1 //===-- interception_linux.cc -----------------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file is a part of AddressSanitizer, an address sanity checker. 11 // 12 // Linux-specific interception methods. 13 //===----------------------------------------------------------------------===// 14 15 #include "interception.h" 16 17 #if SANITIZER_LINUX || SANITIZER_FREEBSD || SANITIZER_NETBSD || \ 18 SANITIZER_OPENBSD || SANITIZER_SOLARIS 19 20 #include <dlfcn.h> // for dlsym() and dlvsym() 21 22 #if SANITIZER_NETBSD 23 #include "sanitizer_common/sanitizer_libc.h" 24 #endif 25 26 namespace __interception { 27 bool GetRealFunctionAddress(const char *func_name, uptr *func_addr, 28 uptr real, uptr wrapper) { 29 #if SANITIZER_NETBSD 30 // XXX: Find a better way to handle renames 31 // XXX: Do we have to handle the old __sigaction14 name here too? 32 if (internal_strcmp(func_name, "sigaction") == 0) func_name = "__sigaction_siginfo"; 33 #endif 34 *func_addr = (uptr)dlsym(RTLD_NEXT, func_name); 35 if (!*func_addr) { 36 // If the lookup using RTLD_NEXT failed, the sanitizer runtime library is 37 // later in the library search order than the DSO that we are trying to 38 // intercept, which means that we cannot intercept this function. We still 39 // want the address of the real definition, though, so look it up using 40 // RTLD_DEFAULT. 41 *func_addr = (uptr)dlsym(RTLD_DEFAULT, func_name); 42 } 43 return real == wrapper; 44 } 45 46 // Android and Solaris do not have dlvsym 47 #if !SANITIZER_ANDROID && !SANITIZER_SOLARIS && !SANITIZER_OPENBSD 48 void *GetFuncAddrVer(const char *func_name, const char *ver) { 49 return dlvsym(RTLD_NEXT, func_name, ver); 50 } 51 #endif // !SANITIZER_ANDROID 52 53 } // namespace __interception 54 55 #endif // SANITIZER_LINUX || SANITIZER_FREEBSD || SANITIZER_NETBSD || 56 // SANITIZER_OPENBSD || SANITIZER_SOLARIS 57