From da5f9e045211882b2cd304fb60b90788edf51576 Mon Sep 17 00:00:00 2001 From: "Gregory P. Smith" Date: Wed, 5 May 2021 13:55:33 -0700 Subject: [PATCH] bpo-36515: Disable unaligned memory access in _sha3 on ARM (GH-25927) Contributed-By: Matthias Klose Automerge-Triggered-By: GH:tiran (cherry picked from commit da5c808fb50d34bc2e180d9481706072f33025da) Co-authored-by: Gregory P. Smith --- .../next/Library/2021-05-05-11-44-49.bpo-36515.uOSa3q.rst | 2 ++ Modules/_sha3/sha3module.c | 5 +++++ 2 files changed, 7 insertions(+) create mode 100644 Misc/NEWS.d/next/Library/2021-05-05-11-44-49.bpo-36515.uOSa3q.rst diff --git a/Misc/NEWS.d/next/Library/2021-05-05-11-44-49.bpo-36515.uOSa3q.rst b/Misc/NEWS.d/next/Library/2021-05-05-11-44-49.bpo-36515.uOSa3q.rst new file mode 100644 index 00000000000000..dd24474c2fde7e --- /dev/null +++ b/Misc/NEWS.d/next/Library/2021-05-05-11-44-49.bpo-36515.uOSa3q.rst @@ -0,0 +1,2 @@ +The :mod:`hashlib` module no longer does unaligned memory accesses when +compiled for ARM platforms. diff --git a/Modules/_sha3/sha3module.c b/Modules/_sha3/sha3module.c index c826b42df13f92..b6a7130dd86974 100644 --- a/Modules/_sha3/sha3module.c +++ b/Modules/_sha3/sha3module.c @@ -64,6 +64,11 @@ #define PLATFORM_BYTE_ORDER IS_BIG_ENDIAN #endif +/* Prevent bus errors on platforms requiring aligned accesses such ARM. */ +#if HAVE_ALIGNED_REQUIRED && !defined(NO_MISALIGNED_ACCESSES) +#define NO_MISALIGNED_ACCESSES +#endif + /* mangle names */ #define KeccakF1600_FastLoop_Absorb _PySHA3_KeccakF1600_FastLoop_Absorb #define Keccak_HashFinal _PySHA3_Keccak_HashFinal