mirrors/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-08-04 00:48:58 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 8

bpo-45521: Fix a bug in the obmalloc radix tree code. (GH-29051) (GH-29122)

Browse source 
MAP_BOT_LENGTH was incorrectly used to compute MAP_TOP_MASK instead of
MAP_TOP_LENGTH. On 64-bit machines, the error causes the tree to hold
46-bits of virtual addresses, rather than the intended 48-bits.
(cherry picked from commit 311910b31a)
This commit is contained in:
Miss Islington (bot) 2021-10-21 08:39:58 -07:00 • committed by GitHub
parent 00ddc1fbd7
commit 1cdac61065
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
2 changed files with 4 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

3
Misc/NEWS.d/next/Core and Builtins/2021-10-18-22-40-33.bpo-45521.GdMiuW.rst Normal file
View file

@ -0,0 +1,3 @@
Fix a bug in the obmalloc radix tree code. On 64-bit machines, the bug
causes the tree to hold 46-bits of virtual addresses, rather than the
intended 48-bits.

2
Objects/obmalloc.c
View file

@ -1328,7 +1328,7 @@ _Py_GetAllocatedBlocks(void)
#define MAP_TOP_BITS INTERIOR_BITS
#define MAP_TOP_LENGTH (1 << MAP_TOP_BITS)
#define MAP_TOP_MASK (MAP_BOT_LENGTH - 1)
#define MAP_TOP_MASK (MAP_TOP_LENGTH - 1)
#define MAP_MID_BITS INTERIOR_BITS
#define MAP_MID_LENGTH (1 << MAP_MID_BITS)