120 lines
4.6 KiB
C++
120 lines
4.6 KiB
C++
//===-- asan_win_uar_thunk.cc ---------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of AddressSanitizer, an address sanity checker.
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//
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// This file defines things that need to be present in the application modules
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// to interact with the ASan DLL runtime correctly and can't be implemented
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// using the default "import library" generated when linking the DLL RTL.
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//
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// This includes:
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// - forwarding the detect_stack_use_after_return runtime option
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// - installing a custom SEH handler
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//
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//===----------------------------------------------------------------------===//
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// Only compile this code when buidling asan_dynamic_runtime_thunk.lib
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// Using #ifdef rather than relying on Makefiles etc.
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// simplifies the build procedure.
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#ifdef ASAN_DYNAMIC_RUNTIME_THUNK
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#include <windows.h>
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#include <psapi.h>
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extern "C" {
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////////////////////////////////////////////////////////////////////////////////
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// Define a copy of __asan_option_detect_stack_use_after_return that should be
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// used when linking an MD runtime with a set of object files on Windows.
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//
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// The ASan MD runtime dllexports '__asan_option_detect_stack_use_after_return',
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// so normally we would just dllimport it. Unfortunately, the dllimport
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// attribute adds __imp_ prefix to the symbol name of a variable.
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// Since in general we don't know if a given TU is going to be used
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// with a MT or MD runtime and we don't want to use ugly __imp_ names on Windows
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// just to work around this issue, let's clone the a variable that is
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// constant after initialization anyways.
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__declspec(dllimport) int __asan_should_detect_stack_use_after_return();
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int __asan_option_detect_stack_use_after_return =
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__asan_should_detect_stack_use_after_return();
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}
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////////////////////////////////////////////////////////////////////////////////
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// For some reason, the MD CRT doesn't call the C/C++ terminators as MT does.
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// To work around this, for each DLL we schedule a call to
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// UnregisterGlobalsInRange atexit() specifying the address range of the DLL
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// image to unregister globals in that range. We don't do the same
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// for the main module (.exe) as the asan_globals.cc allocator is destroyed
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// by the time UnregisterGlobalsInRange is executed.
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// See PR22545 for the details.
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namespace __asan {
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__declspec(dllimport)
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void UnregisterGlobalsInRange(void *beg, void *end);
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}
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namespace {
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void *this_module_base, *this_module_end;
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void UnregisterGlobals() {
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__asan::UnregisterGlobalsInRange(this_module_base, this_module_end);
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}
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int ScheduleUnregisterGlobals() {
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HMODULE this_module = 0;
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// Increments the reference counter of the DLL module, so need to call
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// FreeLibrary later.
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if (!GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS,
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(LPCTSTR)&UnregisterGlobals, &this_module))
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return 1;
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// Skip the main module.
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if (this_module == GetModuleHandle(0))
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return 0;
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MODULEINFO mi;
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bool success =
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GetModuleInformation(GetCurrentProcess(), this_module, &mi, sizeof(mi));
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if (!FreeLibrary(this_module))
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return 2;
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if (!success)
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return 3;
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this_module_base = mi.lpBaseOfDll;
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this_module_end = (char*)mi.lpBaseOfDll + mi.SizeOfImage;
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return atexit(UnregisterGlobals);
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}
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} // namespace
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///////////////////////////////////////////////////////////////////////////////
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// ASan SEH handling.
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extern "C" __declspec(dllimport) int __asan_set_seh_filter();
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static int SetSEHFilter() { return __asan_set_seh_filter(); }
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///////////////////////////////////////////////////////////////////////////////
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// We schedule some work at start-up by placing callbacks to our code to the
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// list of CRT C initializers.
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//
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// First, declare sections we'll be using:
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#pragma section(".CRT$XID", long, read) // NOLINT
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#pragma section(".CRT$XIZ", long, read) // NOLINT
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// We need to call 'atexit(UnregisterGlobals);' after atexit() is initialized
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// (.CRT$XIC) but before the C++ constructors (.CRT$XCA).
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__declspec(allocate(".CRT$XID"))
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static int (*__asan_schedule_unregister_globals)() = ScheduleUnregisterGlobals;
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// We need to set the ASan-specific SEH handler at the end of CRT initialization
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// of each module (see also asan_win.cc).
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//
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// Unfortunately, putting a pointer to __asan_set_seh_filter into
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// __asan_intercept_seh gets optimized out, so we have to use an extra function.
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extern "C" __declspec(allocate(".CRT$XIZ"))
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int (*__asan_seh_interceptor)() = SetSEHFilter;
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#endif // ASAN_DYNAMIC_RUNTIME_THUNK
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