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 {
GetRealFunctionAddress(const char * func_name,uptr * func_addr,uptr real,uptr wrapper)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
GetFuncAddrVer(const char * func_name,const char * ver)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