compiler-rt/test/gwp_asan/heap_buffer_underflow.cpp

   1 // REQUIRES: gwp_asan
   2 // RUN: %clangxx_gwp_asan %s -o %t
   3 // RUN: %expect_crash %run %t 2>&1 | FileCheck %s
   4
   5 // CHECK: GWP-ASan detected a memory error
   6 // CHECK: Buffer Underflow at 0x{{[a-f0-9]+}} (1 byte to the left
   7 // CHECK-SAME: of a {{[1-9][0-9]*}}-byte allocation
   8
   9 #include <cstdlib>
  10
  11 #include "page_size.h"
  12
  13 int main() {
  14   char *Ptr = reinterpret_cast<char *>(malloc(pageSize()));
  15   volatile char x = *(Ptr - 1);
  16   return 0;
  17 }