Pickle deserialization null byte discrepancy

Bug report

Bug description:

In C, the null byte indicates the end of a char[]. In INT and LONG opcodes for pickle, everything up to a newline is read from the bytestream and ran through a string to integer conversion function. However, a bytestream like b'L1\x00anything\n.' or b'I1\x00anything\n.' does not fail in _pickle.c (like it does in pickle.py and pickletools.py) due to the null byte.

On line 5208 (for INT) and line 5362 (for LONG), _Unpickler_Readline(state, self, &s) reads everything (including a null byte) into the s variable, which is char *. However, strtol or PyLong_FromString (1, 2) stop when the first null byte is encountered, meaning everything including and after the null byte is ignored, returning 1 (in the above example).

It's a small inconsistency as an edge case, but I'm not sure how to fix it, or whether having it stopped at a null byte is desired behavior or not.

Edit - this also applies to FLOAT.

CPython versions tested on:

3.11

Operating systems tested on:

Linux

Linked PRs

• gh-157728

首先重现 INT 和 LONG 的 null 字节示例，以及 FLOAT 情况，并将 _pickle.c 与 pickle.py 和 pickletools.py 进行比较。检查 Modules/_pickle.c 第 5208、5216、5223、5362 和 5374 行附近的代码；done 要求确定预期行为，并使各实现一致地处理这些输入。