From ab7c34aa8bfcaee51cb2f1779c18ce96a0f7303c Mon Sep 17 00:00:00 2001
From: VanshAgarwal24036 <vanshagbly6@gmail.com>
Date: Tue, 20 Jan 2026 11:41:26 +0530
Subject: [PATCH 1/4] Fix stat.filemode pure Python file type detection

---
 Lib/stat.py           | 11 ++++++++---
 Lib/test/test_stat.py |  4 ++++
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/Lib/stat.py b/Lib/stat.py
index ab1b25b9d6351c..750e2a8a3f0c3f 100644
--- a/Lib/stat.py
+++ b/Lib/stat.py
@@ -166,9 +166,14 @@ def filemode(mode):
     perm = []
     for index, table in enumerate(_filemode_table):
         for bit, char in table:
-            if mode & bit == bit:
-                perm.append(char)
-                break
+            if index == 0:
+                if (mode & S_IFMT) == bit:
+                    perm.append(char)
+                    break
+            else:
+                if mode & bit == bit:
+                    perm.append(char)
+                    break
         else:
             if index == 0:
                 # Unknown filetype
diff --git a/Lib/test/test_stat.py b/Lib/test/test_stat.py
index 5fd25d5012c425..e5a9826d1f2aca 100644
--- a/Lib/test/test_stat.py
+++ b/Lib/test/test_stat.py
@@ -163,6 +163,10 @@ def test_mode(self):
                              self.statmod.S_IFREG)
             self.assertEqual(self.statmod.S_IMODE(st_mode), 0o666)
 
+    def test_filemode_does_not_misclassify_random_bits(self):
+        # gh-144050 regression test
+        self.assertEqual(self.statmod.filemode(32767)[0], "?")
+
     @os_helper.skip_unless_working_chmod
     def test_directory(self):
         os.mkdir(TESTFN)

From 21de74d06eb4c9fbeaa4d972b723cb1999bedc3e Mon Sep 17 00:00:00 2001
From: VanshAgarwal24036 <vanshagbly6@gmail.com>
Date: Tue, 20 Jan 2026 11:59:42 +0530
Subject: [PATCH 2/4] gh-144050: Fix stat.filemode file type detection in pure
 Python

---
 Lib/stat.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Lib/stat.py b/Lib/stat.py
index 750e2a8a3f0c3f..214c7917b5e048 100644
--- a/Lib/stat.py
+++ b/Lib/stat.py
@@ -167,7 +167,7 @@ def filemode(mode):
     for index, table in enumerate(_filemode_table):
         for bit, char in table:
             if index == 0:
-                if (mode & S_IFMT) == bit:
+                if S_IFMT(mode) == bit:
                     perm.append(char)
                     break
             else:

From e0e74e33f7decfcd3600870a8da64c39a2367a7c Mon Sep 17 00:00:00 2001
From: VanshAgarwal24036 <vanshagbly6@gmail.com>
Date: Tue, 20 Jan 2026 16:37:53 +0530
Subject: [PATCH 3/4] Update test case for higher bit and added news

---
 Lib/test/test_stat.py                                          | 3 ++-
 .../Library/2026-01-20-16-35-55.gh-issue-144050.0kKFbF.rst     | 2 ++
 2 files changed, 4 insertions(+), 1 deletion(-)
 create mode 100644 Misc/NEWS.d/next/Library/2026-01-20-16-35-55.gh-issue-144050.0kKFbF.rst

diff --git a/Lib/test/test_stat.py b/Lib/test/test_stat.py
index e5a9826d1f2aca..a83f7d076f027e 100644
--- a/Lib/test/test_stat.py
+++ b/Lib/test/test_stat.py
@@ -165,7 +165,8 @@ def test_mode(self):
 
     def test_filemode_does_not_misclassify_random_bits(self):
         # gh-144050 regression test
-        self.assertEqual(self.statmod.filemode(32767)[0], "?")
+        self.assertEqual(self.statmod.filemode(0o77777)[0], "?")
+        self.assertEqual(self.statmod.filemode(0o177777)[0], "?")
 
     @os_helper.skip_unless_working_chmod
     def test_directory(self):
diff --git a/Misc/NEWS.d/next/Library/2026-01-20-16-35-55.gh-issue-144050.0kKFbF.rst b/Misc/NEWS.d/next/Library/2026-01-20-16-35-55.gh-issue-144050.0kKFbF.rst
new file mode 100644
index 00000000000000..28a33990149c1d
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2026-01-20-16-35-55.gh-issue-144050.0kKFbF.rst
@@ -0,0 +1,2 @@
+Fix stat.filemode in the pure-Python implementation to avoid misclassifying
+invalid mode values as block devices.

From b560d6e9b7201f45e2fb7b0da0c3f53ea656aa80 Mon Sep 17 00:00:00 2001
From: VanshAgarwal24036 <148854295+VanshAgarwal24036@users.noreply.github.com>
Date: Tue, 20 Jan 2026 17:02:54 +0530
Subject: [PATCH 4/4] Update
 Misc/NEWS.d/next/Library/2026-01-20-16-35-55.gh-issue-144050.0kKFbF.rst

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
---
 .../next/Library/2026-01-20-16-35-55.gh-issue-144050.0kKFbF.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Misc/NEWS.d/next/Library/2026-01-20-16-35-55.gh-issue-144050.0kKFbF.rst b/Misc/NEWS.d/next/Library/2026-01-20-16-35-55.gh-issue-144050.0kKFbF.rst
index 28a33990149c1d..dfc062d023c8f1 100644
--- a/Misc/NEWS.d/next/Library/2026-01-20-16-35-55.gh-issue-144050.0kKFbF.rst
+++ b/Misc/NEWS.d/next/Library/2026-01-20-16-35-55.gh-issue-144050.0kKFbF.rst
@@ -1,2 +1,2 @@
-Fix stat.filemode in the pure-Python implementation to avoid misclassifying
+Fix :func:`stat.filemode` in the pure-Python implementation to avoid misclassifying
 invalid mode values as block devices.