This release is a security fix for PyO3 0.22.0 through 0.22.3.
The PyWeakrefMethods trait functions for reading borrowed values from Python weak references have been identified as unsound, because they did not account for the possibility the last strong reference could be cleared at any time, leading the borrowed value to be dangling and risk of use-after-free.
PyO3 0.22.4 protects against this issue by making these methods permanently leak strong references. The methods are also marked deprecated and will be removed in PyO3 0.23. Users should switch to use the use PyWeakrefMethods functions which return owned references (the deprecation messages indicate the appropriate upgrade paths).
These functions were added in PyO3 0.22.0; all versions from 0.22.0 through 0.22.3 have been yanked.
Aside from the security fix, PyO3 0.22.4 contains a number of other bugfixes, including:
A fix for cases where __traverse__ functions of base types were not called when using #[pyclass(extends = ...)]
A fix for a regression in 0.22.3 where PyO3 generated code would trigger compile failures with crates using #![forbid(unsafe_code)]
Thank you to the following contributors for the improvements:
This release contains a number of quality improvements building upon PyO3 0.22.2.
Python function calls (using .call0(), .call1(args) and .call(args, kwargs)) will now make use of the "vectorcall" calling conventions where possible, which can reduce overheads in many cases.
There have been several fix-ups to PyO3's FFI definitions. A new pyo3::ffi::compat namespace has been added which offers some backwards-compatible implementations of Python APIs otherwise normally only available on recent Pythons.
There have been numerous other bug-fixes and minor tweaks to improve user experience.
Thank you to the following contributors for the improvements:
This release contains some minor reliability fixes building upon PyO3 0.22.1.
As PyO3 is still working on supporting freethreaded Python (upcoming in 3.13), support has been gated behind an UNSAFE_PYO3_BUILD_FREE_THREADED=1 environment variable to avoid unsuspecting users running into broken builds.
Packages built for the abi3 stable ABI will now use FFI functions for refcounting instead of inline reference count modifications on all versions of the stable ABI (previously only abi3 builds for 3.12 and up would use FFI functions). This helps mitigate interactions of old versions of the stable ABI with future CPython releases which do more complex reference counting (e.g. immortal objects, freethreaded reference counting).
The #[pymodule] declarative module now supports directly receiving options. (E.g. #[pymodule(name = "foo")], which would previously have been written as two attributes #[pymodule] #[pyo3(name = "foo")].)
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Bumps pyo3 from 0.21.2 to 0.22.4.
Release notes
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Changelog
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Commits
dff9723
release: 0.22.43330bf2
fix garbage collection in inheritance cases (#4563)8b23397
ci: pypy 3.7 macos on x64 stillce63713
ci: run benchmarks on ubuntu 22.04 (#4609)b1173f5
ci: fix more ubuntu-24.04 failures (#4610)7371028
ci: move more jobs to macOS arm (#4600)8e3dc45
avoid callingPyType_GetSlot
on static types before Python 3.10 (#4599)969300d
leak references for safety inPyWeakRefMethods::upgrade_borrowed
(#4590)d01fbab
fix case of gil-refs feature breakingcreate_exception!
macro (#4589)9a641f7
fix unintentionalunsafe_code
trigger (#4574)Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting
@dependabot rebase
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