1 //===-- asan_errors.cpp -----------------------------------------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file is a part of AddressSanitizer, an address sanity checker.
10 //
11 // ASan implementation for error structures.
12 //===----------------------------------------------------------------------===//
13
14 #include "asan_errors.h"
15 #include "asan_descriptions.h"
16 #include "asan_mapping.h"
17 #include "asan_report.h"
18 #include "asan_stack.h"
19 #include "sanitizer_common/sanitizer_stackdepot.h"
20
21 namespace __asan {
22
OnStackUnwind(const SignalContext & sig,const void * callback_context,BufferedStackTrace * stack)23 static void OnStackUnwind(const SignalContext &sig,
24 const void *callback_context,
25 BufferedStackTrace *stack) {
26 bool fast = common_flags()->fast_unwind_on_fatal;
27 #if SANITIZER_FREEBSD || SANITIZER_NETBSD
28 // On FreeBSD the slow unwinding that leverages _Unwind_Backtrace()
29 // yields the call stack of the signal's handler and not of the code
30 // that raised the signal (as it does on Linux).
31 fast = true;
32 #endif
33 // Tests and maybe some users expect that scariness is going to be printed
34 // just before the stack. As only asan has scariness score we have no
35 // corresponding code in the sanitizer_common and we use this callback to
36 // print it.
37 static_cast<const ScarinessScoreBase *>(callback_context)->Print();
38 stack->Unwind(StackTrace::GetNextInstructionPc(sig.pc), sig.bp, sig.context,
39 fast);
40 }
41
Print()42 void ErrorDeadlySignal::Print() {
43 ReportDeadlySignal(signal, tid, &OnStackUnwind, &scariness);
44 }
45
Print()46 void ErrorDoubleFree::Print() {
47 Decorator d;
48 Printf("%s", d.Error());
49 Report("ERROR: AddressSanitizer: attempting %s on %p in thread %s:\n",
50 scariness.GetDescription(), (void *)addr_description.addr,
51 AsanThreadIdAndName(tid).c_str());
52 Printf("%s", d.Default());
53 scariness.Print();
54 GET_STACK_TRACE_FATAL(second_free_stack->trace[0],
55 second_free_stack->top_frame_bp);
56 stack.Print();
57 addr_description.Print();
58 ReportErrorSummary(scariness.GetDescription(), &stack);
59 }
60
Print()61 void ErrorNewDeleteTypeMismatch::Print() {
62 Decorator d;
63 Printf("%s", d.Error());
64 Report("ERROR: AddressSanitizer: %s on %p in thread %s:\n",
65 scariness.GetDescription(), (void *)addr_description.addr,
66 AsanThreadIdAndName(tid).c_str());
67 Printf("%s object passed to delete has wrong type:\n", d.Default());
68 if (delete_size != 0) {
69 Printf(
70 " size of the allocated type: %zd bytes;\n"
71 " size of the deallocated type: %zd bytes.\n",
72 addr_description.chunk_access.chunk_size, delete_size);
73 }
74 const uptr user_alignment =
75 addr_description.chunk_access.user_requested_alignment;
76 if (delete_alignment != user_alignment) {
77 char user_alignment_str[32];
78 char delete_alignment_str[32];
79 internal_snprintf(user_alignment_str, sizeof(user_alignment_str),
80 "%zd bytes", user_alignment);
81 internal_snprintf(delete_alignment_str, sizeof(delete_alignment_str),
82 "%zd bytes", delete_alignment);
83 static const char *kDefaultAlignment = "default-aligned";
84 Printf(
85 " alignment of the allocated type: %s;\n"
86 " alignment of the deallocated type: %s.\n",
87 user_alignment > 0 ? user_alignment_str : kDefaultAlignment,
88 delete_alignment > 0 ? delete_alignment_str : kDefaultAlignment);
89 }
90 CHECK_GT(free_stack->size, 0);
91 scariness.Print();
92 GET_STACK_TRACE_FATAL(free_stack->trace[0], free_stack->top_frame_bp);
93 stack.Print();
94 addr_description.Print();
95 ReportErrorSummary(scariness.GetDescription(), &stack);
96 Report(
97 "HINT: if you don't care about these errors you may set "
98 "ASAN_OPTIONS=new_delete_type_mismatch=0\n");
99 }
100
Print()101 void ErrorFreeNotMalloced::Print() {
102 Decorator d;
103 Printf("%s", d.Error());
104 Report(
105 "ERROR: AddressSanitizer: attempting free on address "
106 "which was not malloc()-ed: %p in thread %s\n",
107 (void *)addr_description.Address(), AsanThreadIdAndName(tid).c_str());
108 Printf("%s", d.Default());
109 CHECK_GT(free_stack->size, 0);
110 scariness.Print();
111 GET_STACK_TRACE_FATAL(free_stack->trace[0], free_stack->top_frame_bp);
112 stack.Print();
113 addr_description.Print();
114 ReportErrorSummary(scariness.GetDescription(), &stack);
115 }
116
Print()117 void ErrorAllocTypeMismatch::Print() {
118 static const char *alloc_names[] = {"INVALID", "malloc", "operator new",
119 "operator new []"};
120 static const char *dealloc_names[] = {"INVALID", "free", "operator delete",
121 "operator delete []"};
122 CHECK_NE(alloc_type, dealloc_type);
123 Decorator d;
124 Printf("%s", d.Error());
125 Report("ERROR: AddressSanitizer: %s (%s vs %s) on %p\n",
126 scariness.GetDescription(), alloc_names[alloc_type],
127 dealloc_names[dealloc_type], (void *)addr_description.Address());
128 Printf("%s", d.Default());
129 CHECK_GT(dealloc_stack->size, 0);
130 scariness.Print();
131 GET_STACK_TRACE_FATAL(dealloc_stack->trace[0], dealloc_stack->top_frame_bp);
132 stack.Print();
133 addr_description.Print();
134 ReportErrorSummary(scariness.GetDescription(), &stack);
135 Report(
136 "HINT: if you don't care about these errors you may set "
137 "ASAN_OPTIONS=alloc_dealloc_mismatch=0\n");
138 }
139
Print()140 void ErrorMallocUsableSizeNotOwned::Print() {
141 Decorator d;
142 Printf("%s", d.Error());
143 Report(
144 "ERROR: AddressSanitizer: attempting to call malloc_usable_size() for "
145 "pointer which is not owned: %p\n",
146 (void *)addr_description.Address());
147 Printf("%s", d.Default());
148 stack->Print();
149 addr_description.Print();
150 ReportErrorSummary(scariness.GetDescription(), stack);
151 }
152
Print()153 void ErrorSanitizerGetAllocatedSizeNotOwned::Print() {
154 Decorator d;
155 Printf("%s", d.Error());
156 Report(
157 "ERROR: AddressSanitizer: attempting to call "
158 "__sanitizer_get_allocated_size() for pointer which is not owned: %p\n",
159 (void *)addr_description.Address());
160 Printf("%s", d.Default());
161 stack->Print();
162 addr_description.Print();
163 ReportErrorSummary(scariness.GetDescription(), stack);
164 }
165
Print()166 void ErrorCallocOverflow::Print() {
167 Decorator d;
168 Printf("%s", d.Error());
169 Report(
170 "ERROR: AddressSanitizer: calloc parameters overflow: count * size "
171 "(%zd * %zd) cannot be represented in type size_t (thread %s)\n",
172 count, size, AsanThreadIdAndName(tid).c_str());
173 Printf("%s", d.Default());
174 stack->Print();
175 PrintHintAllocatorCannotReturnNull();
176 ReportErrorSummary(scariness.GetDescription(), stack);
177 }
178
Print()179 void ErrorReallocArrayOverflow::Print() {
180 Decorator d;
181 Printf("%s", d.Error());
182 Report(
183 "ERROR: AddressSanitizer: reallocarray parameters overflow: count * size "
184 "(%zd * %zd) cannot be represented in type size_t (thread %s)\n",
185 count, size, AsanThreadIdAndName(tid).c_str());
186 Printf("%s", d.Default());
187 stack->Print();
188 PrintHintAllocatorCannotReturnNull();
189 ReportErrorSummary(scariness.GetDescription(), stack);
190 }
191
Print()192 void ErrorPvallocOverflow::Print() {
193 Decorator d;
194 Printf("%s", d.Error());
195 Report(
196 "ERROR: AddressSanitizer: pvalloc parameters overflow: size 0x%zx "
197 "rounded up to system page size 0x%zx cannot be represented in type "
198 "size_t (thread %s)\n",
199 size, GetPageSizeCached(), AsanThreadIdAndName(tid).c_str());
200 Printf("%s", d.Default());
201 stack->Print();
202 PrintHintAllocatorCannotReturnNull();
203 ReportErrorSummary(scariness.GetDescription(), stack);
204 }
205
Print()206 void ErrorInvalidAllocationAlignment::Print() {
207 Decorator d;
208 Printf("%s", d.Error());
209 Report(
210 "ERROR: AddressSanitizer: invalid allocation alignment: %zd, "
211 "alignment must be a power of two (thread %s)\n",
212 alignment, AsanThreadIdAndName(tid).c_str());
213 Printf("%s", d.Default());
214 stack->Print();
215 PrintHintAllocatorCannotReturnNull();
216 ReportErrorSummary(scariness.GetDescription(), stack);
217 }
218
Print()219 void ErrorInvalidAlignedAllocAlignment::Print() {
220 Decorator d;
221 Printf("%s", d.Error());
222 #if SANITIZER_POSIX
223 Report("ERROR: AddressSanitizer: invalid alignment requested in "
224 "aligned_alloc: %zd, alignment must be a power of two and the "
225 "requested size 0x%zx must be a multiple of alignment "
226 "(thread %s)\n", alignment, size, AsanThreadIdAndName(tid).c_str());
227 #else
228 Report("ERROR: AddressSanitizer: invalid alignment requested in "
229 "aligned_alloc: %zd, the requested size 0x%zx must be a multiple of "
230 "alignment (thread %s)\n", alignment, size,
231 AsanThreadIdAndName(tid).c_str());
232 #endif
233 Printf("%s", d.Default());
234 stack->Print();
235 PrintHintAllocatorCannotReturnNull();
236 ReportErrorSummary(scariness.GetDescription(), stack);
237 }
238
Print()239 void ErrorInvalidPosixMemalignAlignment::Print() {
240 Decorator d;
241 Printf("%s", d.Error());
242 Report(
243 "ERROR: AddressSanitizer: invalid alignment requested in posix_memalign: "
244 "%zd, alignment must be a power of two and a multiple of sizeof(void*) "
245 "== %zd (thread %s)\n",
246 alignment, sizeof(void *), AsanThreadIdAndName(tid).c_str());
247 Printf("%s", d.Default());
248 stack->Print();
249 PrintHintAllocatorCannotReturnNull();
250 ReportErrorSummary(scariness.GetDescription(), stack);
251 }
252
Print()253 void ErrorAllocationSizeTooBig::Print() {
254 Decorator d;
255 Printf("%s", d.Error());
256 Report(
257 "ERROR: AddressSanitizer: requested allocation size 0x%zx (0x%zx after "
258 "adjustments for alignment, red zones etc.) exceeds maximum supported "
259 "size of 0x%zx (thread %s)\n",
260 user_size, total_size, max_size, AsanThreadIdAndName(tid).c_str());
261 Printf("%s", d.Default());
262 stack->Print();
263 PrintHintAllocatorCannotReturnNull();
264 ReportErrorSummary(scariness.GetDescription(), stack);
265 }
266
Print()267 void ErrorRssLimitExceeded::Print() {
268 Decorator d;
269 Printf("%s", d.Error());
270 Report(
271 "ERROR: AddressSanitizer: specified RSS limit exceeded, currently set to "
272 "soft_rss_limit_mb=%zd\n", common_flags()->soft_rss_limit_mb);
273 Printf("%s", d.Default());
274 stack->Print();
275 PrintHintAllocatorCannotReturnNull();
276 ReportErrorSummary(scariness.GetDescription(), stack);
277 }
278
Print()279 void ErrorOutOfMemory::Print() {
280 Decorator d;
281 Printf("%s", d.Error());
282 Report(
283 "ERROR: AddressSanitizer: allocator is out of memory trying to allocate "
284 "0x%zx bytes\n", requested_size);
285 Printf("%s", d.Default());
286 stack->Print();
287 PrintHintAllocatorCannotReturnNull();
288 ReportErrorSummary(scariness.GetDescription(), stack);
289 }
290
Print()291 void ErrorStringFunctionMemoryRangesOverlap::Print() {
292 Decorator d;
293 char bug_type[100];
294 internal_snprintf(bug_type, sizeof(bug_type), "%s-param-overlap", function);
295 Printf("%s", d.Error());
296 Report(
297 "ERROR: AddressSanitizer: %s: memory ranges [%p,%p) and [%p, %p) "
298 "overlap\n",
299 bug_type, (void *)addr1_description.Address(),
300 (void *)(addr1_description.Address() + length1),
301 (void *)addr2_description.Address(),
302 (void *)(addr2_description.Address() + length2));
303 Printf("%s", d.Default());
304 scariness.Print();
305 stack->Print();
306 addr1_description.Print();
307 addr2_description.Print();
308 ReportErrorSummary(bug_type, stack);
309 }
310
Print()311 void ErrorStringFunctionSizeOverflow::Print() {
312 Decorator d;
313 Printf("%s", d.Error());
314 Report("ERROR: AddressSanitizer: %s: (size=%zd)\n",
315 scariness.GetDescription(), size);
316 Printf("%s", d.Default());
317 scariness.Print();
318 stack->Print();
319 addr_description.Print();
320 ReportErrorSummary(scariness.GetDescription(), stack);
321 }
322
Print()323 void ErrorBadParamsToAnnotateContiguousContainer::Print() {
324 Report(
325 "ERROR: AddressSanitizer: bad parameters to "
326 "__sanitizer_annotate_contiguous_container:\n"
327 " beg : %p\n"
328 " end : %p\n"
329 " old_mid : %p\n"
330 " new_mid : %p\n",
331 (void *)beg, (void *)end, (void *)old_mid, (void *)new_mid);
332 uptr granularity = SHADOW_GRANULARITY;
333 if (!IsAligned(beg, granularity))
334 Report("ERROR: beg is not aligned by %zu\n", granularity);
335 stack->Print();
336 ReportErrorSummary(scariness.GetDescription(), stack);
337 }
338
Print()339 void ErrorODRViolation::Print() {
340 Decorator d;
341 Printf("%s", d.Error());
342 Report("ERROR: AddressSanitizer: %s (%p):\n", scariness.GetDescription(),
343 (void *)global1.beg);
344 Printf("%s", d.Default());
345 InternalScopedString g1_loc;
346 InternalScopedString g2_loc;
347 PrintGlobalLocation(&g1_loc, global1);
348 PrintGlobalLocation(&g2_loc, global2);
349 Printf(" [1] size=%zd '%s' %s\n", global1.size,
350 MaybeDemangleGlobalName(global1.name), g1_loc.data());
351 Printf(" [2] size=%zd '%s' %s\n", global2.size,
352 MaybeDemangleGlobalName(global2.name), g2_loc.data());
353 if (stack_id1 && stack_id2) {
354 Printf("These globals were registered at these points:\n");
355 Printf(" [1]:\n");
356 StackDepotGet(stack_id1).Print();
357 Printf(" [2]:\n");
358 StackDepotGet(stack_id2).Print();
359 }
360 Report(
361 "HINT: if you don't care about these errors you may set "
362 "ASAN_OPTIONS=detect_odr_violation=0\n");
363 InternalScopedString error_msg;
364 error_msg.append("%s: global '%s' at %s", scariness.GetDescription(),
365 MaybeDemangleGlobalName(global1.name), g1_loc.data());
366 ReportErrorSummary(error_msg.data());
367 }
368
Print()369 void ErrorInvalidPointerPair::Print() {
370 Decorator d;
371 Printf("%s", d.Error());
372 Report("ERROR: AddressSanitizer: %s: %p %p\n", scariness.GetDescription(),
373 (void *)addr1_description.Address(),
374 (void *)addr2_description.Address());
375 Printf("%s", d.Default());
376 GET_STACK_TRACE_FATAL(pc, bp);
377 stack.Print();
378 addr1_description.Print();
379 addr2_description.Print();
380 ReportErrorSummary(scariness.GetDescription(), &stack);
381 }
382
AdjacentShadowValuesAreFullyPoisoned(u8 * s)383 static bool AdjacentShadowValuesAreFullyPoisoned(u8 *s) {
384 return s[-1] > 127 && s[1] > 127;
385 }
386
ErrorGeneric(u32 tid,uptr pc_,uptr bp_,uptr sp_,uptr addr,bool is_write_,uptr access_size_)387 ErrorGeneric::ErrorGeneric(u32 tid, uptr pc_, uptr bp_, uptr sp_, uptr addr,
388 bool is_write_, uptr access_size_)
389 : ErrorBase(tid),
390 addr_description(addr, access_size_, /*shouldLockThreadRegistry=*/false),
391 pc(pc_),
392 bp(bp_),
393 sp(sp_),
394 access_size(access_size_),
395 is_write(is_write_),
396 shadow_val(0) {
397 scariness.Clear();
398 if (access_size) {
399 if (access_size <= 9) {
400 char desr[] = "?-byte";
401 desr[0] = '0' + access_size;
402 scariness.Scare(access_size + access_size / 2, desr);
403 } else if (access_size >= 10) {
404 scariness.Scare(15, "multi-byte");
405 }
406 is_write ? scariness.Scare(20, "write") : scariness.Scare(1, "read");
407
408 // Determine the error type.
409 bug_descr = "unknown-crash";
410 if (AddrIsInMem(addr)) {
411 u8 *shadow_addr = (u8 *)MemToShadow(addr);
412 // If we are accessing 16 bytes, look at the second shadow byte.
413 if (*shadow_addr == 0 && access_size > SHADOW_GRANULARITY) shadow_addr++;
414 // If we are in the partial right redzone, look at the next shadow byte.
415 if (*shadow_addr > 0 && *shadow_addr < 128) shadow_addr++;
416 bool far_from_bounds = false;
417 shadow_val = *shadow_addr;
418 int bug_type_score = 0;
419 // For use-after-frees reads are almost as bad as writes.
420 int read_after_free_bonus = 0;
421 switch (shadow_val) {
422 case kAsanHeapLeftRedzoneMagic:
423 case kAsanArrayCookieMagic:
424 bug_descr = "heap-buffer-overflow";
425 bug_type_score = 10;
426 far_from_bounds = AdjacentShadowValuesAreFullyPoisoned(shadow_addr);
427 break;
428 case kAsanHeapFreeMagic:
429 bug_descr = "heap-use-after-free";
430 bug_type_score = 20;
431 if (!is_write) read_after_free_bonus = 18;
432 break;
433 case kAsanStackLeftRedzoneMagic:
434 bug_descr = "stack-buffer-underflow";
435 bug_type_score = 25;
436 far_from_bounds = AdjacentShadowValuesAreFullyPoisoned(shadow_addr);
437 break;
438 case kAsanInitializationOrderMagic:
439 bug_descr = "initialization-order-fiasco";
440 bug_type_score = 1;
441 break;
442 case kAsanStackMidRedzoneMagic:
443 case kAsanStackRightRedzoneMagic:
444 bug_descr = "stack-buffer-overflow";
445 bug_type_score = 25;
446 far_from_bounds = AdjacentShadowValuesAreFullyPoisoned(shadow_addr);
447 break;
448 case kAsanStackAfterReturnMagic:
449 bug_descr = "stack-use-after-return";
450 bug_type_score = 30;
451 if (!is_write) read_after_free_bonus = 18;
452 break;
453 case kAsanUserPoisonedMemoryMagic:
454 bug_descr = "use-after-poison";
455 bug_type_score = 20;
456 break;
457 case kAsanContiguousContainerOOBMagic:
458 bug_descr = "container-overflow";
459 bug_type_score = 10;
460 break;
461 case kAsanStackUseAfterScopeMagic:
462 bug_descr = "stack-use-after-scope";
463 bug_type_score = 10;
464 break;
465 case kAsanGlobalRedzoneMagic:
466 bug_descr = "global-buffer-overflow";
467 bug_type_score = 10;
468 far_from_bounds = AdjacentShadowValuesAreFullyPoisoned(shadow_addr);
469 break;
470 case kAsanIntraObjectRedzone:
471 bug_descr = "intra-object-overflow";
472 bug_type_score = 10;
473 break;
474 case kAsanAllocaLeftMagic:
475 case kAsanAllocaRightMagic:
476 bug_descr = "dynamic-stack-buffer-overflow";
477 bug_type_score = 25;
478 far_from_bounds = AdjacentShadowValuesAreFullyPoisoned(shadow_addr);
479 break;
480 }
481 scariness.Scare(bug_type_score + read_after_free_bonus, bug_descr);
482 if (far_from_bounds) scariness.Scare(10, "far-from-bounds");
483 }
484 }
485 }
486
PrintContainerOverflowHint()487 static void PrintContainerOverflowHint() {
488 Printf("HINT: if you don't care about these errors you may set "
489 "ASAN_OPTIONS=detect_container_overflow=0.\n"
490 "If you suspect a false positive see also: "
491 "https://github.com/google/sanitizers/wiki/"
492 "AddressSanitizerContainerOverflow.\n");
493 }
494
PrintShadowByte(InternalScopedString * str,const char * before,u8 byte,const char * after="\\n")495 static void PrintShadowByte(InternalScopedString *str, const char *before,
496 u8 byte, const char *after = "\n") {
497 PrintMemoryByte(str, before, byte, /*in_shadow*/true, after);
498 }
499
PrintLegend(InternalScopedString * str)500 static void PrintLegend(InternalScopedString *str) {
501 str->append(
502 "Shadow byte legend (one shadow byte represents %d "
503 "application bytes):\n",
504 (int)SHADOW_GRANULARITY);
505 PrintShadowByte(str, " Addressable: ", 0);
506 str->append(" Partially addressable: ");
507 for (u8 i = 1; i < SHADOW_GRANULARITY; i++) PrintShadowByte(str, "", i, " ");
508 str->append("\n");
509 PrintShadowByte(str, " Heap left redzone: ",
510 kAsanHeapLeftRedzoneMagic);
511 PrintShadowByte(str, " Freed heap region: ", kAsanHeapFreeMagic);
512 PrintShadowByte(str, " Stack left redzone: ",
513 kAsanStackLeftRedzoneMagic);
514 PrintShadowByte(str, " Stack mid redzone: ",
515 kAsanStackMidRedzoneMagic);
516 PrintShadowByte(str, " Stack right redzone: ",
517 kAsanStackRightRedzoneMagic);
518 PrintShadowByte(str, " Stack after return: ",
519 kAsanStackAfterReturnMagic);
520 PrintShadowByte(str, " Stack use after scope: ",
521 kAsanStackUseAfterScopeMagic);
522 PrintShadowByte(str, " Global redzone: ", kAsanGlobalRedzoneMagic);
523 PrintShadowByte(str, " Global init order: ",
524 kAsanInitializationOrderMagic);
525 PrintShadowByte(str, " Poisoned by user: ",
526 kAsanUserPoisonedMemoryMagic);
527 PrintShadowByte(str, " Container overflow: ",
528 kAsanContiguousContainerOOBMagic);
529 PrintShadowByte(str, " Array cookie: ",
530 kAsanArrayCookieMagic);
531 PrintShadowByte(str, " Intra object redzone: ",
532 kAsanIntraObjectRedzone);
533 PrintShadowByte(str, " ASan internal: ", kAsanInternalHeapMagic);
534 PrintShadowByte(str, " Left alloca redzone: ", kAsanAllocaLeftMagic);
535 PrintShadowByte(str, " Right alloca redzone: ", kAsanAllocaRightMagic);
536 }
537
PrintShadowBytes(InternalScopedString * str,const char * before,u8 * bytes,u8 * guilty,uptr n)538 static void PrintShadowBytes(InternalScopedString *str, const char *before,
539 u8 *bytes, u8 *guilty, uptr n) {
540 Decorator d;
541 if (before)
542 str->append("%s%p:", before, (void *)bytes);
543 for (uptr i = 0; i < n; i++) {
544 u8 *p = bytes + i;
545 const char *before =
546 p == guilty ? "[" : (p - 1 == guilty && i != 0) ? "" : " ";
547 const char *after = p == guilty ? "]" : "";
548 PrintShadowByte(str, before, *p, after);
549 }
550 str->append("\n");
551 }
552
PrintShadowMemoryForAddress(uptr addr)553 static void PrintShadowMemoryForAddress(uptr addr) {
554 if (!AddrIsInMem(addr)) return;
555 uptr shadow_addr = MemToShadow(addr);
556 const uptr n_bytes_per_row = 16;
557 uptr aligned_shadow = shadow_addr & ~(n_bytes_per_row - 1);
558 InternalScopedString str;
559 str.append("Shadow bytes around the buggy address:\n");
560 for (int i = -5; i <= 5; i++) {
561 uptr row_shadow_addr = aligned_shadow + i * n_bytes_per_row;
562 // Skip rows that would be outside the shadow range. This can happen when
563 // the user address is near the bottom, top, or shadow gap of the address
564 // space.
565 if (!AddrIsInShadow(row_shadow_addr)) continue;
566 const char *prefix = (i == 0) ? "=>" : " ";
567 PrintShadowBytes(&str, prefix, (u8 *)row_shadow_addr, (u8 *)shadow_addr,
568 n_bytes_per_row);
569 }
570 if (flags()->print_legend) PrintLegend(&str);
571 Printf("%s", str.data());
572 }
573
Print()574 void ErrorGeneric::Print() {
575 Decorator d;
576 Printf("%s", d.Error());
577 uptr addr = addr_description.Address();
578 Report("ERROR: AddressSanitizer: %s on address %p at pc %p bp %p sp %p\n",
579 bug_descr, (void *)addr, (void *)pc, (void *)bp, (void *)sp);
580 Printf("%s", d.Default());
581
582 Printf("%s%s of size %zu at %p thread %s%s\n", d.Access(),
583 access_size ? (is_write ? "WRITE" : "READ") : "ACCESS", access_size,
584 (void *)addr, AsanThreadIdAndName(tid).c_str(), d.Default());
585
586 scariness.Print();
587 GET_STACK_TRACE_FATAL(pc, bp);
588 stack.Print();
589
590 // Pass bug_descr because we have a special case for
591 // initialization-order-fiasco
592 addr_description.Print(bug_descr);
593 if (shadow_val == kAsanContiguousContainerOOBMagic)
594 PrintContainerOverflowHint();
595 ReportErrorSummary(bug_descr, &stack);
596 PrintShadowMemoryForAddress(addr);
597 }
598
599 } // namespace __asan
600