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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
#include <windows.h>
#include <dbghelp.h>
#include <stdlib.h>
#include "asan_interceptors.h"
#include "asan_internal.h"
#include "asan_report.h"
#include "asan_thread.h"
#include "sanitizer_common/sanitizer_libc.h"
#include "sanitizer_common/sanitizer_mutex.h"
extern "C" {
SANITIZER_INTERFACE_ATTRIBUTE
int __asan_should_detect_stack_use_after_return() {
__asan_init();
return __asan_option_detect_stack_use_after_return;
}
}
namespace __asan {
// ---------------------- TSD ---------------- {{{1
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);
}
// ---------------------- Various stuff ---------------- {{{1
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;
}
void AsanCheckDynamicRTPrereqs() {}
void AsanCheckIncompatibleRT() {}
void AsanPlatformThreadInit() {
// Nothing here for now.
}
void ReadContextStack(void *context, uptr *stack, uptr *ssize) {
UNIMPLEMENTED();
}
void AsanOnSIGSEGV(int, void *siginfo, void *context) {
UNIMPLEMENTED();
}
static LPTOP_LEVEL_EXCEPTION_FILTER default_seh_handler;
static long WINAPI SEHHandler(EXCEPTION_POINTERS *info) {
EXCEPTION_RECORD *exception_record = info->ExceptionRecord;
CONTEXT *context = info->ContextRecord;
uptr pc = (uptr)exception_record->ExceptionAddress;
#ifdef _WIN64
uptr bp = (uptr)context->Rbp, sp = (uptr)context->Rsp;
#else
uptr bp = (uptr)context->Ebp, sp = (uptr)context->Esp;
#endif
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";
uptr access_addr = exception_record->ExceptionInformation[1];
ReportSIGSEGV(description, pc, sp, bp, context, access_addr);
}
// FIXME: Handle EXCEPTION_STACK_OVERFLOW here.
return default_seh_handler(info);
}
// 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$XIZ", long, read) // NOLINT
static __declspec(allocate(".CRT$XIZ"))
int (*__intercept_seh)() = __asan_set_seh_filter;
#endif
} // namespace __asan
#endif // _WIN32
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