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interception_linux.cc revision 1.1 
      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   if (internal_strcmp(func_name, "sigaction") == 0) func_name = "__sigaction14";
     32 #endif
     33   *func_addr = (uptr)dlsym(RTLD_NEXT, func_name);
     34   if (!*func_addr) {
     35     // If the lookup using RTLD_NEXT failed, the sanitizer runtime library is
     36     // later in the library search order than the DSO that we are trying to
     37     // intercept, which means that we cannot intercept this function. We still
     38     // want the address of the real definition, though, so look it up using
     39     // RTLD_DEFAULT.
     40     *func_addr = (uptr)dlsym(RTLD_DEFAULT, func_name);
     41   }
     42   return real == wrapper;
     43 }
     44 
     45 // Android and Solaris do not have dlvsym
     46 #if !SANITIZER_ANDROID && !SANITIZER_SOLARIS && !SANITIZER_OPENBSD
     47 void *GetFuncAddrVer(const char *func_name, const char *ver) {
     48   return dlvsym(RTLD_NEXT, func_name, ver);
     49 }
     50 #endif  // !SANITIZER_ANDROID
     51 
     52 }  // namespace __interception
     53 
     54 #endif  // SANITIZER_LINUX || SANITIZER_FREEBSD || SANITIZER_NETBSD ||
     55         // SANITIZER_OPENBSD || SANITIZER_SOLARIS
     56