wolfcrypt/src/random.c:

* add workaround in Hash512_df() for gcc compiler bug around AVX512 and object alignment.
* add missing WC_VERBOSE_RNG clause.

Author: douzzer

wolfcrypt/src/random.c

@@ -1058,8 +1058,16 @@ static int Hash512_df(DRBG_SHA512_internal* drbg, byte* out, word32 outSz,
     byte* digest = drbg->digest_scratch;
 #elif defined(WOLFSSL_SMALL_STACK)
     byte* digest;
+#else
+#if defined(__GNUC__) && !defined(__clang__) && defined(__AVX512F__)
+    /* Use a jumbo alignment to work around a gcc compiler/optimizer bug that
+     * assumes AVX512 alignment in an object sized correctly for AVX512 passed
+     * to builtin memcpy(), which promptly crashes if not thus aligned.
+     */
+    byte digest[WC_SHA512_DIGEST_SIZE] WOLFSSL_ALIGN(WC_SHA512_DIGEST_SIZE);
 #else
     byte digest[WC_SHA512_DIGEST_SIZE];
+#endif
 #endif
 
     if (drbg == NULL) {
@@ -1135,6 +1143,12 @@ static int Hash512_df(DRBG_SHA512_internal* drbg, byte* out, word32 outSz,
     XFREE(digest, drbg->heap, DYNAMIC_TYPE_DIGEST);
 #endif
 
+#ifdef WC_VERBOSE_RNG
+    if (ret != 0)
+        WOLFSSL_DEBUG_PRINTF("ERROR: %s failed with err = %d", __FUNCTION__,
+                             ret);
+#endif
+
     return (ret == 0) ? DRBG_SUCCESS : DRBG_FAILURE;
 }