Allow specifying sanitizers in blacklists

[vlad.tsyrklevich]

Summary

This is the follow-up patch to D37924.

This change refactors clang to use the the newly added section headers
in SpecialCaseList to specify which sanitizers blacklists entries
should apply to, like so:

[cfi-vcall]
fun:*bad_vcall*
[cfi-derived-cast|cfi-unrelated-cast]
fun:*bad_cast*

The SanitizerSpecialCaseList class has been added to allow querying by
SanitizerMask, and SanitizerBlacklist and its downstream users have been
updated to provide that information. Old blacklists not using sections
will continue to function identically since the blacklist entries will
be placed into a '[*]' section by default matching against all
sanitizers.

[vlad.tsyrklevich]

Not included in this change:

• Updating the sanitizer documentation to use section headers. It's worth doing for the CFI documentation to let people know they can break down blacklist entries by CFI mode, but is it worth pushing users to specify '[address]', '[memory]', etc. sections for the other sanitizers as well?
• Merging the various sanitizer blacklists into a single blacklist. I'd like to pursue this in a later change where I also plan to break down the cfi blacklist by the specific CFI mode they should be blacklisted by.

[vlad.tsyrklevich]

Run clang-format.

[eugenis]

include/clang/Basic/SanitizerSpecialCaseList.h

34

Please add a comment on the meaning of Mask. I assume it's any-of?

lib/CodeGen/CodeGenModule.cpp

1571

would this blacklist [address] when compiling for kernel-address, and vice versa?

test/CodeGen/sanitizer-special-case-list.c

5

it is common to add such files as actual files under Inputs/

[vlad.tsyrklevich]

include/clang/Basic/SanitizerSpecialCaseList.h

34

Correct, I'll add a comment regarding this.

lib/CodeGen/CGDeclCXX.cpp

321

This use of ASanMask could also confound address & kernel-address as @eugenis pointed out.

lib/CodeGen/CodeGenModule.cpp

1571

Yes, it would. We should pass the actual sanitizer option mask ANDed with the ASanMask here. Thanks!

[vlad.tsyrklevich]

Address @eugenis' comments

[vlad.tsyrklevich]

Update documentation to mention sections in the blacklist documentation and in the CFI documentation (where it's most useful)

[vlad.tsyrklevich]

Update for SectionsMap refactor in LLVM

[eugenis]

docs/SanitizerSpecialCaseList.rst

57

Section names are regular expressions

also, not really a regular expression, more like a wildcard; I don't know what's the right term for this

lib/CodeGen/CGDeclCXX.cpp

321

It would be more readable to split it in two if-s, IMHO: one for asan, one for kernel-asan.

[vlad.tsyrklevich]

• Refactor to make compile() not virtual again
• Refactor a confusing use of ASanMask into individual uses of SanitizerKind::{Address,KernelAddress}
• 'Sections' -> 'Section names'

[vlad.tsyrklevich]

docs/SanitizerSpecialCaseList.rst

57

They are not just wildcards in the sense that cfi-vcall|cfi-icall is more than just wildcard matching. I could add a line that explains how * behaves here as well? (similarly to what we have in the entries paragraph)

lib/CodeGen/CGDeclCXX.cpp

321

Agreed.

[eugenis]

include/clang/Basic/SanitizerSpecialCaseList.h

39

"compile" in this method name is confusing. It's used in the base class to refer to regexp compilation. Let's call this one createSanitizerSections.

lib/AST/Decl.cpp

3932

"Asan" is a more common spelling in clang & compiler-rt identifiers (even though official abbreviation is ASan).

3953

Looks like this is another case of missing "& LangOpts.Sanitize.Mask" ?

lib/Basic/XRayLists.cpp

29

It feels redundant to have AlwaysInstrument and NeverInstrument lists, and then the same distinction in section names. Maybe sections could be named "xray" in both cases? Or, better, the lists could be merged into a single list with always and never sections? There is also an issue of backward compatibility. Anyway, that's for xray devs to decide. @dberris

lib/CodeGen/CodeGenModule.cpp

1564

AsanMask

[vlad.tsyrklevich]

• sanitizerCompile -> createSanitizerSections
• ASanMask -> AsanMask and fix another bug relating to ANDing with LangOpts.Sanitize.Mask

[vlad.tsyrklevich]

lib/AST/Decl.cpp

3953

Indeed.

lib/Basic/XRayLists.cpp

29

I chose this approach for backwards compatibility, but I'd defer to what @dberris thinks is best.

[dberris]

lib/Basic/XRayLists.cpp

29

Sorry for being late here.

I'm fine with keeping this as-is, then merging the lists into a single one. At the time this was designed/implemented, I hadn't thought about whether we could have used a single list. At the time it made sense to separate the always/never lists and applied in a set order (always wins over never).

If this is all-new functionality anyway, I'd think using "xray" as the section header and then using per-entry "always" and "never" identifiers/sections make sense.

If you leave a TODO here (and/or file a bug on XRay) I can do the migration to a single list later. I'm fine with how this is set as-is.

docs/ControlFlowIntegrity.rst

 
 .. _cfi-blacklist:
 
 Blacklist
 =========
 
 A :doc:`SanitizerSpecialCaseList` can be used to relax CFI checks for certain
 source files, functions and types using the ``src``, ``fun`` and ``type``
-entity types.
+entity types. Specific CFI modes can be be specified using ``[section]``
+headers.
 
 .. code-block:: bash
 
-    # Suppress checking for code in a file.
+    # Suppress all CFI checking for code in a file.
     src:bad_file.cpp
     src:bad_header.h
     # Ignore all functions with names containing MyFooBar.
     fun:*MyFooBar*
     # Ignore all types in the standard library.
     type:std::*
+    # Disable only unrelated cast checks for this function
+    [cfi-unrelated-cast]
+    fun:*UnrelatedCast*
+    # Disable CFI call checks for this function without affecting cast checks
+    [cfi-vcall|cfi-nvcall|cfi-icall]
+    fun:*BadCall*
+
 
 .. _cfi-cross-dso:
 
 Shared library support
 ======================
 
 Use **-f[no-]sanitize-cfi-cross-dso** to enable the cross-DSO control
 flow integrity mode, which allows all CFI schemes listed above to

docs/SanitizerSpecialCaseList.rst

.. code-block:: bash
   $ clang -fsanitize=address foo.c ; ./a.out
   # AddressSanitizer prints an error report.
   $ clang -fsanitize=address -fsanitize-blacklist=blacklist.txt foo.c ; ./a.out
   # No error report here.
 
 Format
 ======
 
-Each line contains an entity type, followed by a colon and a regular
-expression, specifying the names of the entities, optionally followed by
-an equals sign and a tool-specific category. Empty lines and lines starting
-with "#" are ignored. The meanining of ``*`` in regular expression for entity
-names is different - it is treated as in shell wildcarding. Two generic
-entity types are ``src`` and ``fun``, which allow user to add, respectively,
-source files and functions to special case list. Some sanitizer tools may
-introduce custom entity types - refer to tool-specific docs.
+Blacklists consist of entries, optionally grouped into sections. Empty lines and
+lines starting with "#" are ignored.
+
+Section names are regular expressions written in square brackets that denote
+which sanitizer the following entries apply to. For example, ``[address]``
+specifies AddressSanitizer while ``[cfi-vcall|cfi-icall]`` specifies Control
+Flow Integrity virtual and indirect call checking. Entries without a section
+will be placed under the ``[*]`` section applying to all enabled sanitizers.
+
+Entries contain an entity type, followed by a colon and a regular expression,
+specifying the names of the entities, optionally followed by an equals sign and
+a tool-specific category, e.g. ``fun:*ExampleFunc=example_category``.  The
+meaning of ``*`` in regular expression for entity names is different - it is
+treated as in shell wildcarding. Two generic entity types are ``src`` and
+``fun``, which allow users to specify source files and functions, respectively.
+Some sanitizer tools may introduce custom entity types and categories - refer to
+tool-specific docs.
 
 .. code-block:: bash
 
     # Lines starting with # are ignored.
     # Turn off checks for the source file (use absolute path or path relative
     # to the current working directory):
     src:/path/to/source/file.c
     # Turn off checks for a particular functions (use mangled names):
     fun:MyFooBar
     fun:_Z8MyFooBarv
     # Extended regular expressions are supported:
     fun:bad_(foo|bar)
     src:bad_source[1-9].c
     # Shell like usage of * is supported (* is treated as .*):
     src:bad/sources/*
     fun:*BadFunction*
     # Specific sanitizer tools may introduce categories.
     src:/special/path/*=special_sources
+    # Sections can be used to limit blacklist entries to specific sanitizers
+    [address]
+    fun:*BadASanFunc*
+    # Section names are regular expressions
+    [cfi-vcall|cfi-icall]
+    fun:*BadCfiCall
+    # Entries without sections are placed into [*] and apply to all sanitizers

include/clang/Basic/SanitizerBlacklist.h

 // User-provided blacklist used to disable/alter instrumentation done in
 // sanitizers.
 //
 //===----------------------------------------------------------------------===//
 #ifndef LLVM_CLANG_BASIC_SANITIZERBLACKLIST_H
 #define LLVM_CLANG_BASIC_SANITIZERBLACKLIST_H
 
 #include "clang/Basic/LLVM.h"
+#include "clang/Basic/SanitizerSpecialCaseList.h"
+#include "clang/Basic/Sanitizers.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Basic/SourceManager.h"
 #include "llvm/ADT/StringRef.h"
-#include "llvm/Support/SpecialCaseList.h"
 #include <memory>
 
 namespace clang {
 
 class SanitizerBlacklist {
-  std::unique_ptr<llvm::SpecialCaseList> SCL;
+  std::unique_ptr<SanitizerSpecialCaseList> SSCL;
   SourceManager &SM;
 
 public:
   SanitizerBlacklist(const std::vector<std::string> &BlacklistPaths,
                      SourceManager &SM);
-  bool isBlacklistedGlobal(StringRef GlobalName,
+  bool isBlacklistedGlobal(SanitizerMask Mask, StringRef GlobalName,
                            StringRef Category = StringRef()) const;
-  bool isBlacklistedType(StringRef MangledTypeName,
+  bool isBlacklistedType(SanitizerMask Mask, StringRef MangledTypeName,
                          StringRef Category = StringRef()) const;
-  bool isBlacklistedFunction(StringRef FunctionName) const;
-  bool isBlacklistedFile(StringRef FileName,
+  bool isBlacklistedFunction(SanitizerMask Mask, StringRef FunctionName) const;
+  bool isBlacklistedFile(SanitizerMask Mask, StringRef FileName,
                          StringRef Category = StringRef()) const;
-  bool isBlacklistedLocation(SourceLocation Loc,
+  bool isBlacklistedLocation(SanitizerMask Mask, SourceLocation Loc,
                              StringRef Category = StringRef()) const;
 };
 
 }  // end namespace clang
 
 #endif

include/clang/Basic/SanitizerSpecialCaseList.h

+//===--- SanitizerSpecialCaseList.h - SCL for sanitizers --------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// An extension of SpecialCaseList to allowing querying sections by
+// SanitizerMask.
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_CLANG_BASIC_SANITIZERSPECIALCASELIST_H
+#define LLVM_CLANG_BASIC_SANITIZERSPECIALCASELIST_H
+
+#include "clang/Basic/LLVM.h"
+#include "clang/Basic/Sanitizers.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/SpecialCaseList.h"
+#include <memory>
+
+namespace clang {
+
+class SanitizerSpecialCaseList : public llvm::SpecialCaseList {
+public:
+  static std::unique_ptr<SanitizerSpecialCaseList>
+  create(const std::vector<std::string> &Paths, std::string &Error);
+
+  static std::unique_ptr<SanitizerSpecialCaseList>
+  createOrDie(const std::vector<std::string> &Paths);
+
+  // Query blacklisted entries if any bit in Mask matches the entry's section.
+  bool inSection(SanitizerMask Mask, StringRef Prefix, StringRef Query,
+                 StringRef Category = StringRef()) const;
+
+protected:
+  // Initialize SanitizerSections.
+  void sanitizerCompile();
+
+  struct SanitizerSection {
+    SanitizerSection(SanitizerMask SM, SectionEntries &E)
+        : Mask(SM), Entries(E){};
+
+    SanitizerMask Mask;
+    SectionEntries &Entries;
+  };
+
+  std::vector<SanitizerSection> SanitizerSections;
+};
+
+} // end namespace clang
+
+#endif

lib/AST/Decl.cpp

if (Decls.empty())
     return;
 
   std::tie(FirstDecl, LastDecl) = BuildDeclChain(Decls,
                                                  /*FieldsAlreadyLoaded=*/false);
 }
 
 bool RecordDecl::mayInsertExtraPadding(bool EmitRemark) const {
   ASTContext &Context = getASTContext();
-  if (!Context.getLangOpts().Sanitize.hasOneOf(
-          SanitizerKind::Address | SanitizerKind::KernelAddress) ||
+  const SanitizerMask ASanMask =
+      SanitizerKind::Address | SanitizerKind::KernelAddress;
+  if (!Context.getLangOpts().Sanitize.hasOneOf(ASanMask) ||
       !Context.getLangOpts().SanitizeAddressFieldPadding)
     return false;
   const auto &Blacklist = Context.getSanitizerBlacklist();
   const auto *CXXRD = dyn_cast<CXXRecordDecl>(this);
   // We may be able to relax some of these requirements.
   int ReasonToReject = -1;
   if (!CXXRD || CXXRD->isExternCContext())
     ReasonToReject = 0;  // is not C++.
   else if (CXXRD->hasAttr<PackedAttr>())
     ReasonToReject = 1;  // is packed.
   else if (CXXRD->isUnion())
     ReasonToReject = 2;  // is a union.
   else if (CXXRD->isTriviallyCopyable())
     ReasonToReject = 3;  // is trivially copyable.
   else if (CXXRD->hasTrivialDestructor())
     ReasonToReject = 4;  // has trivial destructor.
   else if (CXXRD->isStandardLayout())
     ReasonToReject = 5;  // is standard layout.
-  else if (Blacklist.isBlacklistedLocation(getLocation(), "field-padding"))
+  else if (Blacklist.isBlacklistedLocation(ASanMask, getLocation(),
+                                           "field-padding"))
     ReasonToReject = 6;  // is in a blacklisted file.
-  else if (Blacklist.isBlacklistedType(getQualifiedNameAsString(),
+  else if (Blacklist.isBlacklistedType(ASanMask, getQualifiedNameAsString(),
                                        "field-padding"))
     ReasonToReject = 7;  // is blacklisted.
 
   if (EmitRemark) {
     if (ReasonToReject >= 0)
       Context.getDiagnostics().Report(
           getLocation(),
           diag::remark_sanitize_address_insert_extra_padding_rejected)

lib/Basic/CMakeLists.txt

add_clang_library(clangBasic
   IdentifierTable.cpp
   LangOptions.cpp
   MemoryBufferCache.cpp
   Module.cpp
   ObjCRuntime.cpp
   OpenMPKinds.cpp
   OperatorPrecedence.cpp
   SanitizerBlacklist.cpp
+  SanitizerSpecialCaseList.cpp
   Sanitizers.cpp
   SourceLocation.cpp
   SourceManager.cpp
   TargetInfo.cpp
   Targets.cpp
   Targets/AArch64.cpp
   Targets/AMDGPU.cpp
   Targets/ARM.cpp

lib/Basic/SanitizerBlacklist.cpp

 //
 //===----------------------------------------------------------------------===//
 #include "clang/Basic/SanitizerBlacklist.h"
 
 using namespace clang;
 
 SanitizerBlacklist::SanitizerBlacklist(
     const std::vector<std::string> &BlacklistPaths, SourceManager &SM)
-    : SCL(llvm::SpecialCaseList::createOrDie(BlacklistPaths)), SM(SM) {}
+    : SSCL(SanitizerSpecialCaseList::createOrDie(BlacklistPaths)), SM(SM) {}
 
-bool SanitizerBlacklist::isBlacklistedGlobal(StringRef GlobalName,
+bool SanitizerBlacklist::isBlacklistedGlobal(SanitizerMask Mask,
+                                             StringRef GlobalName,
                                              StringRef Category) const {
-  return SCL->inSection("global", GlobalName, Category);
+  return SSCL->inSection(Mask, "global", GlobalName, Category);
 }
 
-bool SanitizerBlacklist::isBlacklistedType(StringRef MangledTypeName,
+bool SanitizerBlacklist::isBlacklistedType(SanitizerMask Mask,
+                                           StringRef MangledTypeName,
                                            StringRef Category) const {
-  return SCL->inSection("type", MangledTypeName, Category);
+  return SSCL->inSection(Mask, "type", MangledTypeName, Category);
 }
 
-bool SanitizerBlacklist::isBlacklistedFunction(StringRef FunctionName) const {
-  return SCL->inSection("fun", FunctionName);
+bool SanitizerBlacklist::isBlacklistedFunction(SanitizerMask Mask,
+                                               StringRef FunctionName) const {
+  return SSCL->inSection(Mask, "fun", FunctionName);
 }
 
-bool SanitizerBlacklist::isBlacklistedFile(StringRef FileName,
+bool SanitizerBlacklist::isBlacklistedFile(SanitizerMask Mask,
+                                           StringRef FileName,
                                            StringRef Category) const {
-  return SCL->inSection("src", FileName, Category);
+  return SSCL->inSection(Mask, "src", FileName, Category);
 }
 
-bool SanitizerBlacklist::isBlacklistedLocation(SourceLocation Loc,
+bool SanitizerBlacklist::isBlacklistedLocation(SanitizerMask Mask,
+                                               SourceLocation Loc,
                                                StringRef Category) const {
   return Loc.isValid() &&
-         isBlacklistedFile(SM.getFilename(SM.getFileLoc(Loc)), Category);
+         isBlacklistedFile(Mask, SM.getFilename(SM.getFileLoc(Loc)), Category);
 }
 

lib/Basic/SanitizerSpecialCaseList.cpp

+//===--- SanitizerSpecialCaseList.cpp - SCL for sanitizers ----------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// An extension of SpecialCaseList to allowing querying sections by
+// SanitizerMask.
+//
+//===----------------------------------------------------------------------===//
+#include "clang/Basic/SanitizerSpecialCaseList.h"
+
+using namespace clang;
+
+std::unique_ptr<SanitizerSpecialCaseList>
+SanitizerSpecialCaseList::create(const std::vector<std::string> &Paths,
+                                 std::string &Error) {
+  std::unique_ptr<clang::SanitizerSpecialCaseList> SSCL(
+      new SanitizerSpecialCaseList());
+  if (SSCL->createInternal(Paths, Error)) {
+    SSCL->sanitizerCompile();
+    return SSCL;
+  }
+  return nullptr;
+}
+
+std::unique_ptr<SanitizerSpecialCaseList>
+SanitizerSpecialCaseList::createOrDie(const std::vector<std::string> &Paths) {
+  std::string Error;
+  if (auto SSCL = create(Paths, Error))
+    return SSCL;
+  llvm::report_fatal_error(Error);
+}
+
+void SanitizerSpecialCaseList::sanitizerCompile() {
+  for (auto &S : Sections) {
+    SanitizerMask Mask = 0;
+
+#define SANITIZER(NAME, ID)                                                    \
+  if (S.SectionMatcher->match(NAME))                                           \
+    Mask |= SanitizerKind::ID;
+#define SANITIZER_GROUP(NAME, ID, ALIAS) SANITIZER(NAME, ID)
+
+#include "clang/Basic/Sanitizers.def"
+#undef SANITIZER
+#undef SANITIZER_GROUP
+
+    SanitizerSections.emplace_back(Mask, S.Entries);
+  }
+}
+
+bool SanitizerSpecialCaseList::inSection(SanitizerMask Mask, StringRef Prefix,
+                                         StringRef Query,
+                                         StringRef Category) const {
+  for (auto &S : SanitizerSections)
+    if ((S.Mask & Mask) &&
+        SpecialCaseList::inSection(S.Entries, Prefix, Query, Category))
+      return true;
+
+  return false;
+}

lib/Basic/XRayLists.cpp

: AlwaysInstrument(
           llvm::SpecialCaseList::createOrDie(AlwaysInstrumentPaths)),
       NeverInstrument(llvm::SpecialCaseList::createOrDie(NeverInstrumentPaths)),
       SM(SM) {}
 
 XRayFunctionFilter::ImbueAttribute
 XRayFunctionFilter::shouldImbueFunction(StringRef FunctionName) const {
   // First apply the always instrument list, than if it isn't an "always" see
   // whether it's treated as a "never" instrument function.
-  if (AlwaysInstrument->inSection("fun", FunctionName, "arg1"))
+  if (AlwaysInstrument->inSection("xray_always_instrument", "fun", FunctionName,
+                                  "arg1"))
     return ImbueAttribute::ALWAYS_ARG1;
-  if (AlwaysInstrument->inSection("fun", FunctionName))
+  if (AlwaysInstrument->inSection("xray_always_instrument", "fun",
+                                  FunctionName))
     return ImbueAttribute::ALWAYS;
-  if (NeverInstrument->inSection("fun", FunctionName))
+  if (NeverInstrument->inSection("xray_never_instrument", "fun", FunctionName))
     return ImbueAttribute::NEVER;
   return ImbueAttribute::NONE;
 }
 
 XRayFunctionFilter::ImbueAttribute
 XRayFunctionFilter::shouldImbueFunctionsInFile(StringRef Filename,
                                                StringRef Category) const {
-  if (AlwaysInstrument->inSection("src", Filename, Category))
+  if (AlwaysInstrument->inSection("xray_always_instrument", "src", Filename,
+                                  Category))
     return ImbueAttribute::ALWAYS;
-  if (NeverInstrument->inSection("src", Filename, Category))
+  if (NeverInstrument->inSection("xray_never_instrument", "src", Filename,
+                                 Category))
     return ImbueAttribute::NEVER;
   return ImbueAttribute::NONE;
 }
 
 XRayFunctionFilter::ImbueAttribute
 XRayFunctionFilter::shouldImbueLocation(SourceLocation Loc,
                                         StringRef Category) const {
   if (!Loc.isValid())
     return ImbueAttribute::NONE;
   return this->shouldImbueFunctionsInFile(SM.getFilename(SM.getFileLoc(Loc)),
                                           Category);
 }

lib/CodeGen/CGClass.cpp

 void CodeGenFunction::EmitVTablePtrCheck(const CXXRecordDecl *RD,
                                          llvm::Value *VTable,
                                          CFITypeCheckKind TCK,
                                          SourceLocation Loc) {
   if (!CGM.getCodeGenOpts().SanitizeCfiCrossDso &&
       !CGM.HasHiddenLTOVisibility(RD))
     return;
 
-  std::string TypeName = RD->getQualifiedNameAsString();
-  if (getContext().getSanitizerBlacklist().isBlacklistedType(TypeName))
-    return;
-
-  SanitizerScope SanScope(this);
+  SanitizerMask M;
   llvm::SanitizerStatKind SSK;
   switch (TCK) {
   case CFITCK_VCall:
+    M = SanitizerKind::CFIVCall;
     SSK = llvm::SanStat_CFI_VCall;
     break;
   case CFITCK_NVCall:
+    M = SanitizerKind::CFINVCall;
     SSK = llvm::SanStat_CFI_NVCall;
     break;
   case CFITCK_DerivedCast:
+    M = SanitizerKind::CFIDerivedCast;
     SSK = llvm::SanStat_CFI_DerivedCast;
     break;
   case CFITCK_UnrelatedCast:
+    M = SanitizerKind::CFIUnrelatedCast;
     SSK = llvm::SanStat_CFI_UnrelatedCast;
     break;
   case CFITCK_ICall:
     llvm_unreachable("not expecting CFITCK_ICall");
   }
+
+  std::string TypeName = RD->getQualifiedNameAsString();
+  if (getContext().getSanitizerBlacklist().isBlacklistedType(M, TypeName))
+    return;
+
+  SanitizerScope SanScope(this);
   EmitSanitizerStatReport(SSK);
 
   llvm::Metadata *MD =
       CGM.CreateMetadataIdentifierForType(QualType(RD->getTypeForDecl(), 0));
   llvm::Value *TypeId = llvm::MetadataAsValue::get(getLLVMContext(), MD);
 
   llvm::Value *CastedVTable = Builder.CreateBitCast(VTable, Int8PtrTy);
   llvm::Value *TypeTest = Builder.CreateCall(
       CGM.getIntrinsic(llvm::Intrinsic::type_test), {CastedVTable, TypeId});
 
-  SanitizerMask M;
-  switch (TCK) {
-  case CFITCK_VCall:
-    M = SanitizerKind::CFIVCall;
-    break;
-  case CFITCK_NVCall:
-    M = SanitizerKind::CFINVCall;
-    break;
-  case CFITCK_DerivedCast:
-    M = SanitizerKind::CFIDerivedCast;
-    break;
-  case CFITCK_UnrelatedCast:
-    M = SanitizerKind::CFIUnrelatedCast;
-    break;
-  case CFITCK_ICall:
-    llvm_unreachable("not expecting CFITCK_ICall");
-  }
-
   llvm::Constant *StaticData[] = {
       llvm::ConstantInt::get(Int8Ty, TCK),
       EmitCheckSourceLocation(Loc),
       EmitCheckTypeDescriptor(QualType(RD->getTypeForDecl(), 0)),
   };
 
   auto CrossDsoTypeId = CGM.CreateCrossDsoCfiTypeId(MD);
   if (CGM.getCodeGenOpts().SanitizeCfiCrossDso && CrossDsoTypeId) {

 bool CodeGenFunction::ShouldEmitVTableTypeCheckedLoad(const CXXRecordDecl *RD) {
   if (!CGM.getCodeGenOpts().WholeProgramVTables ||
       !SanOpts.has(SanitizerKind::CFIVCall) ||
       !CGM.getCodeGenOpts().SanitizeTrap.has(SanitizerKind::CFIVCall) ||
       !CGM.HasHiddenLTOVisibility(RD))
     return false;
 
   std::string TypeName = RD->getQualifiedNameAsString();
-  return !getContext().getSanitizerBlacklist().isBlacklistedType(TypeName);
+  return !getContext().getSanitizerBlacklist().isBlacklistedType(
+      SanitizerKind::CFIVCall, TypeName);
 }
 
 llvm::Value *CodeGenFunction::EmitVTableTypeCheckedLoad(
     const CXXRecordDecl *RD, llvm::Value *VTable, uint64_t VTableByteOffset) {
   SanitizerScope SanScope(this);
 
   EmitSanitizerStatReport(llvm::SanStat_CFI_VCall);
 

lib/CodeGen/CGDeclCXX.cpp

llvm::Function *CodeGenModule::CreateGlobalInitOrDestructFunction(
 
   SetInternalFunctionAttributes(nullptr, Fn, FI);
 
   Fn->setCallingConv(getRuntimeCC());
 
   if (!getLangOpts().Exceptions)
     Fn->setDoesNotThrow();
 
-  if (!isInSanitizerBlacklist(Fn, Loc)) {
-    if (getLangOpts().Sanitize.hasOneOf(SanitizerKind::Address |
-                                        SanitizerKind::KernelAddress))
-      Fn->addFnAttr(llvm::Attribute::SanitizeAddress);
-    if (getLangOpts().Sanitize.has(SanitizerKind::Thread))
-      Fn->addFnAttr(llvm::Attribute::SanitizeThread);
-    if (getLangOpts().Sanitize.has(SanitizerKind::Memory))
-      Fn->addFnAttr(llvm::Attribute::SanitizeMemory);
-    if (getLangOpts().Sanitize.has(SanitizerKind::SafeStack))
-      Fn->addFnAttr(llvm::Attribute::SafeStack);
-  }
+  if (getLangOpts().Sanitize.has(SanitizerKind::Address) &&
+      !isInSanitizerBlacklist(SanitizerKind::Address, Fn, Loc))
+
+  if (getLangOpts().Sanitize.has(SanitizerKind::KernelAddress) &&
+      !isInSanitizerBlacklist(SanitizerKind::KernelAddress, Fn, Loc))
+    Fn->addFnAttr(llvm::Attribute::SanitizeAddress);
+
+  if (getLangOpts().Sanitize.has(SanitizerKind::Thread) &&
+      !isInSanitizerBlacklist(SanitizerKind::Thread, Fn, Loc))
+
+  if (getLangOpts().Sanitize.has(SanitizerKind::Memory) &&
+      !isInSanitizerBlacklist(SanitizerKind::Memory, Fn, Loc))
+
+  if (getLangOpts().Sanitize.has(SanitizerKind::SafeStack) &&
+      !isInSanitizerBlacklist(SanitizerKind::SafeStack, Fn, Loc))
 
   return Fn;
 }
 
 /// Create a global pointer to a function that will initialize a global
 /// variable.  The user has requested that this pointer be emitted in a specific
 /// section.
 void CodeGenModule::EmitPointerToInitFunc(const VarDecl *D,

lib/CodeGen/CGExpr.cpp

if (SanOpts.has(SanitizerKind::Vptr) &&
     //        being the implementation happens to be deterministic.
     SmallString<64> MangledName;
     llvm::raw_svector_ostream Out(MangledName);
     CGM.getCXXABI().getMangleContext().mangleCXXRTTI(Ty.getUnqualifiedType(),
                                                      Out);
 
     // Blacklist based on the mangled type.
     if (!CGM.getContext().getSanitizerBlacklist().isBlacklistedType(
-            Out.str())) {
+            SanitizerKind::Vptr, Out.str())) {
       llvm::hash_code TypeHash = hash_value(Out.str());
 
       // Load the vptr, and compute hash_16_bytes(TypeHash, vptr).
       llvm::Value *Low = llvm::ConstantInt::get(Int64Ty, TypeHash);
       llvm::Type *VPtrTy = llvm::PointerType::get(IntPtrTy, 0);
       Address VPtrAddr(Builder.CreateBitCast(Ptr, VPtrTy), getPointerAlign());
       llvm::Value *VPtrVal = Builder.CreateLoad(VPtrAddr);
       llvm::Value *High = Builder.CreateZExt(VPtrVal, Int64Ty);

lib/CodeGen/CodeGenFunction.cpp

if (const auto *FD = dyn_cast_or_null<FunctionDecl>(D))
     if (FD->usesSEHTry())
       CurSEHParent = FD;
   CurFuncDecl = (D ? D->getNonClosureContext() : nullptr);
   FnRetTy = RetTy;
   CurFn = Fn;
   CurFnInfo = &FnInfo;
   assert(CurFn->isDeclaration() && "Function already has body?");
 
-  if (CGM.isInSanitizerBlacklist(Fn, Loc))
-    SanOpts.clear();
+  // If this function has been blacklisted for any of the enabled sanitizers,
+  // disable the sanitizer for the function.
+  do {
+#define SANITIZER(NAME, ID)                                                    \
+  if (SanOpts.empty())                                                         \
+    break;                                                                     \
+  if (SanOpts.has(SanitizerKind::ID))                                          \
+    if (CGM.isInSanitizerBlacklist(SanitizerKind::ID, Fn, Loc))                \
+      SanOpts.set(SanitizerKind::ID, false);
+
+#include "clang/Basic/Sanitizers.def"
+#undef SANITIZER
+  } while (0);
 
   if (D) {
     // Apply the no_sanitize* attributes to SanOpts.
     for (auto Attr : D->specific_attrs<NoSanitizeAttr>())
       SanOpts.Mask &= ~Attr->getMask();
   }
 
   // Apply sanitizer attributes to the function.

lib/CodeGen/CodeGenModule.h

public:
   llvm::Constant *EmitAnnotateAttr(llvm::GlobalValue *GV,
                                    const AnnotateAttr *AA,
                                    SourceLocation L);
 
   /// Add global annotations that are set on D, for the global GV. Those
   /// annotations are emitted during finalization of the LLVM code.
   void AddGlobalAnnotations(const ValueDecl *D, llvm::GlobalValue *GV);
 
-  bool isInSanitizerBlacklist(llvm::Function *Fn, SourceLocation Loc) const;
+  bool isInSanitizerBlacklist(SanitizerMask Kind, llvm::Function *Fn,
+                              SourceLocation Loc) const;
 
   bool isInSanitizerBlacklist(llvm::GlobalVariable *GV, SourceLocation Loc,
                               QualType Ty,
                               StringRef Category = StringRef()) const;
 
   /// Imbue XRay attributes to a function, applying the always/never attribute
   /// lists in the process. Returns true if we did imbue attributes this way,
   /// false otherwise.

lib/CodeGen/CodeGenModule.cpp

 void CodeGenModule::AddGlobalAnnotations(const ValueDecl *D,
                                          llvm::GlobalValue *GV) {
   assert(D->hasAttr<AnnotateAttr>() && "no annotate attribute");
   // Get the struct elements for these annotations.
   for (const auto *I : D->specific_attrs<AnnotateAttr>())
     Annotations.push_back(EmitAnnotateAttr(GV, I, D->getLocation()));
 }
 
-bool CodeGenModule::isInSanitizerBlacklist(llvm::Function *Fn,
+bool CodeGenModule::isInSanitizerBlacklist(SanitizerMask Kind,
+                                           llvm::Function *Fn,
                                            SourceLocation Loc) const {
   const auto &SanitizerBL = getContext().getSanitizerBlacklist();
   // Blacklist by function name.
-  if (SanitizerBL.isBlacklistedFunction(Fn->getName()))
+  if (SanitizerBL.isBlacklistedFunction(Kind, Fn->getName()))
     return true;
   // Blacklist by location.
   if (Loc.isValid())
-    return SanitizerBL.isBlacklistedLocation(Loc);
+    return SanitizerBL.isBlacklistedLocation(Kind, Loc);
   // If location is unknown, this may be a compiler-generated function. Assume
   // it's located in the main file.
   auto &SM = Context.getSourceManager();
   if (const auto *MainFile = SM.getFileEntryForID(SM.getMainFileID())) {
-    return SanitizerBL.isBlacklistedFile(MainFile->getName());
+    return SanitizerBL.isBlacklistedFile(Kind, MainFile->getName());
   }
   return false;
 }
 
 bool CodeGenModule::isInSanitizerBlacklist(llvm::GlobalVariable *GV,
                                            SourceLocation Loc, QualType Ty,
                                            StringRef Category) const {
   // For now globals can be blacklisted only in ASan and KASan.
-  if (!LangOpts.Sanitize.hasOneOf(
-          SanitizerKind::Address | SanitizerKind::KernelAddress))
+  const SanitizerMask ASanMask =
+      SanitizerKind::Address | SanitizerKind::KernelAddress;
+  if (!LangOpts.Sanitize.hasOneOf(ASanMask))
     return false;
+  // Only select blacklisted entries from the enabled sanitizer.
+  const SanitizerMask BLMask = ASanMask & LangOpts.Sanitize.Mask;
   const auto &SanitizerBL = getContext().getSanitizerBlacklist();
-  if (SanitizerBL.isBlacklistedGlobal(GV->getName(), Category))
+  if (SanitizerBL.isBlacklistedGlobal(BLMask, GV->getName(), Category))
     return true;
-  if (SanitizerBL.isBlacklistedLocation(Loc, Category))
+  if (SanitizerBL.isBlacklistedLocation(BLMask, Loc, Category))
     return true;
   // Check global type.
   if (!Ty.isNull()) {
     // Drill down the array types: if global variable of a fixed type is
     // blacklisted, we also don't instrument arrays of them.
     while (auto AT = dyn_cast<ArrayType>(Ty.getTypePtr()))
       Ty = AT->getElementType();
     Ty = Ty.getCanonicalType().getUnqualifiedType();
     // We allow to blacklist only record types (classes, structs etc.)
     if (Ty->isRecordType()) {
       std::string TypeStr = Ty.getAsString(getContext().getPrintingPolicy());
-      if (SanitizerBL.isBlacklistedType(TypeStr, Category))
+      if (SanitizerBL.isBlacklistedType(BLMask, TypeStr, Category))
         return true;
     }
   }
   return false;
 }
 
 bool CodeGenModule::imbueXRayAttrs(llvm::Function *Fn, SourceLocation Loc,
                                    StringRef Category) const {

test/CodeGen/Inputs/sanitizer-special-case-list.sanitized.txt

+[unsigned-integer-overflow]
+fun:*cfi*
+[cfi]
+fun:*overflow*

test/CodeGen/Inputs/sanitizer-special-case-list.unsanitized1.txt

+fun:*cfi*
+fun:*overflow*

test/CodeGen/Inputs/sanitizer-special-case-list.unsanitized2.txt

+[cfi]
+fun:*cfi*
+[unsigned-integer-overflow]
+fun:*overflow*

test/CodeGen/Inputs/sanitizer-special-case-list.unsanitized3.txt

+[cfi-icall]
+fun:*cfi*
+[unsigned-integer-overflow]
+fun:*overflow*

test/CodeGen/Inputs/sanitizer-special-case-list.unsanitized4.txt

+[c*]
+fun:*cfi*
+[u*]
+fun:*overflow*

test/CodeGen/sanitizer-special-case-list.c

+// Verify that blacklist sections correctly select sanitizers to apply blacklist entries to.
+//
+// RUN: %clang_cc1 -fsanitize=unsigned-integer-overflow,cfi-icall -fsanitize-blacklist=%S/Inputs/sanitizer-special-case-list.unsanitized1.txt -emit-llvm %s -o - | FileCheck %s --check-prefix=UNSANITIZED
+// RUN: %clang_cc1 -fsanitize=unsigned-integer-overflow,cfi-icall -fsanitize-blacklist=%S/Inputs/sanitizer-special-case-list.unsanitized2.txt -emit-llvm %s -o - | FileCheck %s --check-prefix=UNSANITIZED
+// RUN: %clang_cc1 -fsanitize=unsigned-integer-overflow,cfi-icall -fsanitize-blacklist=%S/Inputs/sanitizer-special-case-list.unsanitized3.txt -emit-llvm %s -o - | FileCheck %s --check-prefix=UNSANITIZED
+// RUN: %clang_cc1 -fsanitize=unsigned-integer-overflow,cfi-icall -fsanitize-blacklist=%S/Inputs/sanitizer-special-case-list.unsanitized4.txt -emit-llvm %s -o - | FileCheck %s --check-prefix=UNSANITIZED
+//
+// RUN: %clang_cc1 -fsanitize=unsigned-integer-overflow,cfi-icall -fsanitize-blacklist=%S/Inputs/sanitizer-special-case-list.sanitized.txt -emit-llvm %s -o - | FileCheck %s --check-prefix=SANITIZED
+
+unsigned i;
+
+// SANITIZED: @overflow
+// UNSANITIZED: @overflow
+unsigned overflow() {
+  // SANITIZED: call {{.*}}void @__ubsan
+  // UNSANITIZED-NOT: call {{.*}}void @__ubsan
+  return i * 37;
+}
+
+// SANITIZED: @cfi
+// UNSANITIZED: @cfi
+void cfi(void (*fp)()) {
+  // SANITIZED: llvm.type.test
+  // UNSANITIZED-NOT: llvm.type.test
+  fp();
+}

test/CodeGenCXX/cfi-blacklist.cpp

 // RUN: %clang_cc1 -triple %itanium_abi_triple -fvisibility hidden -fms-extensions -fsanitize=cfi-vcall -emit-llvm -o - %s | FileCheck --check-prefix=CHECK --check-prefix=NOBL %s
-// RUN: echo "type:std::*" > %t.txt
-// RUN: %clang_cc1 -triple %itanium_abi_triple -fvisibility hidden -fms-extensions -fsanitize=cfi-vcall -fsanitize-blacklist=%t.txt -emit-llvm -o - %s | FileCheck --check-prefix=CHECK --check-prefix=NOSTD %s
+
+// Check that blacklisting cfi and cfi-vcall work correctly
+// RUN: echo "[cfi-vcall]" > %t.vcall.txt
+// RUN: echo "type:std::*" >> %t.vcall.txt
+// RUN: %clang_cc1 -triple %itanium_abi_triple -fvisibility hidden -fms-extensions -fsanitize=cfi-vcall -fsanitize-blacklist=%t.vcall.txt -emit-llvm -o - %s | FileCheck --check-prefix=CHECK --check-prefix=NOSTD %s
+//
+// RUN: echo "[cfi]" > %t.cfi.txt
+// RUN: echo "type:std::*" >> %t.cfi.txt
+// RUN: %clang_cc1 -triple %itanium_abi_triple -fvisibility hidden -fms-extensions -fsanitize=cfi-vcall -fsanitize-blacklist=%t.cfi.txt -emit-llvm -o - %s | FileCheck --check-prefix=CHECK --check-prefix=NOSTD %s
+
+// Check that blacklisting non-vcall modes does not affect vcalls
+// RUN: echo "[cfi-icall|cfi-nvcall|cfi-cast-strict|cfi-derived-cast|cfi-unrelated-cast]" > %t.other.txt
+// RUN: echo "type:std::*" >> %t.other.txt
+// RUN: %clang_cc1 -triple %itanium_abi_triple -fvisibility hidden -fms-extensions -fsanitize=cfi-vcall -fsanitize-blacklist=%t.other.txt -emit-llvm -o - %s | FileCheck --check-prefix=CHECK --check-prefix=NOBL %s
 
 struct S1 {
   virtual void f();
 };
 
 namespace std {
 
 struct S2 {