summaryrefslogtreecommitdiff
path: root/libsanitizer/asan/asan_win.cc
blob: b0028763b11f3c11a1e9aee631a037bf611044bf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
//===-- 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