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Title: gh-146427: Fix use-after-free when clearing interpreter's queue items by aisk · Pull Request #146428 · python/cpython · GitHub

Open Graph Title: gh-146427: Fix use-after-free when clearing interpreter's queue items by aisk · Pull Request #146428 · python/cpython

X Title: gh-146427: Fix use-after-free when clearing interpreter's queue items by aisk · Pull Request #146428 · python/cpython

Description: Test code: from concurrent import interpreters from concurrent.interpreters import _queues as queues q = queues.create() q.put(1) interp = interpreters.create() interp.exec(f"from concurrent.interpreters import _queues as queues; queues.Queue({q.id}).put(2, unbounditems=queues.UNBOUND_REMOVE)") # del interp interp.close() q.put(3) Run with ASan before this change: ./python.exe /tmp/test_queue_uaf.py python.exe(30924,0x7ff855eaedc0) malloc: nano zone abandoned due to inability to reserve vm space. ================================================================= ==30924==ERROR: AddressSanitizer: heap-use-after-free on address 0x603000014758 at pc 0x0002d78f050f bp 0x7ff7b18a0b90 sp 0x7ff7b18a0b88 WRITE of size 8 at 0x603000014758 thread T0 #0 0x2d78f050e in _interpqueues_put _interpqueuesmodule.c.h:265 #1 0x10eb6d600 in _Py_BuiltinCallFastWithKeywords_StackRefSteal ceval.c:859 #2 0x10eb75727 in _PyEval_EvalFrameDefault generated_cases.c.h:2444 #3 0x10eb6ab2e in PyEval_EvalCode ceval.c:686 #4 0x10ed09431 in run_mod pythonrun.c:1472 #5 0x10ed02915 in _PyRun_SimpleFileObject pythonrun.c:518 #6 0x10ed01d12 in _PyRun_AnyFileObject pythonrun.c:81 #7 0x10ed7d9d9 in Py_RunMain main.c:795 #8 0x10ed7f166 in pymain_main main.c:825 #9 0x10ed7f470 in Py_BytesMain main.c:849 #10 0x7ff81410352f in start+0xbef (dyld:x86_64+0xfffffffffffe652f) 0x603000014758 is located 24 bytes inside of 32-byte region [0x603000014740,0x603000014760) freed by thread T0 here: #0 0x10fc07956 in free+0xa6 (libclang_rt.asan_osx_dynamic.dylib:x86_64h+0xdd956) #1 0x2d78f486a in clear_interpreter _interpqueuesmodule.c:1470 #2 0x10ed9975e in _PyAtExit_Fini atexitmodule.c:98 #3 0x10ecf9aa3 in interpreter_clear pystate.c:871 #4 0x10ecee073 in finalize_interp_clear pylifecycle.c:2026 #5 0x10eceabec in Py_EndInterpreter pylifecycle.c:2707 #6 0x10ec150bb in _PyXI_EndInterpreter crossinterp.c:3298 #7 0x2d76e8a0f in _interpreters_destroy _interpretersmodule.c.h:162 #8 0x10e784599 in PyObject_Vectorcall call.c:327 #9 0x10eb6c631 in _Py_VectorCallInstrumentation_StackRefSteal ceval.c:775 #10 0x10eb8b3e9 in _PyEval_EvalFrameDefault generated_cases.c.h:3222 #11 0x10eb6ab2e in PyEval_EvalCode ceval.c:686 #12 0x10ed09431 in run_mod pythonrun.c:1472 #13 0x10ed02915 in _PyRun_SimpleFileObject pythonrun.c:518 #14 0x10ed01d12 in _PyRun_AnyFileObject pythonrun.c:81 #15 0x10ed7d9d9 in Py_RunMain main.c:795 #16 0x10ed7f166 in pymain_main main.c:825 #17 0x10ed7f470 in Py_BytesMain main.c:849 #18 0x7ff81410352f in start+0xbef (dyld:x86_64+0xfffffffffffe652f) previously allocated by thread T0 here: #0 0x10fc0780d in malloc+0x9d (libclang_rt.asan_osx_dynamic.dylib:x86_64h+0xdd80d) #1 0x2d78f017e in _interpqueues_put _interpqueuesmodule.c.h:265 #2 0x10e784599 in PyObject_Vectorcall call.c:327 #3 0x10eb6c631 in _Py_VectorCallInstrumentation_StackRefSteal ceval.c:775 #4 0x10eb9100a in _PyEval_EvalFrameDefault generated_cases.c.h:1841 #5 0x10eb6ab2e in PyEval_EvalCode ceval.c:686 #6 0x2d76ec73b in _run_in_interpreter _interpretersmodule.c:690 #7 0x2d76e9b83 in _interpreters_exec _interpretersmodule.c.h:438 #8 0x10e784599 in PyObject_Vectorcall call.c:327 #9 0x10eb6c631 in _Py_VectorCallInstrumentation_StackRefSteal ceval.c:775 #10 0x10eb8b3e9 in _PyEval_EvalFrameDefault generated_cases.c.h:3222 #11 0x10eb6ab2e in PyEval_EvalCode ceval.c:686 #12 0x10ed09431 in run_mod pythonrun.c:1472 #13 0x10ed02915 in _PyRun_SimpleFileObject pythonrun.c:518 #14 0x10ed01d12 in _PyRun_AnyFileObject pythonrun.c:81 #15 0x10ed7d9d9 in Py_RunMain main.c:795 #16 0x10ed7f166 in pymain_main main.c:825 #17 0x10ed7f470 in Py_BytesMain main.c:849 #18 0x7ff81410352f in start+0xbef (dyld:x86_64+0xfffffffffffe652f) SUMMARY: AddressSanitizer: heap-use-after-free _interpqueuesmodule.c.h:265 in _interpqueues_put Shadow bytes around the buggy address: 0x603000014480: fd fa fa fa fd fd fd fa fa fa fd fd fd fd fa fa 0x603000014500: fd fd fd fa fa fa fd fd fd fa fa fa fd fd fd fa 0x603000014580: fa fa fd fd fd fa fa fa fd fd fd fa fa fa fd fd 0x603000014600: fd fa fa fa fd fd fd fa fa fa fd fd fd fa fa fa 0x603000014680: fd fd fd fd fa fa fd fd fd fa fa fa fd fd fd fd =>0x603000014700: fa fa fd fd fd fa fa fa fd fd fd[fd]fa fa 00 00 0x603000014780: 00 00 fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x603000014800: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x603000014880: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x603000014900: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x603000014980: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa Shadow byte legend (one shadow byte represents 8 application bytes): Addressable: 00 Partially addressable: 01 02 03 04 05 06 07 Heap left redzone: fa Freed heap region: fd Stack left redzone: f1 Stack mid redzone: f2 Stack right redzone: f3 Stack after return: f5 Stack use after scope: f8 Global redzone: f9 Global init order: f6 Poisoned by user: f7 Container overflow: fc Array cookie: ac Intra object redzone: bb ASan internal: fe Left alloca redzone: ca Right alloca redzone: cb ==30924==ABORTING fish: Job 1, './python.exe /tmp/test_queue_ua…' terminated by signal SIGABRT (Abort) After this change, runs without crash or error. Issue: gh-146427

Open Graph Description: Test code: from concurrent import interpreters from concurrent.interpreters import _queues as queues q = queues.create() q.put(1) interp = interpreters.create() interp.exec(f"from concurrent...

X Description: Test code: from concurrent import interpreters from concurrent.interpreters import _queues as queues q = queues.create() q.put(1) interp = interpreters.create() interp.exec(f"from concur...

Opengraph URL: https://github.com/python/cpython/pull/146428

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og:image:altTest code: from concurrent import interpreters from concurrent.interpreters import _queues as queues q = queues.create() q.put(1) interp = interpreters.create() interp.exec(f"from concurrent...
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e66552c Fix use-after-free when clearing interpreter's queue items aisk Mar 25, 2026 https://github.com/python/cpython/pull/146428/commits/e66552c807702ca08190ef51e30906e78ac0ca60
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