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Refactor support for encrypted symlinks to move common code to fscrypt.

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Merge tag 'fscrypt_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/fscrypt

Pull fscrypt updates from Ted Ts'o:
 "Refactor support for encrypted symlinks to move common code to fscrypt"

Ted also points out about the merge:
 "This makes the f2fs symlink code use the fscrypt_encrypt_symlink()
  from the fscrypt tree. This will end up dropping the kzalloc() ->
  f2fs_kzalloc() change, which means the fscrypt-specific allocation
  won't get tested by f2fs's kmalloc error injection system; which is
  fine"

* tag 'fscrypt_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/fscrypt: (26 commits)
  fscrypt: fix build with pre-4.6 gcc versions
  fscrypt: remove 'ci' parameter from fscrypt_put_encryption_info()
  fscrypt: document symlink length restriction
  fscrypt: fix up fscrypt_fname_encrypted_size() for internal use
  fscrypt: define fscrypt_fname_alloc_buffer() to be for presented names
  fscrypt: calculate NUL-padding length in one place only
  fscrypt: move fscrypt_symlink_data to fscrypt_private.h
  fscrypt: remove fscrypt_fname_usr_to_disk()
  ubifs: switch to fscrypt_get_symlink()
  ubifs: switch to fscrypt ->symlink() helper functions
  ubifs: free the encrypted symlink target
  f2fs: switch to fscrypt_get_symlink()
  f2fs: switch to fscrypt ->symlink() helper functions
  ext4: switch to fscrypt_get_symlink()
  ext4: switch to fscrypt ->symlink() helper functions
  fscrypt: new helper function - fscrypt_get_symlink()
  fscrypt: new helper functions for ->symlink()
  fscrypt: trim down fscrypt.h includes
  fscrypt: move fscrypt_is_dot_dotdot() to fs/crypto/fname.c
  fscrypt: move fscrypt_valid_enc_modes() to fscrypt_private.h
  ...
This commit is contained in:
Linus Torvalds 2018-02-04 10:43:12 -08:00
commit 3462ac5703
17 changed files with 500 additions and 500 deletions
Download patch file Download diff file Expand all files Collapse all files

63
fs/ubifs/dir.c
View file

@ -1138,38 +1138,24 @@ static int ubifs_symlink(struct inode *dir, struct dentry *dentry,
struct ubifs_info *c = dir->i_sb->s_fs_info;
int err, len = strlen(symname);
int sz_change = CALC_DENT_SIZE(len);
struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1);
struct fscrypt_symlink_data *sd = NULL;
struct fscrypt_str disk_link;
struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
.new_ino_d = ALIGN(len, 8),
.dirtied_ino = 1 };
struct fscrypt_name nm;
if (ubifs_crypt_is_encrypted(dir)) {
err = fscrypt_get_encryption_info(dir);
if (err)
goto out_budg;
dbg_gen("dent '%pd', target '%s' in dir ino %lu", dentry,
symname, dir->i_ino);
if (!fscrypt_has_encryption_key(dir)) {
err = -EPERM;
goto out_budg;
}
disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
sizeof(struct fscrypt_symlink_data));
}
err = fscrypt_prepare_symlink(dir, symname, len, UBIFS_MAX_INO_DATA,
&disk_link);
if (err)
return err;
/*
* Budget request settings: new inode, new direntry and changing parent
* directory inode.
*/
dbg_gen("dent '%pd', target '%s' in dir ino %lu", dentry,
symname, dir->i_ino);
if (disk_link.len > UBIFS_MAX_INO_DATA)
return -ENAMETOOLONG;
err = ubifs_budget_space(c, &req);
if (err)
return err;
@ -1191,38 +1177,20 @@ static int ubifs_symlink(struct inode *dir, struct dentry *dentry,
goto out_inode;
}
if (ubifs_crypt_is_encrypted(dir)) {
struct qstr istr = QSTR_INIT(symname, len);
struct fscrypt_str ostr;
sd = kzalloc(disk_link.len, GFP_NOFS);
if (!sd) {
err = -ENOMEM;
if (IS_ENCRYPTED(inode)) {
disk_link.name = ui->data; /* encrypt directly into ui->data */
err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
if (err)
goto out_inode;
}
ostr.name = sd->encrypted_path;
ostr.len = disk_link.len;
err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
if (err) {
kfree(sd);
goto out_inode;
}
sd->len = cpu_to_le16(ostr.len);
disk_link.name = (char *)sd;
} else {
memcpy(ui->data, disk_link.name, disk_link.len);
inode->i_link = ui->data;
}
memcpy(ui->data, disk_link.name, disk_link.len);
((char *)ui->data)[disk_link.len - 1] = '\0';
/*
* The terminating zero byte is not written to the flash media and it
* is put just to make later in-memory string processing simpler. Thus,
* data length is @len, not @len + %1.
* data length is @disk_link.len - 1, not @disk_link.len.
*/
ui->data_len = disk_link.len - 1;
inode->i_size = ubifs_inode(inode)->ui_size = disk_link.len - 1;
@ -1240,11 +1208,10 @@ static int ubifs_symlink(struct inode *dir, struct dentry *dentry,
goto out_cancel;
mutex_unlock(&dir_ui->ui_mutex);
ubifs_release_budget(c, &req);
insert_inode_hash(inode);
d_instantiate(dentry, inode);
fscrypt_free_filename(&nm);
return 0;
err = 0;
goto out_fname;
out_cancel:
dir->i_size -= sz_change;

36
fs/ubifs/file.c
View file

@ -1629,49 +1629,17 @@ static const char *ubifs_get_link(struct dentry *dentry,
struct inode *inode,
struct delayed_call *done)
{
int err;
struct fscrypt_symlink_data *sd;
struct ubifs_inode *ui = ubifs_inode(inode);
struct fscrypt_str cstr;
struct fscrypt_str pstr;
if (!ubifs_crypt_is_encrypted(inode))
if (!IS_ENCRYPTED(inode))
return ui->data;
if (!dentry)
return ERR_PTR(-ECHILD);
err = fscrypt_get_encryption_info(inode);
if (err)
return ERR_PTR(err);
sd = (struct fscrypt_symlink_data *)ui->data;
cstr.name = sd->encrypted_path;
cstr.len = le16_to_cpu(sd->len);
if (cstr.len == 0)
return ERR_PTR(-ENOENT);
if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > ui->data_len)
return ERR_PTR(-EIO);
err = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr);
if (err)
return ERR_PTR(err);
err = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
if (err) {
fscrypt_fname_free_buffer(&pstr);
return ERR_PTR(err);
}
pstr.name[pstr.len] = '\0';
set_delayed_call(done, kfree_link, pstr.name);
return pstr.name;
return fscrypt_get_symlink(inode, ui->data, ui->data_len, done);
}
const struct address_space_operations ubifs_file_address_operations = {
.readpage = ubifs_readpage,
.writepage = ubifs_writepage,

4
fs/ubifs/super.c
View file

@ -379,9 +379,7 @@ out:
}
done:
clear_inode(inode);
#ifdef CONFIG_UBIFS_FS_ENCRYPTION
fscrypt_put_encryption_info(inode, NULL);
#endif
fscrypt_put_encryption_info(inode);
}
static void ubifs_dirty_inode(struct inode *inode, int flags)