1//===-- dfsan_interceptors.cpp --------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file is a part of DataFlowSanitizer.
10//
11// Interceptors for standard library functions.
12//===----------------------------------------------------------------------===//
13
14#include "dfsan/dfsan.h"
15#include "interception/interception.h"
16#include "sanitizer_common/sanitizer_common.h"
17
18using namespace __sanitizer;
19
20INTERCEPTOR(void *, mmap, void *addr, SIZE_T length, int prot, int flags,
21            int fd, OFF_T offset) {
22  void *res = REAL(mmap)(addr, length, prot, flags, fd, offset);
23  if (res != (void*)-1)
24    dfsan_set_label(0, res, RoundUpTo(length, GetPageSize()));
25  return res;
26}
27
28INTERCEPTOR(void *, mmap64, void *addr, SIZE_T length, int prot, int flags,
29            int fd, OFF64_T offset) {
30  void *res = REAL(mmap64)(addr, length, prot, flags, fd, offset);
31  if (res != (void*)-1)
32    dfsan_set_label(0, res, RoundUpTo(length, GetPageSize()));
33  return res;
34}
35
36namespace __dfsan {
37void InitializeInterceptors() {
38  static int inited = 0;
39  CHECK_EQ(inited, 0);
40
41  INTERCEPT_FUNCTION(mmap);
42  INTERCEPT_FUNCTION(mmap64);
43  inited = 1;
44}
45}  // namespace __dfsan
46