[PATCH 11/24] ubifs: Enforce crypto policy in mmap

[Richard Weinberger]

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

Signed-off-by: Richard Weinberger <rich...@nod.at>
---
 fs/ubifs/file.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c
index a9c5cc6c0bc5..60e789a9cac8 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)
-- 
2.7.3