PCDrv: Allow opening by absolute path

src/core/pcdrv.cpp

@@ -79,17 +79,18 @@ static bool CloseFileHandle(u32 handle)
 
 static std::string ResolveHostPath(const std::string& path)
 {
-  // Double-check that it falls within the directory of the elf.
+  // Double-check that it falls within the directory of the root.
   // Not a real sandbox, but emulators shouldn't be treated as such. Don't run untrusted code!
   const std::string& root = g_settings.pcdrv_root;
-  std::string canonicalized_path = Path::Canonicalize(Path::Combine(root, path));
+  std::string canonicalized_path =
+    Path::IsAbsolute(path) ? Path::Canonicalize(path) : Path::Canonicalize(Path::Combine(root, path));
   if (canonicalized_path.length() < root.length() ||                      // Length has to be longer (a file),
       !canonicalized_path.starts_with(root) ||                            // and start with the host root,
       canonicalized_path[root.length()] != FS_OSPATH_SEPARATOR_CHARACTER) // and we can't access a sibling.
   {
     ERROR_LOG("Denying access to path outside of PCDrv directory. Requested path: '{}', "
               "Resolved path: '{}', Root directory: '{}'",
-              path, root, canonicalized_path);
+              path, canonicalized_path, root);
     canonicalized_path.clear();
   }