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283 lines
10 KiB
C++
283 lines
10 KiB
C++
//===-- llvm-cfi-verify.cpp - CFI Verification tool for LLVM --------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This tool verifies Control Flow Integrity (CFI) instrumentation by static
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// binary anaylsis. See the design document in /docs/CFIVerify.rst for more
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// information.
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//
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// This tool is currently incomplete. It currently only does disassembly for
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// object files, and searches through the code for indirect control flow
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// instructions, printing them once found.
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//
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//===----------------------------------------------------------------------===//
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#include "lib/FileAnalysis.h"
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#include "lib/GraphBuilder.h"
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#include "llvm/BinaryFormat/ELF.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Error.h"
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#include "llvm/Support/FormatVariadic.h"
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#include "llvm/Support/SpecialCaseList.h"
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#include "llvm/Support/VirtualFileSystem.h"
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#include <cstdlib>
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using namespace llvm;
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using namespace llvm::object;
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using namespace llvm::cfi_verify;
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static cl::OptionCategory CFIVerifyCategory("CFI Verify Options");
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cl::opt<std::string> InputFilename(cl::Positional, cl::desc("<input file>"),
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cl::Required, cl::cat(CFIVerifyCategory));
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cl::opt<std::string> BlacklistFilename(cl::Positional,
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cl::desc("[blacklist file]"),
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cl::init("-"),
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cl::cat(CFIVerifyCategory));
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cl::opt<bool> PrintGraphs(
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"print-graphs",
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cl::desc("Print graphs around indirect CF instructions in DOT format."),
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cl::init(false), cl::cat(CFIVerifyCategory));
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cl::opt<unsigned> PrintBlameContext(
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"blame-context",
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cl::desc("Print the blame context (if possible) for BAD instructions. This "
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"specifies the number of lines of context to include, where zero "
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"disables this feature."),
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cl::init(0), cl::cat(CFIVerifyCategory));
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cl::opt<unsigned> PrintBlameContextAll(
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"blame-context-all",
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cl::desc("Prints the blame context (if possible) for ALL instructions. "
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"This specifies the number of lines of context for non-BAD "
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"instructions (see --blame-context). If --blame-context is "
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"unspecified, it prints this number of contextual lines for BAD "
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"instructions as well."),
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cl::init(0), cl::cat(CFIVerifyCategory));
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cl::opt<bool> Summarize("summarize", cl::desc("Print the summary only."),
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cl::init(false), cl::cat(CFIVerifyCategory));
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ExitOnError ExitOnErr;
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static void printBlameContext(const DILineInfo &LineInfo, unsigned Context) {
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auto FileOrErr = MemoryBuffer::getFile(LineInfo.FileName);
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if (!FileOrErr) {
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errs() << "Could not open file: " << LineInfo.FileName << "\n";
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return;
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}
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std::unique_ptr<MemoryBuffer> File = std::move(FileOrErr.get());
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SmallVector<StringRef, 100> Lines;
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File->getBuffer().split(Lines, '\n');
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for (unsigned i = std::max<size_t>(1, LineInfo.Line - Context);
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i <
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std::min<size_t>(Lines.size() + 1, LineInfo.Line + Context + 1);
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++i) {
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if (i == LineInfo.Line)
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outs() << ">";
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else
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outs() << " ";
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outs() << i << ": " << Lines[i - 1] << "\n";
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}
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}
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static void printInstructionInformation(const FileAnalysis &Analysis,
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const Instr &InstrMeta,
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const GraphResult &Graph,
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CFIProtectionStatus ProtectionStatus) {
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outs() << "Instruction: " << format_hex(InstrMeta.VMAddress, 2) << " ("
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<< stringCFIProtectionStatus(ProtectionStatus) << "): ";
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Analysis.printInstruction(InstrMeta, outs());
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outs() << " \n";
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if (PrintGraphs)
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Graph.printToDOT(Analysis, outs());
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}
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static void printInstructionStatus(unsigned BlameLine, bool CFIProtected,
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const DILineInfo &LineInfo) {
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if (BlameLine) {
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outs() << "Blacklist Match: " << BlacklistFilename << ":" << BlameLine
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<< "\n";
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if (CFIProtected)
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outs() << "====> Unexpected Protected\n";
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else
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outs() << "====> Expected Unprotected\n";
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if (PrintBlameContextAll)
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printBlameContext(LineInfo, PrintBlameContextAll);
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} else {
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if (CFIProtected) {
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outs() << "====> Expected Protected\n";
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if (PrintBlameContextAll)
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printBlameContext(LineInfo, PrintBlameContextAll);
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} else {
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outs() << "====> Unexpected Unprotected (BAD)\n";
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if (PrintBlameContext)
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printBlameContext(LineInfo, PrintBlameContext);
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}
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}
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}
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static void
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printIndirectCFInstructions(FileAnalysis &Analysis,
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const SpecialCaseList *SpecialCaseList) {
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uint64_t ExpectedProtected = 0;
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uint64_t UnexpectedProtected = 0;
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uint64_t ExpectedUnprotected = 0;
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uint64_t UnexpectedUnprotected = 0;
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std::map<unsigned, uint64_t> BlameCounter;
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for (object::SectionedAddress Address : Analysis.getIndirectInstructions()) {
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const auto &InstrMeta = Analysis.getInstructionOrDie(Address.Address);
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GraphResult Graph = GraphBuilder::buildFlowGraph(Analysis, Address);
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CFIProtectionStatus ProtectionStatus =
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Analysis.validateCFIProtection(Graph);
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bool CFIProtected = (ProtectionStatus == CFIProtectionStatus::PROTECTED);
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if (!Summarize) {
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outs() << "-----------------------------------------------------\n";
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printInstructionInformation(Analysis, InstrMeta, Graph, ProtectionStatus);
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}
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if (IgnoreDWARFFlag) {
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if (CFIProtected)
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ExpectedProtected++;
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else
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UnexpectedUnprotected++;
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continue;
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}
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auto InliningInfo = Analysis.symbolizeInlinedCode(Address);
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if (!InliningInfo || InliningInfo->getNumberOfFrames() == 0) {
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errs() << "Failed to symbolise " << format_hex(Address.Address, 2)
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<< " with line tables from " << InputFilename << "\n";
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exit(EXIT_FAILURE);
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}
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const auto &LineInfo = InliningInfo->getFrame(0);
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// Print the inlining symbolisation of this instruction.
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if (!Summarize) {
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for (uint32_t i = 0; i < InliningInfo->getNumberOfFrames(); ++i) {
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const auto &Line = InliningInfo->getFrame(i);
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outs() << " " << format_hex(Address.Address, 2) << " = "
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<< Line.FileName << ":" << Line.Line << ":" << Line.Column
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<< " (" << Line.FunctionName << ")\n";
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}
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}
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if (!SpecialCaseList) {
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if (CFIProtected) {
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if (PrintBlameContextAll && !Summarize)
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printBlameContext(LineInfo, PrintBlameContextAll);
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ExpectedProtected++;
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} else {
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if (PrintBlameContext && !Summarize)
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printBlameContext(LineInfo, PrintBlameContext);
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UnexpectedUnprotected++;
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}
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continue;
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}
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unsigned BlameLine = 0;
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for (auto &K : {"cfi-icall", "cfi-vcall"}) {
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if (!BlameLine)
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BlameLine =
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SpecialCaseList->inSectionBlame(K, "src", LineInfo.FileName);
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if (!BlameLine)
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BlameLine =
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SpecialCaseList->inSectionBlame(K, "fun", LineInfo.FunctionName);
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}
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if (BlameLine) {
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BlameCounter[BlameLine]++;
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if (CFIProtected)
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UnexpectedProtected++;
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else
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ExpectedUnprotected++;
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} else {
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if (CFIProtected)
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ExpectedProtected++;
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else
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UnexpectedUnprotected++;
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}
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if (!Summarize)
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printInstructionStatus(BlameLine, CFIProtected, LineInfo);
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}
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uint64_t IndirectCFInstructions = ExpectedProtected + UnexpectedProtected +
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ExpectedUnprotected + UnexpectedUnprotected;
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if (IndirectCFInstructions == 0) {
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outs() << "No indirect CF instructions found.\n";
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return;
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}
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outs() << formatv("\nTotal Indirect CF Instructions: {0}\n"
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"Expected Protected: {1} ({2:P})\n"
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"Unexpected Protected: {3} ({4:P})\n"
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"Expected Unprotected: {5} ({6:P})\n"
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"Unexpected Unprotected (BAD): {7} ({8:P})\n",
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IndirectCFInstructions, ExpectedProtected,
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((double)ExpectedProtected) / IndirectCFInstructions,
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UnexpectedProtected,
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((double)UnexpectedProtected) / IndirectCFInstructions,
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ExpectedUnprotected,
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((double)ExpectedUnprotected) / IndirectCFInstructions,
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UnexpectedUnprotected,
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((double)UnexpectedUnprotected) / IndirectCFInstructions);
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if (!SpecialCaseList)
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return;
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outs() << "\nBlacklist Results:\n";
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for (const auto &KV : BlameCounter) {
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outs() << " " << BlacklistFilename << ":" << KV.first << " affects "
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<< KV.second << " indirect CF instructions.\n";
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}
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}
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int main(int argc, char **argv) {
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cl::HideUnrelatedOptions({&CFIVerifyCategory, &getColorCategory()});
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cl::ParseCommandLineOptions(
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argc, argv,
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"Identifies whether Control Flow Integrity protects all indirect control "
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"flow instructions in the provided object file, DSO or binary.\nNote: "
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"Anything statically linked into the provided file *must* be compiled "
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"with '-g'. This can be relaxed through the '--ignore-dwarf' flag.");
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InitializeAllTargetInfos();
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InitializeAllTargetMCs();
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InitializeAllAsmParsers();
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InitializeAllDisassemblers();
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if (PrintBlameContextAll && !PrintBlameContext)
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PrintBlameContext.setValue(PrintBlameContextAll);
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std::unique_ptr<SpecialCaseList> SpecialCaseList;
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if (BlacklistFilename != "-") {
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std::string Error;
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SpecialCaseList = SpecialCaseList::create({BlacklistFilename},
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*vfs::getRealFileSystem(), Error);
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if (!SpecialCaseList) {
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errs() << "Failed to get blacklist: " << Error << "\n";
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exit(EXIT_FAILURE);
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}
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}
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FileAnalysis Analysis = ExitOnErr(FileAnalysis::Create(InputFilename));
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printIndirectCFInstructions(Analysis, SpecialCaseList.get());
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return EXIT_SUCCESS;
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}
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