53a81d4d26
This reapplies 8fa66c6ca7 ([asan][windows]
Eliminate the static asan runtime on windows) for a second time.
That PR bounced off the tests because it caused failures in the other
sanitizer runtimes, these have been fixed by only building interception,
sanitizer_common, and asan with /MD, and continuing to build the rest of
the runtimes with /MT. This does mean that any usage of the static
ubsan/fuzzer/etc runtimes will mean you're mixing different runtime
library linkages in the same app, the interception, sanitizer_common,
and asan runtimes are designed for this, however it does result in some
linker warnings.
Additionally, it turns out when building in release-mode with
LLVM_ENABLE_PDBs the build system forced /OPT:ICF. This totally breaks
asan's "new" method of doing "weak" functions on windows, and so
/OPT:NOICF was explicitly added to asan's link flags.
---------
Co-authored-by: Amy Wishnousky <amyw@microsoft.com>
55 lines
2.3 KiB
C++
55 lines
2.3 KiB
C++
//===-- asan_win_dynamic_runtime_thunk.cpp --------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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 for application modules
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// that are dynamic linked with the C Runtime.
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//
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//===----------------------------------------------------------------------===//
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#ifdef SANITIZER_DYNAMIC_RUNTIME_THUNK
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# define WIN32_LEAN_AND_MEAN
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# include <windows.h>
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# include "asan_win_common_runtime_thunk.h"
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# include "sanitizer_common/sanitizer_win_defs.h"
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////////////////////////////////////////////////////////////////////////////////
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// For some reason, the MD CRT doesn't call the C/C++ terminators during on DLL
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// unload or on exit. ASan relies on LLVM global_dtors to call
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// __asan_unregister_globals on these events, which unfortunately doesn't work
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// with the MD runtime, see PR22545 for the details.
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// To work around this, for each DLL we schedule a call to UnregisterGlobals
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// using atexit() that calls a small subset of C terminators
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// where LLVM global_dtors is placed. Fingers crossed, no other C terminators
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// are there.
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extern "C" int __cdecl atexit(void(__cdecl *f)(void));
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extern "C" void __cdecl _initterm(void *a, void *b);
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namespace {
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__declspec(allocate(".CRT$XTW")) void *before_global_dtors = 0;
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__declspec(allocate(".CRT$XTY")) void *after_global_dtors = 0;
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void UnregisterGlobals() {
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_initterm(&before_global_dtors, &after_global_dtors);
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}
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int ScheduleUnregisterGlobals() { return atexit(UnregisterGlobals); }
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} // namespace
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// We need to call 'atexit(UnregisterGlobals);' as early as possible, but after
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// atexit() is initialized (.CRT$XIC). As this is executed before C++
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// initializers (think ctors for globals), UnregisterGlobals gets executed after
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// dtors for C++ globals.
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extern "C" __declspec(allocate(".CRT$XID")) int (
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*__asan_schedule_unregister_globals)() = ScheduleUnregisterGlobals;
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WIN_FORCE_LINK(__asan_schedule_unregister_globals)
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#endif // SANITIZER_DYNAMIC_RUNTIME_THUNK
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