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Diffstat (limited to 'lib/asan/asan_report.cc')
| -rw-r--r-- | lib/asan/asan_report.cc | 681 |
1 files changed, 681 insertions, 0 deletions
diff --git a/lib/asan/asan_report.cc b/lib/asan/asan_report.cc new file mode 100644 index 0000000000000..35ab9cabde671 --- /dev/null +++ b/lib/asan/asan_report.cc @@ -0,0 +1,681 @@ +//===-- 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 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); + } + 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 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, const __asan_global &g) { + if (addr < g.beg - kGlobalAndStackRedzone) return false; + if (addr >= g.beg + g.size_with_redzone) return false; + Decorator d; + Printf("%s", d.Location()); + Printf("%p is located ", (void*)addr); + if (addr < g.beg) { + Printf("%zd bytes to the left", g.beg - addr); + } else if (addr >= g.beg + g.size) { + Printf("%zd bytes to the right", addr - (g.beg + g.size)); + } else { + Printf("%zd bytes inside", addr - g.beg); // Can it happen? + } + Printf(" of global variable '%s' (0x%zx) of size %zu\n", + g.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) { + uptr offset; + Decorator d; + Printf("%s", d.Location()); + Printf("%p is located ", (void*)addr); + if (chunk.AddrIsInside(addr, access_size, &offset)) { + Printf("%zu bytes inside of", offset); + } else if (chunk.AddrIsAtLeft(addr, access_size, &offset)) { + Printf("%zu bytes to the left of", offset); + } else if (chunk.AddrIsAtRight(addr, access_size, &offset)) { + Printf("%zu bytes to the right of", offset); + } else { + Printf(" somewhere around (this is AddressSanitizer bug!)"); + } + 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)) + 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. + 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. + __asan_print_accumulated_stats(); + if (error_report_callback) { + error_report_callback(error_message_buffer); + } + Report("ABORTING\n"); + Die(); + } +}; + +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); +} + +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); +} + +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); +} + +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); + 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); +} + +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); +} + +void ReportStringFunctionMemoryRangesOverlap( + const char *function, const char *offset1, uptr length1, + const char *offset2, uptr length2, StackTrace *stack) { + ScopedInErrorReport in_report; + Decorator d; + Printf("%s", d.Warning()); + Report("ERROR: AddressSanitizer: %s-param-overlap: " + "memory ranges [%p,%p) and [%p, %p) overlap\n", \ + function, offset1, offset1 + length1, offset2, offset2 + length2); + Printf("%s", d.EndWarning()); + PrintStack(stack); + DescribeAddress((uptr)offset1, length1); + DescribeAddress((uptr)offset2, length2); +} + +// ----------------------- 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); + + 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 |