| //===-- ubsan_handlers.cpp ------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // Error logging entry points for the UBSan runtime. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "ubsan_platform.h" |
| #if CAN_SANITIZE_UB |
| #include "ubsan_handlers.h" |
| #include "ubsan_diag.h" |
| #include "ubsan_flags.h" |
| #include "ubsan_monitor.h" |
| #include "ubsan_value.h" |
| |
| #include "sanitizer_common/sanitizer_common.h" |
| |
| using namespace __sanitizer; |
| using namespace __ubsan; |
| |
| namespace __ubsan { |
| bool ignoreReport(SourceLocation SLoc, ReportOptions Opts, ErrorType ET) { |
| // We are not allowed to skip error report: if we are in unrecoverable |
| // handler, we have to terminate the program right now, and therefore |
| // have to print some diagnostic. |
| // |
| // Even if source location is disabled, it doesn't mean that we have |
| // already report an error to the user: some concurrently running |
| // thread could have acquired it, but not yet printed the report. |
| if (Opts.FromUnrecoverableHandler) |
| return false; |
| return SLoc.isDisabled() || IsPCSuppressed(ET, Opts.pc, SLoc.getFilename()); |
| } |
| |
| /// Situations in which we might emit a check for the suitability of a |
| /// pointer or glvalue. Needs to be kept in sync with CodeGenFunction.h in |
| /// clang. |
| enum TypeCheckKind { |
| /// Checking the operand of a load. Must be suitably sized and aligned. |
| TCK_Load, |
| /// Checking the destination of a store. Must be suitably sized and aligned. |
| TCK_Store, |
| /// Checking the bound value in a reference binding. Must be suitably sized |
| /// and aligned, but is not required to refer to an object (until the |
| /// reference is used), per core issue 453. |
| TCK_ReferenceBinding, |
| /// Checking the object expression in a non-static data member access. Must |
| /// be an object within its lifetime. |
| TCK_MemberAccess, |
| /// Checking the 'this' pointer for a call to a non-static member function. |
| /// Must be an object within its lifetime. |
| TCK_MemberCall, |
| /// Checking the 'this' pointer for a constructor call. |
| TCK_ConstructorCall, |
| /// Checking the operand of a static_cast to a derived pointer type. Must be |
| /// null or an object within its lifetime. |
| TCK_DowncastPointer, |
| /// Checking the operand of a static_cast to a derived reference type. Must |
| /// be an object within its lifetime. |
| TCK_DowncastReference, |
| /// Checking the operand of a cast to a base object. Must be suitably sized |
| /// and aligned. |
| TCK_Upcast, |
| /// Checking the operand of a cast to a virtual base object. Must be an |
| /// object within its lifetime. |
| TCK_UpcastToVirtualBase, |
| /// Checking the value assigned to a _Nonnull pointer. Must not be null. |
| TCK_NonnullAssign, |
| /// Checking the operand of a dynamic_cast or a typeid expression. Must be |
| /// null or an object within its lifetime. |
| TCK_DynamicOperation |
| }; |
| |
| const char *TypeCheckKinds[] = { |
| "load of", "store to", "reference binding to", "member access within", |
| "member call on", "constructor call on", "downcast of", "downcast of", |
| "upcast of", "cast to virtual base of", "_Nonnull binding to", |
| "dynamic operation on"}; |
| } |
| |
| static void handleTypeMismatchImpl(TypeMismatchData *Data, ValueHandle Pointer, |
| ReportOptions Opts) { |
| Location Loc = Data->Loc.acquire(); |
| |
| uptr Alignment = (uptr)1 << Data->LogAlignment; |
| ErrorType ET; |
| if (!Pointer) |
| ET = (Data->TypeCheckKind == TCK_NonnullAssign) |
| ? ErrorType::NullPointerUseWithNullability |
| : ErrorType::NullPointerUse; |
| else if (Pointer & (Alignment - 1)) |
| ET = ErrorType::MisalignedPointerUse; |
| else |
| ET = ErrorType::InsufficientObjectSize; |
| |
| // Use the SourceLocation from Data to track deduplication, even if it's |
| // invalid. |
| if (ignoreReport(Loc.getSourceLocation(), Opts, ET)) |
| return; |
| |
| SymbolizedStackHolder FallbackLoc; |
| if (Data->Loc.isInvalid()) { |
| FallbackLoc.reset(getCallerLocation(Opts.pc)); |
| Loc = FallbackLoc; |
| } |
| |
| ScopedReport R(Opts, Loc, ET); |
| |
| switch (ET) { |
| case ErrorType::NullPointerUse: |
| case ErrorType::NullPointerUseWithNullability: |
| Diag(Loc, DL_Error, ET, "%0 null pointer of type %1") |
| << TypeCheckKinds[Data->TypeCheckKind] << Data->Type; |
| break; |
| case ErrorType::MisalignedPointerUse: |
| Diag(Loc, DL_Error, ET, "%0 misaligned address %1 for type %3, " |
| "which requires %2 byte alignment") |
| << TypeCheckKinds[Data->TypeCheckKind] << (void *)Pointer << Alignment |
| << Data->Type; |
| break; |
| case ErrorType::InsufficientObjectSize: |
| Diag(Loc, DL_Error, ET, "%0 address %1 with insufficient space " |
| "for an object of type %2") |
| << TypeCheckKinds[Data->TypeCheckKind] << (void *)Pointer << Data->Type; |
| break; |
| default: |
| UNREACHABLE("unexpected error type!"); |
| } |
| |
| if (Pointer) |
| Diag(Pointer, DL_Note, ET, "pointer points here"); |
| } |
| |
| void __ubsan::__ubsan_handle_type_mismatch_v1(TypeMismatchData *Data, |
| ValueHandle Pointer) { |
| GET_REPORT_OPTIONS(false); |
| handleTypeMismatchImpl(Data, Pointer, Opts); |
| } |
| void __ubsan::__ubsan_handle_type_mismatch_v1_abort(TypeMismatchData *Data, |
| ValueHandle Pointer) { |
| GET_REPORT_OPTIONS(true); |
| handleTypeMismatchImpl(Data, Pointer, Opts); |
| Die(); |
| } |
| |
| static void handleAlignmentAssumptionImpl(AlignmentAssumptionData *Data, |
| ValueHandle Pointer, |
| ValueHandle Alignment, |
| ValueHandle Offset, |
| ReportOptions Opts) { |
| Location Loc = Data->Loc.acquire(); |
| SourceLocation AssumptionLoc = Data->AssumptionLoc.acquire(); |
| |
| ErrorType ET = ErrorType::AlignmentAssumption; |
| |
| if (ignoreReport(Loc.getSourceLocation(), Opts, ET)) |
| return; |
| |
| ScopedReport R(Opts, Loc, ET); |
| |
| uptr RealPointer = Pointer - Offset; |
| uptr LSB = LeastSignificantSetBitIndex(RealPointer); |
| uptr ActualAlignment = uptr(1) << LSB; |
| |
| uptr Mask = Alignment - 1; |
| uptr MisAlignmentOffset = RealPointer & Mask; |
| |
| if (!Offset) { |
| Diag(Loc, DL_Error, ET, |
| "assumption of %0 byte alignment for pointer of type %1 failed") |
| << Alignment << Data->Type; |
| } else { |
| Diag(Loc, DL_Error, ET, |
| "assumption of %0 byte alignment (with offset of %1 byte) for pointer " |
| "of type %2 failed") |
| << Alignment << Offset << Data->Type; |
| } |
| |
| if (!AssumptionLoc.isInvalid()) |
| Diag(AssumptionLoc, DL_Note, ET, "alignment assumption was specified here"); |
| |
| Diag(RealPointer, DL_Note, ET, |
| "%0address is %1 aligned, misalignment offset is %2 bytes") |
| << (Offset ? "offset " : "") << ActualAlignment << MisAlignmentOffset; |
| } |
| |
| void __ubsan::__ubsan_handle_alignment_assumption(AlignmentAssumptionData *Data, |
| ValueHandle Pointer, |
| ValueHandle Alignment, |
| ValueHandle Offset) { |
| GET_REPORT_OPTIONS(false); |
| handleAlignmentAssumptionImpl(Data, Pointer, Alignment, Offset, Opts); |
| } |
| void __ubsan::__ubsan_handle_alignment_assumption_abort( |
| AlignmentAssumptionData *Data, ValueHandle Pointer, ValueHandle Alignment, |
| ValueHandle Offset) { |
| GET_REPORT_OPTIONS(true); |
| handleAlignmentAssumptionImpl(Data, Pointer, Alignment, Offset, Opts); |
| Die(); |
| } |
| |
| /// \brief Common diagnostic emission for various forms of integer overflow. |
| template <typename T> |
| static void handleIntegerOverflowImpl(OverflowData *Data, ValueHandle LHS, |
| const char *Operator, T RHS, |
| ReportOptions Opts) { |
| SourceLocation Loc = Data->Loc.acquire(); |
| bool IsSigned = Data->Type.isSignedIntegerTy(); |
| ErrorType ET = IsSigned ? ErrorType::SignedIntegerOverflow |
| : ErrorType::UnsignedIntegerOverflow; |
| |
| if (ignoreReport(Loc, Opts, ET)) |
| return; |
| |
| // If this is an unsigned overflow in non-fatal mode, potentially ignore it. |
| if (!IsSigned && !Opts.FromUnrecoverableHandler && |
| flags()->silence_unsigned_overflow) |
| return; |
| |
| ScopedReport R(Opts, Loc, ET); |
| |
| Diag(Loc, DL_Error, ET, "%0 integer overflow: " |
| "%1 %2 %3 cannot be represented in type %4") |
| << (IsSigned ? "signed" : "unsigned") << Value(Data->Type, LHS) |
| << Operator << RHS << Data->Type; |
| } |
| |
| #define UBSAN_OVERFLOW_HANDLER(handler_name, op, unrecoverable) \ |
| void __ubsan::handler_name(OverflowData *Data, ValueHandle LHS, \ |
| ValueHandle RHS) { \ |
| GET_REPORT_OPTIONS(unrecoverable); \ |
| handleIntegerOverflowImpl(Data, LHS, op, Value(Data->Type, RHS), Opts); \ |
| if (unrecoverable) \ |
| Die(); \ |
| } |
| |
| UBSAN_OVERFLOW_HANDLER(__ubsan_handle_add_overflow, "+", false) |
| UBSAN_OVERFLOW_HANDLER(__ubsan_handle_add_overflow_abort, "+", true) |
| UBSAN_OVERFLOW_HANDLER(__ubsan_handle_sub_overflow, "-", false) |
| UBSAN_OVERFLOW_HANDLER(__ubsan_handle_sub_overflow_abort, "-", true) |
| UBSAN_OVERFLOW_HANDLER(__ubsan_handle_mul_overflow, "*", false) |
| UBSAN_OVERFLOW_HANDLER(__ubsan_handle_mul_overflow_abort, "*", true) |
| |
| static void handleNegateOverflowImpl(OverflowData *Data, ValueHandle OldVal, |
| ReportOptions Opts) { |
| SourceLocation Loc = Data->Loc.acquire(); |
| bool IsSigned = Data->Type.isSignedIntegerTy(); |
| ErrorType ET = IsSigned ? ErrorType::SignedIntegerOverflow |
| : ErrorType::UnsignedIntegerOverflow; |
| |
| if (ignoreReport(Loc, Opts, ET)) |
| return; |
| |
| if (!IsSigned && flags()->silence_unsigned_overflow) |
| return; |
| |
| ScopedReport R(Opts, Loc, ET); |
| |
| if (IsSigned) |
| Diag(Loc, DL_Error, ET, |
| "negation of %0 cannot be represented in type %1; " |
| "cast to an unsigned type to negate this value to itself") |
| << Value(Data->Type, OldVal) << Data->Type; |
| else |
| Diag(Loc, DL_Error, ET, "negation of %0 cannot be represented in type %1") |
| << Value(Data->Type, OldVal) << Data->Type; |
| } |
| |
| void __ubsan::__ubsan_handle_negate_overflow(OverflowData *Data, |
| ValueHandle OldVal) { |
| GET_REPORT_OPTIONS(false); |
| handleNegateOverflowImpl(Data, OldVal, Opts); |
| } |
| void __ubsan::__ubsan_handle_negate_overflow_abort(OverflowData *Data, |
| ValueHandle OldVal) { |
| GET_REPORT_OPTIONS(true); |
| handleNegateOverflowImpl(Data, OldVal, Opts); |
| Die(); |
| } |
| |
| static void handleDivremOverflowImpl(OverflowData *Data, ValueHandle LHS, |
| ValueHandle RHS, ReportOptions Opts) { |
| SourceLocation Loc = Data->Loc.acquire(); |
| Value LHSVal(Data->Type, LHS); |
| Value RHSVal(Data->Type, RHS); |
| |
| ErrorType ET; |
| if (RHSVal.isMinusOne()) |
| ET = ErrorType::SignedIntegerOverflow; |
| else if (Data->Type.isIntegerTy()) |
| ET = ErrorType::IntegerDivideByZero; |
| else |
| ET = ErrorType::FloatDivideByZero; |
| |
| if (ignoreReport(Loc, Opts, ET)) |
| return; |
| |
| ScopedReport R(Opts, Loc, ET); |
| |
| switch (ET) { |
| case ErrorType::SignedIntegerOverflow: |
| Diag(Loc, DL_Error, ET, |
| "division of %0 by -1 cannot be represented in type %1") |
| << LHSVal << Data->Type; |
| break; |
| default: |
| Diag(Loc, DL_Error, ET, "division by zero"); |
| break; |
| } |
| } |
| |
| void __ubsan::__ubsan_handle_divrem_overflow(OverflowData *Data, |
| ValueHandle LHS, ValueHandle RHS) { |
| GET_REPORT_OPTIONS(false); |
| handleDivremOverflowImpl(Data, LHS, RHS, Opts); |
| } |
| void __ubsan::__ubsan_handle_divrem_overflow_abort(OverflowData *Data, |
| ValueHandle LHS, |
| ValueHandle RHS) { |
| GET_REPORT_OPTIONS(true); |
| handleDivremOverflowImpl(Data, LHS, RHS, Opts); |
| Die(); |
| } |
| |
| static void handleShiftOutOfBoundsImpl(ShiftOutOfBoundsData *Data, |
| ValueHandle LHS, ValueHandle RHS, |
| ReportOptions Opts) { |
| SourceLocation Loc = Data->Loc.acquire(); |
| Value LHSVal(Data->LHSType, LHS); |
| Value RHSVal(Data->RHSType, RHS); |
| |
| ErrorType ET; |
| if (RHSVal.isNegative() || |
| RHSVal.getPositiveIntValue() >= Data->LHSType.getIntegerBitWidth()) |
| ET = ErrorType::InvalidShiftExponent; |
| else |
| ET = ErrorType::InvalidShiftBase; |
| |
| if (ignoreReport(Loc, Opts, ET)) |
| return; |
| |
| ScopedReport R(Opts, Loc, ET); |
| |
| if (ET == ErrorType::InvalidShiftExponent) { |
| if (RHSVal.isNegative()) |
| Diag(Loc, DL_Error, ET, "shift exponent %0 is negative") << RHSVal; |
| else |
| Diag(Loc, DL_Error, ET, |
| "shift exponent %0 is too large for %1-bit type %2") |
| << RHSVal << Data->LHSType.getIntegerBitWidth() << Data->LHSType; |
| } else { |
| if (LHSVal.isNegative()) |
| Diag(Loc, DL_Error, ET, "left shift of negative value %0") << LHSVal; |
| else |
| Diag(Loc, DL_Error, ET, |
| "left shift of %0 by %1 places cannot be represented in type %2") |
| << LHSVal << RHSVal << Data->LHSType; |
| } |
| } |
| |
| void __ubsan::__ubsan_handle_shift_out_of_bounds(ShiftOutOfBoundsData *Data, |
| ValueHandle LHS, |
| ValueHandle RHS) { |
| GET_REPORT_OPTIONS(false); |
| handleShiftOutOfBoundsImpl(Data, LHS, RHS, Opts); |
| } |
| void __ubsan::__ubsan_handle_shift_out_of_bounds_abort( |
| ShiftOutOfBoundsData *Data, |
| ValueHandle LHS, |
| ValueHandle RHS) { |
| GET_REPORT_OPTIONS(true); |
| handleShiftOutOfBoundsImpl(Data, LHS, RHS, Opts); |
| Die(); |
| } |
| |
| static void handleOutOfBoundsImpl(OutOfBoundsData *Data, ValueHandle Index, |
| ReportOptions Opts) { |
| SourceLocation Loc = Data->Loc.acquire(); |
| ErrorType ET = ErrorType::OutOfBoundsIndex; |
| |
| if (ignoreReport(Loc, Opts, ET)) |
| return; |
| |
| ScopedReport R(Opts, Loc, ET); |
| |
| Value IndexVal(Data->IndexType, Index); |
| Diag(Loc, DL_Error, ET, "index %0 out of bounds for type %1") |
| << IndexVal << Data->ArrayType; |
| } |
| |
| void __ubsan::__ubsan_handle_out_of_bounds(OutOfBoundsData *Data, |
| ValueHandle Index) { |
| GET_REPORT_OPTIONS(false); |
| handleOutOfBoundsImpl(Data, Index, Opts); |
| } |
| void __ubsan::__ubsan_handle_out_of_bounds_abort(OutOfBoundsData *Data, |
| ValueHandle Index) { |
| GET_REPORT_OPTIONS(true); |
| handleOutOfBoundsImpl(Data, Index, Opts); |
| Die(); |
| } |
| |
| static void handleBuiltinUnreachableImpl(UnreachableData *Data, |
| ReportOptions Opts) { |
| ErrorType ET = ErrorType::UnreachableCall; |
| ScopedReport R(Opts, Data->Loc, ET); |
| Diag(Data->Loc, DL_Error, ET, |
| "execution reached an unreachable program point"); |
| } |
| |
| void __ubsan::__ubsan_handle_builtin_unreachable(UnreachableData *Data) { |
| GET_REPORT_OPTIONS(true); |
| handleBuiltinUnreachableImpl(Data, Opts); |
| Die(); |
| } |
| |
| static void handleMissingReturnImpl(UnreachableData *Data, ReportOptions Opts) { |
| ErrorType ET = ErrorType::MissingReturn; |
| ScopedReport R(Opts, Data->Loc, ET); |
| Diag(Data->Loc, DL_Error, ET, |
| "execution reached the end of a value-returning function " |
| "without returning a value"); |
| } |
| |
| void __ubsan::__ubsan_handle_missing_return(UnreachableData *Data) { |
| GET_REPORT_OPTIONS(true); |
| handleMissingReturnImpl(Data, Opts); |
| Die(); |
| } |
| |
| static void handleVLABoundNotPositive(VLABoundData *Data, ValueHandle Bound, |
| ReportOptions Opts) { |
| SourceLocation Loc = Data->Loc.acquire(); |
| ErrorType ET = ErrorType::NonPositiveVLAIndex; |
| |
| if (ignoreReport(Loc, Opts, ET)) |
| return; |
| |
| ScopedReport R(Opts, Loc, ET); |
| |
| Diag(Loc, DL_Error, ET, "variable length array bound evaluates to " |
| "non-positive value %0") |
| << Value(Data->Type, Bound); |
| } |
| |
| void __ubsan::__ubsan_handle_vla_bound_not_positive(VLABoundData *Data, |
| ValueHandle Bound) { |
| GET_REPORT_OPTIONS(false); |
| handleVLABoundNotPositive(Data, Bound, Opts); |
| } |
| void __ubsan::__ubsan_handle_vla_bound_not_positive_abort(VLABoundData *Data, |
| ValueHandle Bound) { |
| GET_REPORT_OPTIONS(true); |
| handleVLABoundNotPositive(Data, Bound, Opts); |
| Die(); |
| } |
| |
| static bool looksLikeFloatCastOverflowDataV1(void *Data) { |
| // First field is either a pointer to filename or a pointer to a |
| // TypeDescriptor. |
| u8 *FilenameOrTypeDescriptor; |
| internal_memcpy(&FilenameOrTypeDescriptor, Data, |
| sizeof(FilenameOrTypeDescriptor)); |
| |
| // Heuristic: For float_cast_overflow, the TypeKind will be either TK_Integer |
| // (0x0), TK_Float (0x1) or TK_Unknown (0xff). If both types are known, |
| // adding both bytes will be 0 or 1 (for BE or LE). If it were a filename, |
| // adding two printable characters will not yield such a value. Otherwise, |
| // if one of them is 0xff, this is most likely TK_Unknown type descriptor. |
| u16 MaybeFromTypeKind = |
| FilenameOrTypeDescriptor[0] + FilenameOrTypeDescriptor[1]; |
| return MaybeFromTypeKind < 2 || FilenameOrTypeDescriptor[0] == 0xff || |
| FilenameOrTypeDescriptor[1] == 0xff; |
| } |
| |
| static void handleFloatCastOverflow(void *DataPtr, ValueHandle From, |
| ReportOptions Opts) { |
| SymbolizedStackHolder CallerLoc; |
| Location Loc; |
| const TypeDescriptor *FromType, *ToType; |
| ErrorType ET = ErrorType::FloatCastOverflow; |
| |
| if (looksLikeFloatCastOverflowDataV1(DataPtr)) { |
| auto Data = reinterpret_cast<FloatCastOverflowData *>(DataPtr); |
| CallerLoc.reset(getCallerLocation(Opts.pc)); |
| Loc = CallerLoc; |
| FromType = &Data->FromType; |
| ToType = &Data->ToType; |
| } else { |
| auto Data = reinterpret_cast<FloatCastOverflowDataV2 *>(DataPtr); |
| SourceLocation SLoc = Data->Loc.acquire(); |
| if (ignoreReport(SLoc, Opts, ET)) |
| return; |
| Loc = SLoc; |
| FromType = &Data->FromType; |
| ToType = &Data->ToType; |
| } |
| |
| ScopedReport R(Opts, Loc, ET); |
| |
| Diag(Loc, DL_Error, ET, |
| "%0 is outside the range of representable values of type %2") |
| << Value(*FromType, From) << *FromType << *ToType; |
| } |
| |
| void __ubsan::__ubsan_handle_float_cast_overflow(void *Data, ValueHandle From) { |
| GET_REPORT_OPTIONS(false); |
| handleFloatCastOverflow(Data, From, Opts); |
| } |
| void __ubsan::__ubsan_handle_float_cast_overflow_abort(void *Data, |
| ValueHandle From) { |
| GET_REPORT_OPTIONS(true); |
| handleFloatCastOverflow(Data, From, Opts); |
| Die(); |
| } |
| |
| static void handleLoadInvalidValue(InvalidValueData *Data, ValueHandle Val, |
| ReportOptions Opts) { |
| SourceLocation Loc = Data->Loc.acquire(); |
| // This check could be more precise if we used different handlers for |
| // -fsanitize=bool and -fsanitize=enum. |
| bool IsBool = (0 == internal_strcmp(Data->Type.getTypeName(), "'bool'")) || |
| (0 == internal_strncmp(Data->Type.getTypeName(), "'BOOL'", 6)); |
| ErrorType ET = |
| IsBool ? ErrorType::InvalidBoolLoad : ErrorType::InvalidEnumLoad; |
| |
| if (ignoreReport(Loc, Opts, ET)) |
| return; |
| |
| ScopedReport R(Opts, Loc, ET); |
| |
| Diag(Loc, DL_Error, ET, |
| "load of value %0, which is not a valid value for type %1") |
| << Value(Data->Type, Val) << Data->Type; |
| } |
| |
| void __ubsan::__ubsan_handle_load_invalid_value(InvalidValueData *Data, |
| ValueHandle Val) { |
| GET_REPORT_OPTIONS(false); |
| handleLoadInvalidValue(Data, Val, Opts); |
| } |
| void __ubsan::__ubsan_handle_load_invalid_value_abort(InvalidValueData *Data, |
| ValueHandle Val) { |
| GET_REPORT_OPTIONS(true); |
| handleLoadInvalidValue(Data, Val, Opts); |
| Die(); |
| } |
| |
| static void handleImplicitConversion(ImplicitConversionData *Data, |
| ReportOptions Opts, ValueHandle Src, |
| ValueHandle Dst) { |
| SourceLocation Loc = Data->Loc.acquire(); |
| ErrorType ET = ErrorType::GenericUB; |
| |
| const TypeDescriptor &SrcTy = Data->FromType; |
| const TypeDescriptor &DstTy = Data->ToType; |
| |
| bool SrcSigned = SrcTy.isSignedIntegerTy(); |
| bool DstSigned = DstTy.isSignedIntegerTy(); |
| |
| switch (Data->Kind) { |
| case ICCK_IntegerTruncation: { // Legacy, no longer used. |
| // Let's figure out what it should be as per the new types, and upgrade. |
| // If both types are unsigned, then it's an unsigned truncation. |
| // Else, it is a signed truncation. |
| if (!SrcSigned && !DstSigned) { |
| ET = ErrorType::ImplicitUnsignedIntegerTruncation; |
| } else { |
| ET = ErrorType::ImplicitSignedIntegerTruncation; |
| } |
| break; |
| } |
| case ICCK_UnsignedIntegerTruncation: |
| ET = ErrorType::ImplicitUnsignedIntegerTruncation; |
| break; |
| case ICCK_SignedIntegerTruncation: |
| ET = ErrorType::ImplicitSignedIntegerTruncation; |
| break; |
| case ICCK_IntegerSignChange: |
| ET = ErrorType::ImplicitIntegerSignChange; |
| break; |
| case ICCK_SignedIntegerTruncationOrSignChange: |
| ET = ErrorType::ImplicitSignedIntegerTruncationOrSignChange; |
| break; |
| } |
| |
| if (ignoreReport(Loc, Opts, ET)) |
| return; |
| |
| ScopedReport R(Opts, Loc, ET); |
| |
| // FIXME: is it possible to dump the values as hex with fixed width? |
| |
| Diag(Loc, DL_Error, ET, |
| "implicit conversion from type %0 of value %1 (%2-bit, %3signed) to " |
| "type %4 changed the value to %5 (%6-bit, %7signed)") |
| << SrcTy << Value(SrcTy, Src) << SrcTy.getIntegerBitWidth() |
| << (SrcSigned ? "" : "un") << DstTy << Value(DstTy, Dst) |
| << DstTy.getIntegerBitWidth() << (DstSigned ? "" : "un"); |
| } |
| |
| void __ubsan::__ubsan_handle_implicit_conversion(ImplicitConversionData *Data, |
| ValueHandle Src, |
| ValueHandle Dst) { |
| GET_REPORT_OPTIONS(false); |
| handleImplicitConversion(Data, Opts, Src, Dst); |
| } |
| void __ubsan::__ubsan_handle_implicit_conversion_abort( |
| ImplicitConversionData *Data, ValueHandle Src, ValueHandle Dst) { |
| GET_REPORT_OPTIONS(true); |
| handleImplicitConversion(Data, Opts, Src, Dst); |
| Die(); |
| } |
| |
| static void handleInvalidBuiltin(InvalidBuiltinData *Data, ReportOptions Opts) { |
| SourceLocation Loc = Data->Loc.acquire(); |
| ErrorType ET = ErrorType::InvalidBuiltin; |
| |
| if (ignoreReport(Loc, Opts, ET)) |
| return; |
| |
| ScopedReport R(Opts, Loc, ET); |
| |
| Diag(Loc, DL_Error, ET, |
| "passing zero to %0, which is not a valid argument") |
| << ((Data->Kind == BCK_CTZPassedZero) ? "ctz()" : "clz()"); |
| } |
| |
| void __ubsan::__ubsan_handle_invalid_builtin(InvalidBuiltinData *Data) { |
| GET_REPORT_OPTIONS(true); |
| handleInvalidBuiltin(Data, Opts); |
| } |
| void __ubsan::__ubsan_handle_invalid_builtin_abort(InvalidBuiltinData *Data) { |
| GET_REPORT_OPTIONS(true); |
| handleInvalidBuiltin(Data, Opts); |
| Die(); |
| } |
| |
| static void handleInvalidObjCCast(InvalidObjCCast *Data, ValueHandle Pointer, |
| ReportOptions Opts) { |
| SourceLocation Loc = Data->Loc.acquire(); |
| ErrorType ET = ErrorType::InvalidObjCCast; |
| |
| if (ignoreReport(Loc, Opts, ET)) |
| return; |
| |
| ScopedReport R(Opts, Loc, ET); |
| |
| const char *GivenClass = getObjCClassName(Pointer); |
| const char *GivenClassStr = GivenClass ? GivenClass : "<unknown type>"; |
| |
| Diag(Loc, DL_Error, ET, |
| "invalid ObjC cast, object is a '%0', but expected a %1") |
| << GivenClassStr << Data->ExpectedType; |
| } |
| |
| void __ubsan::__ubsan_handle_invalid_objc_cast(InvalidObjCCast *Data, |
| ValueHandle Pointer) { |
| GET_REPORT_OPTIONS(false); |
| handleInvalidObjCCast(Data, Pointer, Opts); |
| } |
| void __ubsan::__ubsan_handle_invalid_objc_cast_abort(InvalidObjCCast *Data, |
| ValueHandle Pointer) { |
| GET_REPORT_OPTIONS(true); |
| handleInvalidObjCCast(Data, Pointer, Opts); |
| Die(); |
| } |
| |
| static void handleNonNullReturn(NonNullReturnData *Data, SourceLocation *LocPtr, |
| ReportOptions Opts, bool IsAttr) { |
| if (!LocPtr) |
| UNREACHABLE("source location pointer is null!"); |
| |
| SourceLocation Loc = LocPtr->acquire(); |
| ErrorType ET = IsAttr ? ErrorType::InvalidNullReturn |
| : ErrorType::InvalidNullReturnWithNullability; |
| |
| if (ignoreReport(Loc, Opts, ET)) |
| return; |
| |
| ScopedReport R(Opts, Loc, ET); |
| |
| Diag(Loc, DL_Error, ET, |
| "null pointer returned from function declared to never return null"); |
| if (!Data->AttrLoc.isInvalid()) |
| Diag(Data->AttrLoc, DL_Note, ET, "%0 specified here") |
| << (IsAttr ? "returns_nonnull attribute" |
| : "_Nonnull return type annotation"); |
| } |
| |
| void __ubsan::__ubsan_handle_nonnull_return_v1(NonNullReturnData *Data, |
| SourceLocation *LocPtr) { |
| GET_REPORT_OPTIONS(false); |
| handleNonNullReturn(Data, LocPtr, Opts, true); |
| } |
| |
| void __ubsan::__ubsan_handle_nonnull_return_v1_abort(NonNullReturnData *Data, |
| SourceLocation *LocPtr) { |
| GET_REPORT_OPTIONS(true); |
| handleNonNullReturn(Data, LocPtr, Opts, true); |
| Die(); |
| } |
| |
| void __ubsan::__ubsan_handle_nullability_return_v1(NonNullReturnData *Data, |
| SourceLocation *LocPtr) { |
| GET_REPORT_OPTIONS(false); |
| handleNonNullReturn(Data, LocPtr, Opts, false); |
| } |
| |
| void __ubsan::__ubsan_handle_nullability_return_v1_abort( |
| NonNullReturnData *Data, SourceLocation *LocPtr) { |
| GET_REPORT_OPTIONS(true); |
| handleNonNullReturn(Data, LocPtr, Opts, false); |
| Die(); |
| } |
| |
| static void handleNonNullArg(NonNullArgData *Data, ReportOptions Opts, |
| bool IsAttr) { |
| SourceLocation Loc = Data->Loc.acquire(); |
| ErrorType ET = IsAttr ? ErrorType::InvalidNullArgument |
| : ErrorType::InvalidNullArgumentWithNullability; |
| |
| if (ignoreReport(Loc, Opts, ET)) |
| return; |
| |
| ScopedReport R(Opts, Loc, ET); |
| |
| Diag(Loc, DL_Error, ET, |
| "null pointer passed as argument %0, which is declared to " |
| "never be null") |
| << Data->ArgIndex; |
| if (!Data->AttrLoc.isInvalid()) |
| Diag(Data->AttrLoc, DL_Note, ET, "%0 specified here") |
| << (IsAttr ? "nonnull attribute" : "_Nonnull type annotation"); |
| } |
| |
| void __ubsan::__ubsan_handle_nonnull_arg(NonNullArgData *Data) { |
| GET_REPORT_OPTIONS(false); |
| handleNonNullArg(Data, Opts, true); |
| } |
| |
| void __ubsan::__ubsan_handle_nonnull_arg_abort(NonNullArgData *Data) { |
| GET_REPORT_OPTIONS(true); |
| handleNonNullArg(Data, Opts, true); |
| Die(); |
| } |
| |
| void __ubsan::__ubsan_handle_nullability_arg(NonNullArgData *Data) { |
| GET_REPORT_OPTIONS(false); |
| handleNonNullArg(Data, Opts, false); |
| } |
| |
| void __ubsan::__ubsan_handle_nullability_arg_abort(NonNullArgData *Data) { |
| GET_REPORT_OPTIONS(true); |
| handleNonNullArg(Data, Opts, false); |
| Die(); |
| } |
| |
| static void handlePointerOverflowImpl(PointerOverflowData *Data, |
| ValueHandle Base, |
| ValueHandle Result, |
| ReportOptions Opts) { |
| SourceLocation Loc = Data->Loc.acquire(); |
| ErrorType ET; |
| |
| if (Base == 0 && Result == 0) |
| ET = ErrorType::NullptrWithOffset; |
| else if (Base == 0 && Result != 0) |
| ET = ErrorType::NullptrWithNonZeroOffset; |
| else if (Base != 0 && Result == 0) |
| ET = ErrorType::NullptrAfterNonZeroOffset; |
| else |
| ET = ErrorType::PointerOverflow; |
| |
| if (ignoreReport(Loc, Opts, ET)) |
| return; |
| |
| ScopedReport R(Opts, Loc, ET); |
| |
| if (ET == ErrorType::NullptrWithOffset) { |
| Diag(Loc, DL_Error, ET, "applying zero offset to null pointer"); |
| } else if (ET == ErrorType::NullptrWithNonZeroOffset) { |
| Diag(Loc, DL_Error, ET, "applying non-zero offset %0 to null pointer") |
| << Result; |
| } else if (ET == ErrorType::NullptrAfterNonZeroOffset) { |
| Diag( |
| Loc, DL_Error, ET, |
| "applying non-zero offset to non-null pointer %0 produced null pointer") |
| << (void *)Base; |
| } else if ((sptr(Base) >= 0) == (sptr(Result) >= 0)) { |
| if (Base > Result) |
| Diag(Loc, DL_Error, ET, |
| "addition of unsigned offset to %0 overflowed to %1") |
| << (void *)Base << (void *)Result; |
| else |
| Diag(Loc, DL_Error, ET, |
| "subtraction of unsigned offset from %0 overflowed to %1") |
| << (void *)Base << (void *)Result; |
| } else { |
| Diag(Loc, DL_Error, ET, |
| "pointer index expression with base %0 overflowed to %1") |
| << (void *)Base << (void *)Result; |
| } |
| } |
| |
| void __ubsan::__ubsan_handle_pointer_overflow(PointerOverflowData *Data, |
| ValueHandle Base, |
| ValueHandle Result) { |
| GET_REPORT_OPTIONS(false); |
| handlePointerOverflowImpl(Data, Base, Result, Opts); |
| } |
| |
| void __ubsan::__ubsan_handle_pointer_overflow_abort(PointerOverflowData *Data, |
| ValueHandle Base, |
| ValueHandle Result) { |
| GET_REPORT_OPTIONS(true); |
| handlePointerOverflowImpl(Data, Base, Result, Opts); |
| Die(); |
| } |
| |
| static void handleCFIBadIcall(CFICheckFailData *Data, ValueHandle Function, |
| ReportOptions Opts) { |
| if (Data->CheckKind != CFITCK_ICall && Data->CheckKind != CFITCK_NVMFCall) |
| Die(); |
| |
| SourceLocation Loc = Data->Loc.acquire(); |
| ErrorType ET = ErrorType::CFIBadType; |
| |
| if (ignoreReport(Loc, Opts, ET)) |
| return; |
| |
| ScopedReport R(Opts, Loc, ET); |
| |
| const char *CheckKindStr = Data->CheckKind == CFITCK_NVMFCall |
| ? "non-virtual pointer to member function call" |
| : "indirect function call"; |
| Diag(Loc, DL_Error, ET, |
| "control flow integrity check for type %0 failed during %1") |
| << Data->Type << CheckKindStr; |
| |
| SymbolizedStackHolder FLoc(getSymbolizedLocation(Function)); |
| const char *FName = FLoc.get()->info.function; |
| if (!FName) |
| FName = "(unknown)"; |
| Diag(FLoc, DL_Note, ET, "%0 defined here") << FName; |
| |
| // If the failure involved different DSOs for the check location and icall |
| // target, report the DSO names. |
| const char *DstModule = FLoc.get()->info.module; |
| if (!DstModule) |
| DstModule = "(unknown)"; |
| |
| const char *SrcModule = Symbolizer::GetOrInit()->GetModuleNameForPc(Opts.pc); |
| if (!SrcModule) |
| SrcModule = "(unknown)"; |
| |
| if (internal_strcmp(SrcModule, DstModule)) |
| Diag(Loc, DL_Note, ET, |
| "check failed in %0, destination function located in %1") |
| << SrcModule << DstModule; |
| } |
| |
| namespace __ubsan { |
| |
| #ifdef UBSAN_CAN_USE_CXXABI |
| |
| #ifdef _WIN32 |
| |
| extern "C" void __ubsan_handle_cfi_bad_type_default(CFICheckFailData *Data, |
| ValueHandle Vtable, |
| bool ValidVtable, |
| ReportOptions Opts) { |
| Die(); |
| } |
| |
| WIN_WEAK_ALIAS(__ubsan_handle_cfi_bad_type, __ubsan_handle_cfi_bad_type_default) |
| #else |
| SANITIZER_WEAK_ATTRIBUTE |
| #endif |
| void __ubsan_handle_cfi_bad_type(CFICheckFailData *Data, ValueHandle Vtable, |
| bool ValidVtable, ReportOptions Opts); |
| |
| #else |
| void __ubsan_handle_cfi_bad_type(CFICheckFailData *Data, ValueHandle Vtable, |
| bool ValidVtable, ReportOptions Opts) { |
| Die(); |
| } |
| #endif |
| |
| } // namespace __ubsan |
| |
| void __ubsan::__ubsan_handle_cfi_check_fail(CFICheckFailData *Data, |
| ValueHandle Value, |
| uptr ValidVtable) { |
| GET_REPORT_OPTIONS(false); |
| if (Data->CheckKind == CFITCK_ICall || Data->CheckKind == CFITCK_NVMFCall) |
| handleCFIBadIcall(Data, Value, Opts); |
| else |
| __ubsan_handle_cfi_bad_type(Data, Value, ValidVtable, Opts); |
| } |
| |
| void __ubsan::__ubsan_handle_cfi_check_fail_abort(CFICheckFailData *Data, |
| ValueHandle Value, |
| uptr ValidVtable) { |
| GET_REPORT_OPTIONS(true); |
| if (Data->CheckKind == CFITCK_ICall || Data->CheckKind == CFITCK_NVMFCall) |
| handleCFIBadIcall(Data, Value, Opts); |
| else |
| __ubsan_handle_cfi_bad_type(Data, Value, ValidVtable, Opts); |
| Die(); |
| } |
| |
| #endif // CAN_SANITIZE_UB |
