libsanitizer/asan/asan_win_dll_thunk.cpp

   1 //===-- asan_win_dll_thunk.cpp --------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file is a part of AddressSanitizer, an address sanity checker.
  10 //
  11 // This file defines a family of thunks that should be statically linked into
  12 // the DLLs that have ASan instrumentation in order to delegate the calls to the
  13 // shared runtime that lives in the main binary.
  14 // See https://github.com/google/sanitizers/issues/209 for the details.
  15 //===----------------------------------------------------------------------===//
  16
  17 #ifdef SANITIZER_DLL_THUNK
  18 #include "asan_init_version.h"
  19 #include "interception/interception.h"
  20 #include "sanitizer_common/sanitizer_win_defs.h"
  21 #include "sanitizer_common/sanitizer_win_dll_thunk.h"
  22 #include "sanitizer_common/sanitizer_platform_interceptors.h"
  23
  24 // ASan own interface functions.
  25 #define INTERFACE_FUNCTION(Name) INTERCEPT_SANITIZER_FUNCTION(Name)
  26 #define INTERFACE_WEAK_FUNCTION(Name) INTERCEPT_SANITIZER_WEAK_FUNCTION(Name)
  27 #include "asan_interface.inc"
  28
  29 // Memory allocation functions.
  30 INTERCEPT_WRAP_V_W(free)
  31 INTERCEPT_WRAP_V_W(_free_base)
  32 INTERCEPT_WRAP_V_WW(_free_dbg)
  33
  34 INTERCEPT_WRAP_W_W(malloc)
  35 INTERCEPT_WRAP_W_W(_malloc_base)
  36 INTERCEPT_WRAP_W_WWWW(_malloc_dbg)
  37
  38 INTERCEPT_WRAP_W_WW(calloc)
  39 INTERCEPT_WRAP_W_WW(_calloc_base)
  40 INTERCEPT_WRAP_W_WWWWW(_calloc_dbg)
  41 INTERCEPT_WRAP_W_WWW(_calloc_impl)
  42
  43 INTERCEPT_WRAP_W_WW(realloc)
  44 INTERCEPT_WRAP_W_WW(_realloc_base)
  45 INTERCEPT_WRAP_W_WWW(_realloc_dbg)
  46 INTERCEPT_WRAP_W_WWW(_recalloc)
  47 INTERCEPT_WRAP_W_WWW(_recalloc_base)
  48
  49 INTERCEPT_WRAP_W_W(_msize)
  50 INTERCEPT_WRAP_W_W(_msize_base)
  51 INTERCEPT_WRAP_W_W(_expand)
  52 INTERCEPT_WRAP_W_W(_expand_dbg)
  53
  54 // TODO(timurrrr): Might want to add support for _aligned_* allocation
  55 // functions to detect a bit more bugs.  Those functions seem to wrap malloc().
  56
  57 // TODO(timurrrr): Do we need to add _Crt* stuff here? (see asan_malloc_win.cpp)
  58
  59 INTERCEPT_LIBRARY_FUNCTION(atoi);
  60 INTERCEPT_LIBRARY_FUNCTION(atol);
  61 INTERCEPT_LIBRARY_FUNCTION(frexp);
  62 INTERCEPT_LIBRARY_FUNCTION(longjmp);
  63 #if SANITIZER_INTERCEPT_MEMCHR
  64 INTERCEPT_LIBRARY_FUNCTION(memchr);
  65 #endif
  66 INTERCEPT_LIBRARY_FUNCTION(memcmp);
  67 INTERCEPT_LIBRARY_FUNCTION(memcpy);
  68 INTERCEPT_LIBRARY_FUNCTION(memmove);
  69 INTERCEPT_LIBRARY_FUNCTION(memset);
  70 INTERCEPT_LIBRARY_FUNCTION(strcat);
  71 INTERCEPT_LIBRARY_FUNCTION(strchr);
  72 INTERCEPT_LIBRARY_FUNCTION(strcmp);
  73 INTERCEPT_LIBRARY_FUNCTION(strcpy);
  74 INTERCEPT_LIBRARY_FUNCTION(strcspn);
  75 INTERCEPT_LIBRARY_FUNCTION(strdup);
  76 INTERCEPT_LIBRARY_FUNCTION(strlen);
  77 INTERCEPT_LIBRARY_FUNCTION(strncat);
  78 INTERCEPT_LIBRARY_FUNCTION(strncmp);
  79 INTERCEPT_LIBRARY_FUNCTION(strncpy);
  80 INTERCEPT_LIBRARY_FUNCTION(strnlen);
  81 INTERCEPT_LIBRARY_FUNCTION(strpbrk);
  82 INTERCEPT_LIBRARY_FUNCTION(strrchr);
  83 INTERCEPT_LIBRARY_FUNCTION(strspn);
  84 INTERCEPT_LIBRARY_FUNCTION(strstr);
  85 INTERCEPT_LIBRARY_FUNCTION(strtok);
  86 INTERCEPT_LIBRARY_FUNCTION(strtol);
  87 INTERCEPT_LIBRARY_FUNCTION(wcslen);
  88 INTERCEPT_LIBRARY_FUNCTION(wcsnlen);
  89
  90 #ifdef _WIN64
  91 INTERCEPT_LIBRARY_FUNCTION(__C_specific_handler);
  92 #else
  93 INTERCEPT_LIBRARY_FUNCTION(_except_handler3);
  94 // _except_handler4 checks -GS cookie which is different for each module, so we
  95 // can't use INTERCEPT_LIBRARY_FUNCTION(_except_handler4).
  96 INTERCEPTOR(int, _except_handler4, void *a, void *b, void *c, void *d) {
  97   __asan_handle_no_return();
  98   return REAL(_except_handler4)(a, b, c, d);
  99 }
 100 #endif
 101
 102 // Windows specific functions not included in asan_interface.inc.
 103 INTERCEPT_WRAP_W_V(__asan_should_detect_stack_use_after_return)
 104 INTERCEPT_WRAP_W_V(__asan_get_shadow_memory_dynamic_address)
 105 INTERCEPT_WRAP_W_W(__asan_unhandled_exception_filter)
 106
 107 using namespace __sanitizer;
 108
 109 extern "C" {
 110 int __asan_option_detect_stack_use_after_return;
 111 uptr __asan_shadow_memory_dynamic_address;
 112 } // extern "C"
 113
 114 static int asan_dll_thunk_init() {
 115   typedef void (*fntype)();
 116   static fntype fn = 0;
 117   // asan_dll_thunk_init is expected to be called by only one thread.
 118   if (fn) return 0;
 119
 120   // Ensure all interception was executed.
 121   __dll_thunk_init();
 122
 123   fn = (fntype) dllThunkGetRealAddrOrDie("__asan_init");
 124   fn();
 125   __asan_option_detect_stack_use_after_return =
 126       (__asan_should_detect_stack_use_after_return() != 0);
 127   __asan_shadow_memory_dynamic_address =
 128       (uptr)__asan_get_shadow_memory_dynamic_address();
 129
 130 #ifndef _WIN64
 131   INTERCEPT_FUNCTION(_except_handler4);
 132 #endif
 133   // In DLLs, the callbacks are expected to return 0,
 134   // otherwise CRT initialization fails.
 135   return 0;
 136 }
 137
 138 #pragma section(".CRT$XIB", long, read)
 139 __declspec(allocate(".CRT$XIB")) int (*__asan_preinit)() = asan_dll_thunk_init;
 140
 141 static void WINAPI asan_thread_init(void *mod, unsigned long reason,
 142                                     void *reserved) {
 143   if (reason == /*DLL_PROCESS_ATTACH=*/1) asan_dll_thunk_init();
 144 }
 145
 146 #pragma section(".CRT$XLAB", long, read)
 147 __declspec(allocate(".CRT$XLAB")) void (WINAPI *__asan_tls_init)(void *,
 148     unsigned long, void *) = asan_thread_init;
 149
 150 WIN_FORCE_LINK(__asan_dso_reg_hook)
 151
 152 #endif // SANITIZER_DLL_THUNK