bpo-41631: Check that importing _ast returns the right module #21973
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@pablogsal, does this make sense for |
Yup, it does sense to me as a temporary solution 👍 |
pablogsal
approved these changes
Sep 8, 2020
pablogsal
reviewed
Sep 8, 2020
Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>
The previous behavior didn't always segfault -- in fact, it usually raised a SystemError as well. A segfault (or any other behavior, depending on the module object imported as _ast) was still *possible*, but for that level of detail people should see the bpo issue.
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Thanks for the workaround. PR 21961 fix has been merged instead. |
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Hopefully #21961 will be OK, but if not: here is a relatively minimal fix for bpo-41631, which basically makes compiling to/from AST fail gracefully (with a proper exception rather than a NULL without exception) if the
_astmodule has been tampered with.For example, it looks like Mercurial's lazy-loading scheme replaces
_astwith a proxy object; this will make AST unusable.The second commit deals with a hack in pegen's tests – please review the commits separately, and see comments.
https://bugs.python.org/issue41631