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.
__sanitizer_malloc_hook(const volatile void * ptr,size_t sz)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 }
__sanitizer_free_hook(const volatile void * ptr)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
MallocHook1(const volatile void * ptr,size_t sz)32 void MallocHook1(const volatile void *ptr, size_t sz) { WRITE("MH1\n"); }
MallocHook2(const volatile void * ptr,size_t sz)33 void MallocHook2(const volatile void *ptr, size_t sz) { WRITE("MH2\n"); }
FreeHook1(const volatile void * ptr)34 void FreeHook1(const volatile void *ptr) { WRITE("FH1\n"); }
FreeHook2(const volatile void * ptr)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.
allocate(int * unused1,int * unused2)39 __attribute__((noinline)) void allocate(int *unused1, int *unused2) {
40 x = new int;
41 }
42
main()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