- dtucker@cvs.openbsd.org 2013/06/03 00:03:18

     [mac.c]
     force the MAC output to be 64-bit aligned so umac won't see unaligned
     accesses on strict-alignment architectures.  bz#2101, patch from
     tomas.kuthan at oracle.com, ok djm@

1 files changed, 11 insertions, 8 deletions

diff --git a/mac.c b/mac.c
index 907e19781..c4dfb501d 100644
--- a/mac.c
+++ b/mac.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: mac.c,v 1.23 2013/05/17 00:13:13 djm Exp $ */
+/* $OpenBSD: mac.c,v 1.24 2013/06/03 00:03:18 dtucker Exp $ */
 /*
  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
  *
@@ -174,12 +174,15 @@ mac_init(Mac *mac)
 u_char *
 mac_compute(Mac *mac, u_int32_t seqno, u_char *data, int datalen)
 {
-        static u_char m[EVP_MAX_MD_SIZE];
+        static union {
+                u_char m[EVP_MAX_MD_SIZE];
+                u_int64_t for_align;
+        } u;
         u_char b[4], nonce[8];
 
-        if (mac->mac_len > sizeof(m))
+        if (mac->mac_len > sizeof(u))
                 fatal("mac_compute: mac too long %u %lu",
-                    mac->mac_len, (u_long)sizeof(m));
+                    mac->mac_len, (u_long)sizeof(u));
 
         switch (mac->type) {
         case SSH_EVP:
@@ -188,22 +191,22 @@ mac_compute(Mac *mac, u_int32_t seqno, u_char *data, int datalen)
                 HMAC_Init(&mac->evp_ctx, NULL, 0, NULL);
                 HMAC_Update(&mac->evp_ctx, b, sizeof(b));
                 HMAC_Update(&mac->evp_ctx, data, datalen);
-                HMAC_Final(&mac->evp_ctx, m, NULL);
+                HMAC_Final(&mac->evp_ctx, u.m, NULL);
                 break;
         case SSH_UMAC:
                 put_u64(nonce, seqno);
                 umac_update(mac->umac_ctx, data, datalen);
-                umac_final(mac->umac_ctx, m, nonce);
+                umac_final(mac->umac_ctx, u.m, nonce);
                 break;
         case SSH_UMAC128:
                 put_u64(nonce, seqno);
                 umac128_update(mac->umac_ctx, data, datalen);
-                umac128_final(mac->umac_ctx, m, nonce);
+                umac128_final(mac->umac_ctx, u.m, nonce);
                 break;
         default:
                 fatal("mac_compute: unknown MAC type");
         }
-        return (m);
+        return (u.m);
 }
 
 void