asan_malloc_win.cc   [plain text]

//===-- asan_malloc_win.cc ------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a part of AddressSanitizer, an address sanity checker.
//
// Windows-specific malloc interception.
//===----------------------------------------------------------------------===//

#include "sanitizer_common/sanitizer_platform.h"
#if SANITIZER_WINDOWS

#include "asan_allocator.h"
#include "asan_interceptors.h"
#include "asan_internal.h"
#include "asan_stack.h"
#include "sanitizer_common/sanitizer_interception.h"

#include <stddef.h>

// ---------------------- Replacement functions ---------------- {{{1
using namespace __asan;  // NOLINT

// FIXME: Simply defining functions with the same signature in *.obj
// files overrides the standard functions in *.lib
// This works well for simple helloworld-like tests but might need to be
// revisited in the future.

// The function attributes will be different for -MD CRT.
// Just introduce an extra macro for now, it will get a different value under
// ASAN_DYNAMIC soon.
#define ALLOCATION_FUNCTION_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE

extern "C" {
ALLOCATION_FUNCTION_ATTRIBUTE
void free(void *ptr) {
  GET_STACK_TRACE_FREE;
  return asan_free(ptr, &stack, FROM_MALLOC);
}

ALLOCATION_FUNCTION_ATTRIBUTE
void _free_dbg(void *ptr, int) {
  free(ptr);
}

ALLOCATION_FUNCTION_ATTRIBUTE
void cfree(void *ptr) {
  CHECK(!"cfree() should not be used on Windows");
}

ALLOCATION_FUNCTION_ATTRIBUTE
void *malloc(size_t size) {
  GET_STACK_TRACE_MALLOC;
  return asan_malloc(size, &stack);
}

ALLOCATION_FUNCTION_ATTRIBUTE
void *_malloc_dbg(size_t size, int, const char *, int) {
  return malloc(size);
}

ALLOCATION_FUNCTION_ATTRIBUTE
void *calloc(size_t nmemb, size_t size) {
  GET_STACK_TRACE_MALLOC;
  return asan_calloc(nmemb, size, &stack);
}

ALLOCATION_FUNCTION_ATTRIBUTE
void *_calloc_dbg(size_t nmemb, size_t size, int, const char *, int) {
  return calloc(nmemb, size);
}

ALLOCATION_FUNCTION_ATTRIBUTE
void *_calloc_impl(size_t nmemb, size_t size, int *errno_tmp) {
  return calloc(nmemb, size);
}

ALLOCATION_FUNCTION_ATTRIBUTE
void *realloc(void *ptr, size_t size) {
  GET_STACK_TRACE_MALLOC;
  return asan_realloc(ptr, size, &stack);
}

ALLOCATION_FUNCTION_ATTRIBUTE
void *_realloc_dbg(void *ptr, size_t size, int) {
  CHECK(!"_realloc_dbg should not exist!");
  return 0;
}

ALLOCATION_FUNCTION_ATTRIBUTE
void *_recalloc(void *p, size_t n, size_t elem_size) {
  if (!p)
    return calloc(n, elem_size);
  const size_t size = n * elem_size;
  if (elem_size != 0 && size / elem_size != n)
    return 0;
  return realloc(p, size);
}

ALLOCATION_FUNCTION_ATTRIBUTE
size_t _msize(void *ptr) {
  GET_CURRENT_PC_BP_SP;
  (void)sp;
  return asan_malloc_usable_size(ptr, pc, bp);
}

ALLOCATION_FUNCTION_ATTRIBUTE
void *_expand(void *memblock, size_t size) {
  // _expand is used in realloc-like functions to resize the buffer if possible.
  // We don't want memory to stand still while resizing buffers, so return 0.
  return 0;
}

ALLOCATION_FUNCTION_ATTRIBUTE
void *_expand_dbg(void *memblock, size_t size) {
  return _expand(memblock, size);
}

// TODO(timurrrr): Might want to add support for _aligned_* allocation
// functions to detect a bit more bugs.  Those functions seem to wrap malloc().

int _CrtDbgReport(int, const char*, int,
                  const char*, const char*, ...) {
  ShowStatsAndAbort();
}

int _CrtDbgReportW(int reportType, const wchar_t*, int,
                   const wchar_t*, const wchar_t*, ...) {
  ShowStatsAndAbort();
}

int _CrtSetReportMode(int, int) {
  return 0;
}
}  // extern "C"

namespace __asan {
void ReplaceSystemMalloc() {
#if defined(_DLL)
# error MD CRT is not yet supported, see PR20214.
#endif
}
}  // namespace __asan

#endif  // _WIN32