1 // RUN: %clangxx_nsan %s -o %t && %run %t 2>&1 | FileCheck %s 2 3 #include <sanitizer/allocator_interface.h> 4 #include <stdlib.h> 5 #include <unistd.h> 6 7 extern "C" { 8 const volatile void *global_ptr; 9 10 #define WRITE(s) write(1, s, sizeof(s)) 11 12 // Note: avoid calling functions that allocate memory in malloc/free 13 // to avoid infinite recursion. 14 void __sanitizer_malloc_hook(const volatile void *ptr, size_t sz) { 15 if (__sanitizer_get_ownership(ptr) && sz == 4) { 16 WRITE("MallocHook\n"); 17 global_ptr = ptr; 18 } 19 } 20 void __sanitizer_free_hook(const volatile void *ptr) { 21 if (__sanitizer_get_ownership(ptr) && ptr == global_ptr) 22 WRITE("FreeHook\n"); 23 } 24 } // extern "C" 25 26 volatile int *x; 27 28 void MallocHook1(const volatile void *ptr, size_t sz) { WRITE("MH1\n"); } 29 void MallocHook2(const volatile void *ptr, size_t sz) { WRITE("MH2\n"); } 30 void FreeHook1(const volatile void *ptr) { WRITE("FH1\n"); } 31 void FreeHook2(const volatile void *ptr) { WRITE("FH2\n"); } 32 // Call this function with uninitialized arguments to poison 33 // TLS shadow for function parameters before calling operator 34 // new and, eventually, user-provided hook. 35 __attribute__((noinline)) void allocate(int *unused1, int *unused2) { 36 x = new int; 37 } 38 39 int main() { 40 __sanitizer_install_malloc_and_free_hooks(MallocHook1, FreeHook1); 41 __sanitizer_install_malloc_and_free_hooks(MallocHook2, FreeHook2); 42 int *undef1, *undef2; 43 allocate(undef1, undef2); 44 // CHECK: MallocHook 45 // CHECK: MH1 46 // CHECK: MH2 47 // Check that malloc hook was called with correct argument. 48 if (global_ptr != (void *)x) { 49 _exit(1); 50 } 51 *x = 0; 52 delete x; 53 // CHECK: FreeHook 54 // CHECK: FH1 55 // CHECK: FH2 56 return 0; 57 } 58