diff options
Diffstat (limited to 'contrib/compiler-rt/lib/sanitizer_common/sanitizer_common_libcdep.cc')
-rw-r--r-- | contrib/compiler-rt/lib/sanitizer_common/sanitizer_common_libcdep.cc | 258 |
1 files changed, 23 insertions, 235 deletions
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_common_libcdep.cc b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_common_libcdep.cc index 5cdfbbb275f7..796a054858bc 100644 --- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_common_libcdep.cc +++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_common_libcdep.cc @@ -11,76 +11,14 @@ // run-time libraries. //===----------------------------------------------------------------------===// -#include "sanitizer_common.h" - #include "sanitizer_allocator_interface.h" -#include "sanitizer_file.h" +#include "sanitizer_common.h" #include "sanitizer_flags.h" #include "sanitizer_procmaps.h" -#include "sanitizer_report_decorator.h" -#include "sanitizer_stackdepot.h" -#include "sanitizer_stacktrace.h" -#include "sanitizer_symbolizer.h" -#if SANITIZER_POSIX -#include "sanitizer_posix.h" -#endif namespace __sanitizer { -#if !SANITIZER_FUCHSIA - -bool ReportFile::SupportsColors() { - SpinMutexLock l(mu); - ReopenIfNecessary(); - return SupportsColoredOutput(fd); -} - -static INLINE bool ReportSupportsColors() { - return report_file.SupportsColors(); -} - -#else // SANITIZER_FUCHSIA - -// Fuchsia's logs always go through post-processing that handles colorization. -static INLINE bool ReportSupportsColors() { return true; } - -#endif // !SANITIZER_FUCHSIA - -bool ColorizeReports() { - // FIXME: Add proper Windows support to AnsiColorDecorator and re-enable color - // printing on Windows. - if (SANITIZER_WINDOWS) - return false; - - const char *flag = common_flags()->color; - return internal_strcmp(flag, "always") == 0 || - (internal_strcmp(flag, "auto") == 0 && ReportSupportsColors()); -} - -static void (*sandboxing_callback)(); -void SetSandboxingCallback(void (*f)()) { - sandboxing_callback = f; -} - -void ReportErrorSummary(const char *error_type, const StackTrace *stack, - const char *alt_tool_name) { -#if !SANITIZER_GO - if (!common_flags()->print_summary) - return; - if (stack->size == 0) { - ReportErrorSummary(error_type); - return; - } - // Currently, we include the first stack frame into the report summary. - // Maybe sometimes we need to choose another frame (e.g. skip memcpy/etc). - uptr pc = StackTrace::GetPreviousInstructionPc(stack->trace[0]); - SymbolizedStack *frame = Symbolizer::GetOrInit()->SymbolizePC(pc); - ReportErrorSummary(error_type, frame->info, alt_tool_name); - frame->ClearAll(); -#endif -} - static void (*SoftRssLimitExceededCallback)(bool exceeded); void SetSoftRssLimitExceededCallback(void (*Callback)(bool exceeded)) { CHECK_EQ(SoftRssLimitExceededCallback, nullptr); @@ -88,17 +26,22 @@ void SetSoftRssLimitExceededCallback(void (*Callback)(bool exceeded)) { } #if SANITIZER_LINUX && !SANITIZER_GO +// Weak default implementation for when sanitizer_stackdepot is not linked in. +SANITIZER_WEAK_ATTRIBUTE StackDepotStats *StackDepotGetStats() { + return nullptr; +} + void BackgroundThread(void *arg) { - uptr hard_rss_limit_mb = common_flags()->hard_rss_limit_mb; - uptr soft_rss_limit_mb = common_flags()->soft_rss_limit_mb; - bool heap_profile = common_flags()->heap_profile; + const uptr hard_rss_limit_mb = common_flags()->hard_rss_limit_mb; + const uptr soft_rss_limit_mb = common_flags()->soft_rss_limit_mb; + const bool heap_profile = common_flags()->heap_profile; uptr prev_reported_rss = 0; uptr prev_reported_stack_depot_size = 0; bool reached_soft_rss_limit = false; uptr rss_during_last_reported_profile = 0; while (true) { SleepForMillis(100); - uptr current_rss_mb = GetRSS() >> 20; + const uptr current_rss_mb = GetRSS() >> 20; if (Verbosity()) { // If RSS has grown 10% since last time, print some information. if (prev_reported_rss * 11 / 10 < current_rss_mb) { @@ -107,13 +50,15 @@ void BackgroundThread(void *arg) { } // If stack depot has grown 10% since last time, print it too. StackDepotStats *stack_depot_stats = StackDepotGetStats(); - if (prev_reported_stack_depot_size * 11 / 10 < - stack_depot_stats->allocated) { - Printf("%s: StackDepot: %zd ids; %zdM allocated\n", - SanitizerToolName, - stack_depot_stats->n_uniq_ids, - stack_depot_stats->allocated >> 20); - prev_reported_stack_depot_size = stack_depot_stats->allocated; + if (stack_depot_stats) { + if (prev_reported_stack_depot_size * 11 / 10 < + stack_depot_stats->allocated) { + Printf("%s: StackDepot: %zd ids; %zdM allocated\n", + SanitizerToolName, + stack_depot_stats->n_uniq_ids, + stack_depot_stats->allocated >> 20); + prev_reported_stack_depot_size = stack_depot_stats->allocated; + } } } // Check RSS against the limit. @@ -147,127 +92,6 @@ void BackgroundThread(void *arg) { } #endif -#if !SANITIZER_FUCHSIA && !SANITIZER_GO -void StartReportDeadlySignal() { - // Write the first message using fd=2, just in case. - // It may actually fail to write in case stderr is closed. - CatastrophicErrorWrite(SanitizerToolName, internal_strlen(SanitizerToolName)); - static const char kDeadlySignal[] = ":DEADLYSIGNAL\n"; - CatastrophicErrorWrite(kDeadlySignal, sizeof(kDeadlySignal) - 1); -} - -static void MaybeReportNonExecRegion(uptr pc) { -#if SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD - MemoryMappingLayout proc_maps(/*cache_enabled*/ true); - MemoryMappedSegment segment; - while (proc_maps.Next(&segment)) { - if (pc >= segment.start && pc < segment.end && !segment.IsExecutable()) - Report("Hint: PC is at a non-executable region. Maybe a wild jump?\n"); - } -#endif -} - -static void PrintMemoryByte(InternalScopedString *str, const char *before, - u8 byte) { - SanitizerCommonDecorator d; - str->append("%s%s%x%x%s ", before, d.MemoryByte(), byte >> 4, byte & 15, - d.Default()); -} - -static void MaybeDumpInstructionBytes(uptr pc) { - if (!common_flags()->dump_instruction_bytes || (pc < GetPageSizeCached())) - return; - InternalScopedString str(1024); - str.append("First 16 instruction bytes at pc: "); - if (IsAccessibleMemoryRange(pc, 16)) { - for (int i = 0; i < 16; ++i) { - PrintMemoryByte(&str, "", ((u8 *)pc)[i]); - } - str.append("\n"); - } else { - str.append("unaccessible\n"); - } - Report("%s", str.data()); -} - -static void MaybeDumpRegisters(void *context) { - if (!common_flags()->dump_registers) return; - SignalContext::DumpAllRegisters(context); -} - -static void ReportStackOverflowImpl(const SignalContext &sig, u32 tid, - UnwindSignalStackCallbackType unwind, - const void *unwind_context) { - SanitizerCommonDecorator d; - Printf("%s", d.Warning()); - static const char kDescription[] = "stack-overflow"; - Report("ERROR: %s: %s on address %p (pc %p bp %p sp %p T%d)\n", - SanitizerToolName, kDescription, (void *)sig.addr, (void *)sig.pc, - (void *)sig.bp, (void *)sig.sp, tid); - Printf("%s", d.Default()); - InternalScopedBuffer<BufferedStackTrace> stack_buffer(1); - BufferedStackTrace *stack = stack_buffer.data(); - stack->Reset(); - unwind(sig, unwind_context, stack); - stack->Print(); - ReportErrorSummary(kDescription, stack); -} - -static void ReportDeadlySignalImpl(const SignalContext &sig, u32 tid, - UnwindSignalStackCallbackType unwind, - const void *unwind_context) { - SanitizerCommonDecorator d; - Printf("%s", d.Warning()); - const char *description = sig.Describe(); - Report("ERROR: %s: %s on unknown address %p (pc %p bp %p sp %p T%d)\n", - SanitizerToolName, description, (void *)sig.addr, (void *)sig.pc, - (void *)sig.bp, (void *)sig.sp, tid); - Printf("%s", d.Default()); - if (sig.pc < GetPageSizeCached()) - Report("Hint: pc points to the zero page.\n"); - if (sig.is_memory_access) { - const char *access_type = - sig.write_flag == SignalContext::WRITE - ? "WRITE" - : (sig.write_flag == SignalContext::READ ? "READ" : "UNKNOWN"); - Report("The signal is caused by a %s memory access.\n", access_type); - if (sig.addr < GetPageSizeCached()) - Report("Hint: address points to the zero page.\n"); - } - MaybeReportNonExecRegion(sig.pc); - InternalScopedBuffer<BufferedStackTrace> stack_buffer(1); - BufferedStackTrace *stack = stack_buffer.data(); - stack->Reset(); - unwind(sig, unwind_context, stack); - stack->Print(); - MaybeDumpInstructionBytes(sig.pc); - MaybeDumpRegisters(sig.context); - Printf("%s can not provide additional info.\n", SanitizerToolName); - ReportErrorSummary(description, stack); -} - -void ReportDeadlySignal(const SignalContext &sig, u32 tid, - UnwindSignalStackCallbackType unwind, - const void *unwind_context) { - if (sig.IsStackOverflow()) - ReportStackOverflowImpl(sig, tid, unwind, unwind_context); - else - ReportDeadlySignalImpl(sig, tid, unwind, unwind_context); -} - -void HandleDeadlySignal(void *siginfo, void *context, u32 tid, - UnwindSignalStackCallbackType unwind, - const void *unwind_context) { - StartReportDeadlySignal(); - ScopedErrorReportLock rl; - SignalContext sig(siginfo, context); - ReportDeadlySignal(sig, tid, unwind, unwind_context); - Report("ABORTING\n"); - Die(); -} - -#endif // !SANITIZER_FUCHSIA && !SANITIZER_GO - void WriteToSyslog(const char *msg) { InternalScopedString msg_copy(kErrorMessageBufferSize); msg_copy.append("%s", msg); @@ -298,52 +122,16 @@ void MaybeStartBackgroudThread() { #endif } -static atomic_uintptr_t reporting_thread = {0}; -static StaticSpinMutex CommonSanitizerReportMutex; - -ScopedErrorReportLock::ScopedErrorReportLock() { - uptr current = GetThreadSelf(); - for (;;) { - uptr expected = 0; - if (atomic_compare_exchange_strong(&reporting_thread, &expected, current, - memory_order_relaxed)) { - // We've claimed reporting_thread so proceed. - CommonSanitizerReportMutex.Lock(); - return; - } - - if (expected == current) { - // This is either asynch signal or nested error during error reporting. - // Fail simple to avoid deadlocks in Report(). - - // Can't use Report() here because of potential deadlocks in nested - // signal handlers. - CatastrophicErrorWrite(SanitizerToolName, - internal_strlen(SanitizerToolName)); - static const char msg[] = ": nested bug in the same thread, aborting.\n"; - CatastrophicErrorWrite(msg, sizeof(msg) - 1); - - internal__exit(common_flags()->exitcode); - } - - internal_sched_yield(); - } -} - -ScopedErrorReportLock::~ScopedErrorReportLock() { - CommonSanitizerReportMutex.Unlock(); - atomic_store_relaxed(&reporting_thread, 0); -} - -void ScopedErrorReportLock::CheckLocked() { - CommonSanitizerReportMutex.CheckLocked(); +static void (*sandboxing_callback)(); +void SetSandboxingCallback(void (*f)()) { + sandboxing_callback = f; } } // namespace __sanitizer SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_sandbox_on_notify, __sanitizer_sandbox_arguments *args) { - __sanitizer::PrepareForSandboxing(args); + __sanitizer::PlatformPrepareForSandboxing(args); if (__sanitizer::sandboxing_callback) __sanitizer::sandboxing_callback(); } |