ubifs: Implement file open operation
We need ->open() for files to load the crypto key. If the no key is present and the file is encrypted, refuse to open. Signed-off-by: Richard Weinberger <richard@nod.at>
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ba40e6a3c4
Коммит
a79bff21c1
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@ -1605,6 +1605,35 @@ static int ubifs_file_mmap(struct file *file, struct vm_area_struct *vma)
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return 0;
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}
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static int ubifs_file_open(struct inode *inode, struct file *filp)
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{
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int ret;
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struct dentry *dir;
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struct ubifs_info *c = inode->i_sb->s_fs_info;
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if (ubifs_crypt_is_encrypted(inode)) {
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ret = fscrypt_get_encryption_info(inode);
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if (ret)
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return -EACCES;
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if (!fscrypt_has_encryption_key(inode))
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return -ENOKEY;
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}
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dir = dget_parent(file_dentry(filp));
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if (ubifs_crypt_is_encrypted(d_inode(dir)) &&
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!fscrypt_has_permitted_context(d_inode(dir), inode)) {
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ubifs_err(c, "Inconsistent encryption contexts: %lu/%lu",
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(unsigned long) d_inode(dir)->i_ino,
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(unsigned long) inode->i_ino);
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dput(dir);
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ubifs_ro_mode(c, -EPERM);
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return -EPERM;
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}
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dput(dir);
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return 0;
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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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@ -1647,6 +1676,7 @@ const struct file_operations ubifs_file_operations = {
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.unlocked_ioctl = ubifs_ioctl,
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.splice_read = generic_file_splice_read,
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.splice_write = iter_file_splice_write,
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.open = ubifs_file_open,
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#ifdef CONFIG_COMPAT
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.compat_ioctl = ubifs_compat_ioctl,
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#endif
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