ERR(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) return PTR_ERR(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) d_instantiate(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) struct dentry *lower_dir_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) struct inode *lower_dir_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) lower_dir_inode = d_inode(lower_dir_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) inode_lock_nested(lower_dir_inode, I_MUTEX_PARENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) dget(lower_dentry); // don't even try to make the lower negative
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) if (lower_dentry->d_parent != lower_dir_dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) rc = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) else if (d_unhashed(lower_dentry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) rc = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) rc = vfs_unlink(lower_dir_inode, lower_dentry, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) fsstack_copy_attr_times(dir, lower_dir_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) set_nlink(inode, ecryptfs_inode_to_lower(inode)->i_nlink);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) inode->i_ctime = dir->i_ctime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) out_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) dput(lower_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) inode_unlock(lower_dir_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) if (!rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) d_drop(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) * ecryptfs_do_create
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) * @directory_inode: inode of the new file's dentry's parent in ecryptfs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) * @ecryptfs_dentry: New file's dentry in ecryptfs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) * @mode: The mode of the new file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) * Creates the underlying file and the eCryptfs inode which will link to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) * it. It will also update the eCryptfs directory inode to mimic the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) * stat of the lower directory inode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) * Returns the new eCryptfs inode on success; an ERR_PTR on error condition
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) static struct inode *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) ecryptfs_do_create(struct inode *directory_inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) struct dentry *ecryptfs_dentry, umode_t mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) struct dentry *lower_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) struct dentry *lower_dir_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) lower_dir_dentry = lock_parent(lower_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) rc = vfs_create(d_inode(lower_dir_dentry), lower_dentry, mode, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) printk(KERN_ERR "%s: Failure to create dentry in lower fs; "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) "rc = [%d]\n", __func__, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) inode = ERR_PTR(rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) goto out_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) inode = __ecryptfs_get_inode(d_inode(lower_dentry),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) directory_inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) if (IS_ERR(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) vfs_unlink(d_inode(lower_dir_dentry), lower_dentry, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) goto out_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) fsstack_copy_attr_times(directory_inode, d_inode(lower_dir_dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) fsstack_copy_inode_size(directory_inode, d_inode(lower_dir_dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) out_lock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) unlock_dir(lower_dir_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) return inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) * ecryptfs_initialize_file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) * Cause the file to be changed from a basic empty file to an ecryptfs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) * file with a header and first data page.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) * Returns zero on success
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) struct inode *ecryptfs_inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) struct ecryptfs_crypt_stat *crypt_stat =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) int rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) if (S_ISDIR(ecryptfs_inode->i_mode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) rc = ecryptfs_new_file_context(ecryptfs_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) ecryptfs_printk(KERN_ERR, "Error creating new file "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) "context; rc = [%d]\n", rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) printk(KERN_ERR "%s: Error attempting to initialize "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) "the lower file for the dentry with name "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) "[%pd]; rc = [%d]\n", __func__,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) ecryptfs_dentry, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) ecryptfs_put_lower_file(ecryptfs_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) * ecryptfs_create
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) * @dir: The inode of the directory in which to create the file.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) * @dentry: The eCryptfs dentry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) * @mode: The mode of the new file.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) * Creates a new file.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) * Returns zero on success; non-zero on error condition
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) umode_t mode, bool excl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) struct inode *ecryptfs_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) if (IS_ERR(ecryptfs_inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) ecryptfs_printk(KERN_WARNING, "Failed to create file in"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) "lower filesystem\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) rc = PTR_ERR(ecryptfs_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) /* At this point, a file exists on "disk"; we need to make sure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) * that this on disk file is prepared to be an ecryptfs file */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) ecryptfs_do_unlink(directory_inode, ecryptfs_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) ecryptfs_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) iget_failed(ecryptfs_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) d_instantiate_new(ecryptfs_dentry, ecryptfs_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) struct ecryptfs_crypt_stat *crypt_stat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) rc = ecryptfs_get_lower_file(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) printk(KERN_ERR "%s: Error attempting to initialize "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) "the lower file for the dentry with name "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) "[%pd]; rc = [%d]\n", __func__,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) dentry, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) /* TODO: lock for crypt_stat comparison */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) ecryptfs_set_default_sizes(crypt_stat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) rc = ecryptfs_read_and_validate_header_region(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) ecryptfs_put_lower_file(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) rc = ecryptfs_read_and_validate_xattr_region(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) if (!rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) /* Must return 0 to allow non-eCryptfs files to be looked up, too */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) * ecryptfs_lookup_interpose - Dentry interposition for a lookup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) static struct dentry *ecryptfs_lookup_interpose(struct dentry *dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) struct dentry *lower_dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) struct path *path = ecryptfs_dentry_to_lower_path(dentry->d_parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) struct inode *inode, *lower_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) struct ecryptfs_dentry_info *dentry_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) int rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) if (!dentry_info) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) dput(lower_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) fsstack_copy_attr_atime(d_inode(dentry->d_parent),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) d_inode(path->dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) BUG_ON(!d_count(lower_dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) ecryptfs_set_dentry_private(dentry, dentry_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) dentry_info->lower_path.mnt = mntget(path->mnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) dentry_info->lower_path.dentry = lower_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) * negative dentry can go positive under us here - its parent is not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) * locked. That's OK and that could happen just as we return from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) * ecryptfs_lookup() anyway. Just need to be careful and fetch
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) * ->d_inode only once - it's not stable here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) lower_inode = READ_ONCE(lower_dentry->d_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) if (!lower_inode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) /* We want to add because we couldn't find in lower */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) d_add(dentry, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) inode = __ecryptfs_get_inode(lower_inode, dentry->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) if (IS_ERR(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) __func__, PTR_ERR(inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) return ERR_CAST(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) if (S_ISREG(inode->i_mode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) rc = ecryptfs_i_size_read(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) make_bad_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) return ERR_PTR(rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) if (inode->i_state & I_NEW)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) unlock_new_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) return d_splice_alias(inode, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) * ecryptfs_lookup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) * @ecryptfs_dir_inode: The eCryptfs directory inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) * @flags: lookup flags
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) * Find a file on disk. If the file does not exist, then we'll add it to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) * dentry cache and continue on to read it from the disk.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) struct dentry *ecryptfs_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) char *encrypted_and_encoded_name = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) struct dentry *lower_dir_dentry, *lower_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) const char *name = ecryptfs_dentry->d_name.name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) size_t len = ecryptfs_dentry->d_name.len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) struct dentry *res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) int rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) mount_crypt_stat = &ecryptfs_superblock_to_private(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) ecryptfs_dentry->d_sb)->mount_crypt_stat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) rc = ecryptfs_encrypt_and_encode_filename(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) &encrypted_and_encoded_name, &len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) mount_crypt_stat, name, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) printk(KERN_ERR "%s: Error attempting to encrypt and encode "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) "filename; rc = [%d]\n", __func__, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) return ERR_PTR(rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) name = encrypted_and_encoded_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) lower_dentry = lookup_one_len_unlocked(name, lower_dir_dentry, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) if (IS_ERR(lower_dentry)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) "[%ld] on lower_dentry = [%s]\n", __func__,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) PTR_ERR(lower_dentry),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) res = ERR_CAST(lower_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) res = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) kfree(encrypted_and_encoded_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) struct dentry *new_dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) struct dentry *lower_old_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) struct dentry *lower_new_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) struct dentry *lower_dir_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) u64 file_size_save;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) file_size_save = i_size_read(d_inode(old_dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) dget(lower_old_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) dget(lower_new_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) lower_dir_dentry = lock_parent(lower_new_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) rc = vfs_link(lower_old_dentry, d_inode(lower_dir_dentry),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) lower_new_dentry, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) if (rc || d_really_is_negative(lower_new_dentry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) goto out_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) goto out_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) set_nlink(d_inode(old_dentry),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) ecryptfs_inode_to_lower(d_inode(old_dentry))->i_nlink);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) i_size_write(d_inode(new_dentry), file_size_save);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) out_lock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) unlock_dir(lower_dir_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) dput(lower_new_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) dput(lower_old_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) return ecryptfs_do_unlink(dir, dentry, d_inode(dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) const char *symname)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) struct dentry *lower_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) struct dentry *lower_dir_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) char *encoded_symname;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) size_t encoded_symlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) lower_dentry = ecryptfs_dentry_to_lower(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) dget(lower_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) lower_dir_dentry = lock_parent(lower_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) mount_crypt_stat = &ecryptfs_superblock_to_private(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) dir->i_sb)->mount_crypt_stat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) &encoded_symlen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) mount_crypt_stat, symname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) strlen(symname));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) goto out_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) rc = vfs_symlink(d_inode(lower_dir_dentry), lower_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) encoded_symname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) kfree(encoded_symname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) if (rc || d_really_is_negative(lower_dentry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) goto out_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) goto out_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) out_lock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) unlock_dir(lower_dir_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) dput(lower_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) if (d_really_is_negative(dentry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) d_drop(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) struct dentry *lower_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) struct dentry *lower_dir_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) lower_dentry = ecryptfs_dentry_to_lower(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) lower_dir_dentry = lock_parent(lower_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) rc = vfs_mkdir(d_inode(lower_dir_dentry), lower_dentry, mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) if (rc || d_really_is_negative(lower_dentry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) unlock_dir(lower_dir_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) if (d_really_is_negative(dentry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) d_drop(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) struct dentry *lower_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) struct dentry *lower_dir_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) struct inode *lower_dir_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) lower_dentry = ecryptfs_dentry_to_lower(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) lower_dir_inode = d_inode(lower_dir_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) inode_lock_nested(lower_dir_inode, I_MUTEX_PARENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) dget(lower_dentry); // don't even try to make the lower negative
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) if (lower_dentry->d_parent != lower_dir_dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) rc = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) else if (d_unhashed(lower_dentry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) rc = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) rc = vfs_rmdir(lower_dir_inode, lower_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) if (!rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) clear_nlink(d_inode(dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) fsstack_copy_attr_times(dir, lower_dir_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) set_nlink(dir, lower_dir_inode->i_nlink);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) dput(lower_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) inode_unlock(lower_dir_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) if (!rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) d_drop(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) struct dentry *lower_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) struct dentry *lower_dir_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) lower_dentry = ecryptfs_dentry_to_lower(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) lower_dir_dentry = lock_parent(lower_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) rc = vfs_mknod(d_inode(lower_dir_dentry), lower_dentry, mode, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) if (rc || d_really_is_negative(lower_dentry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) unlock_dir(lower_dir_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) if (d_really_is_negative(dentry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) d_drop(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) struct inode *new_dir, struct dentry *new_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) struct dentry *lower_old_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) struct dentry *lower_new_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) struct dentry *lower_old_dir_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) struct dentry *lower_new_dir_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) struct dentry *trap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) struct inode *target_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) if (flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) lower_old_dir_dentry = ecryptfs_dentry_to_lower(old_dentry->d_parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) lower_new_dir_dentry = ecryptfs_dentry_to_lower(new_dentry->d_parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) target_inode = d_inode(new_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) dget(lower_new_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) rc = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) if (lower_old_dentry->d_parent != lower_old_dir_dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) goto out_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) if (lower_new_dentry->d_parent != lower_new_dir_dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) goto out_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) if (d_unhashed(lower_old_dentry) || d_unhashed(lower_new_dentry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) goto out_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) /* source should not be ancestor of target */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) if (trap == lower_old_dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) goto out_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) /* target should not be ancestor of source */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) if (trap == lower_new_dentry) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) rc = -ENOTEMPTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) goto out_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) rc = vfs_rename(d_inode(lower_old_dir_dentry), lower_old_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) d_inode(lower_new_dir_dentry), lower_new_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) NULL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) goto out_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) if (target_inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) fsstack_copy_attr_all(target_inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) ecryptfs_inode_to_lower(target_inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) fsstack_copy_attr_all(new_dir, d_inode(lower_new_dir_dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) if (new_dir != old_dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) fsstack_copy_attr_all(old_dir, d_inode(lower_old_dir_dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) out_lock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) dput(lower_new_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) static char *ecryptfs_readlink_lower(struct dentry *dentry, size_t *bufsiz)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) DEFINE_DELAYED_CALL(done);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) const char *link;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) char *buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) link = vfs_get_link(lower_dentry, &done);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) if (IS_ERR(link))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) return ERR_CAST(link);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) rc = ecryptfs_decode_and_decrypt_filename(&buf, bufsiz, dentry->d_sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) link, strlen(link));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) do_delayed_call(&done);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) return ERR_PTR(rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) return buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) static const char *ecryptfs_get_link(struct dentry *dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) struct delayed_call *done)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) size_t len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) char *buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) if (!dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) return ERR_PTR(-ECHILD);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) buf = ecryptfs_readlink_lower(dentry, &len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) if (IS_ERR(buf))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) return buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) fsstack_copy_attr_atime(d_inode(dentry),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) d_inode(ecryptfs_dentry_to_lower(dentry)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) buf[len] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) set_delayed_call(done, kfree_link, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) return buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) * upper_size_to_lower_size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) * @crypt_stat: Crypt_stat associated with file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) * @upper_size: Size of the upper file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) * Calculate the required size of the lower file based on the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) * specified size of the upper file. This calculation is based on the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) * number of headers in the underlying file and the extent size.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) * Returns Calculated size of the lower file.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) static loff_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) loff_t upper_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) loff_t lower_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) lower_size = ecryptfs_lower_header_size(crypt_stat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) if (upper_size != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) loff_t num_extents;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) num_extents = upper_size >> crypt_stat->extent_shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) if (upper_size & ~crypt_stat->extent_mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) num_extents++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) lower_size += (num_extents * crypt_stat->extent_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) return lower_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) * truncate_upper
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) * @dentry: The ecryptfs layer dentry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) * @ia: Address of the ecryptfs inode's attributes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) * @lower_ia: Address of the lower inode's attributes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) * Function to handle truncations modifying the size of the file. Note
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) * that the file sizes are interpolated. When expanding, we are simply
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) * writing strings of 0's out. When truncating, we truncate the upper
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) * inode and update the lower_ia according to the page index
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) * the caller must use lower_ia in a call to notify_change() to perform
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) * the truncation of the lower inode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) * Returns zero on success; non-zero otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) static int truncate_upper(struct dentry *dentry, struct iattr *ia,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) struct iattr *lower_ia)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) int rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) struct inode *inode = d_inode(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) struct ecryptfs_crypt_stat *crypt_stat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) loff_t i_size = i_size_read(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) loff_t lower_size_before_truncate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) loff_t lower_size_after_truncate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) if (unlikely((ia->ia_size == i_size))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) lower_ia->ia_valid &= ~ATTR_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) rc = ecryptfs_get_lower_file(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) /* Switch on growing or shrinking file */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) if (ia->ia_size > i_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) char zero[] = { 0x00 };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) lower_ia->ia_valid &= ~ATTR_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) /* Write a single 0 at the last position of the file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) * this triggers code that will fill in 0's throughout
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) * the intermediate portion of the previous end of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) * file and the new and of the file */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) rc = ecryptfs_write(inode, zero,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) (ia->ia_size - 1), 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) } else { /* ia->ia_size < i_size_read(inode) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) /* We're chopping off all the pages down to the page
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) * in which ia->ia_size is located. Fill in the end of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) * that page from (ia->ia_size & ~PAGE_MASK) to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) * PAGE_SIZE with zeros. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) size_t num_zeros = (PAGE_SIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) - (ia->ia_size & ~PAGE_MASK));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) truncate_setsize(inode, ia->ia_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) lower_ia->ia_size = ia->ia_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) lower_ia->ia_valid |= ATTR_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) if (num_zeros) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) char *zeros_virt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) if (!zeros_virt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) rc = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) rc = ecryptfs_write(inode, zeros_virt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) ia->ia_size, num_zeros);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) kfree(zeros_virt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) printk(KERN_ERR "Error attempting to zero out "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) "the remainder of the end page on "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) "reducing truncate; rc = [%d]\n", rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) truncate_setsize(inode, ia->ia_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) rc = ecryptfs_write_inode_size_to_metadata(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) printk(KERN_ERR "Problem with "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) "ecryptfs_write_inode_size_to_metadata; "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) "rc = [%d]\n", rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) /* We are reducing the size of the ecryptfs file, and need to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) * know if we need to reduce the size of the lower file. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) lower_size_before_truncate =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) upper_size_to_lower_size(crypt_stat, i_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) lower_size_after_truncate =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) upper_size_to_lower_size(crypt_stat, ia->ia_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) if (lower_size_after_truncate < lower_size_before_truncate) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) lower_ia->ia_size = lower_size_after_truncate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) lower_ia->ia_valid |= ATTR_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) lower_ia->ia_valid &= ~ATTR_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) ecryptfs_put_lower_file(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) struct ecryptfs_crypt_stat *crypt_stat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) loff_t lower_oldsize, lower_newsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) lower_oldsize = upper_size_to_lower_size(crypt_stat,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) i_size_read(inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) lower_newsize = upper_size_to_lower_size(crypt_stat, offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) if (lower_newsize > lower_oldsize) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) * The eCryptfs inode and the new *lower* size are mixed here
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) * because we may not have the lower i_mutex held and/or it may
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) * not be appropriate to call inode_newsize_ok() with inodes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) * from other filesystems.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) return inode_newsize_ok(inode, lower_newsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) * ecryptfs_truncate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) * @dentry: The ecryptfs layer dentry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) * @new_length: The length to expand the file to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) * Simple function that handles the truncation of an eCryptfs inode and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) * its corresponding lower inode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) * Returns zero on success; non-zero otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) struct iattr lower_ia = { .ia_valid = 0 };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) rc = ecryptfs_inode_newsize_ok(d_inode(dentry), new_length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) rc = truncate_upper(dentry, &ia, &lower_ia);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) inode_lock(d_inode(lower_dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) rc = notify_change(lower_dentry, &lower_ia, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) inode_unlock(d_inode(lower_dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) ecryptfs_permission(struct inode *inode, int mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) return inode_permission(ecryptfs_inode_to_lower(inode), mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) * ecryptfs_setattr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) * @dentry: dentry handle to the inode to modify
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) * @ia: Structure with flags of what to change and values
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) * Updates the metadata of an inode. If the update is to the size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) * i.e. truncation, then ecryptfs_truncate will handle the size modification
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) * of both the ecryptfs inode and the lower inode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) * All other metadata changes will be passed right to the lower filesystem,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) * and we will just update our inode to look like the lower.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) int rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) struct dentry *lower_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) struct iattr lower_ia;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) struct inode *lower_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) struct ecryptfs_crypt_stat *crypt_stat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) rc = ecryptfs_init_crypt_stat(crypt_stat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) inode = d_inode(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) lower_inode = ecryptfs_inode_to_lower(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) lower_dentry = ecryptfs_dentry_to_lower(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) mutex_lock(&crypt_stat->cs_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) if (d_is_dir(dentry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) else if (d_is_reg(dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) mount_crypt_stat = &ecryptfs_superblock_to_private(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) dentry->d_sb)->mount_crypt_stat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) rc = ecryptfs_get_lower_file(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) mutex_unlock(&crypt_stat->cs_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) rc = ecryptfs_read_metadata(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) ecryptfs_put_lower_file(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) if (!(mount_crypt_stat->flags
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) rc = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) printk(KERN_WARNING "Either the lower file "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) "is not in a valid eCryptfs format, "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) "or the key could not be retrieved. "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) "Plaintext passthrough mode is not "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) "enabled; returning -EIO\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) mutex_unlock(&crypt_stat->cs_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) | ECRYPTFS_ENCRYPTED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) mutex_unlock(&crypt_stat->cs_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) rc = setattr_prepare(dentry, ia);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) if (ia->ia_valid & ATTR_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) memcpy(&lower_ia, ia, sizeof(lower_ia));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) if (ia->ia_valid & ATTR_FILE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) if (ia->ia_valid & ATTR_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) rc = truncate_upper(dentry, ia, &lower_ia);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) if (rc < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) * mode change is for clearing setuid/setgid bits. Allow lower fs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) * to interpret this in its own way.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) lower_ia.ia_valid &= ~ATTR_MODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) inode_lock(d_inode(lower_dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) rc = notify_change(lower_dentry, &lower_ia, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) inode_unlock(d_inode(lower_dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) fsstack_copy_attr_all(inode, lower_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) static int ecryptfs_getattr_link(const struct path *path, struct kstat *stat,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) u32 request_mask, unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972) struct dentry *dentry = path->dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) int rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) mount_crypt_stat = &ecryptfs_superblock_to_private(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) dentry->d_sb)->mount_crypt_stat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) generic_fillattr(d_inode(dentry), stat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979) if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980) char *target;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) size_t targetsiz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983) target = ecryptfs_readlink_lower(dentry, &targetsiz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) if (!IS_ERR(target)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) kfree(target);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) stat->size = targetsiz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) rc = PTR_ERR(target);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994) static int ecryptfs_getattr(const struct path *path, struct kstat *stat,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) u32 request_mask, unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997) struct dentry *dentry = path->dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) struct kstat lower_stat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001) rc = vfs_getattr(ecryptfs_dentry_to_lower_path(dentry), &lower_stat,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002) request_mask, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) if (!rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) fsstack_copy_attr_all(d_inode(dentry),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) ecryptfs_inode_to_lower(d_inode(dentry)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006) generic_fillattr(d_inode(dentry), stat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) stat->blocks = lower_stat.blocks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) ecryptfs_setxattr(struct dentry *dentry, struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) const char *name, const void *value,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) size_t size, int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) struct dentry *lower_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) lower_dentry = ecryptfs_dentry_to_lower(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021) if (!(d_inode(lower_dentry)->i_opflags & IOP_XATTR)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) rc = -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) rc = vfs_setxattr(lower_dentry, name, value, size, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) if (!rc && inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027) fsstack_copy_attr_all(inode, d_inode(lower_dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) ssize_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033) ecryptfs_getxattr_lower(struct dentry *lower_dentry, struct inode *lower_inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) const char *name, void *value, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038) if (!(lower_inode->i_opflags & IOP_XATTR)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) rc = -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042) inode_lock(lower_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043) rc = __vfs_getxattr(lower_dentry, lower_inode, name, value, size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044) XATTR_NOSECURITY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) inode_unlock(lower_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) static ssize_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051) ecryptfs_getxattr(struct dentry *dentry, struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) const char *name, void *value, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054) return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055) ecryptfs_inode_to_lower(inode),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056) name, value, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059) static ssize_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060) ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1062) int rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1063) struct dentry *lower_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1064)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1065) lower_dentry = ecryptfs_dentry_to_lower(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1066) if (!d_inode(lower_dentry)->i_op->listxattr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1067) rc = -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1068) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1069) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1070) inode_lock(d_inode(lower_dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1071) rc = d_inode(lower_dentry)->i_op->listxattr(lower_dentry, list, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1072) inode_unlock(d_inode(lower_dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1073) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1074) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1075) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1076)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1077) static int ecryptfs_removexattr(struct dentry *dentry, struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1078) const char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1079) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1080) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1081) struct dentry *lower_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1082) struct inode *lower_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1083)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1084) lower_dentry = ecryptfs_dentry_to_lower(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1085) lower_inode = ecryptfs_inode_to_lower(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1086) if (!(lower_inode->i_opflags & IOP_XATTR)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1087) rc = -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1088) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1089) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1090) inode_lock(lower_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1091) rc = __vfs_removexattr(lower_dentry, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1092) inode_unlock(lower_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1093) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1094) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1095) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1096)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1097) const struct inode_operations ecryptfs_symlink_iops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1098) .get_link = ecryptfs_get_link,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1099) .permission = ecryptfs_permission,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1100) .setattr = ecryptfs_setattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1101) .getattr = ecryptfs_getattr_link,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1102) .listxattr = ecryptfs_listxattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1103) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1105) const struct inode_operations ecryptfs_dir_iops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1106) .create = ecryptfs_create,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1107) .lookup = ecryptfs_lookup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1108) .link = ecryptfs_link,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1109) .unlink = ecryptfs_unlink,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1110) .symlink = ecryptfs_symlink,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1111) .mkdir = ecryptfs_mkdir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1112) .rmdir = ecryptfs_rmdir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1113) .mknod = ecryptfs_mknod,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1114) .rename = ecryptfs_rename,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1115) .permission = ecryptfs_permission,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1116) .setattr = ecryptfs_setattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1117) .listxattr = ecryptfs_listxattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1118) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1120) const struct inode_operations ecryptfs_main_iops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1121) .permission = ecryptfs_permission,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1122) .setattr = ecryptfs_setattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1123) .getattr = ecryptfs_getattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1124) .listxattr = ecryptfs_listxattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1125) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1127) static int ecryptfs_xattr_get(const struct xattr_handler *handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1128) struct dentry *dentry, struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1129) const char *name, void *buffer, size_t size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1130) int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1131) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1132) return ecryptfs_getxattr(dentry, inode, name, buffer, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1133) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1135) static int ecryptfs_xattr_set(const struct xattr_handler *handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1136) struct dentry *dentry, struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1137) const char *name, const void *value, size_t size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1138) int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1139) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1140) if (value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1141) return ecryptfs_setxattr(dentry, inode, name, value, size, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1142) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1143) BUG_ON(flags != XATTR_REPLACE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1144) return ecryptfs_removexattr(dentry, inode, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1146) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1148) static const struct xattr_handler ecryptfs_xattr_handler = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1149) .prefix = "", /* match anything */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1150) .get = ecryptfs_xattr_get,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1151) .set = ecryptfs_xattr_set,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1152) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1154) const struct xattr_handler *ecryptfs_xattr_handlers[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1155) &ecryptfs_xattr_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1156) NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1157) };
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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