commit 3b2a45ff95a68acc8276b37678c98740a232f6d4
author Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Wed May 05 15:05:22 2021 -0700
committer GitHub <noreply@github.com> Wed May 05 15:05:22 2021 -0700
tree 565ab4858c5f3b57b95b6ef018913baefb1dc123
parent 8f3ef457ad286e73f272dadec8b98d2ea3a6ec72

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 <greg@krypto.org>

Modules/_sha3/sha3module.c

diff --git a/Modules/_sha3/sha3module.c b/Modules/_sha3/sha3module.c
index aba7f6d..3974e0b 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