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 "asan_mapping.h"
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#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;
}
SANITIZER_INTERFACE_ATTRIBUTE
uptr __asan_get_shadow_memory_dynamic_address() {
__asan_init();
return __asan_shadow_memory_dynamic_address;
}
// -------------------- A workaround for the absence of weak symbols ----- {{{
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// 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() {}
// 64-bit msvc will not prepend an underscore for symbols.
#ifdef _WIN64
#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
#else
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#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
#endif
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// }}}
} // extern "C"
// ---------------------- Windows-specific interceptors ---------------- {{{
INTERCEPTOR_WINAPI(void, RtlRaiseException, EXCEPTION_RECORD *ExceptionRecord) {
CHECK(REAL(RtlRaiseException));
// This is a noreturn function, unless it's one of the exceptions raised to
// communicate with the debugger, such as the one from OutputDebugString.
if (ExceptionRecord->ExceptionCode != DBG_PRINTEXCEPTION_C)
__asan_handle_no_return();
REAL(RtlRaiseException)(ExceptionRecord);
}
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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);
}
#ifdef _WIN64
INTERCEPTOR_WINAPI(int, __C_specific_handler, void *a, void *b, void *c, void *d) { // NOLINT
CHECK(REAL(__C_specific_handler));
__asan_handle_no_return();
return REAL(__C_specific_handler)(a, b, c, d);
}
#else
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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);
}
#endif
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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);
}
// }}}
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namespace __asan {
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void InitializePlatformInterceptors() {
ASAN_INTERCEPT_FUNC(CreateThread);
#ifdef _WIN64
ASAN_INTERCEPT_FUNC(__C_specific_handler);
#else
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ASAN_INTERCEPT_FUNC(_except_handler3);
ASAN_INTERCEPT_FUNC(_except_handler4);
#endif
// Try to intercept kernel32!RaiseException, and if that fails, intercept
// ntdll!RtlRaiseException instead.
if (!::__interception::OverrideFunction("RaiseException",
(uptr)WRAP(RaiseException),
(uptr *)&REAL(RaiseException))) {
CHECK(::__interception::OverrideFunction("RtlRaiseException",
(uptr)WRAP(RtlRaiseException),
(uptr *)&REAL(RtlRaiseException)));
}
}
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void AsanApplyToGlobals(globals_op_fptr op, const void *needle) {
UNIMPLEMENTED();
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}
// ---------------------- 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 ---------------- {{{
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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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#if SANITIZER_WINDOWS64
// Exception handler for dealing with shadow memory.
static LONG CALLBACK
ShadowExceptionHandler(PEXCEPTION_POINTERS exception_pointers) {
uptr page_size = GetPageSizeCached();
// Only handle access violations.
if (exception_pointers->ExceptionRecord->ExceptionCode !=
EXCEPTION_ACCESS_VIOLATION) {
return EXCEPTION_CONTINUE_SEARCH;
}
// Only handle access violations that land within the shadow memory.
uptr addr =
(uptr)(exception_pointers->ExceptionRecord->ExceptionInformation[1]);
// Check valid shadow range.
if (!AddrIsInShadow(addr)) return EXCEPTION_CONTINUE_SEARCH;
// This is an access violation while trying to read from the shadow. Commit
// the relevant page and let execution continue.
// Determine the address of the page that is being accessed.
uptr page = RoundDownTo(addr, page_size);
// Query the existing page.
MEMORY_BASIC_INFORMATION mem_info = {};
if (::VirtualQuery((LPVOID)page, &mem_info, sizeof(mem_info)) == 0)
return EXCEPTION_CONTINUE_SEARCH;
// Commit the page.
uptr result =
(uptr)::VirtualAlloc((LPVOID)page, page_size, MEM_COMMIT, PAGE_READWRITE);
if (result != page) return EXCEPTION_CONTINUE_SEARCH;
// The page mapping succeeded, so continue execution as usual.
return EXCEPTION_CONTINUE_EXECUTION;
}
#endif
void InitializePlatformExceptionHandlers() {
#if SANITIZER_WINDOWS64
// On Win64, we map memory on demand with access violation handler.
// Install our exception handler.
CHECK(AddVectoredExceptionHandler(TRUE, &ShadowExceptionHandler));
#endif
}
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static LPTOP_LEVEL_EXCEPTION_FILTER default_seh_handler;
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// Check based on flags if we should report this exception.
static bool ShouldReportDeadlyException(unsigned code) {
switch (code) {
case EXCEPTION_ACCESS_VIOLATION:
case EXCEPTION_IN_PAGE_ERROR:
return common_flags()->handle_segv;
case EXCEPTION_BREAKPOINT:
case EXCEPTION_ILLEGAL_INSTRUCTION: {
return common_flags()->handle_sigill;
}
}
return false;
}
// Return the textual name for this exception.
const char *DescribeSignalOrException(int signo) {
unsigned code = signo;
// Get the string description of the exception if this is a known deadly
// exception.
switch (code) {
case EXCEPTION_ACCESS_VIOLATION:
return "access-violation";
case EXCEPTION_IN_PAGE_ERROR:
return "in-page-error";
case EXCEPTION_BREAKPOINT:
return "breakpoint";
case EXCEPTION_ILLEGAL_INSTRUCTION:
return "illegal-instruction";
}
return nullptr;
}
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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 (ShouldReportDeadlyException(exception_record->ExceptionCode)) {
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SignalContext sig = SignalContext::Create(exception_record, context);
ReportDeadlySignal(exception_record->ExceptionCode, 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
// The CRT runs initializers in this order:
// - C initializers, from XIA to XIZ
// - C++ initializers, from XCA to XCZ
// Prior to 2015, the CRT set the unhandled exception filter at priority XIY,
// near the end of C initialization. Starting in 2015, it was moved to the
// beginning of C++ initialization. We set our priority to XCAB to run
// immediately after the CRT runs. This way, our exception filter is called
// first and we can delegate to their filter if appropriate.
#pragma section(".CRT$XCAB", long, read) // NOLINT
__declspec(allocate(".CRT$XCAB"))
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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