pymodule: only allow initializing once per process #2523
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adamreichold
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Aug 9, 2022
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zer0def
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Nov 8, 2024
Allow the subinterpreter safeguards to be disabled, so that applications like Ceph's manager can continue to use pyo3 modules without soft crashing. Enabling this feature should be done with caution, as any storage of Py objects in rust statics can lead to undefined behavior. However, not all consumers of pyo3 use global state, and thus a subset of them (such as python-bcrypt) are safe to use in subinterpreter contexts. References: bazaah/aur-ceph#20 References: PyO3#2523 References: pyca/cryptography#9016 References: PyO3#2346 (comment) References: PyO3#2346 (comment) References: PyO3#3451 Signed-off-by: Paul Stemmet <github@luxolus.com>
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Following the suggestion in #2346 (comment) this changes
#[pymodule]to raise anImportErrorif initialised more than once. This seems to be a necessary defence against soundness issues related to sub-interpreters.