asan_report.cc revision a89a35acf3004de3e39f1074b8620fb3c423d41f 
1//===-- asan_report.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// This file contains error reporting code.
13//===----------------------------------------------------------------------===//
14#include "asan_flags.h"
15#include "asan_internal.h"
16#include "asan_mapping.h"
17#include "asan_report.h"
18#include "asan_stack.h"
19#include "asan_thread.h"
20#include "sanitizer_common/sanitizer_common.h"
21#include "sanitizer_common/sanitizer_report_decorator.h"
22#include "sanitizer_common/sanitizer_symbolizer.h"
23
24namespace __asan {
25
26// -------------------- User-specified callbacks ----------------- {{{1
27static void (*error_report_callback)(const char*);
28static char *error_message_buffer = 0;
29static uptr error_message_buffer_pos = 0;
30static uptr error_message_buffer_size = 0;
31
32void AppendToErrorMessageBuffer(const char *buffer) {
33  if (error_message_buffer) {
34    uptr length = internal_strlen(buffer);
35    CHECK_GE(error_message_buffer_size, error_message_buffer_pos);
36    uptr remaining = error_message_buffer_size - error_message_buffer_pos;
37    internal_strncpy(error_message_buffer + error_message_buffer_pos,
38                     buffer, remaining);
39    error_message_buffer[error_message_buffer_size - 1] = '\0';
40    // FIXME: reallocate the buffer instead of truncating the message.
41    error_message_buffer_pos += remaining > length ? length : remaining;
42  }
43}
44
45// ---------------------- Decorator ------------------------------ {{{1
46bool PrintsToTtyCached() {
47  static int cached = 0;
48  static bool prints_to_tty;
49  if (!cached) {  // Ok wrt threads since we are printing only from one thread.
50    prints_to_tty = PrintsToTty();
51    cached = 1;
52  }
53  return prints_to_tty;
54}
55class Decorator: private __sanitizer::AnsiColorDecorator {
56 public:
57  Decorator() : __sanitizer::AnsiColorDecorator(PrintsToTtyCached()) { }
58  const char *Warning()    { return Red(); }
59  const char *EndWarning() { return Default(); }
60  const char *Access()     { return Blue(); }
61  const char *EndAccess()  { return Default(); }
62  const char *Location()   { return Green(); }
63  const char *EndLocation() { return Default(); }
64  const char *Allocation()  { return Magenta(); }
65  const char *EndAllocation()  { return Default(); }
66
67  const char *ShadowByte(u8 byte) {
68    switch (byte) {
69      case kAsanHeapLeftRedzoneMagic:
70      case kAsanHeapRightRedzoneMagic:
71        return Red();
72      case kAsanHeapFreeMagic:
73        return Magenta();
74      case kAsanStackLeftRedzoneMagic:
75      case kAsanStackMidRedzoneMagic:
76      case kAsanStackRightRedzoneMagic:
77      case kAsanStackPartialRedzoneMagic:
78        return Red();
79      case kAsanStackAfterReturnMagic:
80        return Magenta();
81      case kAsanInitializationOrderMagic:
82        return Cyan();
83      case kAsanUserPoisonedMemoryMagic:
84        return Blue();
85      case kAsanStackUseAfterScopeMagic:
86        return Magenta();
87      case kAsanGlobalRedzoneMagic:
88        return Red();
89      case kAsanInternalHeapMagic:
90        return Yellow();
91      default:
92        return Default();
93    }
94  }
95  const char *EndShadowByte() { return Default(); }
96};
97
98// ---------------------- Helper functions ----------------------- {{{1
99
100static void PrintShadowByte(const char *before, u8 byte,
101                            const char *after = "\n") {
102  Decorator d;
103  Printf("%s%s%x%x%s%s", before,
104         d.ShadowByte(byte), byte >> 4, byte & 15, d.EndShadowByte(), after);
105}
106
107static void PrintShadowBytes(const char *before, u8 *bytes,
108                             u8 *guilty, uptr n) {
109  Decorator d;
110  if (before)
111    Printf("%s%p:", before, bytes);
112  for (uptr i = 0; i < n; i++) {
113    u8 *p = bytes + i;
114    const char *before = p == guilty ? "[" :
115        p - 1 == guilty ? "" : " ";
116    const char *after = p == guilty ? "]" : "";
117    PrintShadowByte(before, *p, after);
118  }
119  Printf("\n");
120}
121
122static void PrintLegend() {
123  Printf("Shadow byte legend (one shadow byte represents %d "
124         "application bytes):\n", (int)SHADOW_GRANULARITY);
125  PrintShadowByte("  Addressable:           ", 0);
126  Printf("  Partially addressable: ");
127  for (uptr i = 1; i < SHADOW_GRANULARITY; i++)
128    PrintShadowByte("", i, " ");
129  Printf("\n");
130  PrintShadowByte("  Heap left redzone:     ", kAsanHeapLeftRedzoneMagic);
131  PrintShadowByte("  Heap righ redzone:     ", kAsanHeapRightRedzoneMagic);
132  PrintShadowByte("  Freed Heap region:     ", kAsanHeapFreeMagic);
133  PrintShadowByte("  Stack left redzone:    ", kAsanStackLeftRedzoneMagic);
134  PrintShadowByte("  Stack mid redzone:     ", kAsanStackMidRedzoneMagic);
135  PrintShadowByte("  Stack right redzone:   ", kAsanStackRightRedzoneMagic);
136  PrintShadowByte("  Stack partial redzone: ", kAsanStackPartialRedzoneMagic);
137  PrintShadowByte("  Stack after return:    ", kAsanStackAfterReturnMagic);
138  PrintShadowByte("  Stack use after scope: ", kAsanStackUseAfterScopeMagic);
139  PrintShadowByte("  Global redzone:        ", kAsanGlobalRedzoneMagic);
140  PrintShadowByte("  Global init order:     ", kAsanInitializationOrderMagic);
141  PrintShadowByte("  Poisoned by user:      ", kAsanUserPoisonedMemoryMagic);
142  PrintShadowByte("  ASan internal:         ", kAsanInternalHeapMagic);
143}
144
145static void PrintShadowMemoryForAddress(uptr addr) {
146  if (!AddrIsInMem(addr))
147    return;
148  uptr shadow_addr = MemToShadow(addr);
149  const uptr n_bytes_per_row = 16;
150  uptr aligned_shadow = shadow_addr & ~(n_bytes_per_row - 1);
151  Printf("Shadow bytes around the buggy address:\n");
152  for (int i = -5; i <= 5; i++) {
153    const char *prefix = (i == 0) ? "=>" : "  ";
154    PrintShadowBytes(prefix,
155                     (u8*)(aligned_shadow + i * n_bytes_per_row),
156                     (u8*)shadow_addr, n_bytes_per_row);
157  }
158  if (flags()->print_legend)
159    PrintLegend();
160}
161
162static void PrintZoneForPointer(uptr ptr, uptr zone_ptr,
163                                const char *zone_name) {
164  if (zone_ptr) {
165    if (zone_name) {
166      Printf("malloc_zone_from_ptr(%p) = %p, which is %s\n",
167                 ptr, zone_ptr, zone_name);
168    } else {
169      Printf("malloc_zone_from_ptr(%p) = %p, which doesn't have a name\n",
170                 ptr, zone_ptr);
171    }
172  } else {
173    Printf("malloc_zone_from_ptr(%p) = 0\n", ptr);
174  }
175}
176
177// ---------------------- Address Descriptions ------------------- {{{1
178
179static bool IsASCII(unsigned char c) {
180  return /*0x00 <= c &&*/ c <= 0x7F;
181}
182
183// Check if the global is a zero-terminated ASCII string. If so, print it.
184static void PrintGlobalNameIfASCII(const __asan_global &g) {
185  for (uptr p = g.beg; p < g.beg + g.size - 1; p++) {
186    if (!IsASCII(*(unsigned char*)p)) return;
187  }
188  if (*(char*)(g.beg + g.size - 1) != 0) return;
189  Printf("  '%s' is ascii string '%s'\n", g.name, (char*)g.beg);
190}
191
192bool DescribeAddressRelativeToGlobal(uptr addr, uptr size,
193                                     const __asan_global &g) {
194  static const uptr kMinimalDistanceFromAnotherGlobal = 64;
195  if (addr <= g.beg - kMinimalDistanceFromAnotherGlobal) return false;
196  if (addr >= g.beg + g.size_with_redzone) return false;
197  Decorator d;
198  Printf("%s", d.Location());
199  if (addr < g.beg) {
200    Printf("%p is located %zd bytes to the left", (void*)addr, g.beg - addr);
201  } else if (addr + size > g.beg + g.size) {
202    if (addr < g.beg + g.size)
203      addr = g.beg + g.size;
204    Printf("%p is located %zd bytes to the right", (void*)addr,
205           addr - (g.beg + g.size));
206  } else {
207    // Can it happen?
208    Printf("%p is located %zd bytes inside", (void*)addr, addr - g.beg);
209  }
210  Printf(" of global variable '%s' from '%s' (0x%zx) of size %zu\n",
211             g.name, g.module_name, g.beg, g.size);
212  Printf("%s", d.EndLocation());
213  PrintGlobalNameIfASCII(g);
214  return true;
215}
216
217bool DescribeAddressIfShadow(uptr addr) {
218  if (AddrIsInMem(addr))
219    return false;
220  static const char kAddrInShadowReport[] =
221      "Address %p is located in the %s.\n";
222  if (AddrIsInShadowGap(addr)) {
223    Printf(kAddrInShadowReport, addr, "shadow gap area");
224    return true;
225  }
226  if (AddrIsInHighShadow(addr)) {
227    Printf(kAddrInShadowReport, addr, "high shadow area");
228    return true;
229  }
230  if (AddrIsInLowShadow(addr)) {
231    Printf(kAddrInShadowReport, addr, "low shadow area");
232    return true;
233  }
234  CHECK(0 && "Address is not in memory and not in shadow?");
235  return false;
236}
237
238// Return " (thread_name) " or an empty string if the name is empty.
239const char *ThreadNameWithParenthesis(AsanThreadContext *t, char buff[],
240                                      uptr buff_len) {
241  const char *name = t->name;
242  if (name[0] == '\0') return "";
243  buff[0] = 0;
244  internal_strncat(buff, " (", 3);
245  internal_strncat(buff, name, buff_len - 4);
246  internal_strncat(buff, ")", 2);
247  return buff;
248}
249
250const char *ThreadNameWithParenthesis(u32 tid, char buff[],
251                                      uptr buff_len) {
252  if (tid == kInvalidTid) return "";
253  asanThreadRegistry().CheckLocked();
254  AsanThreadContext *t = GetThreadContextByTidLocked(tid);
255  return ThreadNameWithParenthesis(t, buff, buff_len);
256}
257
258bool DescribeAddressIfStack(uptr addr, uptr access_size) {
259  AsanThread *t = FindThreadByStackAddress(addr);
260  if (!t) return false;
261  const sptr kBufSize = 4095;
262  char buf[kBufSize];
263  uptr offset = 0;
264  uptr frame_pc = 0;
265  char tname[128];
266  const char *frame_descr = t->GetFrameNameByAddr(addr, &offset, &frame_pc);
267  // This string is created by the compiler and has the following form:
268  // "n alloc_1 alloc_2 ... alloc_n"
269  // where alloc_i looks like "offset size len ObjectName ".
270  CHECK(frame_descr);
271  Decorator d;
272  Printf("%s", d.Location());
273  Printf("Address %p is located in stack of thread T%d%s "
274         "at offset %zu in frame\n",
275         addr, t->tid(),
276         ThreadNameWithParenthesis(t->tid(), tname, sizeof(tname)),
277         offset);
278  // Now we print the frame where the alloca has happened.
279  // We print this frame as a stack trace with one element.
280  // The symbolizer may print more than one frame if inlining was involved.
281  // The frame numbers may be different than those in the stack trace printed
282  // previously. That's unfortunate, but I have no better solution,
283  // especially given that the alloca may be from entirely different place
284  // (e.g. use-after-scope, or different thread's stack).
285  StackTrace alloca_stack;
286  alloca_stack.trace[0] = frame_pc + 16;
287  alloca_stack.size = 1;
288  Printf("%s", d.EndLocation());
289  PrintStack(&alloca_stack);
290  // Report the number of stack objects.
291  char *p;
292  uptr n_objects = internal_simple_strtoll(frame_descr, &p, 10);
293  CHECK(n_objects > 0);
294  Printf("  This frame has %zu object(s):\n", n_objects);
295  // Report all objects in this frame.
296  for (uptr i = 0; i < n_objects; i++) {
297    uptr beg, size;
298    sptr len;
299    beg  = internal_simple_strtoll(p, &p, 10);
300    size = internal_simple_strtoll(p, &p, 10);
301    len  = internal_simple_strtoll(p, &p, 10);
302    if (beg <= 0 || size <= 0 || len < 0 || *p != ' ') {
303      Printf("AddressSanitizer can't parse the stack frame "
304                 "descriptor: |%s|\n", frame_descr);
305      break;
306    }
307    p++;
308    buf[0] = 0;
309    internal_strncat(buf, p, Min(kBufSize, len));
310    p += len;
311    Printf("    [%zu, %zu) '%s'\n", beg, beg + size, buf);
312  }
313  Printf("HINT: this may be a false positive if your program uses "
314             "some custom stack unwind mechanism or swapcontext\n"
315             "      (longjmp and C++ exceptions *are* supported)\n");
316  DescribeThread(t->context());
317  return true;
318}
319
320static void DescribeAccessToHeapChunk(AsanChunkView chunk, uptr addr,
321                                      uptr access_size) {
322  sptr offset;
323  Decorator d;
324  Printf("%s", d.Location());
325  if (chunk.AddrIsAtLeft(addr, access_size, &offset)) {
326    Printf("%p is located %zd bytes to the left of", (void*)addr, offset);
327  } else if (chunk.AddrIsAtRight(addr, access_size, &offset)) {
328    if (offset < 0) {
329      addr -= offset;
330      offset = 0;
331    }
332    Printf("%p is located %zd bytes to the right of", (void*)addr, offset);
333  } else if (chunk.AddrIsInside(addr, access_size, &offset)) {
334    Printf("%p is located %zd bytes inside of", (void*)addr, offset);
335  } else {
336    Printf("%p is located somewhere around (this is AddressSanitizer bug!)",
337           (void*)addr);
338  }
339  Printf(" %zu-byte region [%p,%p)\n", chunk.UsedSize(),
340         (void*)(chunk.Beg()), (void*)(chunk.End()));
341  Printf("%s", d.EndLocation());
342}
343
344void DescribeHeapAddress(uptr addr, uptr access_size) {
345  AsanChunkView chunk = FindHeapChunkByAddress(addr);
346  if (!chunk.IsValid()) return;
347  DescribeAccessToHeapChunk(chunk, addr, access_size);
348  CHECK(chunk.AllocTid() != kInvalidTid);
349  asanThreadRegistry().CheckLocked();
350  AsanThreadContext *alloc_thread =
351      GetThreadContextByTidLocked(chunk.AllocTid());
352  StackTrace alloc_stack;
353  chunk.GetAllocStack(&alloc_stack);
354  AsanThread *t = GetCurrentThread();
355  CHECK(t);
356  char tname[128];
357  Decorator d;
358  if (chunk.FreeTid() != kInvalidTid) {
359    AsanThreadContext *free_thread =
360        GetThreadContextByTidLocked(chunk.FreeTid());
361    Printf("%sfreed by thread T%d%s here:%s\n", d.Allocation(),
362           free_thread->tid,
363           ThreadNameWithParenthesis(free_thread, tname, sizeof(tname)),
364           d.EndAllocation());
365    StackTrace free_stack;
366    chunk.GetFreeStack(&free_stack);
367    PrintStack(&free_stack);
368    Printf("%spreviously allocated by thread T%d%s here:%s\n",
369           d.Allocation(), alloc_thread->tid,
370           ThreadNameWithParenthesis(alloc_thread, tname, sizeof(tname)),
371           d.EndAllocation());
372    PrintStack(&alloc_stack);
373    DescribeThread(t->context());
374    DescribeThread(free_thread);
375    DescribeThread(alloc_thread);
376  } else {
377    Printf("%sallocated by thread T%d%s here:%s\n", d.Allocation(),
378           alloc_thread->tid,
379           ThreadNameWithParenthesis(alloc_thread, tname, sizeof(tname)),
380           d.EndAllocation());
381    PrintStack(&alloc_stack);
382    DescribeThread(t->context());
383    DescribeThread(alloc_thread);
384  }
385}
386
387void DescribeAddress(uptr addr, uptr access_size) {
388  // Check if this is shadow or shadow gap.
389  if (DescribeAddressIfShadow(addr))
390    return;
391  CHECK(AddrIsInMem(addr));
392  if (DescribeAddressIfGlobal(addr, access_size))
393    return;
394  if (DescribeAddressIfStack(addr, access_size))
395    return;
396  // Assume it is a heap address.
397  DescribeHeapAddress(addr, access_size);
398}
399
400// ------------------- Thread description -------------------- {{{1
401
402void DescribeThread(AsanThreadContext *context) {
403  CHECK(context);
404  asanThreadRegistry().CheckLocked();
405  // No need to announce the main thread.
406  if (context->tid == 0 || context->announced) {
407    return;
408  }
409  context->announced = true;
410  char tname[128];
411  Printf("Thread T%d%s", context->tid,
412         ThreadNameWithParenthesis(context->tid, tname, sizeof(tname)));
413  Printf(" created by T%d%s here:\n",
414         context->parent_tid,
415         ThreadNameWithParenthesis(context->parent_tid,
416                                   tname, sizeof(tname)));
417  PrintStack(&context->stack);
418  // Recursively described parent thread if needed.
419  if (flags()->print_full_thread_history) {
420    AsanThreadContext *parent_context =
421        GetThreadContextByTidLocked(context->parent_tid);
422    DescribeThread(parent_context);
423  }
424}
425
426// -------------------- Different kinds of reports ----------------- {{{1
427
428// Use ScopedInErrorReport to run common actions just before and
429// immediately after printing error report.
430class ScopedInErrorReport {
431 public:
432  ScopedInErrorReport() {
433    static atomic_uint32_t num_calls;
434    static u32 reporting_thread_tid;
435    if (atomic_fetch_add(&num_calls, 1, memory_order_relaxed) != 0) {
436      // Do not print more than one report, otherwise they will mix up.
437      // Error reporting functions shouldn't return at this situation, as
438      // they are defined as no-return.
439      Report("AddressSanitizer: while reporting a bug found another one."
440                 "Ignoring.\n");
441      u32 current_tid = GetCurrentTidOrInvalid();
442      if (current_tid != reporting_thread_tid) {
443        // ASan found two bugs in different threads simultaneously. Sleep
444        // long enough to make sure that the thread which started to print
445        // an error report will finish doing it.
446        SleepForSeconds(Max(100, flags()->sleep_before_dying + 1));
447      }
448      // If we're still not dead for some reason, use raw _exit() instead of
449      // Die() to bypass any additional checks.
450      internal__exit(flags()->exitcode);
451    }
452    ASAN_ON_ERROR();
453    // Make sure the registry is locked while we're printing an error report.
454    // We can lock the registry only here to avoid self-deadlock in case of
455    // recursive reports.
456    asanThreadRegistry().Lock();
457    reporting_thread_tid = GetCurrentTidOrInvalid();
458    Printf("===================================================="
459           "=============\n");
460    if (reporting_thread_tid != kInvalidTid) {
461      // We started reporting an error message. Stop using the fake stack
462      // in case we call an instrumented function from a symbolizer.
463      AsanThread *curr_thread = GetCurrentThread();
464      CHECK(curr_thread);
465      curr_thread->fake_stack().StopUsingFakeStack();
466    }
467  }
468  // Destructor is NORETURN, as functions that report errors are.
469  NORETURN ~ScopedInErrorReport() {
470    // Make sure the current thread is announced.
471    AsanThread *curr_thread = GetCurrentThread();
472    if (curr_thread) {
473      DescribeThread(curr_thread->context());
474    }
475    // Print memory stats.
476    if (flags()->print_stats)
477      __asan_print_accumulated_stats();
478    if (error_report_callback) {
479      error_report_callback(error_message_buffer);
480    }
481    Report("ABORTING\n");
482    Die();
483  }
484};
485
486static void ReportSummary(const char *error_type, StackTrace *stack) {
487  if (!stack->size) return;
488  if (IsSymbolizerAvailable()) {
489    AddressInfo ai;
490    // Currently, we include the first stack frame into the report summary.
491    // Maybe sometimes we need to choose another frame (e.g. skip memcpy/etc).
492    SymbolizeCode(stack->trace[0], &ai, 1);
493    ReportErrorSummary(error_type,
494                       StripPathPrefix(ai.file, flags()->strip_path_prefix),
495                       ai.line, ai.function);
496  }
497  // FIXME: do we need to print anything at all if there is no symbolizer?
498}
499
500void ReportSIGSEGV(uptr pc, uptr sp, uptr bp, uptr addr) {
501  ScopedInErrorReport in_report;
502  Decorator d;
503  Printf("%s", d.Warning());
504  Report("ERROR: AddressSanitizer: SEGV on unknown address %p"
505             " (pc %p sp %p bp %p T%d)\n",
506             (void*)addr, (void*)pc, (void*)sp, (void*)bp,
507             GetCurrentTidOrInvalid());
508  Printf("%s", d.EndWarning());
509  Printf("AddressSanitizer can not provide additional info.\n");
510  GET_STACK_TRACE_FATAL(pc, bp);
511  PrintStack(&stack);
512  ReportSummary("SEGV", &stack);
513}
514
515void ReportDoubleFree(uptr addr, StackTrace *stack) {
516  ScopedInErrorReport in_report;
517  Decorator d;
518  Printf("%s", d.Warning());
519  char tname[128];
520  u32 curr_tid = GetCurrentTidOrInvalid();
521  Report("ERROR: AddressSanitizer: attempting double-free on %p in "
522         "thread T%d%s:\n",
523         addr, curr_tid,
524         ThreadNameWithParenthesis(curr_tid, tname, sizeof(tname)));
525
526  Printf("%s", d.EndWarning());
527  PrintStack(stack);
528  DescribeHeapAddress(addr, 1);
529  ReportSummary("double-free", stack);
530}
531
532void ReportFreeNotMalloced(uptr addr, StackTrace *stack) {
533  ScopedInErrorReport in_report;
534  Decorator d;
535  Printf("%s", d.Warning());
536  char tname[128];
537  u32 curr_tid = GetCurrentTidOrInvalid();
538  Report("ERROR: AddressSanitizer: attempting free on address "
539             "which was not malloc()-ed: %p in thread T%d%s\n", addr,
540         curr_tid, ThreadNameWithParenthesis(curr_tid, tname, sizeof(tname)));
541  Printf("%s", d.EndWarning());
542  PrintStack(stack);
543  DescribeHeapAddress(addr, 1);
544  ReportSummary("bad-free", stack);
545}
546
547void ReportAllocTypeMismatch(uptr addr, StackTrace *stack,
548                             AllocType alloc_type,
549                             AllocType dealloc_type) {
550  static const char *alloc_names[] =
551    {"INVALID", "malloc", "operator new", "operator new []"};
552  static const char *dealloc_names[] =
553    {"INVALID", "free", "operator delete", "operator delete []"};
554  CHECK_NE(alloc_type, dealloc_type);
555  ScopedInErrorReport in_report;
556  Decorator d;
557  Printf("%s", d.Warning());
558  Report("ERROR: AddressSanitizer: alloc-dealloc-mismatch (%s vs %s) on %p\n",
559        alloc_names[alloc_type], dealloc_names[dealloc_type], addr);
560  Printf("%s", d.EndWarning());
561  PrintStack(stack);
562  DescribeHeapAddress(addr, 1);
563  ReportSummary("alloc-dealloc-mismatch", stack);
564  Report("HINT: if you don't care about these warnings you may set "
565         "ASAN_OPTIONS=alloc_dealloc_mismatch=0\n");
566}
567
568void ReportMallocUsableSizeNotOwned(uptr addr, StackTrace *stack) {
569  ScopedInErrorReport in_report;
570  Decorator d;
571  Printf("%s", d.Warning());
572  Report("ERROR: AddressSanitizer: attempting to call "
573             "malloc_usable_size() for pointer which is "
574             "not owned: %p\n", addr);
575  Printf("%s", d.EndWarning());
576  PrintStack(stack);
577  DescribeHeapAddress(addr, 1);
578  ReportSummary("bad-malloc_usable_size", stack);
579}
580
581void ReportAsanGetAllocatedSizeNotOwned(uptr addr, StackTrace *stack) {
582  ScopedInErrorReport in_report;
583  Decorator d;
584  Printf("%s", d.Warning());
585  Report("ERROR: AddressSanitizer: attempting to call "
586             "__asan_get_allocated_size() for pointer which is "
587             "not owned: %p\n", addr);
588  Printf("%s", d.EndWarning());
589  PrintStack(stack);
590  DescribeHeapAddress(addr, 1);
591  ReportSummary("bad-__asan_get_allocated_size", stack);
592}
593
594void ReportStringFunctionMemoryRangesOverlap(
595    const char *function, const char *offset1, uptr length1,
596    const char *offset2, uptr length2, StackTrace *stack) {
597  ScopedInErrorReport in_report;
598  Decorator d;
599  char bug_type[100];
600  internal_snprintf(bug_type, sizeof(bug_type), "%s-param-overlap", function);
601  Printf("%s", d.Warning());
602  Report("ERROR: AddressSanitizer: %s: "
603             "memory ranges [%p,%p) and [%p, %p) overlap\n", \
604             bug_type, offset1, offset1 + length1, offset2, offset2 + length2);
605  Printf("%s", d.EndWarning());
606  PrintStack(stack);
607  DescribeAddress((uptr)offset1, length1);
608  DescribeAddress((uptr)offset2, length2);
609  ReportSummary(bug_type, stack);
610}
611
612// ----------------------- Mac-specific reports ----------------- {{{1
613
614void WarnMacFreeUnallocated(
615    uptr addr, uptr zone_ptr, const char *zone_name, StackTrace *stack) {
616  // Just print a warning here.
617  Printf("free_common(%p) -- attempting to free unallocated memory.\n"
618             "AddressSanitizer is ignoring this error on Mac OS now.\n",
619             addr);
620  PrintZoneForPointer(addr, zone_ptr, zone_name);
621  PrintStack(stack);
622  DescribeHeapAddress(addr, 1);
623}
624
625void ReportMacMzReallocUnknown(
626    uptr addr, uptr zone_ptr, const char *zone_name, StackTrace *stack) {
627  ScopedInErrorReport in_report;
628  Printf("mz_realloc(%p) -- attempting to realloc unallocated memory.\n"
629             "This is an unrecoverable problem, exiting now.\n",
630             addr);
631  PrintZoneForPointer(addr, zone_ptr, zone_name);
632  PrintStack(stack);
633  DescribeHeapAddress(addr, 1);
634}
635
636void ReportMacCfReallocUnknown(
637    uptr addr, uptr zone_ptr, const char *zone_name, StackTrace *stack) {
638  ScopedInErrorReport in_report;
639  Printf("cf_realloc(%p) -- attempting to realloc unallocated memory.\n"
640             "This is an unrecoverable problem, exiting now.\n",
641             addr);
642  PrintZoneForPointer(addr, zone_ptr, zone_name);
643  PrintStack(stack);
644  DescribeHeapAddress(addr, 1);
645}
646
647}  // namespace __asan
648
649// --------------------------- Interface --------------------- {{{1
650using namespace __asan;  // NOLINT
651
652void __asan_report_error(uptr pc, uptr bp, uptr sp,
653                         uptr addr, bool is_write, uptr access_size) {
654  ScopedInErrorReport in_report;
655
656  // Determine the error type.
657  const char *bug_descr = "unknown-crash";
658  if (AddrIsInMem(addr)) {
659    u8 *shadow_addr = (u8*)MemToShadow(addr);
660    // If we are accessing 16 bytes, look at the second shadow byte.
661    if (*shadow_addr == 0 && access_size > SHADOW_GRANULARITY)
662      shadow_addr++;
663    // If we are in the partial right redzone, look at the next shadow byte.
664    if (*shadow_addr > 0 && *shadow_addr < 128)
665      shadow_addr++;
666    switch (*shadow_addr) {
667      case kAsanHeapLeftRedzoneMagic:
668      case kAsanHeapRightRedzoneMagic:
669        bug_descr = "heap-buffer-overflow";
670        break;
671      case kAsanHeapFreeMagic:
672        bug_descr = "heap-use-after-free";
673        break;
674      case kAsanStackLeftRedzoneMagic:
675        bug_descr = "stack-buffer-underflow";
676        break;
677      case kAsanInitializationOrderMagic:
678        bug_descr = "initialization-order-fiasco";
679        break;
680      case kAsanStackMidRedzoneMagic:
681      case kAsanStackRightRedzoneMagic:
682      case kAsanStackPartialRedzoneMagic:
683        bug_descr = "stack-buffer-overflow";
684        break;
685      case kAsanStackAfterReturnMagic:
686        bug_descr = "stack-use-after-return";
687        break;
688      case kAsanUserPoisonedMemoryMagic:
689        bug_descr = "use-after-poison";
690        break;
691      case kAsanStackUseAfterScopeMagic:
692        bug_descr = "stack-use-after-scope";
693        break;
694      case kAsanGlobalRedzoneMagic:
695        bug_descr = "global-buffer-overflow";
696        break;
697    }
698  }
699  Decorator d;
700  Printf("%s", d.Warning());
701  Report("ERROR: AddressSanitizer: %s on address "
702             "%p at pc 0x%zx bp 0x%zx sp 0x%zx\n",
703             bug_descr, (void*)addr, pc, bp, sp);
704  Printf("%s", d.EndWarning());
705
706  u32 curr_tid = GetCurrentTidOrInvalid();
707  char tname[128];
708  Printf("%s%s of size %zu at %p thread T%d%s%s\n",
709         d.Access(),
710         access_size ? (is_write ? "WRITE" : "READ") : "ACCESS",
711         access_size, (void*)addr, curr_tid,
712         ThreadNameWithParenthesis(curr_tid, tname, sizeof(tname)),
713         d.EndAccess());
714
715  GET_STACK_TRACE_FATAL(pc, bp);
716  PrintStack(&stack);
717
718  DescribeAddress(addr, access_size);
719  ReportSummary(bug_descr, &stack);
720  PrintShadowMemoryForAddress(addr);
721}
722
723void NOINLINE __asan_set_error_report_callback(void (*callback)(const char*)) {
724  error_report_callback = callback;
725  if (callback) {
726    error_message_buffer_size = 1 << 16;
727    error_message_buffer =
728        (char*)MmapOrDie(error_message_buffer_size, __FUNCTION__);
729    error_message_buffer_pos = 0;
730  }
731}
732
733void __asan_describe_address(uptr addr) {
734  DescribeAddress(addr, 1);
735}
736
737#if !SANITIZER_SUPPORTS_WEAK_HOOKS
738// Provide default implementation of __asan_on_error that does nothing
739// and may be overriden by user.
740SANITIZER_WEAK_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE NOINLINE
741void __asan_on_error() {}
742#endif
743