Make sure that our version of certain utility function implementations gets used in the firmware.

firmware/stub/utility_stub.c

 /* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  *
  * Stub implementations of utility functions which call their linux-specific
  * equivalents.
  */
 
 #define _STUB_IMPLEMENTATION_
 #include "utility.h"
@@ skipping 33 matching lines @@
   free(ptr);
 }
 
 int Memcmp(const void* src1, const void* src2, size_t n) {
   return memcmp(src1, src2, n);
 }
 
 void* Memcpy(void* dest, const void* src, uint64_t n) {
   return memcpy(dest, src, (size_t)n);
 }
-
-void* Memset(void* d, const uint8_t c, uint64_t n) {
-  uint8_t* dest = d; /* the only way to keep both cl and gcc happy */
-  while (n--) {
-    *dest++ = c;
-  }
-  return dest;
-}
-
-
-int SafeMemcmp(const void* s1, const void* s2, size_t n) {
-  int result = 0;
-  if (0 == n)
-    return 1;
-
-  const unsigned char* us1 = s1;
-  const unsigned char* us2 = s2;
-  /* Code snippet without data-dependent branch due to
-   * Nate Lawson (nate@root.org) of Root Labs. */
-  while (n--)
-    result |= *us1++ ^ *us2++;
-
-  return result != 0;
-}