#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/DepthFirstIterator.h"
#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/Triple.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/IR/Dominators.h"
+#include "llvm/IR/DebugInfo.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/InlineAsm.h"
#include "llvm/IR/InstVisitor.h"
cl::desc("respect alignment requirements provided by input IR"), cl::Hidden,
cl::init(false));
-// The ABI list file controls how shadow parameters are passed. The pass treats
+// The ABI list files control how shadow parameters are passed. The pass treats
// every function labelled "uninstrumented" in the ABI list file as conforming
// to the "native" (i.e. unsanitized) ABI. Unless the ABI list contains
// additional annotations for those functions, a call to one of those functions
// will produce a warning message, as the labelling behaviour of the function is
// unknown. The other supported annotations are "functional" and "discard",
// which are described below under DataFlowSanitizer::WrapperKind.
-static cl::opt<std::string> ClABIListFile(
+static cl::list<std::string> ClABIListFiles(
"dfsan-abilist",
cl::desc("File listing native ABI functions and how the pass treats them"),
cl::Hidden);
std::unique_ptr<SpecialCaseList> SCL;
public:
- DFSanABIList(SpecialCaseList *SCL) : SCL(SCL) {}
+ DFSanABIList() {}
+
+ void set(std::unique_ptr<SpecialCaseList> List) { SCL = std::move(List); }
/// Returns whether either this function or its source file are listed in the
/// given category.
- bool isIn(const Function &F, const StringRef Category) const {
+ bool isIn(const Function &F, StringRef Category) const {
return isIn(*F.getParent(), Category) ||
SCL->inSection("fun", F.getName(), Category);
}
///
/// If GA aliases a function, the alias's name is matched as a function name
/// would be. Similarly, aliases of globals are matched like globals.
- bool isIn(const GlobalAlias &GA, const StringRef Category) const {
+ bool isIn(const GlobalAlias &GA, StringRef Category) const {
if (isIn(*GA.getParent(), Category))
return true;
}
/// Returns whether this module is listed in the given category.
- bool isIn(const Module &M, const StringRef Category) const {
+ bool isIn(const Module &M, StringRef Category) const {
return SCL->inSection("src", M.getModuleIdentifier(), Category);
}
};
FunctionType *DFSanUnimplementedFnTy;
FunctionType *DFSanSetLabelFnTy;
FunctionType *DFSanNonzeroLabelFnTy;
+ FunctionType *DFSanVarargWrapperFnTy;
Constant *DFSanUnionFn;
Constant *DFSanCheckedUnionFn;
Constant *DFSanUnionLoadFn;
Constant *DFSanUnimplementedFn;
Constant *DFSanSetLabelFn;
Constant *DFSanNonzeroLabelFn;
+ Constant *DFSanVarargWrapperFn;
MDNode *ColdCallWeights;
DFSanABIList ABIList;
DenseMap<Value *, Function *> UnwrappedFnMap;
AttributeSet ReadOnlyNoneAttrs;
+ DenseMap<const Function *, DISubprogram> FunctionDIs;
Value *getShadowAddress(Value *Addr, Instruction *Pos);
bool isInstrumented(const Function *F);
Constant *getOrBuildTrampolineFunction(FunctionType *FT, StringRef FName);
public:
- DataFlowSanitizer(StringRef ABIListFile = StringRef(),
- void *(*getArgTLS)() = nullptr,
- void *(*getRetValTLS)() = nullptr);
+ DataFlowSanitizer(
+ const std::vector<std::string> &ABIListFiles = std::vector<std::string>(),
+ void *(*getArgTLS)() = nullptr, void *(*getRetValTLS)() = nullptr);
static char ID;
bool doInitialization(Module &M) override;
bool runOnModule(Module &M) override;
INITIALIZE_PASS(DataFlowSanitizer, "dfsan",
"DataFlowSanitizer: dynamic data flow analysis.", false, false)
-ModulePass *llvm::createDataFlowSanitizerPass(StringRef ABIListFile,
- void *(*getArgTLS)(),
- void *(*getRetValTLS)()) {
- return new DataFlowSanitizer(ABIListFile, getArgTLS, getRetValTLS);
+ModulePass *
+llvm::createDataFlowSanitizerPass(const std::vector<std::string> &ABIListFiles,
+ void *(*getArgTLS)(),
+ void *(*getRetValTLS)()) {
+ return new DataFlowSanitizer(ABIListFiles, getArgTLS, getRetValTLS);
}
-DataFlowSanitizer::DataFlowSanitizer(StringRef ABIListFile,
- void *(*getArgTLS)(),
- void *(*getRetValTLS)())
- : ModulePass(ID), GetArgTLSPtr(getArgTLS), GetRetvalTLSPtr(getRetValTLS),
- ABIList(SpecialCaseList::createOrDie(ABIListFile.empty() ? ClABIListFile
- : ABIListFile)) {
+DataFlowSanitizer::DataFlowSanitizer(
+ const std::vector<std::string> &ABIListFiles, void *(*getArgTLS)(),
+ void *(*getRetValTLS)())
+ : ModulePass(ID), GetArgTLSPtr(getArgTLS), GetRetvalTLSPtr(getRetValTLS) {
+ std::vector<std::string> AllABIListFiles(std::move(ABIListFiles));
+ AllABIListFiles.insert(AllABIListFiles.end(), ClABIListFiles.begin(),
+ ClABIListFiles.end());
+ ABIList.set(SpecialCaseList::createOrDie(AllABIListFiles));
}
FunctionType *DataFlowSanitizer::getArgsFunctionType(FunctionType *T) {
}
FunctionType *DataFlowSanitizer::getCustomFunctionType(FunctionType *T) {
- assert(!T->isVarArg());
llvm::SmallVector<Type *, 4> ArgTypes;
for (FunctionType::param_iterator i = T->param_begin(), e = T->param_end();
i != e; ++i) {
}
for (unsigned i = 0, e = T->getNumParams(); i != e; ++i)
ArgTypes.push_back(ShadowTy);
+ if (T->isVarArg())
+ ArgTypes.push_back(ShadowPtrTy);
Type *RetType = T->getReturnType();
if (!RetType->isVoidTy())
ArgTypes.push_back(ShadowPtrTy);
- return FunctionType::get(T->getReturnType(), ArgTypes, false);
+ return FunctionType::get(T->getReturnType(), ArgTypes, T->isVarArg());
}
bool DataFlowSanitizer::doInitialization(Module &M) {
+ llvm::Triple TargetTriple(M.getTargetTriple());
+ bool IsX86_64 = TargetTriple.getArch() == llvm::Triple::x86_64;
+ bool IsMIPS64 = TargetTriple.getArch() == llvm::Triple::mips64 ||
+ TargetTriple.getArch() == llvm::Triple::mips64el;
+
DataLayoutPass *DLP = getAnalysisIfAvailable<DataLayoutPass>();
if (!DLP)
report_fatal_error("data layout missing");
ShadowPtrTy = PointerType::getUnqual(ShadowTy);
IntptrTy = DL->getIntPtrType(*Ctx);
ZeroShadow = ConstantInt::getSigned(ShadowTy, 0);
- ShadowPtrMask = ConstantInt::getSigned(IntptrTy, ~0x700000000000LL);
ShadowPtrMul = ConstantInt::getSigned(IntptrTy, ShadowWidth / 8);
+ if (IsX86_64)
+ ShadowPtrMask = ConstantInt::getSigned(IntptrTy, ~0x700000000000LL);
+ else if (IsMIPS64)
+ ShadowPtrMask = ConstantInt::getSigned(IntptrTy, ~0xF000000000LL);
+ else
+ report_fatal_error("unsupported triple");
Type *DFSanUnionArgs[2] = { ShadowTy, ShadowTy };
DFSanUnionFnTy =
DFSanSetLabelFnTy = FunctionType::get(Type::getVoidTy(*Ctx),
DFSanSetLabelArgs, /*isVarArg=*/false);
DFSanNonzeroLabelFnTy = FunctionType::get(
- Type::getVoidTy(*Ctx), ArrayRef<Type *>(), /*isVarArg=*/false);
+ Type::getVoidTy(*Ctx), None, /*isVarArg=*/false);
+ DFSanVarargWrapperFnTy = FunctionType::get(
+ Type::getVoidTy(*Ctx), Type::getInt8PtrTy(*Ctx), /*isVarArg=*/false);
if (GetArgTLSPtr) {
Type *ArgTLSTy = ArrayType::get(ShadowTy, 64);
return WK_Functional;
if (ABIList.isIn(*F, "discard"))
return WK_Discard;
- if (ABIList.isIn(*F, "custom") && !F->isVarArg())
+ if (ABIList.isIn(*F, "custom"))
return WK_Custom;
return WK_Warning;
AttributeSet::ReturnIndex));
BasicBlock *BB = BasicBlock::Create(*Ctx, "entry", NewF);
- std::vector<Value *> Args;
- unsigned n = FT->getNumParams();
- for (Function::arg_iterator ai = NewF->arg_begin(); n != 0; ++ai, --n)
- Args.push_back(&*ai);
- CallInst *CI = CallInst::Create(F, Args, "", BB);
- if (FT->getReturnType()->isVoidTy())
- ReturnInst::Create(*Ctx, BB);
- else
- ReturnInst::Create(*Ctx, CI, BB);
+ if (F->isVarArg()) {
+ NewF->removeAttributes(
+ AttributeSet::FunctionIndex,
+ AttributeSet().addAttribute(*Ctx, AttributeSet::FunctionIndex,
+ "split-stack"));
+ CallInst::Create(DFSanVarargWrapperFn,
+ IRBuilder<>(BB).CreateGlobalStringPtr(F->getName()), "",
+ BB);
+ new UnreachableInst(*Ctx, BB);
+ } else {
+ std::vector<Value *> Args;
+ unsigned n = FT->getNumParams();
+ for (Function::arg_iterator ai = NewF->arg_begin(); n != 0; ++ai, --n)
+ Args.push_back(&*ai);
+ CallInst *CI = CallInst::Create(F, Args, "", BB);
+ if (FT->getReturnType()->isVoidTy())
+ ReturnInst::Create(*Ctx, BB);
+ else
+ ReturnInst::Create(*Ctx, CI, BB);
+ }
return NewF;
}
if (ABIList.isIn(M, "skip"))
return false;
+ FunctionDIs = makeSubprogramMap(M);
+
if (!GetArgTLSPtr) {
Type *ArgTLSTy = ArrayType::get(ShadowTy, 64);
ArgTLS = Mod->getOrInsertGlobal("__dfsan_arg_tls", ArgTLSTy);
}
DFSanNonzeroLabelFn =
Mod->getOrInsertFunction("__dfsan_nonzero_label", DFSanNonzeroLabelFnTy);
+ DFSanVarargWrapperFn = Mod->getOrInsertFunction("__dfsan_vararg_wrapper",
+ DFSanVarargWrapperFnTy);
std::vector<Function *> FnsToInstrument;
llvm::SmallPtrSet<Function *, 2> FnsWithNativeABI;
i != DFSanUnionLoadFn &&
i != DFSanUnimplementedFn &&
i != DFSanSetLabelFn &&
- i != DFSanNonzeroLabelFn)
+ i != DFSanNonzeroLabelFn &&
+ i != DFSanVarargWrapperFn)
FnsToInstrument.push_back(&*i);
}
} else {
addGlobalNamePrefix(&F);
}
- // Hopefully, nobody will try to indirectly call a vararg
- // function... yet.
- } else if (FT->isVarArg()) {
- UnwrappedFnMap[&F] = &F;
- *i = nullptr;
} else if (!IsZeroArgsVoidRet || getWrapperKind(&F) == WK_Custom) {
// Build a wrapper function for F. The wrapper simply calls F, and is
// added to FnsToInstrument so that any instrumentation according to its
Value *WrappedFnCst =
ConstantExpr::getBitCast(NewF, PointerType::getUnqual(FT));
F.replaceAllUsesWith(WrappedFnCst);
+
+ // Patch the pointer to LLVM function in debug info descriptor.
+ auto DI = FunctionDIs.find(&F);
+ if (DI != FunctionDIs.end())
+ DI->second.replaceFunction(&F);
+
UnwrappedFnMap[WrappedFnCst] = &F;
*i = NewF;
i = FnsToInstrument.begin() + N;
e = FnsToInstrument.begin() + Count;
}
+ // Hopefully, nobody will try to indirectly call a vararg
+ // function... yet.
+ } else if (FT->isVarArg()) {
+ UnwrappedFnMap[&F] = &F;
+ *i = nullptr;
}
}
return;
}
+ // Calls to this function are synthesized in wrappers, and we shouldn't
+ // instrument them.
+ if (F == DFSF.DFS.DFSanVarargWrapperFn)
+ return;
+
+ assert(!(cast<FunctionType>(
+ CS.getCalledValue()->getType()->getPointerElementType())->isVarArg() &&
+ dyn_cast<InvokeInst>(CS.getInstruction())));
+
IRBuilder<> IRB(CS.getInstruction());
DenseMap<Value *, Function *>::iterator i =
for (unsigned n = FT->getNumParams(); n != 0; ++i, --n)
Args.push_back(DFSF.getShadow(*i));
+ if (FT->isVarArg()) {
+ auto LabelVAAlloca =
+ new AllocaInst(ArrayType::get(DFSF.DFS.ShadowTy,
+ CS.arg_size() - FT->getNumParams()),
+ "labelva", DFSF.F->getEntryBlock().begin());
+
+ for (unsigned n = 0; i != CS.arg_end(); ++i, ++n) {
+ auto LabelVAPtr = IRB.CreateStructGEP(LabelVAAlloca, n);
+ IRB.CreateStore(DFSF.getShadow(*i), LabelVAPtr);
+ }
+
+ Args.push_back(IRB.CreateStructGEP(LabelVAAlloca, 0));
+ }
+
if (!FT->getReturnType()->isVoidTy()) {
if (!DFSF.LabelReturnAlloca) {
DFSF.LabelReturnAlloca =
Args.push_back(DFSF.LabelReturnAlloca);
}
+ for (i = CS.arg_begin() + FT->getNumParams(); i != CS.arg_end(); ++i)
+ Args.push_back(*i);
+
CallInst *CustomCI = IRB.CreateCall(CustomF, Args);
CustomCI->setCallingConv(CI->getCallingConv());
CustomCI->setAttributes(CI->getAttributes());
Next = II->getNormalDest()->begin();
} else {
BasicBlock *NewBB =
- SplitEdge(II->getParent(), II->getNormalDest(), &DFSF.DFS);
+ SplitEdge(II->getParent(), II->getNormalDest(), &DFSF.DT);
Next = NewBB->begin();
}
} else {
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