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. 30
