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gh-50644: Forbid pickling of codecs streams (GH-109180)

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Attempts to pickle or create a shallow or deep copy of codecs streams
now raise a TypeError.

Previously, copying failed with a RecursionError, while pickling
produced wrong results that eventually caused unpickling to fail with
a RecursionError.
This commit is contained in:
Serhiy Storchaka 2023-09-10 20:06:09 +03:00 • committed by GitHub
parent 71b6e2602c
commit d6892c2b92
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3 changed files with 95 additions and 0 deletions
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12
Lib/codecs.py
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@ -414,6 +414,9 @@ class StreamWriter(Codec):
def __exit__(self, type, value, tb):
self.stream.close()
def __reduce_ex__(self, proto):
raise TypeError("can't serialize %s" % self.__class__.__name__)
###
class StreamReader(Codec):
@ -663,6 +666,9 @@ class StreamReader(Codec):
def __exit__(self, type, value, tb):
self.stream.close()
def __reduce_ex__(self, proto):
raise TypeError("can't serialize %s" % self.__class__.__name__)
###
class StreamReaderWriter:
@ -750,6 +756,9 @@ class StreamReaderWriter:
def __exit__(self, type, value, tb):
self.stream.close()
def __reduce_ex__(self, proto):
raise TypeError("can't serialize %s" % self.__class__.__name__)
###
class StreamRecoder:
@ -866,6 +875,9 @@ class StreamRecoder:
def __exit__(self, type, value, tb):
self.stream.close()
def __reduce_ex__(self, proto):
raise TypeError("can't serialize %s" % self.__class__.__name__)
### Shortcuts
def open(filename, mode='r', encoding=None, errors='strict', buffering=-1):