352 lines
12 KiB
C++
352 lines
12 KiB
C++
//===-- asan_win.cc -------------------------------------------------------===//
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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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// Windows-specific details.
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//===----------------------------------------------------------------------===//
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#include "sanitizer_common/sanitizer_platform.h"
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#if SANITIZER_WINDOWS
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#include <stdlib.h>
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#include "asan_interceptors.h"
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#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"
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#include "asan_mapping.h"
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#include "sanitizer_common/sanitizer_libc.h"
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#include "sanitizer_common/sanitizer_mutex.h"
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#include "sanitizer_common/sanitizer_win.h"
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#include "sanitizer_common/sanitizer_win_defs.h"
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using namespace __asan; // NOLINT
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extern "C" {
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SANITIZER_INTERFACE_ATTRIBUTE
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int __asan_should_detect_stack_use_after_return() {
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__asan_init();
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return __asan_option_detect_stack_use_after_return;
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}
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SANITIZER_INTERFACE_ATTRIBUTE
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uptr __asan_get_shadow_memory_dynamic_address() {
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__asan_init();
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return __asan_shadow_memory_dynamic_address;
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}
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} // extern "C"
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// ---------------------- Windows-specific interceptors ---------------- {{{
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static LPTOP_LEVEL_EXCEPTION_FILTER default_seh_handler;
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static LPTOP_LEVEL_EXCEPTION_FILTER user_seh_handler;
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extern "C" SANITIZER_INTERFACE_ATTRIBUTE
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long __asan_unhandled_exception_filter(EXCEPTION_POINTERS *info) {
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EXCEPTION_RECORD *exception_record = info->ExceptionRecord;
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CONTEXT *context = info->ContextRecord;
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// FIXME: Handle EXCEPTION_STACK_OVERFLOW here.
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SignalContext sig(exception_record, context);
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ReportDeadlySignal(sig);
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UNREACHABLE("returned from reporting deadly signal");
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}
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// Wrapper SEH Handler. If the exception should be handled by asan, we call
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// __asan_unhandled_exception_filter, otherwise, we execute the user provided
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// exception handler or the default.
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static long WINAPI SEHHandler(EXCEPTION_POINTERS *info) {
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DWORD exception_code = info->ExceptionRecord->ExceptionCode;
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if (__sanitizer::IsHandledDeadlyException(exception_code))
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return __asan_unhandled_exception_filter(info);
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if (user_seh_handler)
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return user_seh_handler(info);
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// Bubble out to the default exception filter.
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if (default_seh_handler)
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return default_seh_handler(info);
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return EXCEPTION_CONTINUE_SEARCH;
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}
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INTERCEPTOR_WINAPI(LPTOP_LEVEL_EXCEPTION_FILTER, SetUnhandledExceptionFilter,
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LPTOP_LEVEL_EXCEPTION_FILTER ExceptionFilter) {
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CHECK(REAL(SetUnhandledExceptionFilter));
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if (ExceptionFilter == &SEHHandler)
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return REAL(SetUnhandledExceptionFilter)(ExceptionFilter);
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// We record the user provided exception handler to be called for all the
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// exceptions unhandled by asan.
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Swap(ExceptionFilter, user_seh_handler);
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return ExceptionFilter;
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}
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INTERCEPTOR_WINAPI(void, RtlRaiseException, EXCEPTION_RECORD *ExceptionRecord) {
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CHECK(REAL(RtlRaiseException));
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// This is a noreturn function, unless it's one of the exceptions raised to
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// communicate with the debugger, such as the one from OutputDebugString.
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if (ExceptionRecord->ExceptionCode != DBG_PRINTEXCEPTION_C)
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__asan_handle_no_return();
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REAL(RtlRaiseException)(ExceptionRecord);
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}
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INTERCEPTOR_WINAPI(void, RaiseException, void *a, void *b, void *c, void *d) {
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CHECK(REAL(RaiseException));
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__asan_handle_no_return();
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REAL(RaiseException)(a, b, c, d);
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}
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#ifdef _WIN64
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INTERCEPTOR_WINAPI(int, __C_specific_handler, void *a, void *b, void *c, void *d) { // NOLINT
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CHECK(REAL(__C_specific_handler));
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__asan_handle_no_return();
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return REAL(__C_specific_handler)(a, b, c, d);
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}
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#else
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INTERCEPTOR(int, _except_handler3, void *a, void *b, void *c, void *d) {
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CHECK(REAL(_except_handler3));
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__asan_handle_no_return();
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return REAL(_except_handler3)(a, b, c, d);
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}
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#if ASAN_DYNAMIC
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// This handler is named differently in -MT and -MD CRTs.
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#define _except_handler4 _except_handler4_common
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#endif
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INTERCEPTOR(int, _except_handler4, void *a, void *b, void *c, void *d) {
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CHECK(REAL(_except_handler4));
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__asan_handle_no_return();
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return REAL(_except_handler4)(a, b, c, d);
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}
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#endif
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static thread_return_t THREAD_CALLING_CONV asan_thread_start(void *arg) {
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AsanThread *t = (AsanThread*)arg;
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SetCurrentThread(t);
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return t->ThreadStart(GetTid(), /* signal_thread_is_registered */ nullptr);
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}
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INTERCEPTOR_WINAPI(DWORD, CreateThread,
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void* security, uptr stack_size,
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DWORD (__stdcall *start_routine)(void*), void* arg,
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DWORD thr_flags, void* tid) {
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// Strict init-order checking is thread-hostile.
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if (flags()->strict_init_order)
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StopInitOrderChecking();
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GET_STACK_TRACE_THREAD;
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// FIXME: The CreateThread interceptor is not the same as a pthread_create
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// one. This is a bandaid fix for PR22025.
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bool detached = false; // FIXME: how can we determine it on Windows?
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u32 current_tid = GetCurrentTidOrInvalid();
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AsanThread *t =
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AsanThread::Create(start_routine, arg, current_tid, &stack, detached);
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return REAL(CreateThread)(security, stack_size,
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asan_thread_start, t, thr_flags, tid);
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}
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// }}}
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namespace __asan {
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void InitializePlatformInterceptors() {
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ASAN_INTERCEPT_FUNC(CreateThread);
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ASAN_INTERCEPT_FUNC(SetUnhandledExceptionFilter);
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#ifdef _WIN64
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ASAN_INTERCEPT_FUNC(__C_specific_handler);
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#else
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ASAN_INTERCEPT_FUNC(_except_handler3);
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ASAN_INTERCEPT_FUNC(_except_handler4);
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#endif
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// Try to intercept kernel32!RaiseException, and if that fails, intercept
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// ntdll!RtlRaiseException instead.
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if (!::__interception::OverrideFunction("RaiseException",
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(uptr)WRAP(RaiseException),
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(uptr *)&REAL(RaiseException))) {
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CHECK(::__interception::OverrideFunction("RtlRaiseException",
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(uptr)WRAP(RtlRaiseException),
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(uptr *)&REAL(RtlRaiseException)));
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}
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}
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void AsanApplyToGlobals(globals_op_fptr op, const void *needle) {
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UNIMPLEMENTED();
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}
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// ---------------------- TSD ---------------- {{{
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static bool tsd_key_inited = false;
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static __declspec(thread) void *fake_tsd = 0;
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void AsanTSDInit(void (*destructor)(void *tsd)) {
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// FIXME: we're ignoring the destructor for now.
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tsd_key_inited = true;
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}
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void *AsanTSDGet() {
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CHECK(tsd_key_inited);
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return fake_tsd;
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}
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void AsanTSDSet(void *tsd) {
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CHECK(tsd_key_inited);
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fake_tsd = tsd;
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}
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void PlatformTSDDtor(void *tsd) {
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AsanThread::TSDDtor(tsd);
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}
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// }}}
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// ---------------------- Various stuff ---------------- {{{
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void *AsanDoesNotSupportStaticLinkage() {
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#if defined(_DEBUG)
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#error Please build the runtime with a non-debug CRT: /MD or /MT
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#endif
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return 0;
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}
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uptr FindDynamicShadowStart() {
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uptr granularity = GetMmapGranularity();
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uptr alignment = 8 * granularity;
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uptr left_padding = granularity;
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uptr space_size = kHighShadowEnd + left_padding;
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uptr shadow_start =
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FindAvailableMemoryRange(space_size, alignment, granularity, nullptr);
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CHECK_NE((uptr)0, shadow_start);
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CHECK(IsAligned(shadow_start, alignment));
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return shadow_start;
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}
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void AsanCheckDynamicRTPrereqs() {}
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void AsanCheckIncompatibleRT() {}
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void ReadContextStack(void *context, uptr *stack, uptr *ssize) {
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UNIMPLEMENTED();
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}
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void AsanOnDeadlySignal(int, void *siginfo, void *context) {
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UNIMPLEMENTED();
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}
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#if SANITIZER_WINDOWS64
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// Exception handler for dealing with shadow memory.
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static LONG CALLBACK
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ShadowExceptionHandler(PEXCEPTION_POINTERS exception_pointers) {
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uptr page_size = GetPageSizeCached();
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// Only handle access violations.
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if (exception_pointers->ExceptionRecord->ExceptionCode !=
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EXCEPTION_ACCESS_VIOLATION) {
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return EXCEPTION_CONTINUE_SEARCH;
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}
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// Only handle access violations that land within the shadow memory.
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uptr addr =
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(uptr)(exception_pointers->ExceptionRecord->ExceptionInformation[1]);
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// Check valid shadow range.
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if (!AddrIsInShadow(addr)) return EXCEPTION_CONTINUE_SEARCH;
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// This is an access violation while trying to read from the shadow. Commit
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// the relevant page and let execution continue.
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// Determine the address of the page that is being accessed.
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uptr page = RoundDownTo(addr, page_size);
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// Query the existing page.
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MEMORY_BASIC_INFORMATION mem_info = {};
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if (::VirtualQuery((LPVOID)page, &mem_info, sizeof(mem_info)) == 0)
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return EXCEPTION_CONTINUE_SEARCH;
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// Commit the page.
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uptr result =
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(uptr)::VirtualAlloc((LPVOID)page, page_size, MEM_COMMIT, PAGE_READWRITE);
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if (result != page) return EXCEPTION_CONTINUE_SEARCH;
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// The page mapping succeeded, so continue execution as usual.
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return EXCEPTION_CONTINUE_EXECUTION;
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}
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#endif
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void InitializePlatformExceptionHandlers() {
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#if SANITIZER_WINDOWS64
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// On Win64, we map memory on demand with access violation handler.
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// Install our exception handler.
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CHECK(AddVectoredExceptionHandler(TRUE, &ShadowExceptionHandler));
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#endif
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}
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bool IsSystemHeapAddress(uptr addr) {
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return ::HeapValidate(GetProcessHeap(), 0, (void*)addr) != FALSE;
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}
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// We want to install our own exception handler (EH) to print helpful reports
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// on access violations and whatnot. Unfortunately, the CRT initializers assume
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// they are run before any user code and drop any previously-installed EHs on
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// the floor, so we can't install our handler inside __asan_init.
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// (See crt0dat.c in the CRT sources for the details)
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//
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// Things get even more complicated with the dynamic runtime, as it finishes its
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// initialization before the .exe module CRT begins to initialize.
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//
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// For the static runtime (-MT), it's enough to put a callback to
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// __asan_set_seh_filter in the last section for C initializers.
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//
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// For the dynamic runtime (-MD), we want link the same
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// asan_dynamic_runtime_thunk.lib to all the modules, thus __asan_set_seh_filter
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// will be called for each instrumented module. This ensures that at least one
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// __asan_set_seh_filter call happens after the .exe module CRT is initialized.
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extern "C" SANITIZER_INTERFACE_ATTRIBUTE
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int __asan_set_seh_filter() {
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// We should only store the previous handler if it's not our own handler in
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// order to avoid loops in the EH chain.
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auto prev_seh_handler = SetUnhandledExceptionFilter(SEHHandler);
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if (prev_seh_handler != &SEHHandler)
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default_seh_handler = prev_seh_handler;
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return 0;
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}
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#if !ASAN_DYNAMIC
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// The CRT runs initializers in this order:
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// - C initializers, from XIA to XIZ
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// - C++ initializers, from XCA to XCZ
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// Prior to 2015, the CRT set the unhandled exception filter at priority XIY,
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// near the end of C initialization. Starting in 2015, it was moved to the
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// beginning of C++ initialization. We set our priority to XCAB to run
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// immediately after the CRT runs. This way, our exception filter is called
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// first and we can delegate to their filter if appropriate.
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#pragma section(".CRT$XCAB", long, read) // NOLINT
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__declspec(allocate(".CRT$XCAB")) int (*__intercept_seh)() =
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__asan_set_seh_filter;
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// Piggyback on the TLS initialization callback directory to initialize asan as
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// early as possible. Initializers in .CRT$XL* are called directly by ntdll,
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// which run before the CRT. Users also add code to .CRT$XLC, so it's important
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// to run our initializers first.
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static void NTAPI asan_thread_init(void *module, DWORD reason, void *reserved) {
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if (reason == DLL_PROCESS_ATTACH) __asan_init();
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}
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#pragma section(".CRT$XLAB", long, read) // NOLINT
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__declspec(allocate(".CRT$XLAB")) void (NTAPI *__asan_tls_init)(void *,
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unsigned long, void *) = asan_thread_init;
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#endif
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WIN_FORCE_LINK(__asan_dso_reg_hook)
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// }}}
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} // namespace __asan
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#endif // SANITIZER_WINDOWS
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