diff --git a/Lib/test/test_os.py b/Lib/test/test_os.py
index c1aaf4fc5..0b95d2b49 100644
--- a/Lib/test/test_os.py
+++ b/Lib/test/test_os.py
@@ -159,8 +159,6 @@ class FileTests(unittest.TestCase):
         os.close(f)
         self.assertTrue(os.access(support.TESTFN, os.W_OK))
 
-    # TODO: RUSTPYTHON (AttributeError: module 'os' has no attribute 'dup')
-    @unittest.expectedFailure
     def test_closerange(self):
         first = os.open(support.TESTFN, os.O_CREAT|os.O_RDWR)
         # We must allocate two consecutive file descriptors, otherwise
@@ -1625,8 +1623,6 @@ class URandomFDTests(unittest.TestCase):
             """
         assert_python_ok('-c', code)
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
     def test_urandom_fd_closed(self):
         # Issue #21207: urandom() should reopen its fd to /dev/urandom if
         # closed.
@@ -1641,8 +1637,6 @@ class URandomFDTests(unittest.TestCase):
             """
         rc, out, err = assert_python_ok('-Sc', code)
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
     def test_urandom_fd_reopened(self):
         # Issue #21207: urandom() should detect its fd to /dev/urandom
         # changed to something else, and reopen it.
diff --git a/vm/src/stdlib/os.rs b/vm/src/stdlib/os.rs
index 6e1c9d685..a8626ab05 100644
--- a/vm/src/stdlib/os.rs
+++ b/vm/src/stdlib/os.rs
@@ -332,6 +332,13 @@ mod _os {
         rust_file(fileno);
     }
 
+    #[pyfunction]
+    fn closerange(fd_low: i64, fd_high: i64) {
+        for fileno in fd_low..fd_high {
+            close(fileno);
+        }
+    }
+
     #[cfg(any(unix, windows, target_os = "wasi"))]
     #[pyfunction]
     pub(crate) fn open(