PermissionDenied issue

Some files cause a permission denied error. Running as `root` does not seem to help. Diagnose what's going wrong here.

Example output:
```
[+] Scanned file: /bin/... 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Os { code: 13, kind: PermissionDenied, message: "Permission denied" }', src/utils.rs:104:45
```