gentoo/dev-libs/bglibs/files/bglibs-2.04-stack-buffers.patch

From 25252211283e05c692c8baf3e8a7c70224821762 Mon Sep 17 00:00:00 2001
From: Rolf Eike Beer <eike@sf-mail.de>
Date: Fri, 15 Nov 2019 19:40:22 +0100
Subject: [PATCH] properly align the HMAC state buffers on the stack

They need to have the same alignment as the contained data type, i.e. up to
uint64. Otherwise usage of SHA HMACs causes bus errors on sparc.
---
 crypto/hmac.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/crypto/hmac.c b/crypto/hmac.c
index abff0df..f4e48c0 100644
--- a/crypto/hmac.c
+++ b/crypto/hmac.c
@@ -34,7 +34,8 @@ void hmac_prepare(const struct hmac_control_block* hcb,
 		  void* midstate,
 		  const str* secret)
 {
-  unsigned char state[hcb->state_size];
+  uint64 statebuf[(hcb->state_size + 7) / sizeof(uint64)];
+  unsigned char *state = (unsigned char *)statebuf;
   unsigned char block[hcb->block_size];
   unsigned i;
 
@@ -80,8 +81,9 @@ void hmac_finish(const struct hmac_control_block* hcb,
 		 const str* nonce,
 		 void* output)
 {
-  unsigned char state[hcb->state_size];
-  
+  uint64 statebuf[(hcb->state_size + 7) / sizeof(uint64)];
+  unsigned char *state = (unsigned char *)statebuf;
+
   /* Generate H1 = H(K XOR ipad, nonce) */
   hcb->inject(state, midstate);
   hcb->update(state, (const unsigned char*)nonce->s, nonce->len);
@@ -106,7 +108,8 @@ void hmac(const struct hmac_control_block* hcb,
 	  const str* nonce,
 	  void* output)
 {
-  unsigned char midstate[hcb->state_size*2];
+  uint64 statebuf[(hcb->state_size * 2 + 7) / sizeof(uint64)];
+  unsigned char *midstate = (unsigned char *)statebuf;
 
   hmac_prepare(hcb, midstate, secret);
   hmac_finish(hcb, midstate, nonce, output);