src/compiler-rt/test/asan/TestCases/Windows/crash_read_write.cc

   1 // RUN: %clangxx_asan -std=c++11 -O0 %s -o %t
   2 // RUN: not %run %t       2>&1 | FileCheck %s --check-prefix=READ
   3 // RUN: not %run %t write 2>&1 | FileCheck %s --check-prefix=WRITE
   4
   5 #include <windows.h>
   6 #include <stdio.h>
   7
   8 static volatile int sink;
   9 __attribute__((noinline)) void Read(int *ptr) { sink = *ptr; }
  10 __attribute__((noinline)) void Write(int *ptr) { *ptr = 0; }
  11 int main(int argc, char **argv) {
  12   // Writes to shadow are detected as reads from shadow gap (because of how the
  13   // shadow mapping works). This is kinda hard to fix. Test a random address in
  14   // the application part of the address space.
  15   void *volatile p = VirtualAlloc(0, 4096, MEM_COMMIT, PAGE_READONLY);
  16   bool ok = VirtualFree(p, 0, MEM_RELEASE);
  17   if (!ok) {
  18     printf("VirtualFree failed\n");
  19     return 0;
  20   }
  21   if (argc == 1)
  22     Read((int *)p);
  23   else
  24     Write((int *)p);
  25 }
  26 // READ: AddressSanitizer: access-violation on unknown address
  27 // READ: The signal is caused by a READ memory access.
  28 // WRITE: AddressSanitizer: access-violation on unknown address
  29 // WRITE: The signal is caused by a WRITE memory access.