diff options
Diffstat (limited to 'Lib')
| -rw-r--r-- | Lib/pickle.py | 39 |
1 files changed, 26 insertions, 13 deletions
diff --git a/Lib/pickle.py b/Lib/pickle.py index 9e65368..e81a379 100644 --- a/Lib/pickle.py +++ b/Lib/pickle.py @@ -263,7 +263,7 @@ class _Pickler: if i < 256: return BINPUT + bytes([i]) else: - return LONG_BINPUT + pack("<i", i) + return LONG_BINPUT + pack("<I", i) return PUT + repr(i).encode("ascii") + b'\n' @@ -273,7 +273,7 @@ class _Pickler: if i < 256: return BINGET + bytes([i]) else: - return LONG_BINGET + pack("<i", i) + return LONG_BINGET + pack("<I", i) return GET + repr(i).encode("ascii") + b'\n' @@ -503,7 +503,7 @@ class _Pickler: if n < 256: self.write(SHORT_BINBYTES + bytes([n]) + bytes(obj)) else: - self.write(BINBYTES + pack("<i", n) + bytes(obj)) + self.write(BINBYTES + pack("<I", n) + bytes(obj)) self.memoize(obj) dispatch[bytes] = save_bytes @@ -511,7 +511,7 @@ class _Pickler: if self.bin: encoded = obj.encode('utf-8', 'surrogatepass') n = len(encoded) - self.write(BINUNICODE + pack("<i", n) + encoded) + self.write(BINUNICODE + pack("<I", n) + encoded) else: obj = obj.replace("\\", "\\u005c") obj = obj.replace("\n", "\\u000a") @@ -931,6 +931,9 @@ class _Unpickler: def load_long4(self): n = mloads(b'i' + self.read(4)) + if n < 0: + # Corrupt or hostile pickle -- we never write one like this + raise UnpicklingError("LONG pickle has negative byte count"); data = self.read(n) self.append(decode_long(data)) dispatch[LONG4[0]] = load_long4 @@ -959,14 +962,19 @@ class _Unpickler: dispatch[STRING[0]] = load_string def load_binstring(self): + # Deprecated BINSTRING uses signed 32-bit length len = mloads(b'i' + self.read(4)) + if len < 0: + raise UnpicklingError("BINSTRING pickle has negative byte count"); data = self.read(len) value = str(data, self.encoding, self.errors) self.append(value) dispatch[BINSTRING[0]] = load_binstring - def load_binbytes(self): - len = mloads(b'i' + self.read(4)) + def load_binbytes(self, unpack=struct.unpack, maxsize=sys.maxsize): + len, = unpack('<I', self.read(4)) + if len > maxsize: + raise UnpicklingError("BINBYTES exceeds system's maximum size of %d bytes" % maxsize); self.append(self.read(len)) dispatch[BINBYTES[0]] = load_binbytes @@ -974,8 +982,10 @@ class _Unpickler: self.append(str(self.readline()[:-1], 'raw-unicode-escape')) dispatch[UNICODE[0]] = load_unicode - def load_binunicode(self): - len = mloads(b'i' + self.read(4)) + def load_binunicode(self, unpack=struct.unpack, maxsize=sys.maxsize): + len, = unpack('<I', self.read(4)) + if len > maxsize: + raise UnpicklingError("BINUNICODE exceeds system's maximum size of %d bytes" % maxsize); self.append(str(self.read(len), 'utf-8', 'surrogatepass')) dispatch[BINUNICODE[0]] = load_binunicode @@ -1106,6 +1116,9 @@ class _Unpickler: return key = _inverted_registry.get(code) if not key: + if code <= 0: # note that 0 is forbidden + # Corrupt or hostile pickle. + raise UnpicklingError("EXT specifies code <= 0"); raise ValueError("unregistered extension code %d" % code) obj = self.find_class(*key) _extension_cache[code] = obj @@ -1159,8 +1172,8 @@ class _Unpickler: self.append(self.memo[i]) dispatch[BINGET[0]] = load_binget - def load_long_binget(self): - i = mloads(b'i' + self.read(4)) + def load_long_binget(self, unpack=struct.unpack): + i, = unpack('<I', self.read(4)) self.append(self.memo[i]) dispatch[LONG_BINGET[0]] = load_long_binget @@ -1178,9 +1191,9 @@ class _Unpickler: self.memo[i] = self.stack[-1] dispatch[BINPUT[0]] = load_binput - def load_long_binput(self): - i = mloads(b'i' + self.read(4)) - if i < 0: + def load_long_binput(self, unpack=struct.unpack, maxsize=sys.maxsize): + i, = unpack('<I', self.read(4)) + if i > maxsize: raise ValueError("negative LONG_BINPUT argument") self.memo[i] = self.stack[-1] dispatch[LONG_BINPUT[0]] = load_long_binput |