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| author | Richard Weinberger <richard@nod.at> | 2016-09-29 18:00:57 +0200 |
|---|---|---|
| committer | Richard Weinberger <richard@nod.at> | 2016-12-12 23:07:38 +0100 |
| commit | a79bff21c120a615dc8ba6df9258e9e2ef022e3b (patch) | |
| tree | 4769beaf2e5d9f8313602ce5fab4f6a2ccb3ed43 /fs/ubifs | |
| parent | ba40e6a3c40514f6cd50df50033107c1c6794c20 (diff) | |
| download | linux-a79bff21c120a615dc8ba6df9258e9e2ef022e3b.tar.gz | |
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>
Diffstat (limited to 'fs/ubifs')
| -rw-r--r-- | fs/ubifs/file.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c index b4fbeefba246..a9c5cc6c0bc5 100644 --- a/fs/ubifs/file.c +++ b/fs/ubifs/file.c @@ -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 |