mirrors/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-08-04 08:59:19 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 11

bpo-36389: Change PyMem_SetupDebugHooks() constants (GH-12782)

Browse source 
Modify CLEANBYTE, DEADDYTE and FORBIDDENBYTE constants: use 0xCD,
0xDD and 0xFD, rather than 0xCB, 0xBB and 0xFB, to use the same byte
patterns than Windows CRT debug malloc() and free().
This commit is contained in:
Victor Stinner 2019-04-11 13:01:15 +02:00 • committed by GitHub
parent 536a35b3f1
commit 4c409beb4c
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
6 changed files with 37 additions and 24 deletions
Download patch file Download diff file Expand all files Collapse all files

9
Objects/object.c
View file

@ -415,13 +415,12 @@ _Py_BreakPoint(void)
}
/* Heuristic checking if the object memory has been deallocated.
Rely on the debug hooks on Python memory allocators which fills the memory
with DEADBYTE (0xDB) when memory is deallocated.
/* Heuristic checking if the object memory is uninitialized or deallocated.
Rely on the debug hooks on Python memory allocators:
see _PyMem_IsPtrFreed().
The function can be used to prevent segmentation fault on dereferencing
pointers like 0xdbdbdbdbdbdbdbdb. Such pointer is very unlikely to be mapped
in memory. */
pointers like 0xDDDDDDDDDDDDDDDD. */
int
_PyObject_IsFreed(PyObject *op)
{