From 9d3b6b2472f7c7ef841e652825de652bc8af85d7 Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
 <31488909+miss-islington@users.noreply.github.com>
Date: Tue, 24 Aug 2021 08:07:31 -0700
Subject: [PATCH] [3.9] bpo-34990: Treat the pyc header's mtime in compileall
 as an unsigned int (GH-19708)
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(cherry picked from commit bb21e28fd08f894ceff2405544a2f257d42b1354)

Co-authored-by: Ammar Askar <ammar@ammaraskar.com>
Co-authored-by: Stéphane Wirtel <stephane@wirtel.be>

ported to python-2.7 by Bernhard M. Wiedemann <bwiedemann suse de>

diff --git a/Lib/compileall.py b/Lib/compileall.py
index 5cfa8be..193147e 100644
--- a/Lib/compileall.py
+++ b/Lib/compileall.py
@@ -85,7 +85,7 @@ def compile_file(fullname, ddir=None, force=0, rx=None, quiet=0):
             if not force:
                 try:
                     mtime = int(os.stat(fullname).st_mtime)
-                    expect = struct.pack('<4sl', imp.get_magic(), mtime)
+                    expect = struct.pack('<4sL', imp.get_magic(), mtime & 0xFFFFFFFF)
                     cfile = fullname + (__debug__ and 'c' or 'o')
                     with open(cfile, 'rb') as chandle:
                         actual = chandle.read(8)
diff --git a/Lib/test/test_compileall.py b/Lib/test/test_compileall.py
index d3a26db..0907f59 100644
--- a/Lib/test/test_compileall.py
+++ b/Lib/test/test_compileall.py
@@ -28,7 +28,7 @@ class CompileallTests(unittest.TestCase):
         with open(self.bc_path, 'rb') as file:
             data = file.read(8)
         mtime = int(os.stat(self.source_path).st_mtime)
-        compare = struct.pack('<4sl', imp.get_magic(), mtime)
+        compare = struct.pack('<4sL', imp.get_magic(), mtime & 0xFFFFFFFF)
         return data, compare
 
     @unittest.skipUnless(hasattr(os, 'stat'), 'test needs os.stat()')
@@ -48,7 +48,7 @@ class CompileallTests(unittest.TestCase):
 
     def test_mtime(self):
         # Test a change in mtime leads to a new .pyc.
-        self.recreation_check(struct.pack('<4sl', imp.get_magic(), 1))
+        self.recreation_check(struct.pack('<4sL', imp.get_magic(), 1))
 
     def test_magic_number(self):
         # Test a change in mtime leads to a new .pyc.
diff --git a/Lib/test/test_zipimport.py b/Lib/test/test_zipimport.py
index a66738a..e333582 100644
--- a/Lib/test/test_zipimport.py
+++ b/Lib/test/test_zipimport.py
@@ -27,13 +27,7 @@ raise_src = 'def do_raise(): raise TypeError\n'
 
 def make_pyc(co, mtime):
     data = marshal.dumps(co)
-    if type(mtime) is type(0.0):
-        # Mac mtimes need a bit of special casing
-        if mtime < 0x7fffffff:
-            mtime = int(mtime)
-        else:
-            mtime = int(-0x100000000L + long(mtime))
-    pyc = imp.get_magic() + struct.pack("<i", int(mtime)) + data
+    pyc = imp.get_magic() + struct.pack("<L", int(mtime) & 0xFFFFFFFF) + data
     return pyc
 
 def module_path_to_dotted_name(path):
@@ -184,6 +178,14 @@ class UncompressedZipImportTestCase(ImportHooksBaseTestCase):
                  TESTMOD + pyc_ext: (NOW, badtime_pyc)}
         self.doTest(".py", files, TESTMOD)
 
+    def test2038MTime(self):
+        # Make sure we can handle mtimes larger than what a 32-bit signed number
+        # can hold.
+        twenty_thirty_eight_pyc = make_pyc(test_co, 2**32 - 1)
+        files = {TESTMOD + ".py": (NOW, test_src),
+                 TESTMOD + pyc_ext: (NOW, twenty_thirty_eight_pyc)}
+        self.doTest(".py", files, TESTMOD)
+
     def testPackage(self):
         packdir = TESTPACK + os.sep
         files = {packdir + "__init__" + pyc_ext: (NOW, test_pyc),

==========

Author: Bernhard M. Wiedemann <bwiedemann suse de>
Date: 2022-09-13

More y2038 fixes that are only needed for python2.7

diff --git a/Lib/compiler/pycodegen.py b/Lib/compiler/pycodegen.py
index 6515945..21d52bb 100644
--- a/Lib/compiler/pycodegen.py
+++ b/Lib/compiler/pycodegen.py
@@ -128,7 +128,7 @@ class Module(AbstractCompileMode):
         # to indicate the type of the value.  simplest way to get the
         # same effect is to call marshal and then skip the code.
         mtime = os.path.getmtime(self.filename)
-        mtime = struct.pack('<i', mtime)
+        mtime = struct.pack('<L', mtime & 0xFFFFFFFF)
         return self.MAGIC + mtime
 
 class LocalNameFinder:
diff --git a/Lib/test/test_gzip.py b/Lib/test/test_gzip.py
index cdb1af5..6344ef2 100644
--- a/Lib/test/test_gzip.py
+++ b/Lib/test/test_gzip.py
@@ -265,7 +265,7 @@ class TestGzip(unittest.TestCase):
             self.assertEqual(flagsByte, '\x08') # only the FNAME flag is set
 
             mtimeBytes = fRead.read(4)
-            self.assertEqual(mtimeBytes, struct.pack('<i', mtime)) # little-endian
+            self.assertEqual(mtimeBytes, struct.pack('<L', mtime & 0xFFFFFFFF)) # little-endian
 
             xflByte = fRead.read(1)
             self.assertEqual(xflByte, '\x02') # maximum compression
diff --git a/Python/import.c b/Python/import.c
index b79354b..3efd17f 100644
--- a/Python/import.c
+++ b/Python/import.c
@@ -810,7 +810,7 @@ check_compiled_module(char *pathname, time_t mtime, char *cpathname)
 {
     FILE *fp;
     long magic;
-    long pyc_mtime;
+    unsigned long pyc_mtime;
 
     fp = fopen(cpathname, "rb");
     if (fp == NULL)
@@ -823,7 +823,7 @@ check_compiled_module(char *pathname, time_t mtime, char *cpathname)
         return NULL;
     }
     pyc_mtime = PyMarshal_ReadLongFromFile(fp);
-    if (pyc_mtime != mtime) {
+    if ((pyc_mtime&0xFFFFFFFF) != (((unsigned long)mtime)&0xFFFFFFFF)) {
         if (Py_VerboseFlag)
             PySys_WriteStderr("# %s has bad mtime\n", cpathname);
         fclose(fp);