1 // RUN: %clangxx -O2 %s -o %t && %run %t 2>&1 | FileCheck %s
2 
3 // Malloc/free hooks are not supported on Windows.
4 // XFAIL: windows-msvc
5 // XFAIL: ubsan
6 
7 #include <stdlib.h>
8 #include <unistd.h>
9 #include <sanitizer/allocator_interface.h>
10 
11 extern "C" {
12 const volatile void *global_ptr;
13 
14 #define WRITE(s) write(1, s, sizeof(s))
15 
16 // Note: avoid calling functions that allocate memory in malloc/free
17 // to avoid infinite recursion.
18 void __sanitizer_malloc_hook(const volatile void *ptr, size_t sz) {
19   if (__sanitizer_get_ownership(ptr) && sz == 4) {
20     WRITE("MallocHook\n");
21     global_ptr = ptr;
22   }
23 }
24 void __sanitizer_free_hook(const volatile void *ptr) {
25   if (__sanitizer_get_ownership(ptr) && ptr == global_ptr)
26     WRITE("FreeHook\n");
27 }
28 }  // extern "C"
29 
30 volatile int *x;
31 
32 void MallocHook1(const volatile void *ptr, size_t sz) { WRITE("MH1\n"); }
33 void MallocHook2(const volatile void *ptr, size_t sz) { WRITE("MH2\n"); }
34 void FreeHook1(const volatile void *ptr) { WRITE("FH1\n"); }
35 void FreeHook2(const volatile void *ptr) { WRITE("FH2\n"); }
36 // Call this function with uninitialized arguments to poison
37 // TLS shadow for function parameters before calling operator
38 // new and, eventually, user-provided hook.
39 __attribute__((noinline)) void allocate(int *unused1, int *unused2) {
40   x = new int;
41 }
42 
43 int main() {
44   __sanitizer_install_malloc_and_free_hooks(MallocHook1, FreeHook1);
45   __sanitizer_install_malloc_and_free_hooks(MallocHook2, FreeHook2);
46   int *undef1, *undef2;
47   allocate(undef1, undef2);
48   // CHECK: MallocHook
49   // CHECK: MH1
50   // CHECK: MH2
51   // Check that malloc hook was called with correct argument.
52   if (global_ptr != (void*)x) {
53     _exit(1);
54   }
55   *x = 0;
56   delete x;
57   // CHECK: FreeHook
58   // CHECK: FH1
59   // CHECK: FH2
60   return 0;
61 }
62