gh-135241: Changed the opcode of _pickle module to look for 00 and 01 specifically#135242
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serhiy-storchaka merged 8 commits intopython:mainfrom Aug 14, 2025
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The python pickle module looks for "00" and "01" but _pickle only looked for 2 characters that parsed to 0 or 1, meaning some payloads like "+0" or " 0" would lead to different results in different implementations
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Lib/test/test_pickle.py
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| # when getting booleans from the INT opcode. Doing a str comparison | ||
| # to bypass truthy/falsy comparisons. These payloads should return | ||
| # 0, not False. | ||
| out1 = self.loads(b'I+0\n.') |
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The INT opcode only looks specifically for the b'I01' and b'I00' values to convert to True/False. Because of #126992, both implementations specifically use base 10 so b'I001' will push 1 to the stack for both, so that shouldn't be relevant here I don't think.
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LGTM, small formatting nitpick
Misc/NEWS.d/next/Library/2025-06-08-01-10-34.gh-issue-135241.5j18IW.rst
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…j18IW.rst Co-authored-by: Sergey B Kirpichev <skirpichev@gmail.com>
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
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Merged both suggested changes - thanks! |
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
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pythonGH-135242) The Python pickle module looks for "00" and "01" but _pickle only looked for 2 characters that parsed to 0 or 1, meaning some payloads like "+0" or " 0" would lead to different results in different implementations.
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The python pickle module looks for "00" and "01" but _pickle only looked for 2 characters that parsed to 0 or 1, meaning some payloads like "+0" or " 0" would lead to different results in different implementations. See more details in the linked issue.
This solution simply checks for the hard-coded chars ensuring no edge cases go by.
INTopcode boolean conversion discrepancy #135241