| //===-- asan_report.cc ----------------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file is a part of AddressSanitizer, an address sanity checker. |
| // |
| // This file contains error reporting code. |
| //===----------------------------------------------------------------------===// |
| #include "asan_flags.h" |
| #include "asan_internal.h" |
| #include "asan_mapping.h" |
| #include "asan_report.h" |
| #include "asan_stack.h" |
| #include "asan_thread.h" |
| #include "asan_thread_registry.h" |
| #include "sanitizer_common/sanitizer_common.h" |
| #include "sanitizer_common/sanitizer_report_decorator.h" |
| #include "sanitizer_common/sanitizer_symbolizer.h" |
| |
| namespace __asan { |
| |
| // -------------------- User-specified callbacks ----------------- {{{1 |
| static void (*error_report_callback)(const char*); |
| static char *error_message_buffer = 0; |
| static uptr error_message_buffer_pos = 0; |
| static uptr error_message_buffer_size = 0; |
| |
| void AppendToErrorMessageBuffer(const char *buffer) { |
| if (error_message_buffer) { |
| uptr length = internal_strlen(buffer); |
| CHECK_GE(error_message_buffer_size, error_message_buffer_pos); |
| uptr remaining = error_message_buffer_size - error_message_buffer_pos; |
| internal_strncpy(error_message_buffer + error_message_buffer_pos, |
| buffer, remaining); |
| error_message_buffer[error_message_buffer_size - 1] = '\0'; |
| // FIXME: reallocate the buffer instead of truncating the message. |
| error_message_buffer_pos += remaining > length ? length : remaining; |
| } |
| } |
| |
| // ---------------------- Decorator ------------------------------ {{{1 |
| bool PrintsToTtyCached() { |
| static int cached = 0; |
| static bool prints_to_tty; |
| if (!cached) { // Ok wrt threads since we are printing only from one thread. |
| prints_to_tty = PrintsToTty(); |
| cached = 1; |
| } |
| return prints_to_tty; |
| } |
| class Decorator: private __sanitizer::AnsiColorDecorator { |
| public: |
| Decorator() : __sanitizer::AnsiColorDecorator(PrintsToTtyCached()) { } |
| const char *Warning() { return Red(); } |
| const char *EndWarning() { return Default(); } |
| const char *Access() { return Blue(); } |
| const char *EndAccess() { return Default(); } |
| const char *Location() { return Green(); } |
| const char *EndLocation() { return Default(); } |
| const char *Allocation() { return Magenta(); } |
| const char *EndAllocation() { return Default(); } |
| |
| const char *ShadowByte(u8 byte) { |
| switch (byte) { |
| case kAsanHeapLeftRedzoneMagic: |
| case kAsanHeapRightRedzoneMagic: |
| return Red(); |
| case kAsanHeapFreeMagic: |
| return Magenta(); |
| case kAsanStackLeftRedzoneMagic: |
| case kAsanStackMidRedzoneMagic: |
| case kAsanStackRightRedzoneMagic: |
| case kAsanStackPartialRedzoneMagic: |
| return Red(); |
| case kAsanStackAfterReturnMagic: |
| return Magenta(); |
| case kAsanInitializationOrderMagic: |
| return Cyan(); |
| case kAsanUserPoisonedMemoryMagic: |
| return Blue(); |
| case kAsanStackUseAfterScopeMagic: |
| return Magenta(); |
| case kAsanGlobalRedzoneMagic: |
| return Red(); |
| case kAsanInternalHeapMagic: |
| return Yellow(); |
| default: |
| return Default(); |
| } |
| } |
| const char *EndShadowByte() { return Default(); } |
| }; |
| |
| // ---------------------- Helper functions ----------------------- {{{1 |
| |
| static void PrintShadowByte(const char *before, u8 byte, |
| const char *after = "\n") { |
| Decorator d; |
| Printf("%s%s%x%x%s%s", before, |
| d.ShadowByte(byte), byte >> 4, byte & 15, d.EndShadowByte(), after); |
| } |
| |
| static void PrintShadowBytes(const char *before, u8 *bytes, |
| u8 *guilty, uptr n) { |
| Decorator d; |
| if (before) |
| Printf("%s%p:", before, bytes); |
| for (uptr i = 0; i < n; i++) { |
| u8 *p = bytes + i; |
| const char *before = p == guilty ? "[" : |
| p - 1 == guilty ? "" : " "; |
| const char *after = p == guilty ? "]" : ""; |
| PrintShadowByte(before, *p, after); |
| } |
| Printf("\n"); |
| } |
| |
| static void PrintLegend() { |
| Printf("Shadow byte legend (one shadow byte represents %d " |
| "application bytes):\n", (int)SHADOW_GRANULARITY); |
| PrintShadowByte(" Addressable: ", 0); |
| Printf(" Partially addressable: "); |
| for (uptr i = 1; i < SHADOW_GRANULARITY; i++) |
| PrintShadowByte("", i, " "); |
| Printf("\n"); |
| PrintShadowByte(" Heap left redzone: ", kAsanHeapLeftRedzoneMagic); |
| PrintShadowByte(" Heap righ redzone: ", kAsanHeapRightRedzoneMagic); |
| PrintShadowByte(" Freed Heap region: ", kAsanHeapFreeMagic); |
| PrintShadowByte(" Stack left redzone: ", kAsanStackLeftRedzoneMagic); |
| PrintShadowByte(" Stack mid redzone: ", kAsanStackMidRedzoneMagic); |
| PrintShadowByte(" Stack right redzone: ", kAsanStackRightRedzoneMagic); |
| PrintShadowByte(" Stack partial redzone: ", kAsanStackPartialRedzoneMagic); |
| PrintShadowByte(" Stack after return: ", kAsanStackAfterReturnMagic); |
| PrintShadowByte(" Stack use after scope: ", kAsanStackUseAfterScopeMagic); |
| PrintShadowByte(" Global redzone: ", kAsanGlobalRedzoneMagic); |
| PrintShadowByte(" Global init order: ", kAsanInitializationOrderMagic); |
| PrintShadowByte(" Poisoned by user: ", kAsanUserPoisonedMemoryMagic); |
| PrintShadowByte(" ASan internal: ", kAsanInternalHeapMagic); |
| } |
| |
| static void PrintShadowMemoryForAddress(uptr addr) { |
| if (!AddrIsInMem(addr)) |
| return; |
| uptr shadow_addr = MemToShadow(addr); |
| const uptr n_bytes_per_row = 16; |
| uptr aligned_shadow = shadow_addr & ~(n_bytes_per_row - 1); |
| Printf("Shadow bytes around the buggy address:\n"); |
| for (int i = -5; i <= 5; i++) { |
| const char *prefix = (i == 0) ? "=>" : " "; |
| PrintShadowBytes(prefix, |
| (u8*)(aligned_shadow + i * n_bytes_per_row), |
| (u8*)shadow_addr, n_bytes_per_row); |
| } |
| if (flags()->print_legend) |
| PrintLegend(); |
| } |
| |
| static void PrintZoneForPointer(uptr ptr, uptr zone_ptr, |
| const char *zone_name) { |
| if (zone_ptr) { |
| if (zone_name) { |
| Printf("malloc_zone_from_ptr(%p) = %p, which is %s\n", |
| ptr, zone_ptr, zone_name); |
| } else { |
| Printf("malloc_zone_from_ptr(%p) = %p, which doesn't have a name\n", |
| ptr, zone_ptr); |
| } |
| } else { |
| Printf("malloc_zone_from_ptr(%p) = 0\n", ptr); |
| } |
| } |
| |
| // ---------------------- Address Descriptions ------------------- {{{1 |
| |
| static bool IsASCII(unsigned char c) { |
| return /*0x00 <= c &&*/ c <= 0x7F; |
| } |
| |
| // Check if the global is a zero-terminated ASCII string. If so, print it. |
| static void PrintGlobalNameIfASCII(const __asan_global &g) { |
| for (uptr p = g.beg; p < g.beg + g.size - 1; p++) { |
| if (!IsASCII(*(unsigned char*)p)) return; |
| } |
| if (*(char*)(g.beg + g.size - 1) != 0) return; |
| Printf(" '%s' is ascii string '%s'\n", g.name, (char*)g.beg); |
| } |
| |
| bool DescribeAddressRelativeToGlobal(uptr addr, uptr size, |
| const __asan_global &g) { |
| static const uptr kMinimalDistanceFromAnotherGlobal = 64; |
| if (addr <= g.beg - kMinimalDistanceFromAnotherGlobal) return false; |
| if (addr >= g.beg + g.size_with_redzone) return false; |
| Decorator d; |
| Printf("%s", d.Location()); |
| if (addr < g.beg) { |
| Printf("%p is located %zd bytes to the left", (void*)addr, g.beg - addr); |
| } else if (addr + size > g.beg + g.size) { |
| if (addr < g.beg + g.size) |
| addr = g.beg + g.size; |
| Printf("%p is located %zd bytes to the right", (void*)addr, |
| addr - (g.beg + g.size)); |
| } else { |
| // Can it happen? |
| Printf("%p is located %zd bytes inside", (void*)addr, addr - g.beg); |
| } |
| Printf(" of global variable '%s' from '%s' (0x%zx) of size %zu\n", |
| g.name, g.module_name, g.beg, g.size); |
| Printf("%s", d.EndLocation()); |
| PrintGlobalNameIfASCII(g); |
| return true; |
| } |
| |
| bool DescribeAddressIfShadow(uptr addr) { |
| if (AddrIsInMem(addr)) |
| return false; |
| static const char kAddrInShadowReport[] = |
| "Address %p is located in the %s.\n"; |
| if (AddrIsInShadowGap(addr)) { |
| Printf(kAddrInShadowReport, addr, "shadow gap area"); |
| return true; |
| } |
| if (AddrIsInHighShadow(addr)) { |
| Printf(kAddrInShadowReport, addr, "high shadow area"); |
| return true; |
| } |
| if (AddrIsInLowShadow(addr)) { |
| Printf(kAddrInShadowReport, addr, "low shadow area"); |
| return true; |
| } |
| CHECK(0 && "Address is not in memory and not in shadow?"); |
| return false; |
| } |
| |
| bool DescribeAddressIfStack(uptr addr, uptr access_size) { |
| AsanThread *t = asanThreadRegistry().FindThreadByStackAddress(addr); |
| if (!t) return false; |
| const sptr kBufSize = 4095; |
| char buf[kBufSize]; |
| uptr offset = 0; |
| const char *frame_descr = t->GetFrameNameByAddr(addr, &offset); |
| // This string is created by the compiler and has the following form: |
| // "FunctioName n alloc_1 alloc_2 ... alloc_n" |
| // where alloc_i looks like "offset size len ObjectName ". |
| CHECK(frame_descr); |
| // Report the function name and the offset. |
| const char *name_end = internal_strchr(frame_descr, ' '); |
| CHECK(name_end); |
| buf[0] = 0; |
| internal_strncat(buf, frame_descr, |
| Min(kBufSize, |
| static_cast<sptr>(name_end - frame_descr))); |
| Decorator d; |
| Printf("%s", d.Location()); |
| Printf("Address %p is located at offset %zu " |
| "in frame <%s> of T%d's stack:\n", |
| (void*)addr, offset, Demangle(buf), t->tid()); |
| Printf("%s", d.EndLocation()); |
| // Report the number of stack objects. |
| char *p; |
| uptr n_objects = internal_simple_strtoll(name_end, &p, 10); |
| CHECK(n_objects > 0); |
| Printf(" This frame has %zu object(s):\n", n_objects); |
| // Report all objects in this frame. |
| for (uptr i = 0; i < n_objects; i++) { |
| uptr beg, size; |
| sptr len; |
| beg = internal_simple_strtoll(p, &p, 10); |
| size = internal_simple_strtoll(p, &p, 10); |
| len = internal_simple_strtoll(p, &p, 10); |
| if (beg <= 0 || size <= 0 || len < 0 || *p != ' ') { |
| Printf("AddressSanitizer can't parse the stack frame " |
| "descriptor: |%s|\n", frame_descr); |
| break; |
| } |
| p++; |
| buf[0] = 0; |
| internal_strncat(buf, p, Min(kBufSize, len)); |
| p += len; |
| Printf(" [%zu, %zu) '%s'\n", beg, beg + size, buf); |
| } |
| Printf("HINT: this may be a false positive if your program uses " |
| "some custom stack unwind mechanism or swapcontext\n" |
| " (longjmp and C++ exceptions *are* supported)\n"); |
| DescribeThread(t->summary()); |
| return true; |
| } |
| |
| static void DescribeAccessToHeapChunk(AsanChunkView chunk, uptr addr, |
| uptr access_size) { |
| sptr offset; |
| Decorator d; |
| Printf("%s", d.Location()); |
| if (chunk.AddrIsAtLeft(addr, access_size, &offset)) { |
| Printf("%p is located %zd bytes to the left of", (void*)addr, offset); |
| } else if (chunk.AddrIsAtRight(addr, access_size, &offset)) { |
| if (offset < 0) { |
| addr -= offset; |
| offset = 0; |
| } |
| Printf("%p is located %zd bytes to the right of", (void*)addr, offset); |
| } else if (chunk.AddrIsInside(addr, access_size, &offset)) { |
| Printf("%p is located %zd bytes inside of", (void*)addr, offset); |
| } else { |
| Printf("%p is located somewhere around (this is AddressSanitizer bug!)", |
| (void*)addr); |
| } |
| Printf(" %zu-byte region [%p,%p)\n", chunk.UsedSize(), |
| (void*)(chunk.Beg()), (void*)(chunk.End())); |
| Printf("%s", d.EndLocation()); |
| } |
| |
| // Return " (thread_name) " or an empty string if the name is empty. |
| const char *ThreadNameWithParenthesis(AsanThreadSummary *t, char buff[], |
| uptr buff_len) { |
| const char *name = t->name(); |
| if (*name == 0) return ""; |
| buff[0] = 0; |
| internal_strncat(buff, " (", 3); |
| internal_strncat(buff, name, buff_len - 4); |
| internal_strncat(buff, ")", 2); |
| return buff; |
| } |
| |
| const char *ThreadNameWithParenthesis(u32 tid, char buff[], |
| uptr buff_len) { |
| if (tid == kInvalidTid) return ""; |
| AsanThreadSummary *t = asanThreadRegistry().FindByTid(tid); |
| return ThreadNameWithParenthesis(t, buff, buff_len); |
| } |
| |
| void DescribeHeapAddress(uptr addr, uptr access_size) { |
| AsanChunkView chunk = FindHeapChunkByAddress(addr); |
| if (!chunk.IsValid()) return; |
| DescribeAccessToHeapChunk(chunk, addr, access_size); |
| CHECK(chunk.AllocTid() != kInvalidTid); |
| AsanThreadSummary *alloc_thread = |
| asanThreadRegistry().FindByTid(chunk.AllocTid()); |
| StackTrace alloc_stack; |
| chunk.GetAllocStack(&alloc_stack); |
| AsanThread *t = asanThreadRegistry().GetCurrent(); |
| CHECK(t); |
| char tname[128]; |
| Decorator d; |
| if (chunk.FreeTid() != kInvalidTid) { |
| AsanThreadSummary *free_thread = |
| asanThreadRegistry().FindByTid(chunk.FreeTid()); |
| Printf("%sfreed by thread T%d%s here:%s\n", d.Allocation(), |
| free_thread->tid(), |
| ThreadNameWithParenthesis(free_thread, tname, sizeof(tname)), |
| d.EndAllocation()); |
| StackTrace free_stack; |
| chunk.GetFreeStack(&free_stack); |
| PrintStack(&free_stack); |
| Printf("%spreviously allocated by thread T%d%s here:%s\n", |
| d.Allocation(), alloc_thread->tid(), |
| ThreadNameWithParenthesis(alloc_thread, tname, sizeof(tname)), |
| d.EndAllocation()); |
| PrintStack(&alloc_stack); |
| DescribeThread(t->summary()); |
| DescribeThread(free_thread); |
| DescribeThread(alloc_thread); |
| } else { |
| Printf("%sallocated by thread T%d%s here:%s\n", d.Allocation(), |
| alloc_thread->tid(), |
| ThreadNameWithParenthesis(alloc_thread, tname, sizeof(tname)), |
| d.EndAllocation()); |
| PrintStack(&alloc_stack); |
| DescribeThread(t->summary()); |
| DescribeThread(alloc_thread); |
| } |
| } |
| |
| void DescribeAddress(uptr addr, uptr access_size) { |
| // Check if this is shadow or shadow gap. |
| if (DescribeAddressIfShadow(addr)) |
| return; |
| CHECK(AddrIsInMem(addr)); |
| if (DescribeAddressIfGlobal(addr, access_size)) |
| return; |
| if (DescribeAddressIfStack(addr, access_size)) |
| return; |
| // Assume it is a heap address. |
| DescribeHeapAddress(addr, access_size); |
| } |
| |
| // ------------------- Thread description -------------------- {{{1 |
| |
| void DescribeThread(AsanThreadSummary *summary) { |
| CHECK(summary); |
| // No need to announce the main thread. |
| if (summary->tid() == 0 || summary->announced()) { |
| return; |
| } |
| summary->set_announced(true); |
| char tname[128]; |
| Printf("Thread T%d%s", summary->tid(), |
| ThreadNameWithParenthesis(summary->tid(), tname, sizeof(tname))); |
| Printf(" created by T%d%s here:\n", |
| summary->parent_tid(), |
| ThreadNameWithParenthesis(summary->parent_tid(), |
| tname, sizeof(tname))); |
| PrintStack(summary->stack()); |
| // Recursively described parent thread if needed. |
| if (flags()->print_full_thread_history) { |
| AsanThreadSummary *parent_summary = |
| asanThreadRegistry().FindByTid(summary->parent_tid()); |
| DescribeThread(parent_summary); |
| } |
| } |
| |
| // -------------------- Different kinds of reports ----------------- {{{1 |
| |
| // Use ScopedInErrorReport to run common actions just before and |
| // immediately after printing error report. |
| class ScopedInErrorReport { |
| public: |
| ScopedInErrorReport() { |
| static atomic_uint32_t num_calls; |
| static u32 reporting_thread_tid; |
| if (atomic_fetch_add(&num_calls, 1, memory_order_relaxed) != 0) { |
| // Do not print more than one report, otherwise they will mix up. |
| // Error reporting functions shouldn't return at this situation, as |
| // they are defined as no-return. |
| Report("AddressSanitizer: while reporting a bug found another one." |
| "Ignoring.\n"); |
| u32 current_tid = asanThreadRegistry().GetCurrentTidOrInvalid(); |
| if (current_tid != reporting_thread_tid) { |
| // ASan found two bugs in different threads simultaneously. Sleep |
| // long enough to make sure that the thread which started to print |
| // an error report will finish doing it. |
| SleepForSeconds(Max(100, flags()->sleep_before_dying + 1)); |
| } |
| // If we're still not dead for some reason, use raw _exit() instead of |
| // Die() to bypass any additional checks. |
| internal__exit(flags()->exitcode); |
| } |
| ASAN_ON_ERROR(); |
| reporting_thread_tid = asanThreadRegistry().GetCurrentTidOrInvalid(); |
| Printf("====================================================" |
| "=============\n"); |
| if (reporting_thread_tid != kInvalidTid) { |
| // We started reporting an error message. Stop using the fake stack |
| // in case we call an instrumented function from a symbolizer. |
| AsanThread *curr_thread = asanThreadRegistry().GetCurrent(); |
| CHECK(curr_thread); |
| curr_thread->fake_stack().StopUsingFakeStack(); |
| } |
| } |
| // Destructor is NORETURN, as functions that report errors are. |
| NORETURN ~ScopedInErrorReport() { |
| // Make sure the current thread is announced. |
| AsanThread *curr_thread = asanThreadRegistry().GetCurrent(); |
| if (curr_thread) { |
| DescribeThread(curr_thread->summary()); |
| } |
| // Print memory stats. |
| if (flags()->print_stats) |
| __asan_print_accumulated_stats(); |
| if (error_report_callback) { |
| error_report_callback(error_message_buffer); |
| } |
| Report("ABORTING\n"); |
| Die(); |
| } |
| }; |
| |
| static void ReportSummary(const char *error_type, StackTrace *stack) { |
| if (!stack->size) return; |
| if (IsSymbolizerAvailable()) { |
| AddressInfo ai; |
| // Currently, we include the first stack frame into the report summary. |
| // Maybe sometimes we need to choose another frame (e.g. skip memcpy/etc). |
| SymbolizeCode(stack->trace[0], &ai, 1); |
| ReportErrorSummary(error_type, |
| StripPathPrefix(ai.file, flags()->strip_path_prefix), |
| ai.line, ai.function); |
| } |
| // FIXME: do we need to print anything at all if there is no symbolizer? |
| } |
| |
| void ReportSIGSEGV(uptr pc, uptr sp, uptr bp, uptr addr) { |
| ScopedInErrorReport in_report; |
| Decorator d; |
| Printf("%s", d.Warning()); |
| Report("ERROR: AddressSanitizer: SEGV on unknown address %p" |
| " (pc %p sp %p bp %p T%d)\n", |
| (void*)addr, (void*)pc, (void*)sp, (void*)bp, |
| asanThreadRegistry().GetCurrentTidOrInvalid()); |
| Printf("%s", d.EndWarning()); |
| Printf("AddressSanitizer can not provide additional info.\n"); |
| GET_STACK_TRACE_FATAL(pc, bp); |
| PrintStack(&stack); |
| ReportSummary("SEGV", &stack); |
| } |
| |
| void ReportDoubleFree(uptr addr, StackTrace *stack) { |
| ScopedInErrorReport in_report; |
| Decorator d; |
| Printf("%s", d.Warning()); |
| Report("ERROR: AddressSanitizer: attempting double-free on %p:\n", addr); |
| Printf("%s", d.EndWarning()); |
| PrintStack(stack); |
| DescribeHeapAddress(addr, 1); |
| ReportSummary("double-free", stack); |
| } |
| |
| void ReportFreeNotMalloced(uptr addr, StackTrace *stack) { |
| ScopedInErrorReport in_report; |
| Decorator d; |
| Printf("%s", d.Warning()); |
| Report("ERROR: AddressSanitizer: attempting free on address " |
| "which was not malloc()-ed: %p\n", addr); |
| Printf("%s", d.EndWarning()); |
| PrintStack(stack); |
| DescribeHeapAddress(addr, 1); |
| ReportSummary("bad-free", stack); |
| } |
| |
| void ReportAllocTypeMismatch(uptr addr, StackTrace *stack, |
| AllocType alloc_type, |
| AllocType dealloc_type) { |
| static const char *alloc_names[] = |
| {"INVALID", "malloc", "operator new", "operator new []"}; |
| static const char *dealloc_names[] = |
| {"INVALID", "free", "operator delete", "operator delete []"}; |
| CHECK_NE(alloc_type, dealloc_type); |
| ScopedInErrorReport in_report; |
| Decorator d; |
| Printf("%s", d.Warning()); |
| Report("ERROR: AddressSanitizer: alloc-dealloc-mismatch (%s vs %s) on %p\n", |
| alloc_names[alloc_type], dealloc_names[dealloc_type], addr); |
| Printf("%s", d.EndWarning()); |
| PrintStack(stack); |
| DescribeHeapAddress(addr, 1); |
| ReportSummary("alloc-dealloc-mismatch", stack); |
| Report("HINT: if you don't care about these warnings you may set " |
| "ASAN_OPTIONS=alloc_dealloc_mismatch=0\n"); |
| } |
| |
| void ReportMallocUsableSizeNotOwned(uptr addr, StackTrace *stack) { |
| ScopedInErrorReport in_report; |
| Decorator d; |
| Printf("%s", d.Warning()); |
| Report("ERROR: AddressSanitizer: attempting to call " |
| "malloc_usable_size() for pointer which is " |
| "not owned: %p\n", addr); |
| Printf("%s", d.EndWarning()); |
| PrintStack(stack); |
| DescribeHeapAddress(addr, 1); |
| ReportSummary("bad-malloc_usable_size", stack); |
| } |
| |
| void ReportAsanGetAllocatedSizeNotOwned(uptr addr, StackTrace *stack) { |
| ScopedInErrorReport in_report; |
| Decorator d; |
| Printf("%s", d.Warning()); |
| Report("ERROR: AddressSanitizer: attempting to call " |
| "__asan_get_allocated_size() for pointer which is " |
| "not owned: %p\n", addr); |
| Printf("%s", d.EndWarning()); |
| PrintStack(stack); |
| DescribeHeapAddress(addr, 1); |
| ReportSummary("bad-__asan_get_allocated_size", stack); |
| } |
| |
| void ReportStringFunctionMemoryRangesOverlap( |
| const char *function, const char *offset1, uptr length1, |
| const char *offset2, uptr length2, StackTrace *stack) { |
| ScopedInErrorReport in_report; |
| Decorator d; |
| char bug_type[100]; |
| internal_snprintf(bug_type, sizeof(bug_type), "%s-param-overlap", function); |
| Printf("%s", d.Warning()); |
| Report("ERROR: AddressSanitizer: %s: " |
| "memory ranges [%p,%p) and [%p, %p) overlap\n", \ |
| bug_type, offset1, offset1 + length1, offset2, offset2 + length2); |
| Printf("%s", d.EndWarning()); |
| PrintStack(stack); |
| DescribeAddress((uptr)offset1, length1); |
| DescribeAddress((uptr)offset2, length2); |
| ReportSummary(bug_type, stack); |
| } |
| |
| // ----------------------- Mac-specific reports ----------------- {{{1 |
| |
| void WarnMacFreeUnallocated( |
| uptr addr, uptr zone_ptr, const char *zone_name, StackTrace *stack) { |
| // Just print a warning here. |
| Printf("free_common(%p) -- attempting to free unallocated memory.\n" |
| "AddressSanitizer is ignoring this error on Mac OS now.\n", |
| addr); |
| PrintZoneForPointer(addr, zone_ptr, zone_name); |
| PrintStack(stack); |
| DescribeHeapAddress(addr, 1); |
| } |
| |
| void ReportMacMzReallocUnknown( |
| uptr addr, uptr zone_ptr, const char *zone_name, StackTrace *stack) { |
| ScopedInErrorReport in_report; |
| Printf("mz_realloc(%p) -- attempting to realloc unallocated memory.\n" |
| "This is an unrecoverable problem, exiting now.\n", |
| addr); |
| PrintZoneForPointer(addr, zone_ptr, zone_name); |
| PrintStack(stack); |
| DescribeHeapAddress(addr, 1); |
| } |
| |
| void ReportMacCfReallocUnknown( |
| uptr addr, uptr zone_ptr, const char *zone_name, StackTrace *stack) { |
| ScopedInErrorReport in_report; |
| Printf("cf_realloc(%p) -- attempting to realloc unallocated memory.\n" |
| "This is an unrecoverable problem, exiting now.\n", |
| addr); |
| PrintZoneForPointer(addr, zone_ptr, zone_name); |
| PrintStack(stack); |
| DescribeHeapAddress(addr, 1); |
| } |
| |
| } // namespace __asan |
| |
| // --------------------------- Interface --------------------- {{{1 |
| using namespace __asan; // NOLINT |
| |
| void __asan_report_error(uptr pc, uptr bp, uptr sp, |
| uptr addr, bool is_write, uptr access_size) { |
| ScopedInErrorReport in_report; |
| |
| // Determine the error type. |
| const char *bug_descr = "unknown-crash"; |
| if (AddrIsInMem(addr)) { |
| u8 *shadow_addr = (u8*)MemToShadow(addr); |
| // If we are accessing 16 bytes, look at the second shadow byte. |
| if (*shadow_addr == 0 && access_size > SHADOW_GRANULARITY) |
| shadow_addr++; |
| // If we are in the partial right redzone, look at the next shadow byte. |
| if (*shadow_addr > 0 && *shadow_addr < 128) |
| shadow_addr++; |
| switch (*shadow_addr) { |
| case kAsanHeapLeftRedzoneMagic: |
| case kAsanHeapRightRedzoneMagic: |
| bug_descr = "heap-buffer-overflow"; |
| break; |
| case kAsanHeapFreeMagic: |
| bug_descr = "heap-use-after-free"; |
| break; |
| case kAsanStackLeftRedzoneMagic: |
| bug_descr = "stack-buffer-underflow"; |
| break; |
| case kAsanInitializationOrderMagic: |
| bug_descr = "initialization-order-fiasco"; |
| break; |
| case kAsanStackMidRedzoneMagic: |
| case kAsanStackRightRedzoneMagic: |
| case kAsanStackPartialRedzoneMagic: |
| bug_descr = "stack-buffer-overflow"; |
| break; |
| case kAsanStackAfterReturnMagic: |
| bug_descr = "stack-use-after-return"; |
| break; |
| case kAsanUserPoisonedMemoryMagic: |
| bug_descr = "use-after-poison"; |
| break; |
| case kAsanStackUseAfterScopeMagic: |
| bug_descr = "stack-use-after-scope"; |
| break; |
| case kAsanGlobalRedzoneMagic: |
| bug_descr = "global-buffer-overflow"; |
| break; |
| } |
| } |
| Decorator d; |
| Printf("%s", d.Warning()); |
| Report("ERROR: AddressSanitizer: %s on address " |
| "%p at pc 0x%zx bp 0x%zx sp 0x%zx\n", |
| bug_descr, (void*)addr, pc, bp, sp); |
| Printf("%s", d.EndWarning()); |
| |
| u32 curr_tid = asanThreadRegistry().GetCurrentTidOrInvalid(); |
| char tname[128]; |
| Printf("%s%s of size %zu at %p thread T%d%s%s\n", |
| d.Access(), |
| access_size ? (is_write ? "WRITE" : "READ") : "ACCESS", |
| access_size, (void*)addr, curr_tid, |
| ThreadNameWithParenthesis(curr_tid, tname, sizeof(tname)), |
| d.EndAccess()); |
| |
| GET_STACK_TRACE_FATAL(pc, bp); |
| PrintStack(&stack); |
| |
| DescribeAddress(addr, access_size); |
| ReportSummary(bug_descr, &stack); |
| PrintShadowMemoryForAddress(addr); |
| } |
| |
| void NOINLINE __asan_set_error_report_callback(void (*callback)(const char*)) { |
| error_report_callback = callback; |
| if (callback) { |
| error_message_buffer_size = 1 << 16; |
| error_message_buffer = |
| (char*)MmapOrDie(error_message_buffer_size, __FUNCTION__); |
| error_message_buffer_pos = 0; |
| } |
| } |
| |
| void __asan_describe_address(uptr addr) { |
| DescribeAddress(addr, 1); |
| } |
| |
| #if !SANITIZER_SUPPORTS_WEAK_HOOKS |
| // Provide default implementation of __asan_on_error that does nothing |
| // and may be overriden by user. |
| SANITIZER_WEAK_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE NOINLINE |
| void __asan_on_error() {} |
| #endif |
