lib/asan/asan_win.cc

   1 //===-- asan_win.cc -------------------------------------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file is a part of AddressSanitizer, an address sanity checker.
  11 //
  12 // Windows-specific details.
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "sanitizer_common/sanitizer_platform.h"
  16 #if SANITIZER_WINDOWS
  17 #include <windows.h>
  18
  19 #include <dbghelp.h>
  20 #include <stdlib.h>
  21
  22 #include "asan_interceptors.h"
  23 #include "asan_internal.h"
  24 #include "asan_report.h"
  25 #include "asan_thread.h"
  26 #include "sanitizer_common/sanitizer_libc.h"
  27 #include "sanitizer_common/sanitizer_mutex.h"
  28
  29 extern "C" {
  30   SANITIZER_INTERFACE_ATTRIBUTE
  31   int __asan_should_detect_stack_use_after_return() {
  32     __asan_init();
  33     return __asan_option_detect_stack_use_after_return;
  34   }
  35 }
  36
  37 namespace __asan {
  38
  39 // ---------------------- TSD ---------------- {{{1
  40 static bool tsd_key_inited = false;
  41
  42 static __declspec(thread) void *fake_tsd = 0;
  43
  44 void AsanTSDInit(void (*destructor)(void *tsd)) {
  45   // FIXME: we're ignoring the destructor for now.
  46   tsd_key_inited = true;
  47 }
  48
  49 void *AsanTSDGet() {
  50   CHECK(tsd_key_inited);
  51   return fake_tsd;
  52 }
  53
  54 void AsanTSDSet(void *tsd) {
  55   CHECK(tsd_key_inited);
  56   fake_tsd = tsd;
  57 }
  58
  59 void PlatformTSDDtor(void *tsd) {
  60   AsanThread::TSDDtor(tsd);
  61 }
  62 // ---------------------- Various stuff ---------------- {{{1
  63 void MaybeReexec() {
  64   // No need to re-exec on Windows.
  65 }
  66
  67 void *AsanDoesNotSupportStaticLinkage() {
  68 #if defined(_DEBUG)
  69 #error Please build the runtime with a non-debug CRT: /MD or /MT
  70 #endif
  71   return 0;
  72 }
  73
  74 void AsanCheckDynamicRTPrereqs() { UNIMPLEMENTED(); }
  75
  76 void AsanCheckIncompatibleRT() {}
  77
  78 void AsanPlatformThreadInit() {
  79   // Nothing here for now.
  80 }
  81
  82 void ReadContextStack(void *context, uptr *stack, uptr *ssize) {
  83   UNIMPLEMENTED();
  84 }
  85
  86 void AsanOnSIGSEGV(int, void *siginfo, void *context) {
  87   UNIMPLEMENTED();
  88 }
  89
  90 static LPTOP_LEVEL_EXCEPTION_FILTER default_seh_handler;
  91
  92 long WINAPI SEHHandler(EXCEPTION_POINTERS *info) {
  93   EXCEPTION_RECORD *exception_record = info->ExceptionRecord;
  94   CONTEXT *context = info->ContextRecord;
  95   uptr pc = (uptr)exception_record->ExceptionAddress;
  96 #ifdef _WIN64
  97   uptr bp = (uptr)context->Rbp, sp = (uptr)context->Rsp;
  98 #else
  99   uptr bp = (uptr)context->Ebp, sp = (uptr)context->Esp;
 100 #endif
 101
 102   if (exception_record->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ||
 103       exception_record->ExceptionCode == EXCEPTION_IN_PAGE_ERROR) {
 104     const char *description =
 105         (exception_record->ExceptionCode == EXCEPTION_ACCESS_VIOLATION)
 106             ? "access-violation"
 107             : "in-page-error";
 108     uptr access_addr = exception_record->ExceptionInformation[1];
 109     ReportSIGSEGV(description, pc, sp, bp, context, access_addr);
 110   }
 111
 112   // FIXME: Handle EXCEPTION_STACK_OVERFLOW here.
 113
 114   return default_seh_handler(info);
 115 }
 116
 117 int SetSEHFilter() {
 118   default_seh_handler = SetUnhandledExceptionFilter(SEHHandler);
 119   return 0;
 120 }
 121
 122 // Put a pointer to SetSEHFilter at the end of the global list
 123 // of C initializers, after the default handler is set by the CRT.
 124 // See crt0dat.c in the CRT sources for the details.
 125 #pragma section(".CRT$XIZ", long, read)  // NOLINT
 126 __declspec(allocate(".CRT$XIZ")) int (*__intercept_seh)() = SetSEHFilter;
 127
 128 }  // namespace __asan
 129
 130 #endif  // _WIN32