1 // REQUIRES: gwp_asan 2 // RUN: %clangxx_gwp_asan %s -o %t 3 // RUN: %expect_crash %run %t 2>&1 | FileCheck %s 4 5 // RUN: %clangxx_gwp_asan %s -o %t -DTOUCH_GUARD_PAGE 6 // RUN: %expect_crash %run %t 2>&1 | FileCheck %s 7 8 // CHECK: GWP-ASan detected a memory error 9 // CHECK: Use After Free 10 // CHECK-SAME: warning: buffer overflow/underflow detected on a free()'d allocation 11 // CHECK-SAME: at 0x{{[a-f0-9]+}} (1 byte to the left 12 13 #include <cstdlib> 14 15 #include "page_size.h" 16 main()17int main() { 18 unsigned malloc_size = 1; 19 #ifdef TOUCH_GUARD_PAGE 20 malloc_size = pageSize(); 21 #endif // TOUCH_GUARD_PAGE 22 char *Ptr = reinterpret_cast<char *>(malloc(malloc_size)); 23 free(Ptr); 24 volatile char x = *(Ptr - 1); 25 return 0; 26 } 27