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