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 
main()13 int main() {
14   char *Ptr =
15       reinterpret_cast<char *>(malloc(pageSize()));
16   volatile char x = *(Ptr - 1);
17   return 0;
18 }
19