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GH-91079: Implement C stack limits using addresses, not counters. (GH-130007)

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* Implement C recursion protection with limit pointers

* Remove calls to PyOS_CheckStack

* Add stack protection to parser

* Make tests more robust to low stacks

* Improve error messages for stack overflow
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Mark Shannon 2025-02-19 11:44:57 +00:00 • committed by GitHub
parent c637bce20a
commit 2498c22fa0
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47 changed files with 1217 additions and 1463 deletions
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18
Include/pythonrun.h
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@ -21,14 +21,18 @@ PyAPI_FUNC(void) PyErr_DisplayException(PyObject *);
/* Stuff with no proper home (yet) */
PyAPI_DATA(int) (*PyOS_InputHook)(void);
/* Stack size, in "pointers" (so we get extra safety margins
on 64-bit platforms). On a 32-bit platform, this translates
to an 8k margin. */
#define PYOS_STACK_MARGIN 2048
/* Stack size, in "pointers". This must be large enough, so
* no two calls to check recursion depth are more than this far
* apart. In practice, that means it must be larger than the C
* stack consumption of PyEval_EvalDefault */
#if defined(Py_DEBUG) && defined(WIN32)
# define PYOS_STACK_MARGIN 3072
#else
# define PYOS_STACK_MARGIN 2048
#endif
#define PYOS_STACK_MARGIN_BYTES (PYOS_STACK_MARGIN * sizeof(void *))
#if defined(WIN32) && !defined(MS_WIN64) && !defined(_M_ARM) && defined(_MSC_VER) && _MSC_VER >= 1300
/* Enable stack checking under Microsoft C */
// When changing the platforms, ensure PyOS_CheckStack() docs are still correct
#if defined(WIN32)
#define USE_STACKCHECK
#endif