forked from OSchip/llvm-project
98 lines
4.1 KiB
C++
98 lines
4.1 KiB
C++
//===-- asan_win_uar_thunk.cc ---------------------------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file is a part of AddressSanitizer, an address sanity checker.
|
|
//
|
|
// This file defines things that need to be present in the application modules
|
|
// to interact with the ASan DLL runtime correctly and can't be implemented
|
|
// using the default "import library" generated when linking the DLL RTL.
|
|
//
|
|
// This includes:
|
|
// - forwarding the detect_stack_use_after_return runtime option
|
|
// - working around deficiencies of the MD runtime
|
|
// - installing a custom SEH handlerx
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// Only compile this code when buidling asan_dynamic_runtime_thunk.lib
|
|
// Using #ifdef rather than relying on Makefiles etc.
|
|
// simplifies the build procedure.
|
|
#ifdef ASAN_DYNAMIC_RUNTIME_THUNK
|
|
#include <windows.h>
|
|
|
|
// First, declare CRT sections we'll be using in this file
|
|
#pragma section(".CRT$XID", long, read) // NOLINT
|
|
#pragma section(".CRT$XIZ", long, read) // NOLINT
|
|
#pragma section(".CRT$XTW", long, read) // NOLINT
|
|
#pragma section(".CRT$XTY", long, read) // NOLINT
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// Define a copy of __asan_option_detect_stack_use_after_return that should be
|
|
// used when linking an MD runtime with a set of object files on Windows.
|
|
//
|
|
// The ASan MD runtime dllexports '__asan_option_detect_stack_use_after_return',
|
|
// so normally we would just dllimport it. Unfortunately, the dllimport
|
|
// attribute adds __imp_ prefix to the symbol name of a variable.
|
|
// Since in general we don't know if a given TU is going to be used
|
|
// with a MT or MD runtime and we don't want to use ugly __imp_ names on Windows
|
|
// just to work around this issue, let's clone the a variable that is
|
|
// constant after initialization anyways.
|
|
extern "C" {
|
|
__declspec(dllimport) int __asan_should_detect_stack_use_after_return();
|
|
int __asan_option_detect_stack_use_after_return =
|
|
__asan_should_detect_stack_use_after_return();
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// For some reason, the MD CRT doesn't call the C/C++ terminators during on DLL
|
|
// unload or on exit. ASan relies on LLVM global_dtors to call
|
|
// __asan_unregister_globals on these events, which unfortunately doesn't work
|
|
// with the MD runtime, see PR22545 for the details.
|
|
// To work around this, for each DLL we schedule a call to UnregisterGlobals
|
|
// using atexit() that calls a small subset of C terminators
|
|
// where LLVM global_dtors is placed. Fingers crossed, no other C terminators
|
|
// are there.
|
|
extern "C" void __cdecl _initterm(void *a, void *b);
|
|
|
|
namespace {
|
|
__declspec(allocate(".CRT$XTW")) void* before_global_dtors = 0;
|
|
__declspec(allocate(".CRT$XTY")) void* after_global_dtors = 0;
|
|
|
|
void UnregisterGlobals() {
|
|
_initterm(&before_global_dtors, &after_global_dtors);
|
|
}
|
|
|
|
int ScheduleUnregisterGlobals() {
|
|
return atexit(UnregisterGlobals);
|
|
}
|
|
|
|
// We need to call 'atexit(UnregisterGlobals);' as early as possible, but after
|
|
// atexit() is initialized (.CRT$XIC). As this is executed before C++
|
|
// initializers (think ctors for globals), UnregisterGlobals gets executed after
|
|
// dtors for C++ globals.
|
|
__declspec(allocate(".CRT$XID"))
|
|
int (*__asan_schedule_unregister_globals)() = ScheduleUnregisterGlobals;
|
|
|
|
} // namespace
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// ASan SEH handling.
|
|
// We need to set the ASan-specific SEH handler at the end of CRT initialization
|
|
// of each module (see also asan_win.cc).
|
|
extern "C" {
|
|
__declspec(dllimport) int __asan_set_seh_filter();
|
|
static int SetSEHFilter() { return __asan_set_seh_filter(); }
|
|
|
|
// Unfortunately, putting a pointer to __asan_set_seh_filter into
|
|
// __asan_intercept_seh gets optimized out, so we have to use an extra function.
|
|
__declspec(allocate(".CRT$XIZ")) int (*__asan_seh_interceptor)() = SetSEHFilter;
|
|
}
|
|
|
|
#endif // ASAN_DYNAMIC_RUNTIME_THUNK
|