1//===-- interception_aix.cpp ------------------------------------*- C++ -*-===//
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 AddressSanitizer, an address sanity checker.
10//
11// AIX-specific interception methods.
12//===----------------------------------------------------------------------===//
13
14#include "interception.h"
15#include "sanitizer_common/sanitizer_common.h"
16
17#if SANITIZER_AIX
18
19# include <dlfcn.h> // for dlsym()
20
21namespace __interception {
22
23static void *GetFuncAddr(const char *name, uptr wrapper_addr) {
24 // AIX dlsym can only defect the functions that are exported, so
25 // on AIX, we can not intercept some basic functions like memcpy.
26 // FIXME: if we are going to ship dynamic asan library, we may need to search
27 // all the loaded modules with RTLD_DEFAULT if RTLD_NEXT failed.
28 void *addr = dlsym(RTLD_NEXT, name);
29
30 // In case `name' is not loaded, dlsym ends up finding the actual wrapper.
31 // We don't want to intercept the wrapper and have it point to itself.
32 if ((uptr)addr == wrapper_addr)
33 addr = nullptr;
34 return addr;
35}
36
37bool InterceptFunction(const char *name, uptr *ptr_to_real, uptr func,
38 uptr wrapper) {
39 void *addr = GetFuncAddr(name, wrapper);
40 *ptr_to_real = (uptr)addr;
41 return addr && (func == wrapper);
42}
43
44} // namespace __interception
45#endif // SANITIZER_AIX
46