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[NewPM] Second attempt at porting ASan

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This is the second attempt to port ASan to new PM after D52739. This takes the
initialization requried by ASan from the Module by moving it into a separate
class with it's own analysis that the new PM ASan can use.

Changes:
- Split AddressSanitizer into 2 passes: 1 for the instrumentation on the
  function, and 1 for the pass itself which creates an instance of the first
  during it's run. The same is done for AddressSanitizerModule.
- Add new PM AddressSanitizer and AddressSanitizerModule.
- Add legacy and new PM analyses for reading data needed to initialize ASan with.
- Removed DominatorTree dependency from ASan since it was unused.
- Move GlobalsMetadata and ShadowMapping out of anonymous namespace since the
  new PM analysis holds these 2 classes and will need to expose them.

Differential Revision: https://reviews.llvm.org/D56470

llvm-svn: 353985
This commit is contained in:
Leonard Chan 2019-02-13 22:22:48 +00:00
parent dd6cadae89
commit 9cbbc6a096
9 changed files with 418 additions and 197 deletions
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3
bindings/go/llvm/InstrumentationBindings.cpp
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@ -15,6 +15,7 @@
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/IR/Module.h"
#include "llvm/Transforms/Instrumentation.h"
#include "llvm/Transforms/Instrumentation/AddressSanitizer.h"
#include "llvm/Transforms/Instrumentation/MemorySanitizer.h"
#include "llvm/Transforms/Instrumentation/ThreadSanitizer.h"
@ -25,7 +26,7 @@ void LLVMAddAddressSanitizerFunctionPass(LLVMPassManagerRef PM) {
}
void LLVMAddAddressSanitizerModulePass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createAddressSanitizerModulePass());
unwrap(PM)->add(createModuleAddressSanitizerLegacyPassPass());
}
void LLVMAddThreadSanitizerPass(LLVMPassManagerRef PM) {

5
include/llvm/InitializePasses.h
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@ -64,8 +64,9 @@ void initializeAAEvalLegacyPassPass(PassRegistry&);
void initializeAAResultsWrapperPassPass(PassRegistry&);
void initializeADCELegacyPassPass(PassRegistry&);
void initializeAddDiscriminatorsLegacyPassPass(PassRegistry&);
void initializeAddressSanitizerModulePass(PassRegistry&);
void initializeAddressSanitizerPass(PassRegistry&);
void initializeModuleAddressSanitizerLegacyPassPass(PassRegistry &);
void initializeASanGlobalsMetadataWrapperPassPass(PassRegistry &);
void initializeAddressSanitizerLegacyPassPass(PassRegistry &);
void initializeAggressiveInstCombinerLegacyPassPass(PassRegistry&);
void initializeAliasSetPrinterPass(PassRegistry&);
void initializeAlignmentFromAssumptionsPass(PassRegistry&);

9
include/llvm/Transforms/Instrumentation.h
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@ -142,15 +142,6 @@ struct InstrProfOptions {
ModulePass *createInstrProfilingLegacyPass(
const InstrProfOptions &Options = InstrProfOptions());
// Insert AddressSanitizer (address sanity checking) instrumentation
FunctionPass *createAddressSanitizerFunctionPass(bool CompileKernel = false,
bool Recover = false,
bool UseAfterScope = false);
ModulePass *createAddressSanitizerModulePass(bool CompileKernel = false,
bool Recover = false,
bool UseGlobalsGC = true,
bool UseOdrIndicator = true);
FunctionPass *createHWAddressSanitizerPass(bool CompileKernel = false,
bool Recover = false);

143
include/llvm/Transforms/Instrumentation/AddressSanitizer.h Normal file
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@ -0,0 +1,143 @@
//===--------- Definition of the AddressSanitizer class ---------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares the AddressSanitizer class which is a port of the legacy
// AddressSanitizer pass to use the new PassManager infrastructure.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TRANSFORMS_INSTRUMENTATION_ADDRESSSANITIZERPASS_H
#define LLVM_TRANSFORMS_INSTRUMENTATION_ADDRESSSANITIZERPASS_H
#include "llvm/IR/Function.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/PassManager.h"
namespace llvm {
/// Frontend-provided metadata for source location.
struct LocationMetadata {
StringRef Filename;
int LineNo = 0;
int ColumnNo = 0;
LocationMetadata() = default;
bool empty() const { return Filename.empty(); }
void parse(MDNode *MDN);
};
/// Frontend-provided metadata for global variables.
class GlobalsMetadata {
public:
struct Entry {
LocationMetadata SourceLoc;
StringRef Name;
bool IsDynInit = false;
bool IsBlacklisted = false;
Entry() = default;
};
/// Create a default uninitialized GlobalsMetadata instance.
GlobalsMetadata() = default;
/// Create an initialized GlobalsMetadata instance.
GlobalsMetadata(Module &M);
/// Returns metadata entry for a given global.
Entry get(GlobalVariable *G) const {
auto Pos = Entries.find(G);
return (Pos != Entries.end()) ? Pos->second : Entry();
}
/// Handle invalidation from the pass manager.
/// These results are never invalidated.
bool invalidate(Module &, const PreservedAnalyses &,
ModuleAnalysisManager::Invalidator &) {
return false;
}
bool invalidate(Function &, const PreservedAnalyses &,
FunctionAnalysisManager::Invalidator &) {
return false;
}
private:
DenseMap<GlobalVariable *, Entry> Entries;
};
/// The ASanGlobalsMetadataAnalysis initializes and returns a GlobalsMetadata
/// object. More specifically, ASan requires looking at all globals registered
/// in 'llvm.asan.globals' before running, which only depends on reading module
/// level metadata. This analysis is required to run before running the
/// AddressSanitizerPass since it collects that metadata.
/// The legacy pass manager equivalent of this is ASanGlobalsMetadataLegacyPass.
class ASanGlobalsMetadataAnalysis
: public AnalysisInfoMixin<ASanGlobalsMetadataAnalysis> {
public:
using Result = GlobalsMetadata;
Result run(Module &, ModuleAnalysisManager &);
private:
friend AnalysisInfoMixin<ASanGlobalsMetadataAnalysis>;
static AnalysisKey Key;
};
/// Public interface to the address sanitizer pass for instrumenting code to
/// check for various memory errors at runtime.
///
/// The sanitizer itself is a function pass that works by inserting various
/// calls to the ASan runtime library functions. The runtime library essentially
/// replaces malloc() and free() with custom implementations that allow regions
/// surrounding requested memory to be checked for invalid accesses.
class AddressSanitizerPass : public PassInfoMixin<AddressSanitizerPass> {
public:
explicit AddressSanitizerPass(bool CompileKernel = false,
bool Recover = false,
bool UseAfterScope = false);
PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
private:
bool CompileKernel;
bool Recover;
bool UseAfterScope;
};
/// Public interface to the address sanitizer module pass for instrumenting code
/// to check for various memory errors.
///
/// This adds 'asan.module_ctor' to 'llvm.global_ctors'. This pass may also
/// run intependently of the function address sanitizer.
class ModuleAddressSanitizerPass
: public PassInfoMixin<ModuleAddressSanitizerPass> {
public:
explicit ModuleAddressSanitizerPass(bool CompileKernel = false,
bool Recover = false,
bool UseGlobalGC = true,
bool UseOdrIndicator = false);
PreservedAnalyses run(Module &M, ModuleAnalysisManager &AM);
private:
bool CompileKernel;
bool Recover;
bool UseGlobalGC;
bool UseOdrIndicator;
};
// Insert AddressSanitizer (address sanity checking) instrumentation
FunctionPass *createAddressSanitizerFunctionPass(bool CompileKernel = false,
bool Recover = false,
bool UseAfterScope = false);
ModulePass *createModuleAddressSanitizerLegacyPassPass(
bool CompileKernel = false, bool Recover = false, bool UseGlobalsGC = true,
bool UseOdrIndicator = true);
} // namespace llvm
#endif

3
lib/Passes/PassBuilder.cpp
View File

@ -88,14 +88,15 @@
#include "llvm/Transforms/IPO/WholeProgramDevirt.h"
#include "llvm/Transforms/InstCombine/InstCombine.h"
#include "llvm/Transforms/Instrumentation.h"
#include "llvm/Transforms/Instrumentation/AddressSanitizer.h"
#include "llvm/Transforms/Instrumentation/BoundsChecking.h"
#include "llvm/Transforms/Instrumentation/CGProfile.h"
#include "llvm/Transforms/Instrumentation/ControlHeightReduction.h"
#include "llvm/Transforms/Instrumentation/GCOVProfiler.h"
#include "llvm/Transforms/Instrumentation/InstrProfiling.h"
#include "llvm/Transforms/Instrumentation/MemorySanitizer.h"
#include "llvm/Transforms/Instrumentation/ThreadSanitizer.h"
#include "llvm/Transforms/Instrumentation/PGOInstrumentation.h"
#include "llvm/Transforms/Instrumentation/ThreadSanitizer.h"
#include "llvm/Transforms/Scalar/ADCE.h"
#include "llvm/Transforms/Scalar/AlignmentFromAssumptions.h"
#include "llvm/Transforms/Scalar/BDCE.h"

3
lib/Passes/PassRegistry.def
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@ -27,6 +27,7 @@ MODULE_ANALYSIS("stack-safety", StackSafetyGlobalAnalysis())
MODULE_ANALYSIS("targetlibinfo", TargetLibraryAnalysis())
MODULE_ANALYSIS("verify", VerifierAnalysis())
MODULE_ANALYSIS("pass-instrumentation", PassInstrumentationAnalysis(PIC))
MODULE_ANALYSIS("asan-globals-md", ASanGlobalsMetadataAnalysis())
#ifndef MODULE_ALIAS_ANALYSIS
#define MODULE_ALIAS_ANALYSIS(NAME, CREATE_PASS) \
@ -81,6 +82,7 @@ MODULE_PASS("strip-dead-prototypes", StripDeadPrototypesPass())
MODULE_PASS("synthetic-counts-propagation", SyntheticCountsPropagation())
MODULE_PASS("wholeprogramdevirt", WholeProgramDevirtPass(nullptr, nullptr))
MODULE_PASS("verify", VerifierPass())
MODULE_PASS("asan-module", ModuleAddressSanitizerPass(false, false, true, false))
#undef MODULE_PASS
#ifndef CGSCC_ANALYSIS
@ -231,6 +233,7 @@ FUNCTION_PASS("verify<regions>", RegionInfoVerifierPass())
FUNCTION_PASS("view-cfg", CFGViewerPass())
FUNCTION_PASS("view-cfg-only", CFGOnlyViewerPass())
FUNCTION_PASS("transform-warning", WarnMissedTransformationsPass())
FUNCTION_PASS("asan", AddressSanitizerPass(false, false, false))
FUNCTION_PASS("msan", MemorySanitizerPass({}))
FUNCTION_PASS("tsan", ThreadSanitizerPass())
#undef FUNCTION_PASS

441
lib/Transforms/Instrumentation/AddressSanitizer.cpp
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@ -12,6 +12,7 @@
//
//===----------------------------------------------------------------------===//
#include "llvm/Transforms/Instrumentation/AddressSanitizer.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/DepthFirstIterator.h"
@ -24,7 +25,6 @@
#include "llvm/ADT/Twine.h"
#include "llvm/Analysis/MemoryBuiltins.h"
#include "llvm/Analysis/TargetLibraryInfo.h"
#include "llvm/Transforms/Utils/Local.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/BinaryFormat/MachO.h"
#include "llvm/IR/Argument.h"
@ -71,6 +71,7 @@
#include "llvm/Transforms/Instrumentation.h"
#include "llvm/Transforms/Utils/ASanStackFrameLayout.h"
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
#include "llvm/Transforms/Utils/Local.h"
#include "llvm/Transforms/Utils/ModuleUtils.h"
#include "llvm/Transforms/Utils/PromoteMemToReg.h"
#include <algorithm>
@ -392,87 +393,6 @@ STATISTIC(NumOptimizedAccessesToStackVar,
namespace {
/// Frontend-provided metadata for source location.
struct LocationMetadata {
StringRef Filename;
int LineNo = 0;
int ColumnNo = 0;
LocationMetadata() = default;
bool empty() const { return Filename.empty(); }
void parse(MDNode *MDN) {
assert(MDN->getNumOperands() == 3);
MDString *DIFilename = cast<MDString>(MDN->getOperand(0));
Filename = DIFilename->getString();
LineNo =
mdconst::extract<ConstantInt>(MDN->getOperand(1))->getLimitedValue();
ColumnNo =
mdconst::extract<ConstantInt>(MDN->getOperand(2))->getLimitedValue();
}
};
/// Frontend-provided metadata for global variables.
class GlobalsMetadata {
public:
struct Entry {
LocationMetadata SourceLoc;
StringRef Name;
bool IsDynInit = false;
bool IsBlacklisted = false;
Entry() = default;
};
GlobalsMetadata() = default;
void reset() {
inited_ = false;
Entries.clear();
}
void init(Module &M) {
assert(!inited_);
inited_ = true;
NamedMDNode *Globals = M.getNamedMetadata("llvm.asan.globals");
if (!Globals) return;
for (auto MDN : Globals->operands()) {
// Metadata node contains the global and the fields of "Entry".
assert(MDN->getNumOperands() == 5);
auto *V = mdconst::extract_or_null<Constant>(MDN->getOperand(0));
// The optimizer may optimize away a global entirely.
if (!V) continue;
auto *StrippedV = V->stripPointerCasts();
auto *GV = dyn_cast<GlobalVariable>(StrippedV);
if (!GV) continue;
// We can already have an entry for GV if it was merged with another
// global.
Entry &E = Entries[GV];
if (auto *Loc = cast_or_null<MDNode>(MDN->getOperand(1)))
E.SourceLoc.parse(Loc);
if (auto *Name = cast_or_null<MDString>(MDN->getOperand(2)))
E.Name = Name->getString();
ConstantInt *IsDynInit =
mdconst::extract<ConstantInt>(MDN->getOperand(3));
E.IsDynInit |= IsDynInit->isOne();
ConstantInt *IsBlacklisted =
mdconst::extract<ConstantInt>(MDN->getOperand(4));
E.IsBlacklisted |= IsBlacklisted->isOne();
}
}
/// Returns metadata entry for a given global.
Entry get(GlobalVariable *G) const {
auto Pos = Entries.find(G);
return (Pos != Entries.end()) ? Pos->second : Entry();
}
private:
bool inited_ = false;
DenseMap<GlobalVariable *, Entry> Entries;
};
/// This struct defines the shadow mapping using the rule:
/// shadow = (mem >> Scale) ADD-or-OR Offset.
/// If InGlobal is true, then
@ -606,27 +526,53 @@ static size_t RedzoneSizeForScale(int MappingScale) {
namespace {
/// AddressSanitizer: instrument the code in module to find memory bugs.
struct AddressSanitizer : public FunctionPass {
// Pass identification, replacement for typeid
/// Module analysis for getting various metadata about the module.
class ASanGlobalsMetadataWrapperPass : public ModulePass {
public:
static char ID;
explicit AddressSanitizer(bool CompileKernel = false, bool Recover = false,
bool UseAfterScope = false)
: FunctionPass(ID), UseAfterScope(UseAfterScope || ClUseAfterScope) {
this->Recover = ClRecover.getNumOccurrences() > 0 ? ClRecover : Recover;
this->CompileKernel = ClEnableKasan.getNumOccurrences() > 0 ?
ClEnableKasan : CompileKernel;
initializeAddressSanitizerPass(*PassRegistry::getPassRegistry());
ASanGlobalsMetadataWrapperPass() : ModulePass(ID) {
initializeASanGlobalsMetadataWrapperPassPass(
*PassRegistry::getPassRegistry());
}
bool runOnModule(Module &M) override {
GlobalsMD = GlobalsMetadata(M);
return false;
}
StringRef getPassName() const override {
return "AddressSanitizerFunctionPass";
return "ASanGlobalsMetadataWrapperPass";
}
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.addRequired<DominatorTreeWrapperPass>();
AU.addRequired<TargetLibraryInfoWrapperPass>();
AU.setPreservesAll();
}
GlobalsMetadata &getGlobalsMD() { return GlobalsMD; }
private:
GlobalsMetadata GlobalsMD;
};
char ASanGlobalsMetadataWrapperPass::ID = 0;
/// AddressSanitizer: instrument the code in module to find memory bugs.
struct AddressSanitizer {
AddressSanitizer(Module &M, GlobalsMetadata &GlobalsMD,
bool CompileKernel = false, bool Recover = false,
bool UseAfterScope = false)
: UseAfterScope(UseAfterScope || ClUseAfterScope), GlobalsMD(GlobalsMD) {
this->Recover = ClRecover.getNumOccurrences() > 0 ? ClRecover : Recover;
this->CompileKernel =
ClEnableKasan.getNumOccurrences() > 0 ? ClEnableKasan : CompileKernel;
C = &(M.getContext());
LongSize = M.getDataLayout().getPointerSizeInBits();
IntptrTy = Type::getIntNTy(*C, LongSize);
TargetTriple = Triple(M.getTargetTriple());
Mapping = getShadowMapping(TargetTriple, LongSize, this->CompileKernel);
}
uint64_t getAllocaSizeInBytes(const AllocaInst &AI) const {
@ -671,14 +617,10 @@ struct AddressSanitizer : public FunctionPass {
Value *SizeArgument, uint32_t Exp);
void instrumentMemIntrinsic(MemIntrinsic *MI);
Value *memToShadow(Value *Shadow, IRBuilder<> &IRB);
bool runOnFunction(Function &F) override;
bool instrumentFunction(Function &F, const TargetLibraryInfo *TLI);
bool maybeInsertAsanInitAtFunctionEntry(Function &F);
void maybeInsertDynamicShadowAtFunctionEntry(Function &F);
void markEscapedLocalAllocas(Function &F);
bool doInitialization(Module &M) override;
bool doFinalization(Module &M) override;
DominatorTree &getDominatorTree() const { return *DT; }
private:
friend struct FunctionStackPoisoner;
@ -714,7 +656,6 @@ private:
bool UseAfterScope;
Type *IntptrTy;
ShadowMapping Mapping;
DominatorTree *DT;
FunctionCallee AsanHandleNoReturnFunc;
FunctionCallee AsanPtrCmpFunction, AsanPtrSubFunction;
Constant *AsanShadowGlobal;
@ -734,16 +675,49 @@ private:
DenseMap<const AllocaInst *, bool> ProcessedAllocas;
};
class AddressSanitizerModule : public ModulePass {
class AddressSanitizerLegacyPass : public FunctionPass {
public:
// Pass identification, replacement for typeid
static char ID;
explicit AddressSanitizerModule(bool CompileKernel = false,
bool Recover = false,
bool UseGlobalsGC = true,
bool UseOdrIndicator = false)
: ModulePass(ID), UseGlobalsGC(UseGlobalsGC && ClUseGlobalsGC),
explicit AddressSanitizerLegacyPass(bool CompileKernel = false,
bool Recover = false,
bool UseAfterScope = false)
: FunctionPass(ID), CompileKernel(CompileKernel), Recover(Recover),
UseAfterScope(UseAfterScope) {
initializeAddressSanitizerLegacyPassPass(*PassRegistry::getPassRegistry());
}
StringRef getPassName() const override {
return "AddressSanitizerFunctionPass";
}
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.addRequired<ASanGlobalsMetadataWrapperPass>();
AU.addRequired<TargetLibraryInfoWrapperPass>();
}
bool runOnFunction(Function &F) override {
GlobalsMetadata &GlobalsMD =
getAnalysis<ASanGlobalsMetadataWrapperPass>().getGlobalsMD();
const TargetLibraryInfo *TLI =
&getAnalysis<TargetLibraryInfoWrapperPass>().getTLI();
AddressSanitizer ASan(*F.getParent(), GlobalsMD, CompileKernel, Recover,
UseAfterScope);
return ASan.instrumentFunction(F, TLI);
}
private:
bool CompileKernel;
bool Recover;
bool UseAfterScope;
};
class ModuleAddressSanitizer {
public:
ModuleAddressSanitizer(Module &M, GlobalsMetadata &GlobalsMD,
bool CompileKernel = false, bool Recover = false,
bool UseGlobalsGC = true, bool UseOdrIndicator = false)
: GlobalsMD(GlobalsMD), UseGlobalsGC(UseGlobalsGC && ClUseGlobalsGC),
// Enable aliases as they should have no downside with ODR indicators.
UsePrivateAlias(UseOdrIndicator || ClUsePrivateAlias),
UseOdrIndicator(UseOdrIndicator || ClUseOdrIndicator),
@ -758,10 +732,15 @@ public:
this->Recover = ClRecover.getNumOccurrences() > 0 ? ClRecover : Recover;
this->CompileKernel =
ClEnableKasan.getNumOccurrences() > 0 ? ClEnableKasan : CompileKernel;
C = &(M.getContext());
int LongSize = M.getDataLayout().getPointerSizeInBits();
IntptrTy = Type::getIntNTy(*C, LongSize);
TargetTriple = Triple(M.getTargetTriple());
Mapping = getShadowMapping(TargetTriple, LongSize, this->CompileKernel);
}
bool runOnModule(Module &M) override;
StringRef getPassName() const override { return "AddressSanitizerModule"; }
bool instrumentModule(Module &);
private:
void initializeCallbacks(Module &M);
@ -822,6 +801,41 @@ private:
Function *AsanDtorFunction = nullptr;
};
class ModuleAddressSanitizerLegacyPass : public ModulePass {
public:
static char ID;
explicit ModuleAddressSanitizerLegacyPass(bool CompileKernel = false,
bool Recover = false,
bool UseGlobalGC = true,
bool UseOdrIndicator = false)
: ModulePass(ID), CompileKernel(CompileKernel), Recover(Recover),
UseGlobalGC(UseGlobalGC), UseOdrIndicator(UseOdrIndicator) {
initializeModuleAddressSanitizerLegacyPassPass(
*PassRegistry::getPassRegistry());
}
StringRef getPassName() const override { return "ModuleAddressSanitizer"; }
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.addRequired<ASanGlobalsMetadataWrapperPass>();
}
bool runOnModule(Module &M) override {
GlobalsMetadata &GlobalsMD =
getAnalysis<ASanGlobalsMetadataWrapperPass>().getGlobalsMD();
ModuleAddressSanitizer ASanModule(M, GlobalsMD, CompileKernel, Recover,
UseGlobalGC, UseOdrIndicator);
return ASanModule.instrumentModule(M);
}
private:
bool CompileKernel;
bool Recover;
bool UseGlobalGC;
bool UseOdrIndicator;
};
// Stack poisoning does not play well with exception handling.
// When an exception is thrown, we essentially bypass the code
// that unpoisones the stack. This is why the run-time library has
@ -875,13 +889,9 @@ struct FunctionStackPoisoner : public InstVisitor<FunctionStackPoisoner> {
std::unique_ptr<CallInst> EmptyInlineAsm;
FunctionStackPoisoner(Function &F, AddressSanitizer &ASan)
: F(F),
ASan(ASan),
DIB(*F.getParent(), /*AllowUnresolved*/ false),
C(ASan.C),
IntptrTy(ASan.IntptrTy),
IntptrPtrTy(PointerType::get(IntptrTy, 0)),
Mapping(ASan.Mapping),
: F(F), ASan(ASan), DIB(*F.getParent(), /*AllowUnresolved*/ false),
C(ASan.C), IntptrTy(ASan.IntptrTy),
IntptrPtrTy(PointerType::get(IntptrTy, 0)), Mapping(ASan.Mapping),
StackAlignment(1 << Mapping.Scale),
EmptyInlineAsm(CallInst::Create(ASan.EmptyAsm)) {}
@ -1042,13 +1052,6 @@ struct FunctionStackPoisoner : public InstVisitor<FunctionStackPoisoner> {
// ---------------------- Helpers.
void initializeCallbacks(Module &M);
bool doesDominateAllExits(const Instruction *I) const {
for (auto Ret : RetVec) {
if (!ASan.getDominatorTree().dominates(I, Ret)) return false;
}
return true;
}
/// Finds alloca where the value comes from.
AllocaInst *findAllocaForValue(Value *V);
@ -1074,16 +1077,111 @@ struct FunctionStackPoisoner : public InstVisitor<FunctionStackPoisoner> {
} // end anonymous namespace
char AddressSanitizer::ID = 0;
void LocationMetadata::parse(MDNode *MDN) {
assert(MDN->getNumOperands() == 3);
MDString *DIFilename = cast<MDString>(MDN->getOperand(0));
Filename = DIFilename->getString();
LineNo = mdconst::extract<ConstantInt>(MDN->getOperand(1))->getLimitedValue();
ColumnNo =
mdconst::extract<ConstantInt>(MDN->getOperand(2))->getLimitedValue();
}
// FIXME: It would be cleaner to instead attach relevant metadata to the globals
// we want to sanitize instead and reading this metadata on each pass over a
// function instead of reading module level metadata at first.
GlobalsMetadata::GlobalsMetadata(Module &M) {
NamedMDNode *Globals = M.getNamedMetadata("llvm.asan.globals");
if (!Globals)
return;
for (auto MDN : Globals->operands()) {
// Metadata node contains the global and the fields of "Entry".
assert(MDN->getNumOperands() == 5);
auto *V = mdconst::extract_or_null<Constant>(MDN->getOperand(0));
// The optimizer may optimize away a global entirely.
if (!V)
continue;
auto *StrippedV = V->stripPointerCasts();
auto *GV = dyn_cast<GlobalVariable>(StrippedV);
if (!GV)
continue;
// We can already have an entry for GV if it was merged with another
// global.
Entry &E = Entries[GV];
if (auto *Loc = cast_or_null<MDNode>(MDN->getOperand(1)))
E.SourceLoc.parse(Loc);
if (auto *Name = cast_or_null<MDString>(MDN->getOperand(2)))
E.Name = Name->getString();
ConstantInt *IsDynInit = mdconst::extract<ConstantInt>(MDN->getOperand(3));
E.IsDynInit |= IsDynInit->isOne();
ConstantInt *IsBlacklisted =
mdconst::extract<ConstantInt>(MDN->getOperand(4));
E.IsBlacklisted |= IsBlacklisted->isOne();
}
}
AnalysisKey ASanGlobalsMetadataAnalysis::Key;
GlobalsMetadata ASanGlobalsMetadataAnalysis::run(Module &M,
ModuleAnalysisManager &AM) {
return GlobalsMetadata(M);
}
AddressSanitizerPass::AddressSanitizerPass(bool CompileKernel, bool Recover,
bool UseAfterScope)
: CompileKernel(CompileKernel), Recover(Recover),
UseAfterScope(UseAfterScope) {}
PreservedAnalyses AddressSanitizerPass::run(Function &F,
AnalysisManager<Function> &AM) {
auto &MAMProxy = AM.getResult<ModuleAnalysisManagerFunctionProxy>(F);
auto &MAM = MAMProxy.getManager();
Module &M = *F.getParent();
if (auto *R = MAM.getCachedResult<ASanGlobalsMetadataAnalysis>(M)) {
const TargetLibraryInfo *TLI = &AM.getResult<TargetLibraryAnalysis>(F);
AddressSanitizer Sanitizer(M, *R, CompileKernel, Recover, UseAfterScope);
if (Sanitizer.instrumentFunction(F, TLI))
return PreservedAnalyses::none();
return PreservedAnalyses::all();
}
report_fatal_error(
"The ASanGlobalsMetadataAnalysis is required to run before "
"AddressSanitizer can run");
return PreservedAnalyses::all();
}
ModuleAddressSanitizerPass::ModuleAddressSanitizerPass(bool CompileKernel,
bool Recover,
bool UseGlobalGC,
bool UseOdrIndicator)
: CompileKernel(CompileKernel), Recover(Recover), UseGlobalGC(UseGlobalGC),
UseOdrIndicator(UseOdrIndicator) {}
PreservedAnalyses ModuleAddressSanitizerPass::run(Module &M,
AnalysisManager<Module> &AM) {
GlobalsMetadata &GlobalsMD = AM.getResult<ASanGlobalsMetadataAnalysis>(M);
ModuleAddressSanitizer Sanitizer(M, GlobalsMD, CompileKernel, Recover,
UseGlobalGC, UseOdrIndicator);
if (Sanitizer.instrumentModule(M))
return PreservedAnalyses::none();
return PreservedAnalyses::all();
}
INITIALIZE_PASS(ASanGlobalsMetadataWrapperPass, "asan-globals-md",
"Read metadata to mark which globals should be instrumented "
"when running ASan.",
false, true);
char AddressSanitizerLegacyPass::ID = 0;
INITIALIZE_PASS_BEGIN(
AddressSanitizer, "asan",
AddressSanitizerLegacyPass, "asan",
"AddressSanitizer: detects use-after-free and out-of-bounds bugs.", false,
false)
INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)
INITIALIZE_PASS_DEPENDENCY(ASanGlobalsMetadataWrapperPass)
INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass)
INITIALIZE_PASS_END(
AddressSanitizer, "asan",
AddressSanitizerLegacyPass, "asan",
"AddressSanitizer: detects use-after-free and out-of-bounds bugs.", false,
false)
@ -1091,24 +1189,22 @@ FunctionPass *llvm::createAddressSanitizerFunctionPass(bool CompileKernel,
bool Recover,
bool UseAfterScope) {
assert(!CompileKernel || Recover);
return new AddressSanitizer(CompileKernel, Recover, UseAfterScope);
return new AddressSanitizerLegacyPass(CompileKernel, Recover, UseAfterScope);
}
char AddressSanitizerModule::ID = 0;
char ModuleAddressSanitizerLegacyPass::ID = 0;
INITIALIZE_PASS(
AddressSanitizerModule, "asan-module",
ModuleAddressSanitizerLegacyPass, "asan-module",
"AddressSanitizer: detects use-after-free and out-of-bounds bugs."
"ModulePass",
false, false)
ModulePass *llvm::createAddressSanitizerModulePass(bool CompileKernel,
bool Recover,
bool UseGlobalsGC,
bool UseOdrIndicator) {
ModulePass *llvm::createModuleAddressSanitizerLegacyPassPass(
bool CompileKernel, bool Recover, bool UseGlobalsGC, bool UseOdrIndicator) {
assert(!CompileKernel || Recover);
return new AddressSanitizerModule(CompileKernel, Recover, UseGlobalsGC,
UseOdrIndicator);
return new ModuleAddressSanitizerLegacyPass(CompileKernel, Recover,
UseGlobalsGC, UseOdrIndicator);
}
static size_t TypeSizeToSizeIndex(uint32_t TypeSize) {
@ -1328,6 +1424,9 @@ bool AddressSanitizer::GlobalIsLinkerInitialized(GlobalVariable *G) {
// If a global variable does not have dynamic initialization we don't
// have to instrument it. However, if a global does not have initializer
// at all, we assume it has dynamic initializer (in other TU).
//
// FIXME: Metadata should be attched directly to the global directly instead
// of being added to llvm.asan.globals.
return G->hasInitializer() && !GlobalsMD.get(G).IsDynInit;
}
@ -1612,7 +1711,7 @@ void AddressSanitizer::instrumentUnusualSizeOrAlignment(
}
}
void AddressSanitizerModule::poisonOneInitializer(Function &GlobalInit,
void ModuleAddressSanitizer::poisonOneInitializer(Function &GlobalInit,
GlobalValue *ModuleName) {
// Set up the arguments to our poison/unpoison functions.
IRBuilder<> IRB(&GlobalInit.front(),
@ -1628,7 +1727,7 @@ void AddressSanitizerModule::poisonOneInitializer(Function &GlobalInit,
CallInst::Create(AsanUnpoisonGlobals, "", RI);
}
void AddressSanitizerModule::createInitializerPoisonCalls(
void ModuleAddressSanitizer::createInitializerPoisonCalls(
Module &M, GlobalValue *ModuleName) {
GlobalVariable *GV = M.getGlobalVariable("llvm.global_ctors");
if (!GV)
@ -1653,10 +1752,12 @@ void AddressSanitizerModule::createInitializerPoisonCalls(
}
}
bool AddressSanitizerModule::ShouldInstrumentGlobal(GlobalVariable *G) {
bool ModuleAddressSanitizer::ShouldInstrumentGlobal(GlobalVariable *G) {
Type *Ty = G->getValueType();
LLVM_DEBUG(dbgs() << "GLOBAL: " << *G << "\n");
// FIXME: Metadata should be attched directly to the global directly instead
// of being added to llvm.asan.globals.
if (GlobalsMD.get(G).IsBlacklisted) return false;
if (!Ty->isSized()) return false;
if (!G->hasInitializer()) return false;
@ -1768,7 +1869,7 @@ bool AddressSanitizerModule::ShouldInstrumentGlobal(GlobalVariable *G) {
// On Mach-O platforms, we emit global metadata in a separate section of the
// binary in order to allow the linker to properly dead strip. This is only
// supported on recent versions of ld64.
bool AddressSanitizerModule::ShouldUseMachOGlobalsSection() const {
bool ModuleAddressSanitizer::ShouldUseMachOGlobalsSection() const {
if (!TargetTriple.isOSBinFormatMachO())
return false;
@ -1782,7 +1883,7 @@ bool AddressSanitizerModule::ShouldUseMachOGlobalsSection() const {
return false;
}
StringRef AddressSanitizerModule::getGlobalMetadataSection() const {
StringRef ModuleAddressSanitizer::getGlobalMetadataSection() const {
switch (TargetTriple.getObjectFormat()) {
case Triple::COFF: return ".ASAN$GL";
case Triple::ELF: return "asan_globals";
@ -1792,7 +1893,7 @@ StringRef AddressSanitizerModule::getGlobalMetadataSection() const {
llvm_unreachable("unsupported object format");
}
void AddressSanitizerModule::initializeCallbacks(Module &M) {
void ModuleAddressSanitizer::initializeCallbacks(Module &M) {
IRBuilder<> IRB(*C);
// Declare our poisoning and unpoisoning functions.
@ -1824,7 +1925,7 @@ void AddressSanitizerModule::initializeCallbacks(Module &M) {
// Put the metadata and the instrumented global in the same group. This ensures
// that the metadata is discarded if the instrumented global is discarded.
void AddressSanitizerModule::SetComdatForGlobalMetadata(
void ModuleAddressSanitizer::SetComdatForGlobalMetadata(
GlobalVariable *G, GlobalVariable *Metadata, StringRef InternalSuffix) {
Module &M = *G->getParent();
Comdat *C = G->getComdat();
@ -1862,7 +1963,7 @@ void AddressSanitizerModule::SetComdatForGlobalMetadata(
// Create a separate metadata global and put it in the appropriate ASan
// global registration section.
GlobalVariable *
AddressSanitizerModule::CreateMetadataGlobal(Module &M, Constant *Initializer,
ModuleAddressSanitizer::CreateMetadataGlobal(Module &M, Constant *Initializer,
StringRef OriginalName) {
auto Linkage = TargetTriple.isOSBinFormatMachO()
? GlobalVariable::InternalLinkage
@ -1874,7 +1975,7 @@ AddressSanitizerModule::CreateMetadataGlobal(Module &M, Constant *Initializer,
return Metadata;
}
IRBuilder<> AddressSanitizerModule::CreateAsanModuleDtor(Module &M) {
IRBuilder<> ModuleAddressSanitizer::CreateAsanModuleDtor(Module &M) {
AsanDtorFunction =
Function::Create(FunctionType::get(Type::getVoidTy(*C), false),
GlobalValue::InternalLinkage, kAsanModuleDtorName, &M);
@ -1883,7 +1984,7 @@ IRBuilder<> AddressSanitizerModule::CreateAsanModuleDtor(Module &M) {
return IRBuilder<>(ReturnInst::Create(*C, AsanDtorBB));
}
void AddressSanitizerModule::InstrumentGlobalsCOFF(
void ModuleAddressSanitizer::InstrumentGlobalsCOFF(
IRBuilder<> &IRB, Module &M, ArrayRef<GlobalVariable *> ExtendedGlobals,
ArrayRef<Constant *> MetadataInitializers) {
assert(ExtendedGlobals.size() == MetadataInitializers.size());
@ -1907,7 +2008,7 @@ void AddressSanitizerModule::InstrumentGlobalsCOFF(
}
}
void AddressSanitizerModule::InstrumentGlobalsELF(
void ModuleAddressSanitizer::InstrumentGlobalsELF(
IRBuilder<> &IRB, Module &M, ArrayRef<GlobalVariable *> ExtendedGlobals,
ArrayRef<Constant *> MetadataInitializers,
const std::string &UniqueModuleId) {
@ -1966,7 +2067,7 @@ void AddressSanitizerModule::InstrumentGlobalsELF(
IRB.CreatePointerCast(StopELFMetadata, IntptrTy)});
}
void AddressSanitizerModule::InstrumentGlobalsMachO(
void ModuleAddressSanitizer::InstrumentGlobalsMachO(
IRBuilder<> &IRB, Module &M, ArrayRef<GlobalVariable *> ExtendedGlobals,
ArrayRef<Constant *> MetadataInitializers) {
assert(ExtendedGlobals.size() == MetadataInitializers.size());
@ -2023,7 +2124,7 @@ void AddressSanitizerModule::InstrumentGlobalsMachO(
{IRB.CreatePointerCast(RegisteredFlag, IntptrTy)});
}
void AddressSanitizerModule::InstrumentGlobalsWithMetadataArray(
void ModuleAddressSanitizer::InstrumentGlobalsWithMetadataArray(
IRBuilder<> &IRB, Module &M, ArrayRef<GlobalVariable *> ExtendedGlobals,
ArrayRef<Constant *> MetadataInitializers) {
assert(ExtendedGlobals.size() == MetadataInitializers.size());
@ -2057,9 +2158,9 @@ void AddressSanitizerModule::InstrumentGlobalsWithMetadataArray(
// redzones and inserts this function into llvm.global_ctors.
// Sets *CtorComdat to true if the global registration code emitted into the
// asan constructor is comdat-compatible.
bool AddressSanitizerModule::InstrumentGlobals(IRBuilder<> &IRB, Module &M, bool *CtorComdat) {
bool ModuleAddressSanitizer::InstrumentGlobals(IRBuilder<> &IRB, Module &M,
bool *CtorComdat) {
*CtorComdat = false;
GlobalsMD.init(M);
SmallVector<GlobalVariable *, 16> GlobalsToChange;
@ -2102,6 +2203,8 @@ bool AddressSanitizerModule::InstrumentGlobals(IRBuilder<> &IRB, Module &M, bool
static const uint64_t kMaxGlobalRedzone = 1 << 18;
GlobalVariable *G = GlobalsToChange[i];
// FIXME: Metadata should be attched directly to the global directly instead
// of being added to llvm.asan.globals.
auto MD = GlobalsMD.get(G);
StringRef NameForGlobal = G->getName();
// Create string holding the global name (use global name from metadata
@ -2258,7 +2361,7 @@ bool AddressSanitizerModule::InstrumentGlobals(IRBuilder<> &IRB, Module &M, bool
return true;
}
int AddressSanitizerModule::GetAsanVersion(const Module &M) const {
int ModuleAddressSanitizer::GetAsanVersion(const Module &M) const {
int LongSize = M.getDataLayout().getPointerSizeInBits();
bool isAndroid = Triple(M.getTargetTriple()).isAndroid();
int Version = 8;
@ -2268,12 +2371,7 @@ int AddressSanitizerModule::GetAsanVersion(const Module &M) const {
return Version;
}
bool AddressSanitizerModule::runOnModule(Module &M) {
C = &(M.getContext());
int LongSize = M.getDataLayout().getPointerSizeInBits();
IntptrTy = Type::getIntNTy(*C, LongSize);
TargetTriple = Triple(M.getTargetTriple());
Mapping = getShadowMapping(TargetTriple, LongSize, CompileKernel);
bool ModuleAddressSanitizer::instrumentModule(Module &M) {
initializeCallbacks(M);
if (CompileKernel)
@ -2385,25 +2483,6 @@ void AddressSanitizer::initializeCallbacks(Module &M) {
ArrayType::get(IRB.getInt8Ty(), 0));
}
// virtual
bool AddressSanitizer::doInitialization(Module &M) {
// Initialize the private fields. No one has accessed them before.
GlobalsMD.init(M);
C = &(M.getContext());
LongSize = M.getDataLayout().getPointerSizeInBits();
IntptrTy = Type::getIntNTy(*C, LongSize);
TargetTriple = Triple(M.getTargetTriple());
Mapping = getShadowMapping(TargetTriple, LongSize, CompileKernel);
return true;
}
bool AddressSanitizer::doFinalization(Module &M) {
GlobalsMD.reset();
return false;
}
bool AddressSanitizer::maybeInsertAsanInitAtFunctionEntry(Function &F) {
// For each NSObject descendant having a +load method, this method is invoked
// by the ObjC runtime before any of the static constructors is called.
@ -2477,7 +2556,8 @@ void AddressSanitizer::markEscapedLocalAllocas(Function &F) {
}
}
bool AddressSanitizer::runOnFunction(Function &F) {
bool AddressSanitizer::instrumentFunction(Function &F,
const TargetLibraryInfo *TLI) {
if (F.getLinkage() == GlobalValue::AvailableExternallyLinkage) return false;
if (!ClDebugFunc.empty() && ClDebugFunc == F.getName()) return false;
if (F.getName().startswith("__asan_")) return false;
@ -2496,7 +2576,6 @@ bool AddressSanitizer::runOnFunction(Function &F) {
LLVM_DEBUG(dbgs() << "ASAN instrumenting:\n" << F << "\n");
initializeCallbacks(*F.getParent());
DT = &getAnalysis<DominatorTreeWrapperPass>().getDomTree();
FunctionStateRAII CleanupObj(this);
@ -2517,8 +2596,6 @@ bool AddressSanitizer::runOnFunction(Function &F) {
bool IsWrite;
unsigned Alignment;
uint64_t TypeSize;
const TargetLibraryInfo *TLI =
&getAnalysis<TargetLibraryInfoWrapperPass>().getTLI();
// Fill the set of memory operations to instrument.
for (auto &BB : F) {

4
lib/Transforms/Instrumentation/Instrumentation.cpp
View File

@ -100,8 +100,8 @@ Comdat *llvm::GetOrCreateFunctionComdat(Function &F, Triple &T,
/// initializeInstrumentation - Initialize all passes in the TransformUtils
/// library.
void llvm::initializeInstrumentation(PassRegistry &Registry) {
initializeAddressSanitizerPass(Registry);
initializeAddressSanitizerModulePass(Registry);
initializeAddressSanitizerLegacyPassPass(Registry);
initializeModuleAddressSanitizerLegacyPassPass(Registry);
initializeBoundsCheckingLegacyPassPass(Registry);
initializeControlHeightReductionLegacyPassPass(Registry);
initializeGCOVProfilerLegacyPassPass(Registry);

4
test/Instrumentation/AddressSanitizer/basic.ll
View File

@ -3,6 +3,10 @@
; RUN: opt < %s -asan -asan-module -S | FileCheck --check-prefixes=CHECK,CHECK-S3 %s
; RUN: opt < %s -asan -asan-module -asan-mapping-scale=5 -S | FileCheck --check-prefixes=CHECK,CHECK-S5 %s
; We need the requires since both asan and asan-module require reading module level metadata which is done once by the asan-globals-md analysis
; RUN: opt < %s -passes='require<asan-globals-md>,function(asan),module(asan-module)' -S | FileCheck --check-prefixes=CHECK,CHECK-S3 %s
; RUN: opt < %s -passes='require<asan-globals-md>,function(asan),module(asan-module)' -asan-mapping-scale=5 -S | FileCheck --check-prefixes=CHECK,CHECK-S5 %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
target triple = "x86_64-unknown-linux-gnu"
; CHECK: @llvm.global_ctors = {{.*}}@asan.module_ctor