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ubifs: Implement file open operation

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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>
This commit is contained in:
Richard Weinberger 2016-09-29 18:00:57 +02:00
parent ba40e6a3c4
commit a79bff21c1
1 changed files with 30 additions and 0 deletions
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30
fs/ubifs/file.c
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@ -1605,6 +1605,35 @@ static int ubifs_file_mmap(struct file *file, struct vm_area_struct *vma)
return 0;
}
static int ubifs_file_open(struct inode *inode, struct file *filp)
{
int ret;
struct dentry *dir;
struct ubifs_info *c = inode->i_sb->s_fs_info;
if (ubifs_crypt_is_encrypted(inode)) {
ret = fscrypt_get_encryption_info(inode);
if (ret)
return -EACCES;
if (!fscrypt_has_encryption_key(inode))
return -ENOKEY;
}
dir = dget_parent(file_dentry(filp));
if (ubifs_crypt_is_encrypted(d_inode(dir)) &&
!fscrypt_has_permitted_context(d_inode(dir), inode)) {
ubifs_err(c, "Inconsistent encryption contexts: %lu/%lu",
(unsigned long) d_inode(dir)->i_ino,
(unsigned long) inode->i_ino);
dput(dir);
ubifs_ro_mode(c, -EPERM);
return -EPERM;
}
dput(dir);
return 0;
}
const struct address_space_operations ubifs_file_address_operations = {
.readpage = ubifs_readpage,
.writepage = ubifs_writepage,
@ -1647,6 +1676,7 @@ const struct file_operations ubifs_file_operations = {
.unlocked_ioctl = ubifs_ioctl,
.splice_read = generic_file_splice_read,
.splice_write = iter_file_splice_write,
.open = ubifs_file_open,
#ifdef CONFIG_COMPAT
.compat_ioctl = ubifs_compat_ioctl,
#endif