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-rw-r--r--llvm/tools/llvm-cfi-verify/llvm-cfi-verify.cpp241
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diff --git a/llvm/tools/llvm-cfi-verify/llvm-cfi-verify.cpp b/llvm/tools/llvm-cfi-verify/llvm-cfi-verify.cpp
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--- a/llvm/tools/llvm-cfi-verify/llvm-cfi-verify.cpp
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-//===-- llvm-cfi-verify.cpp - CFI Verification tool for LLVM --------------===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This tool verifies Control Flow Integrity (CFI) instrumentation by static
-// binary anaylsis. See the design document in /docs/CFIVerify.rst for more
-// information.
-//
-// This tool is currently incomplete. It currently only does disassembly for
-// object files, and searches through the code for indirect control flow
-// instructions, printing them once found.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/MC/MCAsmInfo.h"
-#include "llvm/MC/MCContext.h"
-#include "llvm/MC/MCDisassembler/MCDisassembler.h"
-#include "llvm/MC/MCInst.h"
-#include "llvm/MC/MCInstPrinter.h"
-#include "llvm/MC/MCInstrAnalysis.h"
-#include "llvm/MC/MCInstrDesc.h"
-#include "llvm/MC/MCInstrInfo.h"
-#include "llvm/MC/MCObjectFileInfo.h"
-#include "llvm/MC/MCRegisterInfo.h"
-#include "llvm/MC/MCSubtargetInfo.h"
-#include "llvm/Object/Binary.h"
-#include "llvm/Object/COFF.h"
-#include "llvm/Object/ObjectFile.h"
-#include "llvm/Support/Casting.h"
-#include "llvm/Support/CommandLine.h"
-#include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Support/TargetRegistry.h"
-#include "llvm/Support/TargetSelect.h"
-#include "llvm/Support/raw_ostream.h"
-
-#include <cassert>
-#include <cstdlib>
-
-using namespace llvm;
-using namespace llvm::object;
-
-cl::opt<bool> ArgDumpSymbols("sym", cl::desc("Dump the symbol table."));
-cl::opt<std::string> InputFilename(cl::Positional, cl::desc("<input file>"),
- cl::Required);
-
-static void printSymbols(const ObjectFile *Object) {
- for (const SymbolRef &Symbol : Object->symbols()) {
- outs() << "Symbol [" << format_hex_no_prefix(Symbol.getValue(), 2)
- << "] = ";
-
- auto SymbolName = Symbol.getName();
- if (SymbolName)
- outs() << *SymbolName;
- else
- outs() << "UNKNOWN";
-
- if (Symbol.getFlags() & SymbolRef::SF_Hidden)
- outs() << " .hidden";
-
- outs() << " (Section = ";
-
- auto SymbolSection = Symbol.getSection();
- if (SymbolSection) {
- StringRef SymbolSectionName;
- if ((*SymbolSection)->getName(SymbolSectionName))
- outs() << "UNKNOWN)";
- else
- outs() << SymbolSectionName << ")";
- } else {
- outs() << "N/A)";
- }
-
- outs() << "\n";
- }
-}
-
-int main(int argc, char **argv) {
- cl::ParseCommandLineOptions(argc, argv);
-
- InitializeAllTargetInfos();
- InitializeAllTargetMCs();
- InitializeAllAsmParsers();
- InitializeAllDisassemblers();
-
- Expected<OwningBinary<Binary>> BinaryOrErr = createBinary(InputFilename);
- if (!BinaryOrErr) {
- errs() << "Failed to open file.\n";
- return EXIT_FAILURE;
- }
-
- Binary &Binary = *BinaryOrErr.get().getBinary();
- ObjectFile *Object = dyn_cast<ObjectFile>(&Binary);
- if (!Object) {
- errs() << "Disassembling of non-objects not currently supported.\n";
- return EXIT_FAILURE;
- }
-
- Triple TheTriple = Object->makeTriple();
- std::string TripleName = TheTriple.getTriple();
- std::string ArchName = "";
- std::string ErrorString;
-
- const Target *TheTarget =
- TargetRegistry::lookupTarget(ArchName, TheTriple, ErrorString);
-
- if (!TheTarget) {
- errs() << "Couldn't find target \"" << TheTriple.getTriple()
- << "\", failed with error: " << ErrorString << ".\n";
- return EXIT_FAILURE;
- }
-
- SubtargetFeatures Features = Object->getFeatures();
-
- std::unique_ptr<const MCRegisterInfo> RegisterInfo(
- TheTarget->createMCRegInfo(TripleName));
- if (!RegisterInfo) {
- errs() << "Failed to initialise RegisterInfo.\n";
- return EXIT_FAILURE;
- }
-
- std::unique_ptr<const MCAsmInfo> AsmInfo(
- TheTarget->createMCAsmInfo(*RegisterInfo, TripleName));
- if (!AsmInfo) {
- errs() << "Failed to initialise AsmInfo.\n";
- return EXIT_FAILURE;
- }
-
- std::string MCPU = "";
- std::unique_ptr<MCSubtargetInfo> SubtargetInfo(
- TheTarget->createMCSubtargetInfo(TripleName, MCPU, Features.getString()));
- if (!SubtargetInfo) {
- errs() << "Failed to initialise SubtargetInfo.\n";
- return EXIT_FAILURE;
- }
-
- std::unique_ptr<const MCInstrInfo> MII(TheTarget->createMCInstrInfo());
- if (!MII) {
- errs() << "Failed to initialise MII.\n";
- return EXIT_FAILURE;
- }
-
- MCObjectFileInfo MOFI;
- MCContext Context(AsmInfo.get(), RegisterInfo.get(), &MOFI);
-
- std::unique_ptr<const MCDisassembler> Disassembler(
- TheTarget->createMCDisassembler(*SubtargetInfo, Context));
-
- if (!Disassembler) {
- errs() << "No disassembler available for target.";
- return EXIT_FAILURE;
- }
-
- std::unique_ptr<const MCInstrAnalysis> MIA(
- TheTarget->createMCInstrAnalysis(MII.get()));
-
- std::unique_ptr<MCInstPrinter> Printer(
- TheTarget->createMCInstPrinter(TheTriple, AsmInfo->getAssemblerDialect(),
- *AsmInfo, *MII, *RegisterInfo));
-
- if (ArgDumpSymbols)
- printSymbols(Object);
-
- for (const SectionRef &Section : Object->sections()) {
- outs() << "Section [" << format_hex_no_prefix(Section.getAddress(), 2)
- << "] = ";
- StringRef SectionName;
-
- if (Section.getName(SectionName))
- outs() << "UNKNOWN.\n";
- else
- outs() << SectionName << "\n";
-
- StringRef SectionContents;
- if (Section.getContents(SectionContents)) {
- errs() << "Failed to retrieve section contents.\n";
- return EXIT_FAILURE;
- }
-
- MCInst Instruction;
- size_t InstructionSize;
-
- ArrayRef<uint8_t> SectionBytes((const uint8_t *)SectionContents.data(),
- Section.getSize());
-
- for (size_t Byte = 0; Byte < Section.getSize();) {
- bool BadInstruction = false;
-
- // Disassemble the instruction.
- if (Disassembler->getInstruction(
- Instruction, InstructionSize, SectionBytes.drop_front(Byte), 0,
- nulls(), outs()) != MCDisassembler::Success) {
- BadInstruction = true;
- }
-
- Byte += InstructionSize;
-
- if (BadInstruction)
- continue;
-
- // Skip instructions that do not affect the control flow.
- const auto &InstrDesc = MII->get(Instruction.getOpcode());
- if (!InstrDesc.mayAffectControlFlow(Instruction, *RegisterInfo))
- continue;
-
- // Skip instructions that do not operate on register operands.
- bool UsesRegisterOperand = false;
- for (const auto &Operand : Instruction) {
- if (Operand.isReg())
- UsesRegisterOperand = true;
- }
-
- if (!UsesRegisterOperand)
- continue;
-
- // Print the instruction address.
- outs() << " "
- << format_hex(Section.getAddress() + Byte - InstructionSize, 2)
- << ": ";
-
- // Print the instruction bytes.
- for (size_t i = 0; i < InstructionSize; ++i) {
- outs() << format_hex_no_prefix(SectionBytes[Byte - InstructionSize + i],
- 2)
- << " ";
- }
-
- // Print the instruction.
- outs() << " | " << MII->getName(Instruction.getOpcode()) << " ";
- Instruction.dump_pretty(outs(), Printer.get());
-
- outs() << "\n";
- }
- }
-
- return EXIT_SUCCESS;
-}
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