void MacOSKeychainAPIChecker::checkPreStmt(const CallExpr *CE,
CheckerContext &C) const {
unsigned idx = InvalidIdx;
const ProgramState *State = C.getState();
StringRef funName = C.getCalleeName(CE);
if (funName.empty())
return;
// If it is a call to an allocator function, it could be a double allocation.
idx = getTrackedFunctionIndex(funName, true);
if (idx != InvalidIdx) {
const Expr *ArgExpr = CE->getArg(FunctionsToTrack[idx].Param);
if (SymbolRef V = getAsPointeeSymbol(ArgExpr, C))
if (const AllocationState *AS = State->get<AllocatedData>(V)) {
if (!definitelyReturnedError(AS->Region, State, C.getSValBuilder())) {
// Remove the value from the state. The new symbol will be added for
// tracking when the second allocator is processed in checkPostStmt().
State = State->remove<AllocatedData>(V);
ExplodedNode *N = C.addTransition(State);
if (!N)
return;
initBugType();
llvm::SmallString<128> sbuf;
llvm::raw_svector_ostream os(sbuf);
unsigned int DIdx = FunctionsToTrack[AS->AllocatorIdx].DeallocatorIdx;
os << "Allocated data should be released before another call to "
<< "the allocator: missing a call to '"
<< FunctionsToTrack[DIdx].Name
<< "'.";
BugReport *Report = new BugReport(*BT, os.str(), N);
Report->addVisitor(new SecKeychainBugVisitor(V));
Report->addRange(ArgExpr->getSourceRange());
C.EmitReport(Report);
}
}
return;
}
// Is it a call to one of deallocator functions?
idx = getTrackedFunctionIndex(funName, false);
if (idx == InvalidIdx)
return;
// Check the argument to the deallocator.
const Expr *ArgExpr = CE->getArg(FunctionsToTrack[idx].Param);
SVal ArgSVal = State->getSVal(ArgExpr, C.getLocationContext());
// Undef is reported by another checker.
if (ArgSVal.isUndef())
return;
const MemRegion *Arg = ArgSVal.getAsRegion();
if (!Arg)
return;
SymbolRef ArgSM = getSymbolForRegion(C, Arg);
bool RegionArgIsBad = ArgSM ? false : isBadDeallocationArgument(Arg);
// If the argument is coming from the heap, globals, or unknown, do not
// report it.
if (!ArgSM && !RegionArgIsBad)
return;
// Is the argument to the call being tracked?
const AllocationState *AS = State->get<AllocatedData>(ArgSM);
if (!AS && FunctionsToTrack[idx].Kind != ValidAPI) {
return;
}
// If trying to free data which has not been allocated yet, report as a bug.
// TODO: We might want a more precise diagnostic for double free
// (that would involve tracking all the freed symbols in the checker state).
if (!AS || RegionArgIsBad) {
// It is possible that this is a false positive - the argument might
// have entered as an enclosing function parameter.
if (isEnclosingFunctionParam(ArgExpr))
return;
ExplodedNode *N = C.addTransition(State);
if (!N)
return;
initBugType();
BugReport *Report = new BugReport(*BT,
"Trying to free data which has not been allocated.", N);
Report->addRange(ArgExpr->getSourceRange());
C.EmitReport(Report);
return;
}
// Process functions which might deallocate.
if (FunctionsToTrack[idx].Kind == PossibleAPI) {
if (funName == "CFStringCreateWithBytesNoCopy") {
const Expr *DeallocatorExpr = CE->getArg(5)->IgnoreParenCasts();
// NULL ~ default deallocator, so warn.
if (DeallocatorExpr->isNullPointerConstant(C.getASTContext(),
Expr::NPC_ValueDependentIsNotNull)) {
const AllocationPair AP = std::make_pair(ArgSM, AS);
generateDeallocatorMismatchReport(AP, ArgExpr, C);
return;
}
// One of the default allocators, so warn.
if (const DeclRefExpr *DE = dyn_cast<DeclRefExpr>(DeallocatorExpr)) {
StringRef DeallocatorName = DE->getFoundDecl()->getName();
if (DeallocatorName == "kCFAllocatorDefault" ||
DeallocatorName == "kCFAllocatorSystemDefault" ||
DeallocatorName == "kCFAllocatorMalloc") {
const AllocationPair AP = std::make_pair(ArgSM, AS);
generateDeallocatorMismatchReport(AP, ArgExpr, C);
return;
}
// If kCFAllocatorNull, which does not deallocate, we still have to
// find the deallocator. Otherwise, assume that the user had written a
// custom deallocator which does the right thing.
if (DE->getFoundDecl()->getName() != "kCFAllocatorNull") {
State = State->remove<AllocatedData>(ArgSM);
C.addTransition(State);
return;
}
}
}
return;
}
// The call is deallocating a value we previously allocated, so remove it
// from the next state.
State = State->remove<AllocatedData>(ArgSM);
// Check if the proper deallocator is used.
unsigned int PDeallocIdx = FunctionsToTrack[AS->AllocatorIdx].DeallocatorIdx;
if (PDeallocIdx != idx || (FunctionsToTrack[idx].Kind == ErrorAPI)) {
const AllocationPair AP = std::make_pair(ArgSM, AS);
generateDeallocatorMismatchReport(AP, ArgExpr, C);
return;
}
// If the buffer can be null and the return status can be an error,
// report a bad call to free.
if (State->assume(cast<DefinedSVal>(ArgSVal), false) &&
!definitelyDidnotReturnError(AS->Region, State, C.getSValBuilder())) {
ExplodedNode *N = C.addTransition(State);
if (!N)
return;
initBugType();
BugReport *Report = new BugReport(*BT,
"Only call free if a valid (non-NULL) buffer was returned.", N);
Report->addVisitor(new SecKeychainBugVisitor(ArgSM));
Report->addRange(ArgExpr->getSourceRange());
C.EmitReport(Report);
return;
}
C.addTransition(State);
}
void CFNumberCreateChecker::checkPreStmt(const CallExpr *CE,
CheckerContext &C) const {
const Expr *Callee = CE->getCallee();
const ProgramState *state = C.getState();
SVal CallV = state->getSVal(Callee);
const FunctionDecl *FD = CallV.getAsFunctionDecl();
if (!FD)
return;
ASTContext &Ctx = C.getASTContext();
if (!II)
II = &Ctx.Idents.get("CFNumberCreate");
if (FD->getIdentifier() != II || CE->getNumArgs() != 3)
return;
// Get the value of the "theType" argument.
SVal TheTypeVal = state->getSVal(CE->getArg(1));
// FIXME: We really should allow ranges of valid theType values, and
// bifurcate the state appropriately.
nonloc::ConcreteInt* V = dyn_cast<nonloc::ConcreteInt>(&TheTypeVal);
if (!V)
return;
uint64_t NumberKind = V->getValue().getLimitedValue();
Optional<uint64_t> TargetSize = GetCFNumberSize(Ctx, NumberKind);
// FIXME: In some cases we can emit an error.
if (!TargetSize.isKnown())
return;
// Look at the value of the integer being passed by reference. Essentially
// we want to catch cases where the value passed in is not equal to the
// size of the type being created.
SVal TheValueExpr = state->getSVal(CE->getArg(2));
// FIXME: Eventually we should handle arbitrary locations. We can do this
// by having an enhanced memory model that does low-level typing.
loc::MemRegionVal* LV = dyn_cast<loc::MemRegionVal>(&TheValueExpr);
if (!LV)
return;
const TypedValueRegion* R = dyn_cast<TypedValueRegion>(LV->stripCasts());
if (!R)
return;
QualType T = Ctx.getCanonicalType(R->getValueType());
// FIXME: If the pointee isn't an integer type, should we flag a warning?
// People can do weird stuff with pointers.
if (!T->isIntegerType())
return;
uint64_t SourceSize = Ctx.getTypeSize(T);
// CHECK: is SourceSize == TargetSize
if (SourceSize == TargetSize)
return;
// Generate an error. Only generate a sink if 'SourceSize < TargetSize';
// otherwise generate a regular node.
//
// FIXME: We can actually create an abstract "CFNumber" object that has
// the bits initialized to the provided values.
//
if (ExplodedNode *N = SourceSize < TargetSize ? C.generateSink()
: C.generateNode()) {
llvm::SmallString<128> sbuf;
llvm::raw_svector_ostream os(sbuf);
os << (SourceSize == 8 ? "An " : "A ")
<< SourceSize << " bit integer is used to initialize a CFNumber "
"object that represents "
<< (TargetSize == 8 ? "an " : "a ")
<< TargetSize << " bit integer. ";
if (SourceSize < TargetSize)
os << (TargetSize - SourceSize)
<< " bits of the CFNumber value will be garbage." ;
else
os << (SourceSize - TargetSize)
<< " bits of the input integer will be lost.";
if (!BT)
BT.reset(new APIMisuse("Bad use of CFNumberCreate"));
BugReport *report = new BugReport(*BT, os.str(), N);
report->addRange(CE->getArg(2)->getSourceRange());
C.EmitReport(report);
}
}
void CFRetainReleaseChecker::checkPreStmt(const CallExpr *CE,
CheckerContext &C) const {
// If the CallExpr doesn't have exactly 1 argument just give up checking.
if (CE->getNumArgs() != 1)
return;
ProgramStateRef state = C.getState();
const FunctionDecl *FD = C.getCalleeDecl(CE);
if (!FD)
return;
if (!BT) {
ASTContext &Ctx = C.getASTContext();
Retain = &Ctx.Idents.get("CFRetain");
Release = &Ctx.Idents.get("CFRelease");
BT.reset(new APIMisuse("null passed to CFRetain/CFRelease"));
}
// Check if we called CFRetain/CFRelease.
const IdentifierInfo *FuncII = FD->getIdentifier();
if (!(FuncII == Retain || FuncII == Release))
return;
// FIXME: The rest of this just checks that the argument is non-null.
// It should probably be refactored and combined with AttrNonNullChecker.
// Get the argument's value.
const Expr *Arg = CE->getArg(0);
SVal ArgVal = state->getSVal(Arg, C.getLocationContext());
DefinedSVal *DefArgVal = dyn_cast<DefinedSVal>(&ArgVal);
if (!DefArgVal)
return;
// Get a NULL value.
SValBuilder &svalBuilder = C.getSValBuilder();
DefinedSVal zero = cast<DefinedSVal>(svalBuilder.makeZeroVal(Arg->getType()));
// Make an expression asserting that they're equal.
DefinedOrUnknownSVal ArgIsNull = svalBuilder.evalEQ(state, zero, *DefArgVal);
// Are they equal?
ProgramStateRef stateTrue, stateFalse;
llvm::tie(stateTrue, stateFalse) = state->assume(ArgIsNull);
if (stateTrue && !stateFalse) {
ExplodedNode *N = C.generateSink(stateTrue);
if (!N)
return;
const char *description = (FuncII == Retain)
? "Null pointer argument in call to CFRetain"
: "Null pointer argument in call to CFRelease";
BugReport *report = new BugReport(*BT, description, N);
report->addRange(Arg->getSourceRange());
report->addVisitor(bugreporter::getTrackNullOrUndefValueVisitor(N, Arg,
report));
C.EmitReport(report);
return;
}
// From here on, we know the argument is non-null.
C.addTransition(stateFalse);
}
void VariadicMethodTypeChecker::checkPreObjCMessage(const ObjCMethodCall &msg,
CheckerContext &C) const {
if (!BT) {
BT.reset(new APIMisuse("Arguments passed to variadic method aren't all "
"Objective-C pointer types"));
ASTContext &Ctx = C.getASTContext();
arrayWithObjectsS = GetUnarySelector("arrayWithObjects", Ctx);
dictionaryWithObjectsAndKeysS =
GetUnarySelector("dictionaryWithObjectsAndKeys", Ctx);
setWithObjectsS = GetUnarySelector("setWithObjects", Ctx);
orderedSetWithObjectsS = GetUnarySelector("orderedSetWithObjects", Ctx);
initWithObjectsS = GetUnarySelector("initWithObjects", Ctx);
initWithObjectsAndKeysS = GetUnarySelector("initWithObjectsAndKeys", Ctx);
}
if (!isVariadicMessage(msg))
return;
// We are not interested in the selector arguments since they have
// well-defined types, so the compiler will issue a warning for them.
unsigned variadicArgsBegin = msg.getSelector().getNumArgs();
// We're not interested in the last argument since it has to be nil or the
// compiler would have issued a warning for it elsewhere.
unsigned variadicArgsEnd = msg.getNumArgs() - 1;
if (variadicArgsEnd <= variadicArgsBegin)
return;
// Verify that all arguments have Objective-C types.
llvm::Optional<ExplodedNode*> errorNode;
ProgramStateRef state = C.getState();
for (unsigned I = variadicArgsBegin; I != variadicArgsEnd; ++I) {
QualType ArgTy = msg.getArgExpr(I)->getType();
if (ArgTy->isObjCObjectPointerType())
continue;
// Block pointers are treaded as Objective-C pointers.
if (ArgTy->isBlockPointerType())
continue;
// Ignore pointer constants.
if (isa<loc::ConcreteInt>(msg.getArgSVal(I)))
continue;
// Ignore pointer types annotated with 'NSObject' attribute.
if (C.getASTContext().isObjCNSObjectType(ArgTy))
continue;
// Ignore CF references, which can be toll-free bridged.
if (coreFoundation::isCFObjectRef(ArgTy))
continue;
// Generate only one error node to use for all bug reports.
if (!errorNode.hasValue())
errorNode = C.addTransition();
if (!errorNode.getValue())
continue;
SmallString<128> sbuf;
llvm::raw_svector_ostream os(sbuf);
StringRef TypeName = GetReceiverInterfaceName(msg);
if (!TypeName.empty())
os << "Argument to '" << TypeName << "' method '";
else
os << "Argument to method '";
os << msg.getSelector().getAsString()
<< "' should be an Objective-C pointer type, not '";
ArgTy.print(os, C.getLangOpts());
os << "'";
BugReport *R = new BugReport(*BT, os.str(), errorNode.getValue());
R->addRange(msg.getArgSourceRange(I));
C.EmitReport(R);
}
}
bool StreamChecker::evalCall(const CallExpr *CE, CheckerContext &C) const {
const FunctionDecl *FD = C.getCalleeDecl(CE);
if (!FD || FD->getKind() != Decl::Function)
return false;
ASTContext &Ctx = C.getASTContext();
if (!II_fopen)
II_fopen = &Ctx.Idents.get("fopen");
if (!II_tmpfile)
II_tmpfile = &Ctx.Idents.get("tmpfile");
if (!II_fclose)
II_fclose = &Ctx.Idents.get("fclose");
if (!II_fread)
II_fread = &Ctx.Idents.get("fread");
if (!II_fwrite)
II_fwrite = &Ctx.Idents.get("fwrite");
if (!II_fseek)
II_fseek = &Ctx.Idents.get("fseek");
if (!II_ftell)
II_ftell = &Ctx.Idents.get("ftell");
if (!II_rewind)
II_rewind = &Ctx.Idents.get("rewind");
if (!II_fgetpos)
II_fgetpos = &Ctx.Idents.get("fgetpos");
if (!II_fsetpos)
II_fsetpos = &Ctx.Idents.get("fsetpos");
if (!II_clearerr)
II_clearerr = &Ctx.Idents.get("clearerr");
if (!II_feof)
II_feof = &Ctx.Idents.get("feof");
if (!II_ferror)
II_ferror = &Ctx.Idents.get("ferror");
if (!II_fileno)
II_fileno = &Ctx.Idents.get("fileno");
if (FD->getIdentifier() == II_fopen) {
Fopen(C, CE);
return true;
}
if (FD->getIdentifier() == II_tmpfile) {
Tmpfile(C, CE);
return true;
}
if (FD->getIdentifier() == II_fclose) {
Fclose(C, CE);
return true;
}
if (FD->getIdentifier() == II_fread) {
Fread(C, CE);
return true;
}
if (FD->getIdentifier() == II_fwrite) {
Fwrite(C, CE);
return true;
}
if (FD->getIdentifier() == II_fseek) {
Fseek(C, CE);
return true;
}
if (FD->getIdentifier() == II_ftell) {
Ftell(C, CE);
return true;
}
if (FD->getIdentifier() == II_rewind) {
Rewind(C, CE);
return true;
}
if (FD->getIdentifier() == II_fgetpos) {
Fgetpos(C, CE);
return true;
}
if (FD->getIdentifier() == II_fsetpos) {
Fsetpos(C, CE);
return true;
}
if (FD->getIdentifier() == II_clearerr) {
Clearerr(C, CE);
return true;
}
if (FD->getIdentifier() == II_feof) {
Feof(C, CE);
return true;
}
if (FD->getIdentifier() == II_ferror) {
Ferror(C, CE);
return true;
}
if (FD->getIdentifier() == II_fileno) {
Fileno(C, CE);
return true;
}
return false;
}
void CFRetainReleaseChecker::checkPreStmt(const CallExpr *CE,
CheckerContext &C) const {
// If the CallExpr doesn't have exactly 1 argument just give up checking.
if (CE->getNumArgs() != 1)
return;
ProgramStateRef state = C.getState();
const FunctionDecl *FD = C.getCalleeDecl(CE);
if (!FD)
return;
if (!BT) {
ASTContext &Ctx = C.getASTContext();
Retain = &Ctx.Idents.get("CFRetain");
Release = &Ctx.Idents.get("CFRelease");
MakeCollectable = &Ctx.Idents.get("CFMakeCollectable");
Autorelease = &Ctx.Idents.get("CFAutorelease");
BT.reset(new APIMisuse(
this, "null passed to CF memory management function"));
}
// Check if we called CFRetain/CFRelease/CFMakeCollectable/CFAutorelease.
const IdentifierInfo *FuncII = FD->getIdentifier();
if (!(FuncII == Retain || FuncII == Release || FuncII == MakeCollectable ||
FuncII == Autorelease))
return;
// FIXME: The rest of this just checks that the argument is non-null.
// It should probably be refactored and combined with NonNullParamChecker.
// Get the argument's value.
const Expr *Arg = CE->getArg(0);
SVal ArgVal = state->getSVal(Arg, C.getLocationContext());
Optional<DefinedSVal> DefArgVal = ArgVal.getAs<DefinedSVal>();
if (!DefArgVal)
return;
// Get a NULL value.
SValBuilder &svalBuilder = C.getSValBuilder();
DefinedSVal zero =
svalBuilder.makeZeroVal(Arg->getType()).castAs<DefinedSVal>();
// Make an expression asserting that they're equal.
DefinedOrUnknownSVal ArgIsNull = svalBuilder.evalEQ(state, zero, *DefArgVal);
// Are they equal?
ProgramStateRef stateTrue, stateFalse;
std::tie(stateTrue, stateFalse) = state->assume(ArgIsNull);
if (stateTrue && !stateFalse) {
ExplodedNode *N = C.generateErrorNode(stateTrue);
if (!N)
return;
const char *description;
if (FuncII == Retain)
description = "Null pointer argument in call to CFRetain";
else if (FuncII == Release)
description = "Null pointer argument in call to CFRelease";
else if (FuncII == MakeCollectable)
description = "Null pointer argument in call to CFMakeCollectable";
else if (FuncII == Autorelease)
description = "Null pointer argument in call to CFAutorelease";
else
llvm_unreachable("impossible case");
auto report = llvm::make_unique<BugReport>(*BT, description, N);
report->addRange(Arg->getSourceRange());
bugreporter::trackNullOrUndefValue(N, Arg, *report);
C.emitReport(std::move(report));
return;
}
// From here on, we know the argument is non-null.
C.addTransition(stateFalse);
}
void CFNumberChecker::checkPreStmt(const CallExpr *CE,
CheckerContext &C) const {
ProgramStateRef state = C.getState();
const FunctionDecl *FD = C.getCalleeDecl(CE);
if (!FD)
return;
ASTContext &Ctx = C.getASTContext();
if (!ICreate) {
ICreate = &Ctx.Idents.get("CFNumberCreate");
IGetValue = &Ctx.Idents.get("CFNumberGetValue");
}
if (!(FD->getIdentifier() == ICreate || FD->getIdentifier() == IGetValue) ||
CE->getNumArgs() != 3)
return;
// Get the value of the "theType" argument.
const LocationContext *LCtx = C.getLocationContext();
SVal TheTypeVal = state->getSVal(CE->getArg(1), LCtx);
// FIXME: We really should allow ranges of valid theType values, and
// bifurcate the state appropriately.
Optional<nonloc::ConcreteInt> V = TheTypeVal.getAs<nonloc::ConcreteInt>();
if (!V)
return;
uint64_t NumberKind = V->getValue().getLimitedValue();
Optional<uint64_t> OptCFNumberSize = GetCFNumberSize(Ctx, NumberKind);
// FIXME: In some cases we can emit an error.
if (!OptCFNumberSize)
return;
uint64_t CFNumberSize = *OptCFNumberSize;
// Look at the value of the integer being passed by reference. Essentially
// we want to catch cases where the value passed in is not equal to the
// size of the type being created.
SVal TheValueExpr = state->getSVal(CE->getArg(2), LCtx);
// FIXME: Eventually we should handle arbitrary locations. We can do this
// by having an enhanced memory model that does low-level typing.
Optional<loc::MemRegionVal> LV = TheValueExpr.getAs<loc::MemRegionVal>();
if (!LV)
return;
const TypedValueRegion* R = dyn_cast<TypedValueRegion>(LV->stripCasts());
if (!R)
return;
QualType T = Ctx.getCanonicalType(R->getValueType());
// FIXME: If the pointee isn't an integer type, should we flag a warning?
// People can do weird stuff with pointers.
if (!T->isIntegralOrEnumerationType())
return;
uint64_t PrimitiveTypeSize = Ctx.getTypeSize(T);
if (PrimitiveTypeSize == CFNumberSize)
return;
// FIXME: We can actually create an abstract "CFNumber" object that has
// the bits initialized to the provided values.
ExplodedNode *N = C.generateNonFatalErrorNode();
if (N) {
SmallString<128> sbuf;
llvm::raw_svector_ostream os(sbuf);
bool isCreate = (FD->getIdentifier() == ICreate);
if (isCreate) {
os << (PrimitiveTypeSize == 8 ? "An " : "A ")
<< PrimitiveTypeSize << "-bit integer is used to initialize a "
<< "CFNumber object that represents "
<< (CFNumberSize == 8 ? "an " : "a ")
<< CFNumberSize << "-bit integer; ";
} else {
os << "A CFNumber object that represents "
<< (CFNumberSize == 8 ? "an " : "a ")
<< CFNumberSize << "-bit integer is used to initialize "
<< (PrimitiveTypeSize == 8 ? "an " : "a ")
<< PrimitiveTypeSize << "-bit integer; ";
}
if (PrimitiveTypeSize < CFNumberSize)
os << (CFNumberSize - PrimitiveTypeSize)
<< " bits of the CFNumber value will "
<< (isCreate ? "be garbage." : "overwrite adjacent storage.");
else
os << (PrimitiveTypeSize - CFNumberSize)
<< " bits of the integer value will be "
<< (isCreate ? "lost." : "garbage.");
if (!BT)
BT.reset(new APIMisuse(this, "Bad use of CFNumber APIs"));
auto report = llvm::make_unique<BugReport>(*BT, os.str(), N);
report->addRange(CE->getArg(2)->getSourceRange());
C.emitReport(std::move(report));
}
}
void NilArgChecker::checkPreObjCMessage(const ObjCMethodCall &msg,
CheckerContext &C) const {
const ObjCInterfaceDecl *ID = msg.getReceiverInterface();
if (!ID)
return;
FoundationClass Class = findKnownClass(ID);
static const unsigned InvalidArgIndex = UINT_MAX;
unsigned Arg = InvalidArgIndex;
bool CanBeSubscript = false;
if (Class == FC_NSString) {
Selector S = msg.getSelector();
if (S.isUnarySelector())
return;
if (StringSelectors.empty()) {
ASTContext &Ctx = C.getASTContext();
Selector Sels[] = {
getKeywordSelector(Ctx, "caseInsensitiveCompare"),
getKeywordSelector(Ctx, "compare"),
getKeywordSelector(Ctx, "compare", "options"),
getKeywordSelector(Ctx, "compare", "options", "range"),
getKeywordSelector(Ctx, "compare", "options", "range", "locale"),
getKeywordSelector(Ctx, "componentsSeparatedByCharactersInSet"),
getKeywordSelector(Ctx, "initWithFormat"),
getKeywordSelector(Ctx, "localizedCaseInsensitiveCompare"),
getKeywordSelector(Ctx, "localizedCompare"),
getKeywordSelector(Ctx, "localizedStandardCompare"),
};
for (Selector KnownSel : Sels)
StringSelectors[KnownSel] = 0;
}
auto I = StringSelectors.find(S);
if (I == StringSelectors.end())
return;
Arg = I->second;
} else if (Class == FC_NSArray) {
Selector S = msg.getSelector();
if (S.isUnarySelector())
return;
if (ArrayWithObjectSel.isNull()) {
ASTContext &Ctx = C.getASTContext();
ArrayWithObjectSel = getKeywordSelector(Ctx, "arrayWithObject");
AddObjectSel = getKeywordSelector(Ctx, "addObject");
InsertObjectAtIndexSel =
getKeywordSelector(Ctx, "insertObject", "atIndex");
ReplaceObjectAtIndexWithObjectSel =
getKeywordSelector(Ctx, "replaceObjectAtIndex", "withObject");
SetObjectAtIndexedSubscriptSel =
getKeywordSelector(Ctx, "setObject", "atIndexedSubscript");
ArrayByAddingObjectSel = getKeywordSelector(Ctx, "arrayByAddingObject");
}
if (S == ArrayWithObjectSel || S == AddObjectSel ||
S == InsertObjectAtIndexSel || S == ArrayByAddingObjectSel) {
Arg = 0;
} else if (S == SetObjectAtIndexedSubscriptSel) {
Arg = 0;
CanBeSubscript = true;
} else if (S == ReplaceObjectAtIndexWithObjectSel) {
Arg = 1;
}
} else if (Class == FC_NSDictionary) {
Selector S = msg.getSelector();
if (S.isUnarySelector())
return;
if (DictionaryWithObjectForKeySel.isNull()) {
ASTContext &Ctx = C.getASTContext();
DictionaryWithObjectForKeySel =
getKeywordSelector(Ctx, "dictionaryWithObject", "forKey");
SetObjectForKeySel = getKeywordSelector(Ctx, "setObject", "forKey");
SetObjectForKeyedSubscriptSel =
getKeywordSelector(Ctx, "setObject", "forKeyedSubscript");
RemoveObjectForKeySel = getKeywordSelector(Ctx, "removeObjectForKey");
}
if (S == DictionaryWithObjectForKeySel || S == SetObjectForKeySel) {
Arg = 0;
warnIfNilArg(C, msg, /* Arg */1, Class);
} else if (S == SetObjectForKeyedSubscriptSel) {
CanBeSubscript = true;
Arg = 1;
} else if (S == RemoveObjectForKeySel) {
Arg = 0;
}
}
// If argument is '0', report a warning.
if ((Arg != InvalidArgIndex))
warnIfNilArg(C, msg, Arg, Class, CanBeSubscript);
}
void UnixAPIChecker::CheckOpen(CheckerContext &C, const CallExpr *CE) const {
// The definition of O_CREAT is platform specific. We need a better way
// of querying this information from the checking environment.
if (!Val_O_CREAT.hasValue()) {
if (C.getASTContext().getTargetInfo().getTriple().getVendor()
== llvm::Triple::Apple)
Val_O_CREAT = 0x0200;
else {
// FIXME: We need a more general way of getting the O_CREAT value.
// We could possibly grovel through the preprocessor state, but
// that would require passing the Preprocessor object to the ExprEngine.
// See also: MallocChecker.cpp / M_ZERO.
return;
}
}
// Look at the 'oflags' argument for the O_CREAT flag.
ProgramStateRef state = C.getState();
if (CE->getNumArgs() < 2) {
// The frontend should issue a warning for this case, so this is a sanity
// check.
return;
}
// Now check if oflags has O_CREAT set.
const Expr *oflagsEx = CE->getArg(1);
const SVal V = state->getSVal(oflagsEx, C.getLocationContext());
if (!V.getAs<NonLoc>()) {
// The case where 'V' can be a location can only be due to a bad header,
// so in this case bail out.
return;
}
NonLoc oflags = V.castAs<NonLoc>();
NonLoc ocreateFlag = C.getSValBuilder()
.makeIntVal(Val_O_CREAT.getValue(), oflagsEx->getType()).castAs<NonLoc>();
SVal maskedFlagsUC = C.getSValBuilder().evalBinOpNN(state, BO_And,
oflags, ocreateFlag,
oflagsEx->getType());
if (maskedFlagsUC.isUnknownOrUndef())
return;
DefinedSVal maskedFlags = maskedFlagsUC.castAs<DefinedSVal>();
// Check if maskedFlags is non-zero.
ProgramStateRef trueState, falseState;
std::tie(trueState, falseState) = state->assume(maskedFlags);
// Only emit an error if the value of 'maskedFlags' is properly
// constrained;
if (!(trueState && !falseState))
return;
if (CE->getNumArgs() < 3) {
ExplodedNode *N = C.generateSink(trueState);
if (!N)
return;
LazyInitialize(BT_open, "Improper use of 'open'");
BugReport *report =
new BugReport(*BT_open,
"Call to 'open' requires a third argument when "
"the 'O_CREAT' flag is set", N);
report->addRange(oflagsEx->getSourceRange());
C.emitReport(report);
}
}
