mirror of
https://github.com/autc04/Retro68.git
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427 lines
14 KiB
C++
427 lines
14 KiB
C++
//===-- ubsan_diag.cc -----------------------------------------------------===//
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Diagnostic reporting for the UBSan runtime.
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//
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//===----------------------------------------------------------------------===//
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#include "ubsan_platform.h"
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#if CAN_SANITIZE_UB
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#include "ubsan_diag.h"
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#include "ubsan_init.h"
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#include "ubsan_flags.h"
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#include "sanitizer_common/sanitizer_placement_new.h"
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#include "sanitizer_common/sanitizer_report_decorator.h"
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#include "sanitizer_common/sanitizer_stacktrace.h"
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#include "sanitizer_common/sanitizer_stacktrace_printer.h"
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#include "sanitizer_common/sanitizer_suppressions.h"
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#include "sanitizer_common/sanitizer_symbolizer.h"
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#include <stdio.h>
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using namespace __ubsan;
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static void MaybePrintStackTrace(uptr pc, uptr bp) {
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// We assume that flags are already parsed, as UBSan runtime
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// will definitely be called when we print the first diagnostics message.
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if (!flags()->print_stacktrace)
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return;
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// We can only use slow unwind, as we don't have any information about stack
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// top/bottom.
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// FIXME: It's better to respect "fast_unwind_on_fatal" runtime flag and
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// fetch stack top/bottom information if we have it (e.g. if we're running
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// under ASan).
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if (StackTrace::WillUseFastUnwind(false))
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return;
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BufferedStackTrace stack;
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stack.Unwind(kStackTraceMax, pc, bp, 0, 0, 0, false);
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stack.Print();
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}
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static const char *ConvertTypeToString(ErrorType Type) {
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switch (Type) {
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#define UBSAN_CHECK(Name, SummaryKind, FSanitizeFlagName) \
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case ErrorType::Name: \
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return SummaryKind;
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#include "ubsan_checks.inc"
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#undef UBSAN_CHECK
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}
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UNREACHABLE("unknown ErrorType!");
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}
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static const char *ConvertTypeToFlagName(ErrorType Type) {
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switch (Type) {
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#define UBSAN_CHECK(Name, SummaryKind, FSanitizeFlagName) \
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case ErrorType::Name: \
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return FSanitizeFlagName;
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#include "ubsan_checks.inc"
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#undef UBSAN_CHECK
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}
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UNREACHABLE("unknown ErrorType!");
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}
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static void MaybeReportErrorSummary(Location Loc, ErrorType Type) {
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if (!common_flags()->print_summary)
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return;
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if (!flags()->report_error_type)
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Type = ErrorType::GenericUB;
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const char *ErrorKind = ConvertTypeToString(Type);
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if (Loc.isSourceLocation()) {
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SourceLocation SLoc = Loc.getSourceLocation();
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if (!SLoc.isInvalid()) {
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AddressInfo AI;
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AI.file = internal_strdup(SLoc.getFilename());
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AI.line = SLoc.getLine();
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AI.column = SLoc.getColumn();
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AI.function = internal_strdup(""); // Avoid printing ?? as function name.
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ReportErrorSummary(ErrorKind, AI);
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AI.Clear();
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return;
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}
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} else if (Loc.isSymbolizedStack()) {
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const AddressInfo &AI = Loc.getSymbolizedStack()->info;
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ReportErrorSummary(ErrorKind, AI);
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return;
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}
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ReportErrorSummary(ErrorKind);
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}
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namespace {
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class Decorator : public SanitizerCommonDecorator {
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public:
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Decorator() : SanitizerCommonDecorator() {}
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const char *Highlight() const { return Green(); }
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const char *EndHighlight() const { return Default(); }
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const char *Note() const { return Black(); }
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const char *EndNote() const { return Default(); }
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};
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}
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SymbolizedStack *__ubsan::getSymbolizedLocation(uptr PC) {
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InitAsStandaloneIfNecessary();
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return Symbolizer::GetOrInit()->SymbolizePC(PC);
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}
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Diag &Diag::operator<<(const TypeDescriptor &V) {
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return AddArg(V.getTypeName());
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}
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Diag &Diag::operator<<(const Value &V) {
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if (V.getType().isSignedIntegerTy())
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AddArg(V.getSIntValue());
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else if (V.getType().isUnsignedIntegerTy())
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AddArg(V.getUIntValue());
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else if (V.getType().isFloatTy())
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AddArg(V.getFloatValue());
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else
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AddArg("<unknown>");
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return *this;
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}
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/// Hexadecimal printing for numbers too large for Printf to handle directly.
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static void RenderHex(InternalScopedString *Buffer, UIntMax Val) {
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#if HAVE_INT128_T
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Buffer->append("0x%08x%08x%08x%08x", (unsigned int)(Val >> 96),
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(unsigned int)(Val >> 64), (unsigned int)(Val >> 32),
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(unsigned int)(Val));
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#else
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UNREACHABLE("long long smaller than 64 bits?");
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#endif
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}
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static void RenderLocation(InternalScopedString *Buffer, Location Loc) {
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switch (Loc.getKind()) {
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case Location::LK_Source: {
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SourceLocation SLoc = Loc.getSourceLocation();
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if (SLoc.isInvalid())
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Buffer->append("<unknown>");
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else
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RenderSourceLocation(Buffer, SLoc.getFilename(), SLoc.getLine(),
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SLoc.getColumn(), common_flags()->symbolize_vs_style,
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common_flags()->strip_path_prefix);
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return;
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}
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case Location::LK_Memory:
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Buffer->append("%p", Loc.getMemoryLocation());
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return;
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case Location::LK_Symbolized: {
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const AddressInfo &Info = Loc.getSymbolizedStack()->info;
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if (Info.file)
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RenderSourceLocation(Buffer, Info.file, Info.line, Info.column,
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common_flags()->symbolize_vs_style,
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common_flags()->strip_path_prefix);
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else if (Info.module)
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RenderModuleLocation(Buffer, Info.module, Info.module_offset,
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common_flags()->strip_path_prefix);
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else
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Buffer->append("%p", Info.address);
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return;
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}
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case Location::LK_Null:
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Buffer->append("<unknown>");
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return;
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}
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}
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static void RenderText(InternalScopedString *Buffer, const char *Message,
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const Diag::Arg *Args) {
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for (const char *Msg = Message; *Msg; ++Msg) {
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if (*Msg != '%') {
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Buffer->append("%c", *Msg);
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continue;
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}
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const Diag::Arg &A = Args[*++Msg - '0'];
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switch (A.Kind) {
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case Diag::AK_String:
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Buffer->append("%s", A.String);
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break;
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case Diag::AK_TypeName: {
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if (SANITIZER_WINDOWS)
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// The Windows implementation demangles names early.
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Buffer->append("'%s'", A.String);
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else
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Buffer->append("'%s'", Symbolizer::GetOrInit()->Demangle(A.String));
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break;
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}
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case Diag::AK_SInt:
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// 'long long' is guaranteed to be at least 64 bits wide.
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if (A.SInt >= INT64_MIN && A.SInt <= INT64_MAX)
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Buffer->append("%lld", (long long)A.SInt);
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else
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RenderHex(Buffer, A.SInt);
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break;
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case Diag::AK_UInt:
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if (A.UInt <= UINT64_MAX)
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Buffer->append("%llu", (unsigned long long)A.UInt);
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else
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RenderHex(Buffer, A.UInt);
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break;
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case Diag::AK_Float: {
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// FIXME: Support floating-point formatting in sanitizer_common's
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// printf, and stop using snprintf here.
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char FloatBuffer[32];
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#if SANITIZER_WINDOWS
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sprintf_s(FloatBuffer, sizeof(FloatBuffer), "%Lg", (long double)A.Float);
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#else
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snprintf(FloatBuffer, sizeof(FloatBuffer), "%Lg", (long double)A.Float);
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#endif
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Buffer->append("%s", FloatBuffer);
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break;
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}
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case Diag::AK_Pointer:
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Buffer->append("%p", A.Pointer);
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break;
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}
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}
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}
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/// Find the earliest-starting range in Ranges which ends after Loc.
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static Range *upperBound(MemoryLocation Loc, Range *Ranges,
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unsigned NumRanges) {
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Range *Best = 0;
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for (unsigned I = 0; I != NumRanges; ++I)
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if (Ranges[I].getEnd().getMemoryLocation() > Loc &&
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(!Best ||
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Best->getStart().getMemoryLocation() >
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Ranges[I].getStart().getMemoryLocation()))
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Best = &Ranges[I];
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return Best;
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}
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static inline uptr subtractNoOverflow(uptr LHS, uptr RHS) {
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return (LHS < RHS) ? 0 : LHS - RHS;
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}
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static inline uptr addNoOverflow(uptr LHS, uptr RHS) {
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const uptr Limit = (uptr)-1;
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return (LHS > Limit - RHS) ? Limit : LHS + RHS;
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}
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/// Render a snippet of the address space near a location.
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static void PrintMemorySnippet(const Decorator &Decor, MemoryLocation Loc,
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Range *Ranges, unsigned NumRanges,
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const Diag::Arg *Args) {
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// Show at least the 8 bytes surrounding Loc.
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const unsigned MinBytesNearLoc = 4;
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MemoryLocation Min = subtractNoOverflow(Loc, MinBytesNearLoc);
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MemoryLocation Max = addNoOverflow(Loc, MinBytesNearLoc);
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MemoryLocation OrigMin = Min;
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for (unsigned I = 0; I < NumRanges; ++I) {
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Min = __sanitizer::Min(Ranges[I].getStart().getMemoryLocation(), Min);
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Max = __sanitizer::Max(Ranges[I].getEnd().getMemoryLocation(), Max);
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}
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// If we have too many interesting bytes, prefer to show bytes after Loc.
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const unsigned BytesToShow = 32;
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if (Max - Min > BytesToShow)
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Min = __sanitizer::Min(Max - BytesToShow, OrigMin);
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Max = addNoOverflow(Min, BytesToShow);
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if (!IsAccessibleMemoryRange(Min, Max - Min)) {
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Printf("<memory cannot be printed>\n");
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return;
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}
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// Emit data.
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InternalScopedString Buffer(1024);
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for (uptr P = Min; P != Max; ++P) {
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unsigned char C = *reinterpret_cast<const unsigned char*>(P);
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Buffer.append("%s%02x", (P % 8 == 0) ? " " : " ", C);
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}
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Buffer.append("\n");
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// Emit highlights.
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Buffer.append(Decor.Highlight());
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Range *InRange = upperBound(Min, Ranges, NumRanges);
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for (uptr P = Min; P != Max; ++P) {
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char Pad = ' ', Byte = ' ';
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if (InRange && InRange->getEnd().getMemoryLocation() == P)
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InRange = upperBound(P, Ranges, NumRanges);
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if (!InRange && P > Loc)
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break;
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if (InRange && InRange->getStart().getMemoryLocation() < P)
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Pad = '~';
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if (InRange && InRange->getStart().getMemoryLocation() <= P)
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Byte = '~';
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if (P % 8 == 0)
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Buffer.append("%c", Pad);
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Buffer.append("%c", Pad);
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Buffer.append("%c", P == Loc ? '^' : Byte);
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Buffer.append("%c", Byte);
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}
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Buffer.append("%s\n", Decor.EndHighlight());
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// Go over the line again, and print names for the ranges.
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InRange = 0;
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unsigned Spaces = 0;
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for (uptr P = Min; P != Max; ++P) {
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if (!InRange || InRange->getEnd().getMemoryLocation() == P)
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InRange = upperBound(P, Ranges, NumRanges);
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if (!InRange)
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break;
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Spaces += (P % 8) == 0 ? 2 : 1;
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if (InRange && InRange->getStart().getMemoryLocation() == P) {
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while (Spaces--)
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Buffer.append(" ");
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RenderText(&Buffer, InRange->getText(), Args);
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Buffer.append("\n");
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// FIXME: We only support naming one range for now!
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break;
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}
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Spaces += 2;
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}
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Printf("%s", Buffer.data());
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// FIXME: Print names for anything we can identify within the line:
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//
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// * If we can identify the memory itself as belonging to a particular
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// global, stack variable, or dynamic allocation, then do so.
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//
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// * If we have a pointer-size, pointer-aligned range highlighted,
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// determine whether the value of that range is a pointer to an
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// entity which we can name, and if so, print that name.
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//
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// This needs an external symbolizer, or (preferably) ASan instrumentation.
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}
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Diag::~Diag() {
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// All diagnostics should be printed under report mutex.
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CommonSanitizerReportMutex.CheckLocked();
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Decorator Decor;
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InternalScopedString Buffer(1024);
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Buffer.append(Decor.Bold());
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RenderLocation(&Buffer, Loc);
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Buffer.append(":");
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switch (Level) {
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case DL_Error:
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Buffer.append("%s runtime error: %s%s", Decor.Warning(), Decor.EndWarning(),
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Decor.Bold());
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break;
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case DL_Note:
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Buffer.append("%s note: %s", Decor.Note(), Decor.EndNote());
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break;
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}
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RenderText(&Buffer, Message, Args);
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Buffer.append("%s\n", Decor.Default());
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Printf("%s", Buffer.data());
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if (Loc.isMemoryLocation())
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PrintMemorySnippet(Decor, Loc.getMemoryLocation(), Ranges, NumRanges, Args);
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}
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ScopedReport::ScopedReport(ReportOptions Opts, Location SummaryLoc,
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ErrorType Type)
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: Opts(Opts), SummaryLoc(SummaryLoc), Type(Type) {
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InitAsStandaloneIfNecessary();
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CommonSanitizerReportMutex.Lock();
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}
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ScopedReport::~ScopedReport() {
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MaybePrintStackTrace(Opts.pc, Opts.bp);
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MaybeReportErrorSummary(SummaryLoc, Type);
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CommonSanitizerReportMutex.Unlock();
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if (flags()->halt_on_error)
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Die();
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}
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ALIGNED(64) static char suppression_placeholder[sizeof(SuppressionContext)];
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static SuppressionContext *suppression_ctx = nullptr;
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static const char kVptrCheck[] = "vptr_check";
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static const char *kSuppressionTypes[] = {
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#define UBSAN_CHECK(Name, SummaryKind, FSanitizeFlagName) FSanitizeFlagName,
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#include "ubsan_checks.inc"
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#undef UBSAN_CHECK
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kVptrCheck,
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};
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void __ubsan::InitializeSuppressions() {
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CHECK_EQ(nullptr, suppression_ctx);
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suppression_ctx = new (suppression_placeholder) // NOLINT
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SuppressionContext(kSuppressionTypes, ARRAY_SIZE(kSuppressionTypes));
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suppression_ctx->ParseFromFile(flags()->suppressions);
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}
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bool __ubsan::IsVptrCheckSuppressed(const char *TypeName) {
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InitAsStandaloneIfNecessary();
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CHECK(suppression_ctx);
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Suppression *s;
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return suppression_ctx->Match(TypeName, kVptrCheck, &s);
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}
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bool __ubsan::IsPCSuppressed(ErrorType ET, uptr PC, const char *Filename) {
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InitAsStandaloneIfNecessary();
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CHECK(suppression_ctx);
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const char *SuppType = ConvertTypeToFlagName(ET);
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// Fast path: don't symbolize PC if there is no suppressions for given UB
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// type.
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if (!suppression_ctx->HasSuppressionType(SuppType))
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return false;
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Suppression *s = nullptr;
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// Suppress by file name known to runtime.
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if (Filename != nullptr && suppression_ctx->Match(Filename, SuppType, &s))
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return true;
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// Suppress by module name.
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if (const char *Module = Symbolizer::GetOrInit()->GetModuleNameForPc(PC)) {
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if (suppression_ctx->Match(Module, SuppType, &s))
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return true;
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}
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// Suppress by function or source file name from debug info.
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SymbolizedStackHolder Stack(Symbolizer::GetOrInit()->SymbolizePC(PC));
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const AddressInfo &AI = Stack.get()->info;
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return suppression_ctx->Match(AI.function, SuppType, &s) ||
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suppression_ctx->Match(AI.file, SuppType, &s);
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}
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#endif // CAN_SANITIZE_UB
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