Issue #25262. Added support for BINBYTES8 opcode in Python implementation of

unpickler.  Highest 32 bits of 64-bit size for BINUNICODE8 and BINBYTES8
opcodes no longer silently ignored on 32-bit platforms in C implementation.

2 files changed, 28 insertions, 0 deletions

diff --git a/Lib/pickle.py b/Lib/pickle.py
index 6c26c5e..e93057a 100644
--- a/Lib/pickle.py
+++ b/Lib/pickle.py
@@ -1205,6 +1205,14 @@ class _Unpickler:
         self.append(str(self.read(len), 'utf-8', 'surrogatepass'))
     dispatch[BINUNICODE8[0]] = load_binunicode8
 
+    def load_binbytes8(self):
+        len, = unpack('<Q', self.read(8))
+        if len > maxsize:
+            raise UnpicklingError("BINBYTES8 exceeds system's maximum size "
+                                  "of %d bytes" % maxsize)
+        self.append(self.read(len))
+    dispatch[BINBYTES8[0]] = load_binbytes8
+
     def load_short_binstring(self):
         len = self.read(1)[0]
         data = self.read(len)
diff --git a/Lib/test/pickletester.py b/Lib/test/pickletester.py
index 9a2b24b..2ef48e6 100644
--- a/Lib/test/pickletester.py
+++ b/Lib/test/pickletester.py
@@ -857,6 +857,26 @@ class AbstractUnpickleTests(unittest.TestCase):
         self.assert_is_copy([(100,), (100,)],
                             self.loads(b'((Kdtp0\nh\x00l.))'))
 
+    def test_binbytes8(self):
+        dumped = b'\x80\x04\x8e\4\0\0\0\0\0\0\0\xe2\x82\xac\x00.'
+        self.assertEqual(self.loads(dumped), b'\xe2\x82\xac\x00')
+
+    def test_binunicode8(self):
+        dumped = b'\x80\x04\x8d\4\0\0\0\0\0\0\0\xe2\x82\xac\x00.'
+        self.assertEqual(self.loads(dumped), '\u20ac\x00')
+
+    @requires_32b
+    def test_large_32b_binbytes8(self):
+        dumped = b'\x80\x04\x8e\4\0\0\0\1\0\0\0\xe2\x82\xac\x00.'
+        with self.assertRaises((pickle.UnpicklingError, OverflowError)):
+            self.loads(dumped)
+
+    @requires_32b
+    def test_large_32b_binunicode8(self):
+        dumped = b'\x80\x04\x8d\4\0\0\0\1\0\0\0\xe2\x82\xac\x00.'
+        with self.assertRaises((pickle.UnpicklingError, OverflowError)):
+            self.loads(dumped)
+
     def test_get(self):
         pickled = b'((lp100000\ng100000\nt.'
         unpickled = self.loads(pickled)