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1// Test for mmap/munmap interceptors.2// RUN: %clang_asan  %s -o %t3// RUN: %run %t 2>&14 5#include <assert.h>6#include <sanitizer/asan_interface.h>7#include <stdio.h>8#include <stdlib.h>9#include <sys/mman.h>10 11int main(int argc, char **argv) {12  int size = 4096;13  int val = 42;14 15  // Get any mmaped pointer.16  void *r =17      mmap(0, size, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0);18  assert(r != MAP_FAILED);19 20  // Make sure the memory is unpoisoned.21  if (__asan_region_is_poisoned(r, size) != 0) {22    fprintf(stderr, "Memory returned by mmap should be unpoisoned.\n");23    abort();24  }25 26  // First munmmap and then mmap the same pointer using MAP_FIXED.27  __asan_poison_memory_region(r, size);28  munmap(r, size);29  if (__asan_region_is_poisoned(r, size) != 0) {30    fprintf(stderr, "Shadow memory was not cleaned by munmap.\n");31    abort();32  }33  __asan_poison_memory_region(r, size);34  void *p = mmap(r, size, PROT_READ | PROT_WRITE,35                 MAP_FIXED | MAP_ANON | MAP_PRIVATE, -1, 0);36  assert(r == p);37 38  // Make sure the memory is unpoisoned.39  if (__asan_region_is_poisoned(r, size) != 0) {40    fprintf(stderr, "Memory returned by mmap should be unpoisoned.\n");41    abort();42  }43 44  return 0;45}46