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