46 lines · cpp
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-exception6//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_AIX18 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, so25 // 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 search27 // 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 __interception45#endif // SANITIZER_AIX46