asan_report.cc revision 5e97ba38b00eb843a55189bb913b445cbe620894
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_flags.h" 22#include "sanitizer_common/sanitizer_report_decorator.h" 23#include "sanitizer_common/sanitizer_symbolizer.h" 24 25namespace __asan { 26 27// -------------------- User-specified callbacks ----------------- {{{1 28static void (*error_report_callback)(const char*); 29static char *error_message_buffer = 0; 30static uptr error_message_buffer_pos = 0; 31static uptr error_message_buffer_size = 0; 32 33void 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 47bool 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} 56class 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 101static 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 108static 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 123static 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 (u8 i = 1; i < SHADOW_GRANULARITY; i++) 129 PrintShadowByte("", i, " "); 130 Printf("\n"); 131 PrintShadowByte(" Heap left redzone: ", kAsanHeapLeftRedzoneMagic); 132 PrintShadowByte(" Heap right 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 146static 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 163static 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 180static bool IsASCII(unsigned char c) { 181 return /*0x00 <= c &&*/ c <= 0x7F; 182} 183 184static const char *MaybeDemangleGlobalName(const char *name) { 185 // We can spoil names of globals with C linkage, so use an heuristic 186 // approach to check if the name should be demangled. 187 return (name[0] == '_' && name[1] == 'Z') ? Demangle(name) : name; 188} 189 190// Check if the global is a zero-terminated ASCII string. If so, print it. 191static void PrintGlobalNameIfASCII(const __asan_global &g) { 192 for (uptr p = g.beg; p < g.beg + g.size - 1; p++) { 193 unsigned char c = *(unsigned char*)p; 194 if (c == '\0' || !IsASCII(c)) return; 195 } 196 if (*(char*)(g.beg + g.size - 1) != '\0') return; 197 Printf(" '%s' is ascii string '%s'\n", 198 MaybeDemangleGlobalName(g.name), (char*)g.beg); 199} 200 201bool DescribeAddressRelativeToGlobal(uptr addr, uptr size, 202 const __asan_global &g) { 203 static const uptr kMinimalDistanceFromAnotherGlobal = 64; 204 if (addr <= g.beg - kMinimalDistanceFromAnotherGlobal) return false; 205 if (addr >= g.beg + g.size_with_redzone) return false; 206 Decorator d; 207 Printf("%s", d.Location()); 208 if (addr < g.beg) { 209 Printf("%p is located %zd bytes to the left", (void*)addr, g.beg - addr); 210 } else if (addr + size > g.beg + g.size) { 211 if (addr < g.beg + g.size) 212 addr = g.beg + g.size; 213 Printf("%p is located %zd bytes to the right", (void*)addr, 214 addr - (g.beg + g.size)); 215 } else { 216 // Can it happen? 217 Printf("%p is located %zd bytes inside", (void*)addr, addr - g.beg); 218 } 219 Printf(" of global variable '%s' from '%s' (0x%zx) of size %zu\n", 220 MaybeDemangleGlobalName(g.name), g.module_name, g.beg, g.size); 221 Printf("%s", d.EndLocation()); 222 PrintGlobalNameIfASCII(g); 223 return true; 224} 225 226bool DescribeAddressIfShadow(uptr addr) { 227 if (AddrIsInMem(addr)) 228 return false; 229 static const char kAddrInShadowReport[] = 230 "Address %p is located in the %s.\n"; 231 if (AddrIsInShadowGap(addr)) { 232 Printf(kAddrInShadowReport, addr, "shadow gap area"); 233 return true; 234 } 235 if (AddrIsInHighShadow(addr)) { 236 Printf(kAddrInShadowReport, addr, "high shadow area"); 237 return true; 238 } 239 if (AddrIsInLowShadow(addr)) { 240 Printf(kAddrInShadowReport, addr, "low shadow area"); 241 return true; 242 } 243 CHECK(0 && "Address is not in memory and not in shadow?"); 244 return false; 245} 246 247// Return " (thread_name) " or an empty string if the name is empty. 248const char *ThreadNameWithParenthesis(AsanThreadContext *t, char buff[], 249 uptr buff_len) { 250 const char *name = t->name; 251 if (name[0] == '\0') return ""; 252 buff[0] = 0; 253 internal_strncat(buff, " (", 3); 254 internal_strncat(buff, name, buff_len - 4); 255 internal_strncat(buff, ")", 2); 256 return buff; 257} 258 259const char *ThreadNameWithParenthesis(u32 tid, char buff[], 260 uptr buff_len) { 261 if (tid == kInvalidTid) return ""; 262 asanThreadRegistry().CheckLocked(); 263 AsanThreadContext *t = GetThreadContextByTidLocked(tid); 264 return ThreadNameWithParenthesis(t, buff, buff_len); 265} 266 267bool DescribeAddressIfStack(uptr addr, uptr access_size) { 268 AsanThread *t = FindThreadByStackAddress(addr); 269 if (!t) return false; 270 const s64 kBufSize = 4095; 271 char buf[kBufSize]; 272 uptr offset = 0; 273 uptr frame_pc = 0; 274 char tname[128]; 275 const char *frame_descr = t->GetFrameNameByAddr(addr, &offset, &frame_pc); 276 277#ifdef __powerpc64__ 278 // On PowerPC64, the address of a function actually points to a 279 // three-doubleword data structure with the first field containing 280 // the address of the function's code. 281 frame_pc = *reinterpret_cast<uptr *>(frame_pc); 282#endif 283 284 // This string is created by the compiler and has the following form: 285 // "n alloc_1 alloc_2 ... alloc_n" 286 // where alloc_i looks like "offset size len ObjectName ". 287 CHECK(frame_descr); 288 Decorator d; 289 Printf("%s", d.Location()); 290 Printf("Address %p is located in stack of thread T%d%s " 291 "at offset %zu in frame\n", 292 addr, t->tid(), 293 ThreadNameWithParenthesis(t->tid(), tname, sizeof(tname)), 294 offset); 295 // Now we print the frame where the alloca has happened. 296 // We print this frame as a stack trace with one element. 297 // The symbolizer may print more than one frame if inlining was involved. 298 // The frame numbers may be different than those in the stack trace printed 299 // previously. That's unfortunate, but I have no better solution, 300 // especially given that the alloca may be from entirely different place 301 // (e.g. use-after-scope, or different thread's stack). 302 StackTrace alloca_stack; 303 alloca_stack.trace[0] = frame_pc + 16; 304 alloca_stack.size = 1; 305 Printf("%s", d.EndLocation()); 306 PrintStack(&alloca_stack); 307 // Report the number of stack objects. 308 char *p; 309 s64 n_objects = internal_simple_strtoll(frame_descr, &p, 10); 310 CHECK_GT(n_objects, 0); 311 Printf(" This frame has %zu object(s):\n", n_objects); 312 // Report all objects in this frame. 313 for (s64 i = 0; i < n_objects; i++) { 314 s64 beg, size; 315 s64 len; 316 beg = internal_simple_strtoll(p, &p, 10); 317 size = internal_simple_strtoll(p, &p, 10); 318 len = internal_simple_strtoll(p, &p, 10); 319 if (beg <= 0 || size <= 0 || len < 0 || *p != ' ') { 320 Printf("AddressSanitizer can't parse the stack frame " 321 "descriptor: |%s|\n", frame_descr); 322 break; 323 } 324 p++; 325 buf[0] = 0; 326 internal_strncat(buf, p, static_cast<uptr>(Min(kBufSize, len))); 327 p += len; 328 Printf(" [%lld, %lld) '%s'\n", beg, beg + size, buf); 329 } 330 Printf("HINT: this may be a false positive if your program uses " 331 "some custom stack unwind mechanism or swapcontext\n" 332 " (longjmp and C++ exceptions *are* supported)\n"); 333 DescribeThread(t->context()); 334 return true; 335} 336 337static void DescribeAccessToHeapChunk(AsanChunkView chunk, uptr addr, 338 uptr access_size) { 339 sptr offset; 340 Decorator d; 341 Printf("%s", d.Location()); 342 if (chunk.AddrIsAtLeft(addr, access_size, &offset)) { 343 Printf("%p is located %zd bytes to the left of", (void*)addr, offset); 344 } else if (chunk.AddrIsAtRight(addr, access_size, &offset)) { 345 if (offset < 0) { 346 addr -= offset; 347 offset = 0; 348 } 349 Printf("%p is located %zd bytes to the right of", (void*)addr, offset); 350 } else if (chunk.AddrIsInside(addr, access_size, &offset)) { 351 Printf("%p is located %zd bytes inside of", (void*)addr, offset); 352 } else { 353 Printf("%p is located somewhere around (this is AddressSanitizer bug!)", 354 (void*)addr); 355 } 356 Printf(" %zu-byte region [%p,%p)\n", chunk.UsedSize(), 357 (void*)(chunk.Beg()), (void*)(chunk.End())); 358 Printf("%s", d.EndLocation()); 359} 360 361void DescribeHeapAddress(uptr addr, uptr access_size) { 362 AsanChunkView chunk = FindHeapChunkByAddress(addr); 363 if (!chunk.IsValid()) return; 364 DescribeAccessToHeapChunk(chunk, addr, access_size); 365 CHECK(chunk.AllocTid() != kInvalidTid); 366 asanThreadRegistry().CheckLocked(); 367 AsanThreadContext *alloc_thread = 368 GetThreadContextByTidLocked(chunk.AllocTid()); 369 StackTrace alloc_stack; 370 chunk.GetAllocStack(&alloc_stack); 371 AsanThread *t = GetCurrentThread(); 372 CHECK(t); 373 char tname[128]; 374 Decorator d; 375 if (chunk.FreeTid() != kInvalidTid) { 376 AsanThreadContext *free_thread = 377 GetThreadContextByTidLocked(chunk.FreeTid()); 378 Printf("%sfreed by thread T%d%s here:%s\n", d.Allocation(), 379 free_thread->tid, 380 ThreadNameWithParenthesis(free_thread, tname, sizeof(tname)), 381 d.EndAllocation()); 382 StackTrace free_stack; 383 chunk.GetFreeStack(&free_stack); 384 PrintStack(&free_stack); 385 Printf("%spreviously allocated by thread T%d%s here:%s\n", 386 d.Allocation(), alloc_thread->tid, 387 ThreadNameWithParenthesis(alloc_thread, tname, sizeof(tname)), 388 d.EndAllocation()); 389 PrintStack(&alloc_stack); 390 DescribeThread(t->context()); 391 DescribeThread(free_thread); 392 DescribeThread(alloc_thread); 393 } else { 394 Printf("%sallocated by thread T%d%s here:%s\n", d.Allocation(), 395 alloc_thread->tid, 396 ThreadNameWithParenthesis(alloc_thread, tname, sizeof(tname)), 397 d.EndAllocation()); 398 PrintStack(&alloc_stack); 399 DescribeThread(t->context()); 400 DescribeThread(alloc_thread); 401 } 402} 403 404void DescribeAddress(uptr addr, uptr access_size) { 405 // Check if this is shadow or shadow gap. 406 if (DescribeAddressIfShadow(addr)) 407 return; 408 CHECK(AddrIsInMem(addr)); 409 if (DescribeAddressIfGlobal(addr, access_size)) 410 return; 411 if (DescribeAddressIfStack(addr, access_size)) 412 return; 413 // Assume it is a heap address. 414 DescribeHeapAddress(addr, access_size); 415} 416 417// ------------------- Thread description -------------------- {{{1 418 419void DescribeThread(AsanThreadContext *context) { 420 CHECK(context); 421 asanThreadRegistry().CheckLocked(); 422 // No need to announce the main thread. 423 if (context->tid == 0 || context->announced) { 424 return; 425 } 426 context->announced = true; 427 char tname[128]; 428 Printf("Thread T%d%s", context->tid, 429 ThreadNameWithParenthesis(context->tid, tname, sizeof(tname))); 430 Printf(" created by T%d%s here:\n", 431 context->parent_tid, 432 ThreadNameWithParenthesis(context->parent_tid, 433 tname, sizeof(tname))); 434 PrintStack(&context->stack); 435 // Recursively described parent thread if needed. 436 if (flags()->print_full_thread_history) { 437 AsanThreadContext *parent_context = 438 GetThreadContextByTidLocked(context->parent_tid); 439 DescribeThread(parent_context); 440 } 441} 442 443// -------------------- Different kinds of reports ----------------- {{{1 444 445// Use ScopedInErrorReport to run common actions just before and 446// immediately after printing error report. 447class ScopedInErrorReport { 448 public: 449 ScopedInErrorReport() { 450 static atomic_uint32_t num_calls; 451 static u32 reporting_thread_tid; 452 if (atomic_fetch_add(&num_calls, 1, memory_order_relaxed) != 0) { 453 // Do not print more than one report, otherwise they will mix up. 454 // Error reporting functions shouldn't return at this situation, as 455 // they are defined as no-return. 456 Report("AddressSanitizer: while reporting a bug found another one." 457 "Ignoring.\n"); 458 u32 current_tid = GetCurrentTidOrInvalid(); 459 if (current_tid != reporting_thread_tid) { 460 // ASan found two bugs in different threads simultaneously. Sleep 461 // long enough to make sure that the thread which started to print 462 // an error report will finish doing it. 463 SleepForSeconds(Max(100, flags()->sleep_before_dying + 1)); 464 } 465 // If we're still not dead for some reason, use raw _exit() instead of 466 // Die() to bypass any additional checks. 467 internal__exit(flags()->exitcode); 468 } 469 ASAN_ON_ERROR(); 470 // Make sure the registry and sanitizer report mutexes are locked while 471 // we're printing an error report. 472 // We can lock them only here to avoid self-deadlock in case of 473 // recursive reports. 474 asanThreadRegistry().Lock(); 475 CommonSanitizerReportMutex.Lock(); 476 reporting_thread_tid = GetCurrentTidOrInvalid(); 477 Printf("====================================================" 478 "=============\n"); 479 if (reporting_thread_tid != kInvalidTid) { 480 // We started reporting an error message. Stop using the fake stack 481 // in case we call an instrumented function from a symbolizer. 482 AsanThread *curr_thread = GetCurrentThread(); 483 CHECK(curr_thread); 484 curr_thread->fake_stack().StopUsingFakeStack(); 485 } 486 } 487 // Destructor is NORETURN, as functions that report errors are. 488 NORETURN ~ScopedInErrorReport() { 489 // Make sure the current thread is announced. 490 AsanThread *curr_thread = GetCurrentThread(); 491 if (curr_thread) { 492 DescribeThread(curr_thread->context()); 493 } 494 // Print memory stats. 495 if (flags()->print_stats) 496 __asan_print_accumulated_stats(); 497 if (error_report_callback) { 498 error_report_callback(error_message_buffer); 499 } 500 Report("ABORTING\n"); 501 Die(); 502 } 503}; 504 505static void ReportSummary(const char *error_type, StackTrace *stack) { 506 if (!stack->size) return; 507 if (IsSymbolizerAvailable()) { 508 AddressInfo ai; 509 // Currently, we include the first stack frame into the report summary. 510 // Maybe sometimes we need to choose another frame (e.g. skip memcpy/etc). 511 uptr pc = StackTrace::GetPreviousInstructionPc(stack->trace[0]); 512 SymbolizeCode(pc, &ai, 1); 513 ReportErrorSummary(error_type, 514 StripPathPrefix(ai.file, 515 common_flags()->strip_path_prefix), 516 ai.line, ai.function); 517 } 518 // FIXME: do we need to print anything at all if there is no symbolizer? 519} 520 521void ReportSIGSEGV(uptr pc, uptr sp, uptr bp, uptr addr) { 522 ScopedInErrorReport in_report; 523 Decorator d; 524 Printf("%s", d.Warning()); 525 Report("ERROR: AddressSanitizer: SEGV on unknown address %p" 526 " (pc %p sp %p bp %p T%d)\n", 527 (void*)addr, (void*)pc, (void*)sp, (void*)bp, 528 GetCurrentTidOrInvalid()); 529 Printf("%s", d.EndWarning()); 530 Printf("AddressSanitizer can not provide additional info.\n"); 531 GET_STACK_TRACE_FATAL(pc, bp); 532 PrintStack(&stack); 533 ReportSummary("SEGV", &stack); 534} 535 536void ReportDoubleFree(uptr addr, StackTrace *stack) { 537 ScopedInErrorReport in_report; 538 Decorator d; 539 Printf("%s", d.Warning()); 540 char tname[128]; 541 u32 curr_tid = GetCurrentTidOrInvalid(); 542 Report("ERROR: AddressSanitizer: attempting double-free on %p in " 543 "thread T%d%s:\n", 544 addr, curr_tid, 545 ThreadNameWithParenthesis(curr_tid, tname, sizeof(tname))); 546 547 Printf("%s", d.EndWarning()); 548 PrintStack(stack); 549 DescribeHeapAddress(addr, 1); 550 ReportSummary("double-free", stack); 551} 552 553void ReportFreeNotMalloced(uptr addr, StackTrace *stack) { 554 ScopedInErrorReport in_report; 555 Decorator d; 556 Printf("%s", d.Warning()); 557 char tname[128]; 558 u32 curr_tid = GetCurrentTidOrInvalid(); 559 Report("ERROR: AddressSanitizer: attempting free on address " 560 "which was not malloc()-ed: %p in thread T%d%s\n", addr, 561 curr_tid, ThreadNameWithParenthesis(curr_tid, tname, sizeof(tname))); 562 Printf("%s", d.EndWarning()); 563 PrintStack(stack); 564 DescribeHeapAddress(addr, 1); 565 ReportSummary("bad-free", stack); 566} 567 568void ReportAllocTypeMismatch(uptr addr, StackTrace *stack, 569 AllocType alloc_type, 570 AllocType dealloc_type) { 571 static const char *alloc_names[] = 572 {"INVALID", "malloc", "operator new", "operator new []"}; 573 static const char *dealloc_names[] = 574 {"INVALID", "free", "operator delete", "operator delete []"}; 575 CHECK_NE(alloc_type, dealloc_type); 576 ScopedInErrorReport in_report; 577 Decorator d; 578 Printf("%s", d.Warning()); 579 Report("ERROR: AddressSanitizer: alloc-dealloc-mismatch (%s vs %s) on %p\n", 580 alloc_names[alloc_type], dealloc_names[dealloc_type], addr); 581 Printf("%s", d.EndWarning()); 582 PrintStack(stack); 583 DescribeHeapAddress(addr, 1); 584 ReportSummary("alloc-dealloc-mismatch", stack); 585 Report("HINT: if you don't care about these warnings you may set " 586 "ASAN_OPTIONS=alloc_dealloc_mismatch=0\n"); 587} 588 589void ReportMallocUsableSizeNotOwned(uptr addr, StackTrace *stack) { 590 ScopedInErrorReport in_report; 591 Decorator d; 592 Printf("%s", d.Warning()); 593 Report("ERROR: AddressSanitizer: attempting to call " 594 "malloc_usable_size() for pointer which is " 595 "not owned: %p\n", addr); 596 Printf("%s", d.EndWarning()); 597 PrintStack(stack); 598 DescribeHeapAddress(addr, 1); 599 ReportSummary("bad-malloc_usable_size", stack); 600} 601 602void ReportAsanGetAllocatedSizeNotOwned(uptr addr, StackTrace *stack) { 603 ScopedInErrorReport in_report; 604 Decorator d; 605 Printf("%s", d.Warning()); 606 Report("ERROR: AddressSanitizer: attempting to call " 607 "__asan_get_allocated_size() for pointer which is " 608 "not owned: %p\n", addr); 609 Printf("%s", d.EndWarning()); 610 PrintStack(stack); 611 DescribeHeapAddress(addr, 1); 612 ReportSummary("bad-__asan_get_allocated_size", stack); 613} 614 615void ReportStringFunctionMemoryRangesOverlap( 616 const char *function, const char *offset1, uptr length1, 617 const char *offset2, uptr length2, StackTrace *stack) { 618 ScopedInErrorReport in_report; 619 Decorator d; 620 char bug_type[100]; 621 internal_snprintf(bug_type, sizeof(bug_type), "%s-param-overlap", function); 622 Printf("%s", d.Warning()); 623 Report("ERROR: AddressSanitizer: %s: " 624 "memory ranges [%p,%p) and [%p, %p) overlap\n", \ 625 bug_type, offset1, offset1 + length1, offset2, offset2 + length2); 626 Printf("%s", d.EndWarning()); 627 PrintStack(stack); 628 DescribeAddress((uptr)offset1, length1); 629 DescribeAddress((uptr)offset2, length2); 630 ReportSummary(bug_type, stack); 631} 632 633// ----------------------- Mac-specific reports ----------------- {{{1 634 635void WarnMacFreeUnallocated( 636 uptr addr, uptr zone_ptr, const char *zone_name, StackTrace *stack) { 637 // Just print a warning here. 638 Printf("free_common(%p) -- attempting to free unallocated memory.\n" 639 "AddressSanitizer is ignoring this error on Mac OS now.\n", 640 addr); 641 PrintZoneForPointer(addr, zone_ptr, zone_name); 642 PrintStack(stack); 643 DescribeHeapAddress(addr, 1); 644} 645 646void ReportMacMzReallocUnknown( 647 uptr addr, uptr zone_ptr, const char *zone_name, StackTrace *stack) { 648 ScopedInErrorReport in_report; 649 Printf("mz_realloc(%p) -- attempting to realloc unallocated memory.\n" 650 "This is an unrecoverable problem, exiting now.\n", 651 addr); 652 PrintZoneForPointer(addr, zone_ptr, zone_name); 653 PrintStack(stack); 654 DescribeHeapAddress(addr, 1); 655} 656 657void ReportMacCfReallocUnknown( 658 uptr addr, uptr zone_ptr, const char *zone_name, StackTrace *stack) { 659 ScopedInErrorReport in_report; 660 Printf("cf_realloc(%p) -- attempting to realloc unallocated memory.\n" 661 "This is an unrecoverable problem, exiting now.\n", 662 addr); 663 PrintZoneForPointer(addr, zone_ptr, zone_name); 664 PrintStack(stack); 665 DescribeHeapAddress(addr, 1); 666} 667 668} // namespace __asan 669 670// --------------------------- Interface --------------------- {{{1 671using namespace __asan; // NOLINT 672 673void __asan_report_error(uptr pc, uptr bp, uptr sp, 674 uptr addr, bool is_write, uptr access_size) { 675 ScopedInErrorReport in_report; 676 677 // Determine the error type. 678 const char *bug_descr = "unknown-crash"; 679 if (AddrIsInMem(addr)) { 680 u8 *shadow_addr = (u8*)MemToShadow(addr); 681 // If we are accessing 16 bytes, look at the second shadow byte. 682 if (*shadow_addr == 0 && access_size > SHADOW_GRANULARITY) 683 shadow_addr++; 684 // If we are in the partial right redzone, look at the next shadow byte. 685 if (*shadow_addr > 0 && *shadow_addr < 128) 686 shadow_addr++; 687 switch (*shadow_addr) { 688 case kAsanHeapLeftRedzoneMagic: 689 case kAsanHeapRightRedzoneMagic: 690 bug_descr = "heap-buffer-overflow"; 691 break; 692 case kAsanHeapFreeMagic: 693 bug_descr = "heap-use-after-free"; 694 break; 695 case kAsanStackLeftRedzoneMagic: 696 bug_descr = "stack-buffer-underflow"; 697 break; 698 case kAsanInitializationOrderMagic: 699 bug_descr = "initialization-order-fiasco"; 700 break; 701 case kAsanStackMidRedzoneMagic: 702 case kAsanStackRightRedzoneMagic: 703 case kAsanStackPartialRedzoneMagic: 704 bug_descr = "stack-buffer-overflow"; 705 break; 706 case kAsanStackAfterReturnMagic: 707 bug_descr = "stack-use-after-return"; 708 break; 709 case kAsanUserPoisonedMemoryMagic: 710 bug_descr = "use-after-poison"; 711 break; 712 case kAsanStackUseAfterScopeMagic: 713 bug_descr = "stack-use-after-scope"; 714 break; 715 case kAsanGlobalRedzoneMagic: 716 bug_descr = "global-buffer-overflow"; 717 break; 718 } 719 } 720 Decorator d; 721 Printf("%s", d.Warning()); 722 Report("ERROR: AddressSanitizer: %s on address " 723 "%p at pc 0x%zx bp 0x%zx sp 0x%zx\n", 724 bug_descr, (void*)addr, pc, bp, sp); 725 Printf("%s", d.EndWarning()); 726 727 u32 curr_tid = GetCurrentTidOrInvalid(); 728 char tname[128]; 729 Printf("%s%s of size %zu at %p thread T%d%s%s\n", 730 d.Access(), 731 access_size ? (is_write ? "WRITE" : "READ") : "ACCESS", 732 access_size, (void*)addr, curr_tid, 733 ThreadNameWithParenthesis(curr_tid, tname, sizeof(tname)), 734 d.EndAccess()); 735 736 GET_STACK_TRACE_FATAL(pc, bp); 737 PrintStack(&stack); 738 739 DescribeAddress(addr, access_size); 740 ReportSummary(bug_descr, &stack); 741 PrintShadowMemoryForAddress(addr); 742} 743 744void NOINLINE __asan_set_error_report_callback(void (*callback)(const char*)) { 745 error_report_callback = callback; 746 if (callback) { 747 error_message_buffer_size = 1 << 16; 748 error_message_buffer = 749 (char*)MmapOrDie(error_message_buffer_size, __FUNCTION__); 750 error_message_buffer_pos = 0; 751 } 752} 753 754void __asan_describe_address(uptr addr) { 755 DescribeAddress(addr, 1); 756} 757 758#if !SANITIZER_SUPPORTS_WEAK_HOOKS 759// Provide default implementation of __asan_on_error that does nothing 760// and may be overriden by user. 761SANITIZER_WEAK_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE NOINLINE 762void __asan_on_error() {} 763#endif 764