libsanitizer/sanitizer_common/sanitizer_mac_libcdep.cpp

   1 //===-- sanitizer_mac_libcdep.cpp -----------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file is shared between various sanitizers' runtime libraries and
  10 // implements OSX-specific functions.
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "sanitizer_platform.h"
  14 #if SANITIZER_APPLE
  15 #include "sanitizer_mac.h"
  16
  17 #include <sys/mman.h>
  18
  19 namespace __sanitizer {
  20
  21 void RestrictMemoryToMaxAddress(uptr max_address) {
  22   uptr size_to_mmap = GetMaxUserVirtualAddress() + 1 - max_address;
  23   void *res = MmapFixedNoAccess(max_address, size_to_mmap, "high gap");
  24   CHECK(res != MAP_FAILED);
  25 }
  26
  27 }  // namespace __sanitizer
  28
  29 #endif  // SANITIZER_APPLE