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 {
GetRealFunctionAddress(const char * func_name,uptr * func_addr,uptr real,uptr wrapper)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 = "__sigaction_siginfo";
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
GetFuncAddrVer(const char * func_name,const char * ver)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