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usr / src / contrib / llvm-project / clang / lib / StaticAnalyzer / Checkers /

📁 ..
📄 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: CastToStructChecker.cpp

//=== CastToStructChecker.cpp ----------------------------------*- C++ -*--===//
//
// 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 files defines CastToStructChecker, a builtin checker that checks for
// cast from non-struct pointer to struct pointer and widening struct data cast.
// This check corresponds to CWE-588.
//
//===----------------------------------------------------------------------===//

#include "clang/StaticAnalyzer/Checkers/BuiltinCheckerRegistration.h"
#include "clang/AST/RecursiveASTVisitor.h"
#include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
#include "clang/StaticAnalyzer/Core/Checker.h"
#include "clang/StaticAnalyzer/Core/CheckerManager.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"

using namespace clang;
using namespace ento;

namespace {
class CastToStructVisitor : public RecursiveASTVisitor<CastToStructVisitor> {
  BugReporter &BR;
  const CheckerBase *Checker;
  AnalysisDeclContext *AC;

public:
  explicit CastToStructVisitor(BugReporter &B, const CheckerBase *Checker,
                               AnalysisDeclContext *A)
      : BR(B), Checker(Checker), AC(A) {}
  bool VisitCastExpr(const CastExpr *CE);
};
}

bool CastToStructVisitor::VisitCastExpr(const CastExpr *CE) {
  const Expr *E = CE->getSubExpr();
  ASTContext &Ctx = AC->getASTContext();
  QualType OrigTy = Ctx.getCanonicalType(E->getType());
  QualType ToTy = Ctx.getCanonicalType(CE->getType());

const PointerType *OrigPTy = dyn_cast<PointerType>(OrigTy.getTypePtr());
  const PointerType *ToPTy = dyn_cast<PointerType>(ToTy.getTypePtr());

if (!ToPTy || !OrigPTy)
    return true;

QualType OrigPointeeTy = OrigPTy->getPointeeType();
  QualType ToPointeeTy = ToPTy->getPointeeType();

if (!ToPointeeTy->isStructureOrClassType())
    return true;

// We allow cast from void*.
  if (OrigPointeeTy->isVoidType())
    return true;

// Now the cast-to-type is struct pointer, the original type is not void*.
  if (!OrigPointeeTy->isRecordType()) {
    SourceRange Sr[1] = {CE->getSourceRange()};
    PathDiagnosticLocation Loc(CE, BR.getSourceManager(), AC);
    BR.EmitBasicReport(
        AC->getDecl(), Checker, "Cast from non-struct type to struct type",
        categories::LogicError, "Casting a non-structure type to a structure "
                                "type and accessing a field can lead to memory "
                                "access errors or data corruption.",
        Loc, Sr);
  } else {
    // Don't warn when size of data is unknown.
    const auto *U = dyn_cast<UnaryOperator>(E);
    if (!U || U->getOpcode() != UO_AddrOf)
      return true;

// Don't warn for references
    const ValueDecl *VD = nullptr;
    if (const auto *SE = dyn_cast<DeclRefExpr>(U->getSubExpr()))
      VD = SE->getDecl();
    else if (const auto *SE = dyn_cast<MemberExpr>(U->getSubExpr()))
      VD = SE->getMemberDecl();
    if (!VD || VD->getType()->isReferenceType())
      return true;

if (ToPointeeTy->isIncompleteType() ||
        OrigPointeeTy->isIncompleteType())
      return true;

// Warn when there is widening cast.
    unsigned ToWidth = Ctx.getTypeInfo(ToPointeeTy).Width;
    unsigned OrigWidth = Ctx.getTypeInfo(OrigPointeeTy).Width;
    if (ToWidth <= OrigWidth)
      return true;

PathDiagnosticLocation Loc(CE, BR.getSourceManager(), AC);
    BR.EmitBasicReport(AC->getDecl(), Checker, "Widening cast to struct type",
                       categories::LogicError,
                       "Casting data to a larger structure type and accessing "
                       "a field can lead to memory access errors or data "
                       "corruption.",
                       Loc, CE->getSourceRange());
  }

return true;
}

namespace {
class CastToStructChecker : public Checker<check::ASTCodeBody> {
public:
  void checkASTCodeBody(const Decl *D, AnalysisManager &Mgr,
                        BugReporter &BR) const {
    CastToStructVisitor Visitor(BR, this, Mgr.getAnalysisDeclContext(D));
    Visitor.TraverseDecl(const_cast<Decl *>(D));
  }
};
} // end anonymous namespace

void ento::registerCastToStructChecker(CheckerManager &mgr) {
  mgr.registerChecker<CastToStructChecker>();
}

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

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Editing: CastToStructChecker.cpp

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