Revert "gh-146121: pkgutil.get_data() reject invalid resource arguments (#146122)"

This reverts commit bcdf231.

Author: encukou

Lib/pkgutil.py

@@ -393,9 +393,6 @@ def get_data(package, resource):
     # signature - an os.path format "filename" starting with the dirname of
     # the package's __file__
     parts = resource.split('/')
-    if os.path.isabs(resource) or '..' in parts:
-        raise ValueError("resource must be a relative path with no "
-                         "parent directory components")
     parts.insert(0, os.path.dirname(mod.__file__))
     resource_name = os.path.join(*parts)
     return loader.get_data(resource_name)

Lib/test/test_pkgutil.py

@@ -61,25 +61,6 @@ def test_getdata_filesys(self):
 
         del sys.modules[pkg]
 
-    def test_getdata_path_traversal(self):
-        pkg = 'test_getdata_traversal'
-
-        # Make a package with some resources
-        package_dir = os.path.join(self.dirname, pkg)
-        os.mkdir(package_dir)
-        # Empty init.py
-        f = open(os.path.join(package_dir, '__init__.py'), "wb")
-        f.close()
-
-        with self.assertRaises(ValueError):
-            pkgutil.get_data(pkg, '../../../etc/passwd')
-        with self.assertRaises(ValueError):
-            pkgutil.get_data(pkg, 'sub/../../../etc/passwd')
-        with self.assertRaises(ValueError):
-            pkgutil.get_data(pkg, os.path.abspath('/etc/passwd'))
-
-        del sys.modules[pkg]
-
     def test_getdata_zipfile(self):
         zip = 'test_getdata_zipfile.zip'
         pkg = 'test_getdata_zipfile'