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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: MallocSizeofChecker.cpp

// MallocSizeofChecker.cpp - Check for dubious malloc arguments ---*- 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
//
//===----------------------------------------------------------------------===//
//
// Reports inconsistencies between the casted type of the return value of a
// malloc/calloc/realloc call and the operand of any sizeof expressions
// contained within its argument(s).
//
//===----------------------------------------------------------------------===//

#include "clang/StaticAnalyzer/Checkers/BuiltinCheckerRegistration.h"
#include "clang/AST/StmtVisitor.h"
#include "clang/AST/TypeLoc.h"
#include "clang/StaticAnalyzer/Core/BugReporter/BugReporter.h"
#include "clang/StaticAnalyzer/Core/Checker.h"
#include "clang/StaticAnalyzer/Core/CheckerManager.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/AnalysisManager.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/raw_ostream.h"

using namespace clang;
using namespace ento;

namespace {

typedef std::pair<const TypeSourceInfo *, const CallExpr *> TypeCallPair;
typedef llvm::PointerUnion<const Stmt *, const VarDecl *> ExprParent;

class CastedAllocFinder
  : public ConstStmtVisitor<CastedAllocFinder, TypeCallPair> {
  IdentifierInfo *II_malloc, *II_calloc, *II_realloc;

public:
  struct CallRecord {
    ExprParent CastedExprParent;
    const Expr *CastedExpr;
    const TypeSourceInfo *ExplicitCastType;
    const CallExpr *AllocCall;

CallRecord(ExprParent CastedExprParent, const Expr *CastedExpr,
               const TypeSourceInfo *ExplicitCastType,
               const CallExpr *AllocCall)
      : CastedExprParent(CastedExprParent), CastedExpr(CastedExpr),
        ExplicitCastType(ExplicitCastType), AllocCall(AllocCall) {}
  };

typedef std::vector<CallRecord> CallVec;
  CallVec Calls;

CastedAllocFinder(ASTContext *Ctx) :
    II_malloc(&Ctx->Idents.get("malloc")),
    II_calloc(&Ctx->Idents.get("calloc")),
    II_realloc(&Ctx->Idents.get("realloc")) {}

void VisitChild(ExprParent Parent, const Stmt *S) {
    TypeCallPair AllocCall = Visit(S);
    if (AllocCall.second && AllocCall.second != S)
      Calls.push_back(CallRecord(Parent, cast<Expr>(S), AllocCall.first,
                                 AllocCall.second));
  }

void VisitChildren(const Stmt *S) {
    for (const Stmt *Child : S->children())
      if (Child)
        VisitChild(S, Child);
  }

TypeCallPair VisitCastExpr(const CastExpr *E) {
    return Visit(E->getSubExpr());
  }

TypeCallPair VisitExplicitCastExpr(const ExplicitCastExpr *E) {
    return TypeCallPair(E->getTypeInfoAsWritten(),
                        Visit(E->getSubExpr()).second);
  }

TypeCallPair VisitParenExpr(const ParenExpr *E) {
    return Visit(E->getSubExpr());
  }

TypeCallPair VisitStmt(const Stmt *S) {
    VisitChildren(S);
    return TypeCallPair();
  }

TypeCallPair VisitCallExpr(const CallExpr *E) {
    VisitChildren(E);
    const FunctionDecl *FD = E->getDirectCallee();
    if (FD) {
      IdentifierInfo *II = FD->getIdentifier();
      if (II == II_malloc || II == II_calloc || II == II_realloc)
        return TypeCallPair((const TypeSourceInfo *)nullptr, E);
    }
    return TypeCallPair();
  }

TypeCallPair VisitDeclStmt(const DeclStmt *S) {
    for (const auto *I : S->decls())
      if (const VarDecl *VD = dyn_cast<VarDecl>(I))
        if (const Expr *Init = VD->getInit())
          VisitChild(VD, Init);
    return TypeCallPair();
  }
};

class SizeofFinder : public ConstStmtVisitor<SizeofFinder> {
public:
  std::vector<const UnaryExprOrTypeTraitExpr *> Sizeofs;

void VisitBinMul(const BinaryOperator *E) {
    Visit(E->getLHS());
    Visit(E->getRHS());
  }

void VisitImplicitCastExpr(const ImplicitCastExpr *E) {
    return Visit(E->getSubExpr());
  }

void VisitParenExpr(const ParenExpr *E) {
    return Visit(E->getSubExpr());
  }

void VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E) {
    if (E->getKind() != UETT_SizeOf)
      return;

Sizeofs.push_back(E);
  }
};

// Determine if the pointee and sizeof types are compatible.  Here
// we ignore constness of pointer types.
static bool typesCompatible(ASTContext &C, QualType A, QualType B) {
  // sizeof(void*) is compatible with any other pointer.
  if (B->isVoidPointerType() && A->getAs<PointerType>())
    return true;

while (true) {
    A = A.getCanonicalType();
    B = B.getCanonicalType();

if (A.getTypePtr() == B.getTypePtr())
      return true;

if (const PointerType *ptrA = A->getAs<PointerType>())
      if (const PointerType *ptrB = B->getAs<PointerType>()) {
        A = ptrA->getPointeeType();
        B = ptrB->getPointeeType();
        continue;
      }

break;
  }

return false;
}

static bool compatibleWithArrayType(ASTContext &C, QualType PT, QualType T) {
  // Ex: 'int a[10][2]' is compatible with 'int', 'int[2]', 'int[10][2]'.
  while (const ArrayType *AT = T->getAsArrayTypeUnsafe()) {
    QualType ElemType = AT->getElementType();
    if (typesCompatible(C, PT, AT->getElementType()))
      return true;
    T = ElemType;
  }

return false;
}

class MallocSizeofChecker : public Checker<check::ASTCodeBody> {
public:
  void checkASTCodeBody(const Decl *D, AnalysisManager& mgr,
                        BugReporter &BR) const {
    AnalysisDeclContext *ADC = mgr.getAnalysisDeclContext(D);
    CastedAllocFinder Finder(&BR.getContext());
    Finder.Visit(D->getBody());
    for (CastedAllocFinder::CallVec::iterator i = Finder.Calls.begin(),
         e = Finder.Calls.end(); i != e; ++i) {
      QualType CastedType = i->CastedExpr->getType();
      if (!CastedType->isPointerType())
        continue;
      QualType PointeeType = CastedType->getPointeeType();
      if (PointeeType->isVoidType())
        continue;

for (CallExpr::const_arg_iterator ai = i->AllocCall->arg_begin(),
           ae = i->AllocCall->arg_end(); ai != ae; ++ai) {
        if (!(*ai)->getType()->isIntegralOrUnscopedEnumerationType())
          continue;

SizeofFinder SFinder;
        SFinder.Visit(*ai);
        if (SFinder.Sizeofs.size() != 1)
          continue;

QualType SizeofType = SFinder.Sizeofs[0]->getTypeOfArgument();

if (typesCompatible(BR.getContext(), PointeeType, SizeofType))
          continue;

// If the argument to sizeof is an array, the result could be a
        // pointer to any array element.
        if (compatibleWithArrayType(BR.getContext(), PointeeType, SizeofType))
          continue;

const TypeSourceInfo *TSI = nullptr;
        if (i->CastedExprParent.is<const VarDecl *>()) {
          TSI =
              i->CastedExprParent.get<const VarDecl *>()->getTypeSourceInfo();
        } else {
          TSI = i->ExplicitCastType;
        }

SmallString<64> buf;
        llvm::raw_svector_ostream OS(buf);

OS << "Result of ";
        const FunctionDecl *Callee = i->AllocCall->getDirectCallee();
        if (Callee && Callee->getIdentifier())
          OS << '\'' << Callee->getIdentifier()->getName() << '\'';
        else
          OS << "call";
        OS << " is converted to a pointer of type '"
            << PointeeType.getAsString() << "', which is incompatible with "
            << "sizeof operand type '" << SizeofType.getAsString() << "'";
        SmallVector<SourceRange, 4> Ranges;
        Ranges.push_back(i->AllocCall->getCallee()->getSourceRange());
        Ranges.push_back(SFinder.Sizeofs[0]->getSourceRange());
        if (TSI)
          Ranges.push_back(TSI->getTypeLoc().getSourceRange());

PathDiagnosticLocation L =
            PathDiagnosticLocation::createBegin(i->AllocCall->getCallee(),
                BR.getSourceManager(), ADC);

BR.EmitBasicReport(D, this, "Allocator sizeof operand mismatch",
                           categories::UnixAPI, OS.str(), L, Ranges);
      }
    }
  }
};

}

void ento::registerMallocSizeofChecker(CheckerManager &mgr) {
  mgr.registerChecker<MallocSizeofChecker>();
}

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

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Editing: MallocSizeofChecker.cpp

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