| // RUN: %clangxx -O2 %s -o %t && %run %t 2>&1 | FileCheck %s |
| |
| // Malloc/free hooks are not supported on Windows. |
| // XFAIL: target={{.*windows-msvc.*}} |
| |
| // Must not be implemented, no other reason to install interceptors. |
| // XFAIL: ubsan |
| |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <sanitizer/allocator_interface.h> |
| |
| extern "C" { |
| const volatile void *global_ptr; |
| |
| #define WRITE(s) write(1, s, sizeof(s)) |
| |
| // Note: avoid calling functions that allocate memory in malloc/free |
| // to avoid infinite recursion. |
| void __sanitizer_malloc_hook(const volatile void *ptr, size_t sz) { |
| if (__sanitizer_get_ownership(ptr) && sz == sizeof(int)) { |
| WRITE("MallocHook\n"); |
| global_ptr = ptr; |
| } |
| } |
| void __sanitizer_free_hook(const volatile void *ptr) { |
| if (__sanitizer_get_ownership(ptr) && ptr == global_ptr) |
| WRITE("FreeHook\n"); |
| } |
| } // extern "C" |
| |
| volatile int *x; |
| |
| void MallocHook1(const volatile void *ptr, size_t sz) { WRITE("MH1\n"); } |
| void MallocHook2(const volatile void *ptr, size_t sz) { WRITE("MH2\n"); } |
| void FreeHook1(const volatile void *ptr) { WRITE("FH1\n"); } |
| void FreeHook2(const volatile void *ptr) { WRITE("FH2\n"); } |
| // Call this function with uninitialized arguments to poison |
| // TLS shadow for function parameters before calling operator |
| // new and, eventually, user-provided hook. |
| __attribute__((noinline)) void allocate(int *unused1, int *unused2) { |
| x = reinterpret_cast<int *>(malloc(sizeof(int))); |
| } |
| |
| int main() { |
| __sanitizer_install_malloc_and_free_hooks(MallocHook1, FreeHook1); |
| __sanitizer_install_malloc_and_free_hooks(MallocHook2, FreeHook2); |
| int *undef1, *undef2; |
| allocate(undef1, undef2); |
| // CHECK: MallocHook |
| // CHECK: MH1 |
| // CHECK: MH2 |
| // Check that malloc hook was called with correct argument. |
| if (global_ptr != (void*)x) { |
| _exit(1); |
| } |
| |
| // Check that realloc invokes hooks |
| // We realloc to 128 here to avoid potential oversizing by allocators |
| // making this a no-op. |
| x = reinterpret_cast<int *>(realloc((int *)x, sizeof(int) * 128)); |
| // CHECK-DAG: FreeHook{{[[:space:]].*}}FH1{{[[:space:]].*}}FH2 |
| // CHECK-DAG: MH1{{[[:space:]].*}}MH2 |
| |
| x[0] = 0; |
| x[127] = -1; |
| free((void *)x); |
| // CHECK: FH1 |
| // CHECK: FH2 |
| return 0; |
| } |