Retro68/gcc/libsanitizer/asan/asan_win.cc

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//===-- asan_win.cc -------------------------------------------------------===//
//
// 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.
//
// Windows-specific details.
//===----------------------------------------------------------------------===//
#include "sanitizer_common/sanitizer_platform.h"
#if SANITIZER_WINDOWS
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
#include <stdlib.h>
#include "asan_interceptors.h"
#include "asan_internal.h"
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#include "asan_report.h"
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#include "asan_stack.h"
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#include "asan_thread.h"
#include "sanitizer_common/sanitizer_libc.h"
#include "sanitizer_common/sanitizer_mutex.h"
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using namespace __asan; // NOLINT
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extern "C" {
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SANITIZER_INTERFACE_ATTRIBUTE
int __asan_should_detect_stack_use_after_return() {
__asan_init();
return __asan_option_detect_stack_use_after_return;
}
// -------------------- A workaround for the abscence of weak symbols ----- {{{
// We don't have a direct equivalent of weak symbols when using MSVC, but we can
// use the /alternatename directive to tell the linker to default a specific
// symbol to a specific value, which works nicely for allocator hooks and
// __asan_default_options().
void __sanitizer_default_malloc_hook(void *ptr, uptr size) { }
void __sanitizer_default_free_hook(void *ptr) { }
const char* __asan_default_default_options() { return ""; }
const char* __asan_default_default_suppressions() { return ""; }
void __asan_default_on_error() {}
#pragma comment(linker, "/alternatename:___sanitizer_malloc_hook=___sanitizer_default_malloc_hook") // NOLINT
#pragma comment(linker, "/alternatename:___sanitizer_free_hook=___sanitizer_default_free_hook") // NOLINT
#pragma comment(linker, "/alternatename:___asan_default_options=___asan_default_default_options") // NOLINT
#pragma comment(linker, "/alternatename:___asan_default_suppressions=___asan_default_default_suppressions") // NOLINT
#pragma comment(linker, "/alternatename:___asan_on_error=___asan_default_on_error") // NOLINT
// }}}
} // extern "C"
// ---------------------- Windows-specific inteceptors ---------------- {{{
INTERCEPTOR_WINAPI(void, RaiseException, void *a, void *b, void *c, void *d) {
CHECK(REAL(RaiseException));
__asan_handle_no_return();
REAL(RaiseException)(a, b, c, d);
}
INTERCEPTOR(int, _except_handler3, void *a, void *b, void *c, void *d) {
CHECK(REAL(_except_handler3));
__asan_handle_no_return();
return REAL(_except_handler3)(a, b, c, d);
}
#if ASAN_DYNAMIC
// This handler is named differently in -MT and -MD CRTs.
#define _except_handler4 _except_handler4_common
#endif
INTERCEPTOR(int, _except_handler4, void *a, void *b, void *c, void *d) {
CHECK(REAL(_except_handler4));
__asan_handle_no_return();
return REAL(_except_handler4)(a, b, c, d);
}
static thread_return_t THREAD_CALLING_CONV asan_thread_start(void *arg) {
AsanThread *t = (AsanThread*)arg;
SetCurrentThread(t);
return t->ThreadStart(GetTid(), /* signal_thread_is_registered */ nullptr);
}
INTERCEPTOR_WINAPI(DWORD, CreateThread,
void* security, uptr stack_size,
DWORD (__stdcall *start_routine)(void*), void* arg,
DWORD thr_flags, void* tid) {
// Strict init-order checking is thread-hostile.
if (flags()->strict_init_order)
StopInitOrderChecking();
GET_STACK_TRACE_THREAD;
// FIXME: The CreateThread interceptor is not the same as a pthread_create
// one. This is a bandaid fix for PR22025.
bool detached = false; // FIXME: how can we determine it on Windows?
u32 current_tid = GetCurrentTidOrInvalid();
AsanThread *t =
AsanThread::Create(start_routine, arg, current_tid, &stack, detached);
return REAL(CreateThread)(security, stack_size,
asan_thread_start, t, thr_flags, tid);
}
namespace {
BlockingMutex mu_for_thread_tracking(LINKER_INITIALIZED);
void EnsureWorkerThreadRegistered() {
// FIXME: GetCurrentThread relies on TSD, which might not play well with
// system thread pools. We might want to use something like reference
// counting to zero out GetCurrentThread() underlying storage when the last
// work item finishes? Or can we disable reclaiming of threads in the pool?
BlockingMutexLock l(&mu_for_thread_tracking);
if (__asan::GetCurrentThread())
return;
AsanThread *t = AsanThread::Create(
/* start_routine */ nullptr, /* arg */ nullptr,
/* parent_tid */ -1, /* stack */ nullptr, /* detached */ true);
t->Init();
asanThreadRegistry().StartThread(t->tid(), 0, 0);
SetCurrentThread(t);
}
} // namespace
INTERCEPTOR_WINAPI(DWORD, NtWaitForWorkViaWorkerFactory, DWORD a, DWORD b) {
// NtWaitForWorkViaWorkerFactory is called from system worker pool threads to
// query work scheduled by BindIoCompletionCallback, QueueUserWorkItem, etc.
// System worker pool threads are created at arbitraty point in time and
// without using CreateThread, so we wrap NtWaitForWorkViaWorkerFactory
// instead and don't register a specific parent_tid/stack.
EnsureWorkerThreadRegistered();
return REAL(NtWaitForWorkViaWorkerFactory)(a, b);
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}
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// }}}
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namespace __asan {
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void InitializePlatformInterceptors() {
ASAN_INTERCEPT_FUNC(CreateThread);
ASAN_INTERCEPT_FUNC(RaiseException);
ASAN_INTERCEPT_FUNC(_except_handler3);
ASAN_INTERCEPT_FUNC(_except_handler4);
// NtWaitForWorkViaWorkerFactory is always linked dynamically.
CHECK(::__interception::OverrideFunction(
"NtWaitForWorkViaWorkerFactory",
(uptr)WRAP(NtWaitForWorkViaWorkerFactory),
(uptr *)&REAL(NtWaitForWorkViaWorkerFactory)));
}
// ---------------------- TSD ---------------- {{{
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static bool tsd_key_inited = false;
static __declspec(thread) void *fake_tsd = 0;
void AsanTSDInit(void (*destructor)(void *tsd)) {
// FIXME: we're ignoring the destructor for now.
tsd_key_inited = true;
}
void *AsanTSDGet() {
CHECK(tsd_key_inited);
return fake_tsd;
}
void AsanTSDSet(void *tsd) {
CHECK(tsd_key_inited);
fake_tsd = tsd;
}
void PlatformTSDDtor(void *tsd) {
AsanThread::TSDDtor(tsd);
}
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// }}}
// ---------------------- Various stuff ---------------- {{{
void DisableReexec() {
// No need to re-exec on Windows.
}
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void MaybeReexec() {
// No need to re-exec on Windows.
}
void *AsanDoesNotSupportStaticLinkage() {
#if defined(_DEBUG)
#error Please build the runtime with a non-debug CRT: /MD or /MT
#endif
return 0;
}
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void AsanCheckDynamicRTPrereqs() {}
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void AsanCheckIncompatibleRT() {}
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void ReadContextStack(void *context, uptr *stack, uptr *ssize) {
UNIMPLEMENTED();
}
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void AsanOnDeadlySignal(int, void *siginfo, void *context) {
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UNIMPLEMENTED();
}
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static LPTOP_LEVEL_EXCEPTION_FILTER default_seh_handler;
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static long WINAPI SEHHandler(EXCEPTION_POINTERS *info) {
EXCEPTION_RECORD *exception_record = info->ExceptionRecord;
CONTEXT *context = info->ContextRecord;
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if (exception_record->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ||
exception_record->ExceptionCode == EXCEPTION_IN_PAGE_ERROR) {
const char *description =
(exception_record->ExceptionCode == EXCEPTION_ACCESS_VIOLATION)
? "access-violation"
: "in-page-error";
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SignalContext sig = SignalContext::Create(exception_record, context);
ReportDeadlySignal(description, sig);
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}
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// FIXME: Handle EXCEPTION_STACK_OVERFLOW here.
return default_seh_handler(info);
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}
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// We want to install our own exception handler (EH) to print helpful reports
// on access violations and whatnot. Unfortunately, the CRT initializers assume
// they are run before any user code and drop any previously-installed EHs on
// the floor, so we can't install our handler inside __asan_init.
// (See crt0dat.c in the CRT sources for the details)
//
// Things get even more complicated with the dynamic runtime, as it finishes its
// initialization before the .exe module CRT begins to initialize.
//
// For the static runtime (-MT), it's enough to put a callback to
// __asan_set_seh_filter in the last section for C initializers.
//
// For the dynamic runtime (-MD), we want link the same
// asan_dynamic_runtime_thunk.lib to all the modules, thus __asan_set_seh_filter
// will be called for each instrumented module. This ensures that at least one
// __asan_set_seh_filter call happens after the .exe module CRT is initialized.
extern "C" SANITIZER_INTERFACE_ATTRIBUTE
int __asan_set_seh_filter() {
// We should only store the previous handler if it's not our own handler in
// order to avoid loops in the EH chain.
auto prev_seh_handler = SetUnhandledExceptionFilter(SEHHandler);
if (prev_seh_handler != &SEHHandler)
default_seh_handler = prev_seh_handler;
return 0;
}
#if !ASAN_DYNAMIC
// Put a pointer to __asan_set_seh_filter at the end of the global list
// of C initializers, after the default EH is set by the CRT.
#pragma section(".CRT$XIZ", long, read) // NOLINT
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__declspec(allocate(".CRT$XIZ"))
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int (*__intercept_seh)() = __asan_set_seh_filter;
#endif
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// }}}
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} // namespace __asan
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#endif // _WIN32