ubifs: Add support for encrypted symlinks
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Richard Weinberger
parent
f4f61d2cc6
commit
ca7f85be8d
@ -629,7 +629,7 @@ static int ubifs_readdir(struct file *file, struct dir_context *ctx)
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fstr.len = fstr_real_len;
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err = fscrypt_fname_disk_to_usr(dir, key_hash_flash(c, &dent->key), 0, &nm.disk_name, &fstr);
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if (err < 0)
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if (err)
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goto out;
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} else {
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fstr.len = fname_len(&nm);
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@ -1164,10 +1164,27 @@ static int ubifs_symlink(struct inode *dir, struct dentry *dentry,
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struct ubifs_inode *dir_ui = ubifs_inode(dir);
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struct ubifs_info *c = dir->i_sb->s_fs_info;
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int err, len = strlen(symname);
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int sz_change = CALC_DENT_SIZE(dentry->d_name.len);
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int sz_change = CALC_DENT_SIZE(len);
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struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1);
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struct fscrypt_symlink_data *sd = NULL;
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struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
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.new_ino_d = ALIGN(len, 8),
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.dirtied_ino = 1 };
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struct fscrypt_name nm;
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if (ubifs_crypt_is_encrypted(dir)) {
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err = fscrypt_get_encryption_info(dir);
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if (err)
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goto out_budg;
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if (!fscrypt_has_encryption_key(dir)) {
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err = -EPERM;
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goto out_budg;
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}
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disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
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sizeof(struct fscrypt_symlink_data));
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}
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/*
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* Budget request settings: new inode, new direntry and changing parent
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@ -1177,36 +1194,77 @@ static int ubifs_symlink(struct inode *dir, struct dentry *dentry,
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dbg_gen("dent '%pd', target '%s' in dir ino %lu", dentry,
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symname, dir->i_ino);
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if (len > UBIFS_MAX_INO_DATA)
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if (disk_link.len > UBIFS_MAX_INO_DATA)
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return -ENAMETOOLONG;
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err = ubifs_budget_space(c, &req);
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if (err)
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return err;
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err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm);
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if (err)
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goto out_budg;
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inode = ubifs_new_inode(c, dir, S_IFLNK | S_IRWXUGO);
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if (IS_ERR(inode)) {
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err = PTR_ERR(inode);
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goto out_budg;
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goto out_fname;
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}
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ui = ubifs_inode(inode);
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ui->data = kmalloc(len + 1, GFP_NOFS);
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ui->data = kmalloc(disk_link.len, GFP_NOFS);
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if (!ui->data) {
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err = -ENOMEM;
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goto out_inode;
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}
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memcpy(ui->data, symname, len);
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((char *)ui->data)[len] = '\0';
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inode->i_link = ui->data;
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if (ubifs_crypt_is_encrypted(dir)) {
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struct qstr istr = QSTR_INIT(symname, len);
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struct fscrypt_str ostr;
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sd = kzalloc(disk_link.len, GFP_NOFS);
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if (!sd) {
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err = -ENOMEM;
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goto out_inode;
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}
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err = fscrypt_get_encryption_info(inode);
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if (err) {
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kfree(sd);
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goto out_inode;
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}
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if (!fscrypt_has_encryption_key(inode)) {
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kfree(sd);
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err = -EPERM;
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goto out_inode;
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}
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ostr.name = sd->encrypted_path;
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ostr.len = disk_link.len;
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err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
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if (err) {
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kfree(sd);
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goto out_inode;
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}
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sd->len = cpu_to_le16(ostr.len);
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disk_link.name = (char *)sd;
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} else {
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inode->i_link = ui->data;
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}
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memcpy(ui->data, disk_link.name, disk_link.len);
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((char *)ui->data)[disk_link.len - 1] = '\0';
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/*
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* The terminating zero byte is not written to the flash media and it
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* is put just to make later in-memory string processing simpler. Thus,
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* data length is @len, not @len + %1.
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*/
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ui->data_len = len;
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inode->i_size = ubifs_inode(inode)->ui_size = len;
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ui->data_len = disk_link.len - 1;
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inode->i_size = ubifs_inode(inode)->ui_size = disk_link.len - 1;
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err = ubifs_init_security(dir, inode, &dentry->d_name);
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if (err)
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@ -1216,7 +1274,7 @@ static int ubifs_symlink(struct inode *dir, struct dentry *dentry,
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dir->i_size += sz_change;
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dir_ui->ui_size = dir->i_size;
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dir->i_mtime = dir->i_ctime = inode->i_ctime;
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err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0);
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err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0);
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if (err)
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goto out_cancel;
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mutex_unlock(&dir_ui->ui_mutex);
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@ -1224,6 +1282,7 @@ static int ubifs_symlink(struct inode *dir, struct dentry *dentry,
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ubifs_release_budget(c, &req);
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insert_inode_hash(inode);
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d_instantiate(dentry, inode);
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fscrypt_free_filename(&nm);
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return 0;
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out_cancel:
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@ -1233,6 +1292,8 @@ out_cancel:
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out_inode:
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make_bad_inode(inode);
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iput(inode);
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out_fname:
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fscrypt_free_filename(&nm);
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out_budg:
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ubifs_release_budget(c, &req);
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return err;
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@ -1657,6 +1657,59 @@ static int ubifs_file_open(struct inode *inode, struct file *filp)
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return 0;
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}
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static const char *ubifs_get_link(struct dentry *dentry,
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struct inode *inode,
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struct delayed_call *done)
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{
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int err;
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struct fscrypt_symlink_data *sd;
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struct ubifs_inode *ui = ubifs_inode(inode);
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struct fscrypt_str cstr;
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struct fscrypt_str pstr;
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if (!ubifs_crypt_is_encrypted(inode))
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return ui->data;
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if (!dentry)
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return ERR_PTR(-ECHILD);
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err = fscrypt_get_encryption_info(inode);
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if (err)
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return ERR_PTR(err);
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sd = (struct fscrypt_symlink_data *)ui->data;
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cstr.name = sd->encrypted_path;
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cstr.len = le16_to_cpu(sd->len);
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if (cstr.len == 0)
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return ERR_PTR(-ENOENT);
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if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > ui->data_len)
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return ERR_PTR(-EIO);
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err = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr);
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if (err)
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return ERR_PTR(err);
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err = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
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if (err) {
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fscrypt_fname_free_buffer(&pstr);
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return ERR_PTR(err);
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}
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pstr.name[pstr.len] = '\0';
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// XXX this probably won't happen anymore...
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if (pstr.name[0] == '\0') {
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fscrypt_fname_free_buffer(&pstr);
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return ERR_PTR(-ENOENT);
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}
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set_delayed_call(done, kfree_link, pstr.name);
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return pstr.name;
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}
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const struct address_space_operations ubifs_file_address_operations = {
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.readpage = ubifs_readpage,
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.writepage = ubifs_writepage,
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@ -1681,7 +1734,7 @@ const struct inode_operations ubifs_file_inode_operations = {
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const struct inode_operations ubifs_symlink_inode_operations = {
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.readlink = generic_readlink,
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.get_link = simple_get_link,
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.get_link = ubifs_get_link,
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.setattr = ubifs_setattr,
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.getattr = ubifs_getattr,
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.listxattr = ubifs_listxattr,
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@ -198,7 +198,6 @@ struct inode *ubifs_iget(struct super_block *sb, unsigned long inum)
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}
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memcpy(ui->data, ino->data, ui->data_len);
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((char *)ui->data)[ui->data_len] = '\0';
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inode->i_link = ui->data;
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break;
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case S_IFBLK:
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case S_IFCHR:
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