[13/26] ubifs: Enforce crypto policy in mmap

Commit Message

Richard Weinberger Oct. 21, 2016, 12:48 p.m. UTC

We need this extra check in mmap because a process could
gain an already opened fd.

Signed-off-by: Richard Weinberger <[e-mail]>
---
 fs/ubifs/file.c | 9 +++++++++
 1 file changed, 9 insertions(+)

Patch

diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c
index fc79278969e5..bd0049788e24 100644
--- a/fs/ubifs/file.c
+++ b/fs/ubifs/file.c
@@ -1594,6 +1594,15 @@  static const struct vm_operations_struct ubifs_file_vm_ops = {
 static int ubifs_file_mmap(struct file *file, struct vm_area_struct *vma)
 {
 	int err;
+	struct inode *inode = file->f_mapping->host;
+
+	if (ubifs_crypt_is_encrypted(inode)) {
+		err = fscrypt_get_encryption_info(inode);
+		if (err)
+			return -EACCES;
+		if (!fscrypt_has_encryption_key(inode))
+			return -ENOKEY;
+	}
 
 	err = generic_file_mmap(file, vma);
 	if (err)