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| author |   Victor Stinner <vstinner@redhat.com> | 2018-11-22 17:40:53 +0100 |
|---|---|---|
| committer |   GitHub <noreply@github.com> | 2018-11-22 17:40:53 +0100 |
| commit | c9b3fc6b59b625c36c31ad437253e7140938af1a (patch) | |
| tree | b38312e30130c19f67b8874556c76e1c317e9d89 /Include | |
| parent | bpo-24658: os.read() reuses _PY_READ_MAX (GH-10657) (diff) | |
| download | cpython-c9b3fc6b59b625c36c31ad437253e7140938af1a.tar.gz cpython-c9b3fc6b59b625c36c31ad437253e7140938af1a.tar.bz2 cpython-c9b3fc6b59b625c36c31ad437253e7140938af1a.zip | |
bpo-9263: _PyObject_Dump() detects freed memory (GH-10061) (GH-10662) (GH-10663)
* bpo-9263: _PyObject_Dump() detects freed memory (GH-10061)
_PyObject_Dump() now uses an heuristic to check if the object memory
has been freed: log "<freed object>" in that case.
The heuristic rely on the debug hooks on Python memory allocators
which fills the memory with DEADBYTE (0xDB) when memory is
deallocated. Use PYTHONMALLOC=debug to always enable these debug
hooks.
(cherry picked from commit 82af0b63b07aa8d92b50098e382b458143cfc677)
* bpo-9263: Fix _PyObject_Dump() for freed object (#10661)
If _PyObject_Dump() detects that the object is freed, don't try to
dump it (exit immediately).
Enhance also _PyObject_IsFreed(): it now detects if the pointer
itself looks like freed memory.
(cherry picked from commit 2cf5d32fd9e61488e8b0be55a2e92a752ba8b06b)
(cherry picked from commit 95036ea25d47f0081bda2ba96ea327f3375cb6a4)
Diffstat (limited to 'Include')
| -rw-r--r-- | Include/object.h | 1 | ||||
| -rw-r--r-- | Include/pymem.h | 4 |
2 files changed, 4 insertions, 1 deletions
diff --git a/Include/object.h b/Include/object.h index 63e37b8d33a..deac9409724 100644 --- a/Include/object.h +++ b/Include/object.h @@ -520,6 +520,7 @@ struct _Py_Identifier; PyAPI_FUNC(int) PyObject_Print(PyObject *, FILE *, int); PyAPI_FUNC(void) _Py_BreakPoint(void); PyAPI_FUNC(void) _PyObject_Dump(PyObject *); +PyAPI_FUNC(int) _PyObject_IsFreed(PyObject *); #endif PyAPI_FUNC(PyObject *) PyObject_Repr(PyObject *); PyAPI_FUNC(PyObject *) PyObject_Str(PyObject *); diff --git a/Include/pymem.h b/Include/pymem.h index a7eb4d2e594..a9f0186bd97 100644 --- a/Include/pymem.h +++ b/Include/pymem.h @@ -59,7 +59,9 @@ PyAPI_FUNC(int) _PyTraceMalloc_Untrack( PyAPI_FUNC(PyObject*) _PyTraceMalloc_GetTraceback( _PyTraceMalloc_domain_t domain, uintptr_t ptr); -#endif /* !Py_LIMITED_API */ + +PyAPI_FUNC(int) _PyMem_IsFreed(void *ptr, size_t size); +#endif /* !defined(Py_LIMITED_API) */ /* BEWARE: |