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📄 AllocationState.h(1.41 KB)
📄 AnalysisOrderChecker.cpp(8.62 KB)
📄 AnalyzerStatsChecker.cpp(5.04 KB)
📄 ArrayBoundChecker.cpp(3.22 KB)
📄 ArrayBoundCheckerV2.cpp(13.07 KB)
📄 BasicObjCFoundationChecks.cpp(43.82 KB)
📄 BlockInCriticalSectionChecker.cpp(6.69 KB)
📄 BoolAssignmentChecker.cpp(3.45 KB)
📄 BuiltinFunctionChecker.cpp(5 KB)
📄 CStringChecker.cpp(93.24 KB)
📄 CStringSyntaxChecker.cpp(9.8 KB)
📄 CXXSelfAssignmentChecker.cpp(3.08 KB)
📄 CallAndMessageChecker.cpp(26.57 KB)
📄 CastSizeChecker.cpp(4.96 KB)
📄 CastToStructChecker.cpp(4.43 KB)
📄 CastValueChecker.cpp(19.65 KB)
📄 CheckObjCDealloc.cpp(37.83 KB)
📄 CheckObjCInstMethSignature.cpp(4.8 KB)
📄 CheckPlacementNew.cpp(11.91 KB)
📄 CheckSecuritySyntaxOnly.cpp(38.79 KB)
📄 CheckSizeofPointer.cpp(3.16 KB)
📄 CheckerDocumentation.cpp(14.64 KB)
📄 ChrootChecker.cpp(4.88 KB)
📄 CloneChecker.cpp(8.28 KB)
📄 ContainerModeling.cpp(39.85 KB)
📄 ConversionChecker.cpp(7.11 KB)
📄 DeadStoresChecker.cpp(17.82 KB)
📄 DebugCheckers.cpp(10.41 KB)
📄 DebugContainerModeling.cpp(4.94 KB)
📄 DebugIteratorModeling.cpp(5.15 KB)
📄 DeleteWithNonVirtualDtorChecker.cpp(5.35 KB)
📄 DereferenceChecker.cpp(10.54 KB)
📄 DirectIvarAssignment.cpp(8.02 KB)
📄 DivZeroChecker.cpp(3.42 KB)
📄 DynamicTypeChecker.cpp(7.31 KB)
📄 DynamicTypePropagation.cpp(42.11 KB)
📄 EnumCastOutOfRangeChecker.cpp(5.75 KB)
📄 ExprInspectionChecker.cpp(15.6 KB)
📄 FixedAddressChecker.cpp(2.33 KB)
📄 FuchsiaHandleChecker.cpp(23.1 KB)
📄 GCDAntipatternChecker.cpp(7.85 KB)
📄 GTestChecker.cpp(10.52 KB)
📄 GenericTaintChecker.cpp(34.31 KB)
📄 IdenticalExprChecker.cpp(18.88 KB)
📄 InnerPointerChecker.cpp(11.54 KB)
📄 InterCheckerAPI.h(1.09 KB)
📄 InvalidatedIteratorChecker.cpp(4.93 KB)
📄 Iterator.cpp(10.62 KB)
📄 Iterator.h(6.32 KB)
📄 IteratorModeling.cpp(31.33 KB)
📄 IteratorRangeChecker.cpp(12.64 KB)
📄 IvarInvalidationChecker.cpp(27.63 KB)
📄 LLVMConventionsChecker.cpp(9.9 KB)
📄 LocalizationChecker.cpp(52.38 KB)
📄 MIGChecker.cpp(11.3 KB)
📁 MPI-Checker
📄 MacOSKeychainAPIChecker.cpp(25.21 KB)
📄 MacOSXAPIChecker.cpp(6.61 KB)
📄 MallocChecker.cpp(127.38 KB)
📄 MallocOverflowSecurityChecker.cpp(11.91 KB)
📄 MallocSizeofChecker.cpp(8.03 KB)
📄 MismatchedIteratorChecker.cpp(11.01 KB)
📄 MmapWriteExecChecker.cpp(3.22 KB)
📄 Move.h(1.07 KB)
📄 MoveChecker.cpp(27 KB)
📄 NSAutoreleasePoolChecker.cpp(2.93 KB)
📄 NSErrorChecker.cpp(10.6 KB)
📄 NoReturnFunctionChecker.cpp(5.48 KB)
📄 NonNullParamChecker.cpp(11.22 KB)
📄 NonnullGlobalConstantsChecker.cpp(5.09 KB)
📄 NullabilityChecker.cpp(46.95 KB)
📄 NumberObjectConversionChecker.cpp(13.69 KB)
📄 OSObjectCStyleCast.cpp(3.14 KB)
📄 ObjCAtSyncChecker.cpp(3.34 KB)
📄 ObjCAutoreleaseWriteChecker.cpp(8.62 KB)
📄 ObjCContainersASTChecker.cpp(5.5 KB)
📄 ObjCContainersChecker.cpp(6.71 KB)
📄 ObjCMissingSuperCallChecker.cpp(9.23 KB)
📄 ObjCPropertyChecker.cpp(3.03 KB)
📄 ObjCSelfInitChecker.cpp(16.21 KB)
📄 ObjCSuperDeallocChecker.cpp(9.33 KB)
📄 ObjCUnusedIVarsChecker.cpp(6.01 KB)
📄 PaddingChecker.cpp(14.26 KB)
📄 PointerArithChecker.cpp(12.18 KB)
📄 PointerIterationChecker.cpp(3.79 KB)
📄 PointerSortingChecker.cpp(4.5 KB)
📄 PointerSubChecker.cpp(2.56 KB)
📄 PthreadLockChecker.cpp(28.42 KB)
📁 RetainCountChecker
📄 ReturnPointerRangeChecker.cpp(3.39 KB)
📄 ReturnUndefChecker.cpp(4.1 KB)
📄 ReturnValueChecker.cpp(5.79 KB)
📄 RunLoopAutoreleaseLeakChecker.cpp(7.2 KB)
📄 STLAlgorithmModeling.cpp(7 KB)
📄 SimpleStreamChecker.cpp(9.43 KB)
📄 SmartPtr.h(1.17 KB)
📄 SmartPtrChecker.cpp(2.68 KB)
📄 SmartPtrModeling.cpp(8.05 KB)
📄 StackAddrEscapeChecker.cpp(15 KB)
📄 StdLibraryFunctionsChecker.cpp(74.86 KB)
📄 StreamChecker.cpp(37.36 KB)
📄 Taint.cpp(9.04 KB)
📄 Taint.h(4.19 KB)
📄 TaintTesterChecker.cpp(2.17 KB)
📄 TestAfterDivZeroChecker.cpp(8.19 KB)
📄 TraversalChecker.cpp(4.38 KB)
📄 TrustNonnullChecker.cpp(9.12 KB)
📄 UndefBranchChecker.cpp(3.82 KB)
📄 UndefCapturedBlockVarChecker.cpp(3.64 KB)
📄 UndefResultChecker.cpp(7.19 KB)
📄 UndefinedArraySubscriptChecker.cpp(2.36 KB)
📄 UndefinedAssignmentChecker.cpp(3.74 KB)
📁 UninitializedObject
📄 UnixAPIChecker.cpp(18.05 KB)
📄 UnreachableCodeChecker.cpp(9.59 KB)
📄 VLASizeChecker.cpp(10.95 KB)
📄 ValistChecker.cpp(15.65 KB)
📄 VforkChecker.cpp(7.67 KB)
📄 VirtualCallChecker.cpp(8.11 KB)
📁 WebKit
📄 Yaml.h(2.06 KB)
📁 cert

Editing: TestAfterDivZeroChecker.cpp

//== TestAfterDivZeroChecker.cpp - Test after division by zero checker --*--==//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This defines TestAfterDivZeroChecker, a builtin check that performs checks
//  for division by zero where the division occurs before comparison with zero.
//
//===----------------------------------------------------------------------===//

#include "clang/StaticAnalyzer/Checkers/BuiltinCheckerRegistration.h"
#include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
#include "clang/StaticAnalyzer/Core/Checker.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/CallEvent.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
#include "llvm/ADT/FoldingSet.h"

using namespace clang;
using namespace ento;

namespace {

class ZeroState {
private:
  SymbolRef ZeroSymbol;
  unsigned BlockID;
  const StackFrameContext *SFC;

public:
  ZeroState(SymbolRef S, unsigned B, const StackFrameContext *SFC)
      : ZeroSymbol(S), BlockID(B), SFC(SFC) {}

const StackFrameContext *getStackFrameContext() const { return SFC; }

bool operator==(const ZeroState &X) const {
    return BlockID == X.BlockID && SFC == X.SFC && ZeroSymbol == X.ZeroSymbol;
  }

bool operator<(const ZeroState &X) const {
    if (BlockID != X.BlockID)
      return BlockID < X.BlockID;
    if (SFC != X.SFC)
      return SFC < X.SFC;
    return ZeroSymbol < X.ZeroSymbol;
  }

void Profile(llvm::FoldingSetNodeID &ID) const {
    ID.AddInteger(BlockID);
    ID.AddPointer(SFC);
    ID.AddPointer(ZeroSymbol);
  }
};

class DivisionBRVisitor : public BugReporterVisitor {
private:
  SymbolRef ZeroSymbol;
  const StackFrameContext *SFC;
  bool Satisfied;

public:
  DivisionBRVisitor(SymbolRef ZeroSymbol, const StackFrameContext *SFC)
      : ZeroSymbol(ZeroSymbol), SFC(SFC), Satisfied(false) {}

void Profile(llvm::FoldingSetNodeID &ID) const override {
    ID.Add(ZeroSymbol);
    ID.Add(SFC);
  }

PathDiagnosticPieceRef VisitNode(const ExplodedNode *Succ,
                                   BugReporterContext &BRC,
                                   PathSensitiveBugReport &BR) override;
};

class TestAfterDivZeroChecker
    : public Checker<check::PreStmt<BinaryOperator>, check::BranchCondition,
                     check::EndFunction> {
  mutable std::unique_ptr<BuiltinBug> DivZeroBug;
  void reportBug(SVal Val, CheckerContext &C) const;

public:
  void checkPreStmt(const BinaryOperator *B, CheckerContext &C) const;
  void checkBranchCondition(const Stmt *Condition, CheckerContext &C) const;
  void checkEndFunction(const ReturnStmt *RS, CheckerContext &C) const;
  void setDivZeroMap(SVal Var, CheckerContext &C) const;
  bool hasDivZeroMap(SVal Var, const CheckerContext &C) const;
  bool isZero(SVal S, CheckerContext &C) const;
};
} // end anonymous namespace

REGISTER_SET_WITH_PROGRAMSTATE(DivZeroMap, ZeroState)

PathDiagnosticPieceRef
DivisionBRVisitor::VisitNode(const ExplodedNode *Succ, BugReporterContext &BRC,
                             PathSensitiveBugReport &BR) {
  if (Satisfied)
    return nullptr;

const Expr *E = nullptr;

if (Optional<PostStmt> P = Succ->getLocationAs<PostStmt>())
    if (const BinaryOperator *BO = P->getStmtAs<BinaryOperator>()) {
      BinaryOperator::Opcode Op = BO->getOpcode();
      if (Op == BO_Div || Op == BO_Rem || Op == BO_DivAssign ||
          Op == BO_RemAssign) {
        E = BO->getRHS();
      }
    }

if (!E)
    return nullptr;

SVal S = Succ->getSVal(E);
  if (ZeroSymbol == S.getAsSymbol() && SFC == Succ->getStackFrame()) {
    Satisfied = true;

// Construct a new PathDiagnosticPiece.
    ProgramPoint P = Succ->getLocation();
    PathDiagnosticLocation L =
        PathDiagnosticLocation::create(P, BRC.getSourceManager());

if (!L.isValid() || !L.asLocation().isValid())
      return nullptr;

return std::make_shared<PathDiagnosticEventPiece>(
        L, "Division with compared value made here");
  }

return nullptr;
}

bool TestAfterDivZeroChecker::isZero(SVal S, CheckerContext &C) const {
  Optional<DefinedSVal> DSV = S.getAs<DefinedSVal>();

if (!DSV)
    return false;

ConstraintManager &CM = C.getConstraintManager();
  return !CM.assume(C.getState(), *DSV, true);
}

void TestAfterDivZeroChecker::setDivZeroMap(SVal Var, CheckerContext &C) const {
  SymbolRef SR = Var.getAsSymbol();
  if (!SR)
    return;

ProgramStateRef State = C.getState();
  State =
      State->add<DivZeroMap>(ZeroState(SR, C.getBlockID(), C.getStackFrame()));
  C.addTransition(State);
}

bool TestAfterDivZeroChecker::hasDivZeroMap(SVal Var,
                                            const CheckerContext &C) const {
  SymbolRef SR = Var.getAsSymbol();
  if (!SR)
    return false;

ZeroState ZS(SR, C.getBlockID(), C.getStackFrame());
  return C.getState()->contains<DivZeroMap>(ZS);
}

void TestAfterDivZeroChecker::reportBug(SVal Val, CheckerContext &C) const {
  if (ExplodedNode *N = C.generateErrorNode(C.getState())) {
    if (!DivZeroBug)
      DivZeroBug.reset(new BuiltinBug(this, "Division by zero"));

auto R = std::make_unique<PathSensitiveBugReport>(
        *DivZeroBug, "Value being compared against zero has already been used "
                     "for division",
        N);

R->addVisitor(std::make_unique<DivisionBRVisitor>(Val.getAsSymbol(),
                                                       C.getStackFrame()));
    C.emitReport(std::move(R));
  }
}

void TestAfterDivZeroChecker::checkEndFunction(const ReturnStmt *,
                                               CheckerContext &C) const {
  ProgramStateRef State = C.getState();

DivZeroMapTy DivZeroes = State->get<DivZeroMap>();
  if (DivZeroes.isEmpty())
    return;

DivZeroMapTy::Factory &F = State->get_context<DivZeroMap>();
  for (llvm::ImmutableSet<ZeroState>::iterator I = DivZeroes.begin(),
                                               E = DivZeroes.end();
       I != E; ++I) {
    ZeroState ZS = *I;
    if (ZS.getStackFrameContext() == C.getStackFrame())
      DivZeroes = F.remove(DivZeroes, ZS);
  }
  C.addTransition(State->set<DivZeroMap>(DivZeroes));
}

void TestAfterDivZeroChecker::checkPreStmt(const BinaryOperator *B,
                                           CheckerContext &C) const {
  BinaryOperator::Opcode Op = B->getOpcode();
  if (Op == BO_Div || Op == BO_Rem || Op == BO_DivAssign ||
      Op == BO_RemAssign) {
    SVal S = C.getSVal(B->getRHS());

if (!isZero(S, C))
      setDivZeroMap(S, C);
  }
}

void TestAfterDivZeroChecker::checkBranchCondition(const Stmt *Condition,
                                                   CheckerContext &C) const {
  if (const BinaryOperator *B = dyn_cast<BinaryOperator>(Condition)) {
    if (B->isComparisonOp()) {
      const IntegerLiteral *IntLiteral = dyn_cast<IntegerLiteral>(B->getRHS());
      bool LRHS = true;
      if (!IntLiteral) {
        IntLiteral = dyn_cast<IntegerLiteral>(B->getLHS());
        LRHS = false;
      }

if (!IntLiteral || IntLiteral->getValue() != 0)
        return;

SVal Val = C.getSVal(LRHS ? B->getLHS() : B->getRHS());
      if (hasDivZeroMap(Val, C))
        reportBug(Val, C);
    }
  } else if (const UnaryOperator *U = dyn_cast<UnaryOperator>(Condition)) {
    if (U->getOpcode() == UO_LNot) {
      SVal Val;
      if (const ImplicitCastExpr *I =
              dyn_cast<ImplicitCastExpr>(U->getSubExpr()))
        Val = C.getSVal(I->getSubExpr());

if (hasDivZeroMap(Val, C))
        reportBug(Val, C);
      else {
        Val = C.getSVal(U->getSubExpr());
        if (hasDivZeroMap(Val, C))
          reportBug(Val, C);
      }
    }
  } else if (const ImplicitCastExpr *IE =
                 dyn_cast<ImplicitCastExpr>(Condition)) {
    SVal Val = C.getSVal(IE->getSubExpr());

if (hasDivZeroMap(Val, C))
      reportBug(Val, C);
    else {
      SVal Val = C.getSVal(Condition);

if (hasDivZeroMap(Val, C))
        reportBug(Val, C);
    }
  }
}

void ento::registerTestAfterDivZeroChecker(CheckerManager &mgr) {
  mgr.registerChecker<TestAfterDivZeroChecker>();
}

bool ento::shouldRegisterTestAfterDivZeroChecker(const CheckerManager &mgr) {
  return true;
}

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Editing: TestAfterDivZeroChecker.cpp

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