8000 [3.6] bpo-9263: _PyObject_Dump() detects freed memory (GH-10061) (GH-10662) by vstinner · Pull Request #10663 · python/cpython · GitHub
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[3.6] bpo-9263: _PyObject_Dump() detects freed memory (GH-10061) (GH-10662) #10663

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Merged
merged 1 commit into from
Nov 22, 2018
Merged

[3.6] bpo-9263: _PyObject_Dump() detects freed memory (GH-10061) (GH-10662) #10663

merged 1 commit into from
Nov 22, 2018

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@vstinner vstinner commented Nov 22, 2018 •
edited by bedevere-bot
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_PyObject_Dump() now uses an heuristic to check if the object memory
has been freed: log "" 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 82af0b6)

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 2cf5d32)
(cherry picked from commit 95036ea)

https://bugs.python.org/issue9263

@vstinner
[3.7] bpo-9263: _PyObject_Dump() detects freed memory (GH-10061) (GH-…
516fede 
…10662)

* 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 82af0b6)

* 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 2cf5d32)
(cherry picked from commit 95036ea)
@bedevere-bot bedevere-bot mentioned this pull request Nov 22, 2018
Merged
@vstinner vstinner merged commit c9b3fc6 into python:3.6 Nov 22, 2018
@vstinner vstinner deleted the object_dump36 branch November 22, 2018 16:40
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@vstinner @the-knights-who-say-ni @bedevere-bot
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