diff --git a/clang/docs/ControlFlowIntegrity.rst b/clang/docs/ControlFlowIntegrity.rst --- a/clang/docs/ControlFlowIntegrity.rst +++ b/clang/docs/ControlFlowIntegrity.rst @@ -236,6 +236,23 @@ ``-fsanitize-cfi-icall-generalize-pointers`` is not compatible with ``-fsanitize-cfi-cross-dso``. +.. _cfi-icall-normalize-integers: + +``-fsanitize-cfi-icall-normalize-integers`` +-------------------------------------------- + +This option enables normalizing integer types as vendor extended types for +cross-language LLVM CFI/KCFI support with other languages that can't represent +and encode C/C++ integer types. + +Specifically, integer types are encoded as their defined representations (e.g., +8-bit signed integer, 16-bit signed integer, 32-bit signed integer, ...) for +compatibility with languages that define explicitly-sized integer types (e.g., +i8, i16, i32, ..., in Rust). + +``-fsanitize-cfi-icall-normalize-integers`` is compatible with +``-fsanitize-cfi-icall-generalize-pointers``. + .. _cfi-canonical-jump-tables: ``-fsanitize-cfi-canonical-jump-tables`` diff --git a/clang/docs/UsersManual.rst b/clang/docs/UsersManual.rst --- a/clang/docs/UsersManual.rst +++ b/clang/docs/UsersManual.rst @@ -1951,6 +1951,12 @@ checked by Control Flow Integrity indirect call checking. See :doc:`ControlFlowIntegrity` for more details. +.. option:: -fsanitize-cfi-icall-normalize-integers + + Normalize integers in return and argument types in function type signatures + checked by Control Flow Integrity indirect call checking. See + :doc:`ControlFlowIntegrity` for more details. + .. option:: -fstrict-vtable-pointers Enable optimizations based on the strict rules for overwriting polymorphic diff --git a/clang/include/clang/AST/Mangle.h b/clang/include/clang/AST/Mangle.h --- a/clang/include/clang/AST/Mangle.h +++ b/clang/include/clang/AST/Mangle.h @@ -139,7 +139,8 @@ unsigned ManglingNumber, raw_ostream &) = 0; virtual void mangleCXXRTTI(QualType T, raw_ostream &) = 0; - virtual void mangleCXXRTTIName(QualType T, raw_ostream &) = 0; + virtual void mangleCXXRTTIName(QualType T, raw_ostream &, + bool NormalizeIntegers = false) = 0; virtual void mangleStringLiteral(const StringLiteral *SL, raw_ostream &) = 0; virtual void mangleMSGuidDecl(const MSGuidDecl *GD, raw_ostream&); @@ -176,7 +177,8 @@ /// or type uniquing. /// TODO: Extend this to internal types by generating names that are unique /// across translation units so it can be used with LTO. - virtual void mangleTypeName(QualType T, raw_ostream &) = 0; + virtual void mangleTypeName(QualType T, raw_ostream &, + bool NormalizeIntegers = false) = 0; /// @} }; diff --git a/clang/include/clang/Basic/CodeGenOptions.def b/clang/include/clang/Basic/CodeGenOptions.def --- a/clang/include/clang/Basic/CodeGenOptions.def +++ b/clang/include/clang/Basic/CodeGenOptions.def @@ -258,6 +258,8 @@ ///< diagnostics. CODEGENOPT(SanitizeCfiICallGeneralizePointers, 1, 0) ///< Generalize pointer types in ///< CFI icall function signatures +CODEGENOPT(SanitizeCfiICallNormalizeIntegers, 1, 0) ///< Normalize integer types in + ///< CFI icall function signatures CODEGENOPT(SanitizeCfiCanonicalJumpTables, 1, 0) ///< Make jump table symbols canonical ///< instead of creating a local jump table. CODEGENOPT(SanitizeCoverageType, 2, 0) ///< Type of sanitizer coverage diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td --- a/clang/include/clang/Driver/Options.td +++ b/clang/include/clang/Driver/Options.td @@ -1845,6 +1845,10 @@ Group, HelpText<"Generalize pointers in CFI indirect call type signature checks">, MarshallingInfoFlag>; +def fsanitize_cfi_icall_normalize_integers : Flag<["-"], "fsanitize-cfi-icall-normalize-integers">, + Group, + HelpText<"Normalize integers in CFI indirect call type signature checks">, + MarshallingInfoFlag>; defm sanitize_cfi_canonical_jump_tables : BoolOption<"f", "sanitize-cfi-canonical-jump-tables", CodeGenOpts<"SanitizeCfiCanonicalJumpTables">, DefaultFalse, PosFlag, NegFlag, diff --git a/clang/include/clang/Driver/SanitizerArgs.h b/clang/include/clang/Driver/SanitizerArgs.h --- a/clang/include/clang/Driver/SanitizerArgs.h +++ b/clang/include/clang/Driver/SanitizerArgs.h @@ -37,6 +37,7 @@ bool MsanParamRetval = true; bool CfiCrossDso = false; bool CfiICallGeneralizePointers = false; + bool CfiICallNormalizeIntegers = false; bool CfiCanonicalJumpTables = false; int AsanFieldPadding = 0; bool SharedRuntime = false; diff --git a/clang/lib/AST/ItaniumMangle.cpp b/clang/lib/AST/ItaniumMangle.cpp --- a/clang/lib/AST/ItaniumMangle.cpp +++ b/clang/lib/AST/ItaniumMangle.cpp @@ -108,8 +108,10 @@ void mangleCXXCtorVTable(const CXXRecordDecl *RD, int64_t Offset, const CXXRecordDecl *Type, raw_ostream &) override; void mangleCXXRTTI(QualType T, raw_ostream &) override; - void mangleCXXRTTIName(QualType T, raw_ostream &) override; - void mangleTypeName(QualType T, raw_ostream &) override; + void mangleCXXRTTIName(QualType T, raw_ostream &, + bool NormalizeIntegers) override; + void mangleTypeName(QualType T, raw_ostream &, + bool NormalizeIntegers) override; void mangleCXXCtorComdat(const CXXConstructorDecl *D, raw_ostream &) override; void mangleCXXDtorComdat(const CXXDestructorDecl *D, raw_ostream &) override; @@ -214,6 +216,10 @@ class CXXNameMangler { ItaniumMangleContextImpl &Context; raw_ostream &Out; + /// Normalize integer types for cross-language CFI support with other + /// languages that can't represent and encode C/C++ integer types. + bool NormalizeIntegers = false; + bool NullOut = false; /// In the "DisableDerivedAbiTags" mode derived ABI tags are not calculated. /// This mode is used when mangler creates another mangler recursively to @@ -412,6 +418,10 @@ : Context(C), Out(Out_), Structor(getStructor(D)), StructorType(Type), AbiTagsRoot(AbiTags) {} + CXXNameMangler(ItaniumMangleContextImpl &C, raw_ostream &Out_, + bool NormalizeIntegers_) + : Context(C), Out(Out_), NormalizeIntegers(NormalizeIntegers_), + NullOut(false), AbiTagsRoot(AbiTags) {} CXXNameMangler(CXXNameMangler &Outer, raw_ostream &Out_) : Context(Outer.Context), Out(Out_), Structor(Outer.Structor), StructorType(Outer.StructorType), SeqID(Outer.SeqID), @@ -2936,6 +2946,52 @@ // ::= Dn # std::nullptr_t (i.e., decltype(nullptr)) // ::= u # vendor extended type std::string type_name; + // Normalize integer types for cross-language CFI support with other languages + // that can't represent and encode C/C++ integer types. + if (NormalizeIntegers && T->isInteger()) { + if (T->isSignedInteger()) { + switch (getASTContext().getTypeSize(T)) { + case 8: + Out << "u2i8"; + break; + case 16: + Out << "u3i16"; + break; + case 32: + Out << "u3i32"; + break; + case 64: + Out << "u3i64"; + break; + case 128: + Out << "u4i128"; + break; + default: + llvm_unreachable("Unknown integer size for normalization"); + } + } else { + switch (getASTContext().getTypeSize(T)) { + case 8: + Out << "u2u8"; + break; + case 16: + Out << "u3u16"; + break; + case 32: + Out << "u3u32"; + break; + case 64: + Out << "u3u64"; + break; + case 128: + Out << "u4u128"; + break; + default: + llvm_unreachable("Unknown integer size for normalization"); + } + } + return; + } switch (T->getKind()) { case BuiltinType::Void: Out << 'v'; @@ -6517,16 +6573,17 @@ Mangler.mangleType(Ty); } -void ItaniumMangleContextImpl::mangleCXXRTTIName(QualType Ty, - raw_ostream &Out) { +void ItaniumMangleContextImpl::mangleCXXRTTIName( + QualType Ty, raw_ostream &Out, bool NormalizeIntegers = false) { // ::= TS # typeinfo name (null terminated byte string) - CXXNameMangler Mangler(*this, Out); + CXXNameMangler Mangler(*this, Out, NormalizeIntegers); Mangler.getStream() << "_ZTS"; Mangler.mangleType(Ty); } -void ItaniumMangleContextImpl::mangleTypeName(QualType Ty, raw_ostream &Out) { - mangleCXXRTTIName(Ty, Out); +void ItaniumMangleContextImpl::mangleTypeName(QualType Ty, raw_ostream &Out, + bool NormalizeIntegers = false) { + mangleCXXRTTIName(Ty, Out, NormalizeIntegers); } void ItaniumMangleContextImpl::mangleStringLiteral(const StringLiteral *, raw_ostream &) { diff --git a/clang/lib/AST/MicrosoftMangle.cpp b/clang/lib/AST/MicrosoftMangle.cpp --- a/clang/lib/AST/MicrosoftMangle.cpp +++ b/clang/lib/AST/MicrosoftMangle.cpp @@ -179,7 +179,8 @@ int32_t VBPtrOffset, uint32_t VBIndex, raw_ostream &Out) override; void mangleCXXRTTI(QualType T, raw_ostream &Out) override; - void mangleCXXRTTIName(QualType T, raw_ostream &Out) override; + void mangleCXXRTTIName(QualType T, raw_ostream &Out, + bool NormalizeIntegers) override; void mangleCXXRTTIBaseClassDescriptor(const CXXRecordDecl *Derived, uint32_t NVOffset, int32_t VBPtrOffset, uint32_t VBTableOffset, uint32_t Flags, @@ -192,7 +193,8 @@ mangleCXXRTTICompleteObjectLocator(const CXXRecordDecl *Derived, ArrayRef BasePath, raw_ostream &Out) override; - void mangleTypeName(QualType T, raw_ostream &) override; + void mangleTypeName(QualType T, raw_ostream &, + bool NormalizeIntegers) override; void mangleReferenceTemporary(const VarDecl *, unsigned ManglingNumber, raw_ostream &) override; void mangleStaticGuardVariable(const VarDecl *D, raw_ostream &Out) override; @@ -3585,8 +3587,8 @@ Mangler.getStream() << "@8"; } -void MicrosoftMangleContextImpl::mangleCXXRTTIName(QualType T, - raw_ostream &Out) { +void MicrosoftMangleContextImpl::mangleCXXRTTIName( + QualType T, raw_ostream &Out, bool NormalizeIntegers = false) { MicrosoftCXXNameMangler Mangler(*this, Out); Mangler.getStream() << '.'; Mangler.mangleType(T, SourceRange(), MicrosoftCXXNameMangler::QMM_Result); @@ -3753,7 +3755,8 @@ Mangler.mangleName(EnclosingDecl); } -void MicrosoftMangleContextImpl::mangleTypeName(QualType T, raw_ostream &Out) { +void MicrosoftMangleContextImpl::mangleTypeName( + QualType T, raw_ostream &Out, bool NormalizeIntegers = false) { // This is just a made up unique string for the purposes of tbaa. undname // does *not* know how to demangle it. MicrosoftCXXNameMangler Mangler(*this, Out); diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp --- a/clang/lib/CodeGen/CodeGenModule.cpp +++ b/clang/lib/CodeGen/CodeGenModule.cpp @@ -6873,7 +6873,8 @@ if (isExternallyVisible(T->getLinkage())) { std::string OutName; llvm::raw_string_ostream Out(OutName); - getCXXABI().getMangleContext().mangleTypeName(T, Out); + getCXXABI().getMangleContext().mangleTypeName( + T, Out, !!getCodeGenOpts().SanitizeCfiICallNormalizeIntegers); Out << Suffix; InternalId = llvm::MDString::get(getLLVMContext(), Out.str()); diff --git a/clang/lib/Driver/SanitizerArgs.cpp b/clang/lib/Driver/SanitizerArgs.cpp --- a/clang/lib/Driver/SanitizerArgs.cpp +++ b/clang/lib/Driver/SanitizerArgs.cpp @@ -715,6 +715,9 @@ CfiICallGeneralizePointers = Args.hasArg(options::OPT_fsanitize_cfi_icall_generalize_pointers); + CfiICallNormalizeIntegers = + Args.hasArg(options::OPT_fsanitize_cfi_icall_normalize_integers); + if (CfiCrossDso && CfiICallGeneralizePointers && DiagnoseErrors) D.Diag(diag::err_drv_argument_not_allowed_with) << "-fsanitize-cfi-cross-dso" @@ -1218,6 +1221,9 @@ if (CfiICallGeneralizePointers) CmdArgs.push_back("-fsanitize-cfi-icall-generalize-pointers"); + if (CfiICallNormalizeIntegers) + CmdArgs.push_back("-fsanitize-cfi-icall-normalize-integers"); + if (CfiCanonicalJumpTables) CmdArgs.push_back("-fsanitize-cfi-canonical-jump-tables"); diff --git a/clang/test/CodeGen/cfi-icall-normalize.c b/clang/test/CodeGen/cfi-icall-normalize.c new file mode 100644 --- /dev/null +++ b/clang/test/CodeGen/cfi-icall-normalize.c @@ -0,0 +1,17 @@ +// RUN: %clang_cc1 -triple x86_64-unknown-linux -fsanitize=cfi-icall -fsanitize-trap=cfi-icall -fsanitize-cfi-icall-normalize-integers -emit-llvm -o - %s | FileCheck %s + +// Test that integer types are normalized for cross-language CFI support with +// other languages that can't represent and encode C/C++ integer types. + +// CHECK: define{{.*}}foo{{.*}}!type ![[TYPE1:[0-9]+]]{{.*}}!type ![[TYPE2:[0-9]+]] +int foo(char arg1, short arg2) { + return 0; +} + +void bar(int (*fn)(char arg1, short arg2)) { + // CHECK: call i1 @llvm.type.test(ptr {{.*}}, metadata !"_ZTSFu3i32u2i8u3i16E") + fn(0, 0); +} + +// CHECK: ![[TYPE1]] = !{i64 0, !"_ZTSFu3i32u2i8u3i16E"} +// CHECK: ![[TYPE2]] = !{i64 0, !"_ZTSFu3i32u2i8u3i16E.generalized"}