clang  8.0.0svn
MacOSKeychainAPIChecker.cpp
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1 //==--- MacOSKeychainAPIChecker.cpp ------------------------------*- C++ -*-==//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 // This checker flags misuses of KeyChainAPI. In particular, the password data
10 // allocated/returned by SecKeychainItemCopyContent,
11 // SecKeychainFindGenericPassword, SecKeychainFindInternetPassword functions has
12 // to be freed using a call to SecKeychainItemFreeContent.
13 //===----------------------------------------------------------------------===//
14 
15 #include "ClangSACheckers.h"
22 #include "llvm/ADT/SmallString.h"
23 #include "llvm/Support/raw_ostream.h"
24 
25 using namespace clang;
26 using namespace ento;
27 
28 namespace {
29 class MacOSKeychainAPIChecker : public Checker<check::PreStmt<CallExpr>,
30  check::PostStmt<CallExpr>,
31  check::DeadSymbols,
32  eval::Assume> {
33  mutable std::unique_ptr<BugType> BT;
34 
35 public:
36  /// AllocationState is a part of the checker specific state together with the
37  /// MemRegion corresponding to the allocated data.
38  struct AllocationState {
39  /// The index of the allocator function.
40  unsigned int AllocatorIdx;
41  SymbolRef Region;
42 
43  AllocationState(const Expr *E, unsigned int Idx, SymbolRef R) :
44  AllocatorIdx(Idx),
45  Region(R) {}
46 
47  bool operator==(const AllocationState &X) const {
48  return (AllocatorIdx == X.AllocatorIdx &&
49  Region == X.Region);
50  }
51 
52  void Profile(llvm::FoldingSetNodeID &ID) const {
53  ID.AddInteger(AllocatorIdx);
54  ID.AddPointer(Region);
55  }
56  };
57 
58  void checkPreStmt(const CallExpr *S, CheckerContext &C) const;
59  void checkPostStmt(const CallExpr *S, CheckerContext &C) const;
60  void checkDeadSymbols(SymbolReaper &SR, CheckerContext &C) const;
61  ProgramStateRef evalAssume(ProgramStateRef state, SVal Cond,
62  bool Assumption) const;
63  void printState(raw_ostream &Out, ProgramStateRef State,
64  const char *NL, const char *Sep) const;
65 
66 private:
67  typedef std::pair<SymbolRef, const AllocationState*> AllocationPair;
68  typedef SmallVector<AllocationPair, 2> AllocationPairVec;
69 
70  enum APIKind {
71  /// Denotes functions tracked by this checker.
72  ValidAPI = 0,
73  /// The functions commonly/mistakenly used in place of the given API.
74  ErrorAPI = 1,
75  /// The functions which may allocate the data. These are tracked to reduce
76  /// the false alarm rate.
77  PossibleAPI = 2
78  };
79  /// Stores the information about the allocator and deallocator functions -
80  /// these are the functions the checker is tracking.
81  struct ADFunctionInfo {
82  const char* Name;
83  unsigned int Param;
84  unsigned int DeallocatorIdx;
85  APIKind Kind;
86  };
87  static const unsigned InvalidIdx = 100000;
88  static const unsigned FunctionsToTrackSize = 8;
89  static const ADFunctionInfo FunctionsToTrack[FunctionsToTrackSize];
90  /// The value, which represents no error return value for allocator functions.
91  static const unsigned NoErr = 0;
92 
93  /// Given the function name, returns the index of the allocator/deallocator
94  /// function.
95  static unsigned getTrackedFunctionIndex(StringRef Name, bool IsAllocator);
96 
97  inline void initBugType() const {
98  if (!BT)
99  BT.reset(new BugType(this, "Improper use of SecKeychain API",
100  "API Misuse (Apple)"));
101  }
102 
103  void generateDeallocatorMismatchReport(const AllocationPair &AP,
104  const Expr *ArgExpr,
105  CheckerContext &C) const;
106 
107  /// Find the allocation site for Sym on the path leading to the node N.
108  const ExplodedNode *getAllocationNode(const ExplodedNode *N, SymbolRef Sym,
109  CheckerContext &C) const;
110 
111  std::unique_ptr<BugReport> generateAllocatedDataNotReleasedReport(
112  const AllocationPair &AP, ExplodedNode *N, CheckerContext &C) const;
113 
114  /// Mark an AllocationPair interesting for diagnostic reporting.
115  void markInteresting(BugReport *R, const AllocationPair &AP) const {
116  R->markInteresting(AP.first);
117  R->markInteresting(AP.second->Region);
118  }
119 
120  /// The bug visitor which allows us to print extra diagnostics along the
121  /// BugReport path. For example, showing the allocation site of the leaked
122  /// region.
123  class SecKeychainBugVisitor : public BugReporterVisitor {
124  protected:
125  // The allocated region symbol tracked by the main analysis.
126  SymbolRef Sym;
127 
128  public:
129  SecKeychainBugVisitor(SymbolRef S) : Sym(S) {}
130 
131  void Profile(llvm::FoldingSetNodeID &ID) const override {
132  static int X = 0;
133  ID.AddPointer(&X);
134  ID.AddPointer(Sym);
135  }
136 
137  std::shared_ptr<PathDiagnosticPiece> VisitNode(const ExplodedNode *N,
138  BugReporterContext &BRC,
139  BugReport &BR) override;
140  };
141 };
142 }
143 
144 /// ProgramState traits to store the currently allocated (and not yet freed)
145 /// symbols. This is a map from the allocated content symbol to the
146 /// corresponding AllocationState.
148  SymbolRef,
149  MacOSKeychainAPIChecker::AllocationState)
150 
151 static bool isEnclosingFunctionParam(const Expr *E) {
152  E = E->IgnoreParenCasts();
153  if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
154  const ValueDecl *VD = DRE->getDecl();
155  if (isa<ImplicitParamDecl>(VD) || isa<ParmVarDecl>(VD))
156  return true;
157  }
158  return false;
159 }
160 
161 const MacOSKeychainAPIChecker::ADFunctionInfo
162  MacOSKeychainAPIChecker::FunctionsToTrack[FunctionsToTrackSize] = {
163  {"SecKeychainItemCopyContent", 4, 3, ValidAPI}, // 0
164  {"SecKeychainFindGenericPassword", 6, 3, ValidAPI}, // 1
165  {"SecKeychainFindInternetPassword", 13, 3, ValidAPI}, // 2
166  {"SecKeychainItemFreeContent", 1, InvalidIdx, ValidAPI}, // 3
167  {"SecKeychainItemCopyAttributesAndData", 5, 5, ValidAPI}, // 4
168  {"SecKeychainItemFreeAttributesAndData", 1, InvalidIdx, ValidAPI}, // 5
169  {"free", 0, InvalidIdx, ErrorAPI}, // 6
170  {"CFStringCreateWithBytesNoCopy", 1, InvalidIdx, PossibleAPI}, // 7
171 };
172 
173 unsigned MacOSKeychainAPIChecker::getTrackedFunctionIndex(StringRef Name,
174  bool IsAllocator) {
175  for (unsigned I = 0; I < FunctionsToTrackSize; ++I) {
176  ADFunctionInfo FI = FunctionsToTrack[I];
177  if (FI.Name != Name)
178  continue;
179  // Make sure the function is of the right type (allocator vs deallocator).
180  if (IsAllocator && (FI.DeallocatorIdx == InvalidIdx))
181  return InvalidIdx;
182  if (!IsAllocator && (FI.DeallocatorIdx != InvalidIdx))
183  return InvalidIdx;
184 
185  return I;
186  }
187  // The function is not tracked.
188  return InvalidIdx;
189 }
190 
191 static bool isBadDeallocationArgument(const MemRegion *Arg) {
192  if (!Arg)
193  return false;
194  return isa<AllocaRegion>(Arg) || isa<BlockDataRegion>(Arg) ||
195  isa<TypedRegion>(Arg);
196 }
197 
198 /// Given the address expression, retrieve the value it's pointing to. Assume
199 /// that value is itself an address, and return the corresponding symbol.
201  CheckerContext &C) {
202  ProgramStateRef State = C.getState();
203  SVal ArgV = C.getSVal(Expr);
204 
205  if (Optional<loc::MemRegionVal> X = ArgV.getAs<loc::MemRegionVal>()) {
206  StoreManager& SM = C.getStoreManager();
207  SymbolRef sym = SM.getBinding(State->getStore(), *X).getAsLocSymbol();
208  if (sym)
209  return sym;
210  }
211  return nullptr;
212 }
213 
214 // Report deallocator mismatch. Remove the region from tracking - reporting a
215 // missing free error after this one is redundant.
216 void MacOSKeychainAPIChecker::
217  generateDeallocatorMismatchReport(const AllocationPair &AP,
218  const Expr *ArgExpr,
219  CheckerContext &C) const {
220  ProgramStateRef State = C.getState();
221  State = State->remove<AllocatedData>(AP.first);
222  ExplodedNode *N = C.generateNonFatalErrorNode(State);
223 
224  if (!N)
225  return;
226  initBugType();
227  SmallString<80> sbuf;
228  llvm::raw_svector_ostream os(sbuf);
229  unsigned int PDeallocIdx =
230  FunctionsToTrack[AP.second->AllocatorIdx].DeallocatorIdx;
231 
232  os << "Deallocator doesn't match the allocator: '"
233  << FunctionsToTrack[PDeallocIdx].Name << "' should be used.";
234  auto Report = llvm::make_unique<BugReport>(*BT, os.str(), N);
235  Report->addVisitor(llvm::make_unique<SecKeychainBugVisitor>(AP.first));
236  Report->addRange(ArgExpr->getSourceRange());
237  markInteresting(Report.get(), AP);
238  C.emitReport(std::move(Report));
239 }
240 
241 void MacOSKeychainAPIChecker::checkPreStmt(const CallExpr *CE,
242  CheckerContext &C) const {
243  unsigned idx = InvalidIdx;
244  ProgramStateRef State = C.getState();
245 
246  const FunctionDecl *FD = C.getCalleeDecl(CE);
247  if (!FD || FD->getKind() != Decl::Function)
248  return;
249 
250  StringRef funName = C.getCalleeName(FD);
251  if (funName.empty())
252  return;
253 
254  // If it is a call to an allocator function, it could be a double allocation.
255  idx = getTrackedFunctionIndex(funName, true);
256  if (idx != InvalidIdx) {
257  unsigned paramIdx = FunctionsToTrack[idx].Param;
258  if (CE->getNumArgs() <= paramIdx)
259  return;
260 
261  const Expr *ArgExpr = CE->getArg(paramIdx);
262  if (SymbolRef V = getAsPointeeSymbol(ArgExpr, C))
263  if (const AllocationState *AS = State->get<AllocatedData>(V)) {
264  // Remove the value from the state. The new symbol will be added for
265  // tracking when the second allocator is processed in checkPostStmt().
266  State = State->remove<AllocatedData>(V);
267  ExplodedNode *N = C.generateNonFatalErrorNode(State);
268  if (!N)
269  return;
270  initBugType();
271  SmallString<128> sbuf;
272  llvm::raw_svector_ostream os(sbuf);
273  unsigned int DIdx = FunctionsToTrack[AS->AllocatorIdx].DeallocatorIdx;
274  os << "Allocated data should be released before another call to "
275  << "the allocator: missing a call to '"
276  << FunctionsToTrack[DIdx].Name
277  << "'.";
278  auto Report = llvm::make_unique<BugReport>(*BT, os.str(), N);
279  Report->addVisitor(llvm::make_unique<SecKeychainBugVisitor>(V));
280  Report->addRange(ArgExpr->getSourceRange());
281  Report->markInteresting(AS->Region);
282  C.emitReport(std::move(Report));
283  }
284  return;
285  }
286 
287  // Is it a call to one of deallocator functions?
288  idx = getTrackedFunctionIndex(funName, false);
289  if (idx == InvalidIdx)
290  return;
291 
292  unsigned paramIdx = FunctionsToTrack[idx].Param;
293  if (CE->getNumArgs() <= paramIdx)
294  return;
295 
296  // Check the argument to the deallocator.
297  const Expr *ArgExpr = CE->getArg(paramIdx);
298  SVal ArgSVal = C.getSVal(ArgExpr);
299 
300  // Undef is reported by another checker.
301  if (ArgSVal.isUndef())
302  return;
303 
304  SymbolRef ArgSM = ArgSVal.getAsLocSymbol();
305 
306  // If the argument is coming from the heap, globals, or unknown, do not
307  // report it.
308  bool RegionArgIsBad = false;
309  if (!ArgSM) {
310  if (!isBadDeallocationArgument(ArgSVal.getAsRegion()))
311  return;
312  RegionArgIsBad = true;
313  }
314 
315  // Is the argument to the call being tracked?
316  const AllocationState *AS = State->get<AllocatedData>(ArgSM);
317  if (!AS)
318  return;
319 
320  // TODO: We might want to report double free here.
321  // (that would involve tracking all the freed symbols in the checker state).
322  if (RegionArgIsBad) {
323  // It is possible that this is a false positive - the argument might
324  // have entered as an enclosing function parameter.
325  if (isEnclosingFunctionParam(ArgExpr))
326  return;
327 
328  ExplodedNode *N = C.generateNonFatalErrorNode(State);
329  if (!N)
330  return;
331  initBugType();
332  auto Report = llvm::make_unique<BugReport>(
333  *BT, "Trying to free data which has not been allocated.", N);
334  Report->addRange(ArgExpr->getSourceRange());
335  if (AS)
336  Report->markInteresting(AS->Region);
337  C.emitReport(std::move(Report));
338  return;
339  }
340 
341  // Process functions which might deallocate.
342  if (FunctionsToTrack[idx].Kind == PossibleAPI) {
343 
344  if (funName == "CFStringCreateWithBytesNoCopy") {
345  const Expr *DeallocatorExpr = CE->getArg(5)->IgnoreParenCasts();
346  // NULL ~ default deallocator, so warn.
347  if (DeallocatorExpr->isNullPointerConstant(C.getASTContext(),
349  const AllocationPair AP = std::make_pair(ArgSM, AS);
350  generateDeallocatorMismatchReport(AP, ArgExpr, C);
351  return;
352  }
353  // One of the default allocators, so warn.
354  if (const DeclRefExpr *DE = dyn_cast<DeclRefExpr>(DeallocatorExpr)) {
355  StringRef DeallocatorName = DE->getFoundDecl()->getName();
356  if (DeallocatorName == "kCFAllocatorDefault" ||
357  DeallocatorName == "kCFAllocatorSystemDefault" ||
358  DeallocatorName == "kCFAllocatorMalloc") {
359  const AllocationPair AP = std::make_pair(ArgSM, AS);
360  generateDeallocatorMismatchReport(AP, ArgExpr, C);
361  return;
362  }
363  // If kCFAllocatorNull, which does not deallocate, we still have to
364  // find the deallocator.
365  if (DE->getFoundDecl()->getName() == "kCFAllocatorNull")
366  return;
367  }
368  // In all other cases, assume the user supplied a correct deallocator
369  // that will free memory so stop tracking.
370  State = State->remove<AllocatedData>(ArgSM);
371  C.addTransition(State);
372  return;
373  }
374 
375  llvm_unreachable("We know of no other possible APIs.");
376  }
377 
378  // The call is deallocating a value we previously allocated, so remove it
379  // from the next state.
380  State = State->remove<AllocatedData>(ArgSM);
381 
382  // Check if the proper deallocator is used.
383  unsigned int PDeallocIdx = FunctionsToTrack[AS->AllocatorIdx].DeallocatorIdx;
384  if (PDeallocIdx != idx || (FunctionsToTrack[idx].Kind == ErrorAPI)) {
385  const AllocationPair AP = std::make_pair(ArgSM, AS);
386  generateDeallocatorMismatchReport(AP, ArgExpr, C);
387  return;
388  }
389 
390  C.addTransition(State);
391 }
392 
393 void MacOSKeychainAPIChecker::checkPostStmt(const CallExpr *CE,
394  CheckerContext &C) const {
395  ProgramStateRef State = C.getState();
396  const FunctionDecl *FD = C.getCalleeDecl(CE);
397  if (!FD || FD->getKind() != Decl::Function)
398  return;
399 
400  StringRef funName = C.getCalleeName(FD);
401 
402  // If a value has been allocated, add it to the set for tracking.
403  unsigned idx = getTrackedFunctionIndex(funName, true);
404  if (idx == InvalidIdx)
405  return;
406 
407  const Expr *ArgExpr = CE->getArg(FunctionsToTrack[idx].Param);
408  // If the argument entered as an enclosing function parameter, skip it to
409  // avoid false positives.
410  if (isEnclosingFunctionParam(ArgExpr) &&
411  C.getLocationContext()->getParent() == nullptr)
412  return;
413 
414  if (SymbolRef V = getAsPointeeSymbol(ArgExpr, C)) {
415  // If the argument points to something that's not a symbolic region, it
416  // can be:
417  // - unknown (cannot reason about it)
418  // - undefined (already reported by other checker)
419  // - constant (null - should not be tracked,
420  // other constant will generate a compiler warning)
421  // - goto (should be reported by other checker)
422 
423  // The call return value symbol should stay alive for as long as the
424  // allocated value symbol, since our diagnostics depend on the value
425  // returned by the call. Ex: Data should only be freed if noErr was
426  // returned during allocation.)
427  SymbolRef RetStatusSymbol = C.getSVal(CE).getAsSymbol();
428  C.getSymbolManager().addSymbolDependency(V, RetStatusSymbol);
429 
430  // Track the allocated value in the checker state.
431  State = State->set<AllocatedData>(V, AllocationState(ArgExpr, idx,
432  RetStatusSymbol));
433  assert(State);
434  C.addTransition(State);
435  }
436 }
437 
438 // TODO: This logic is the same as in Malloc checker.
439 const ExplodedNode *
440 MacOSKeychainAPIChecker::getAllocationNode(const ExplodedNode *N,
441  SymbolRef Sym,
442  CheckerContext &C) const {
443  const LocationContext *LeakContext = N->getLocationContext();
444  // Walk the ExplodedGraph backwards and find the first node that referred to
445  // the tracked symbol.
446  const ExplodedNode *AllocNode = N;
447 
448  while (N) {
449  if (!N->getState()->get<AllocatedData>(Sym))
450  break;
451  // Allocation node, is the last node in the current or parent context in
452  // which the symbol was tracked.
453  const LocationContext *NContext = N->getLocationContext();
454  if (NContext == LeakContext ||
455  NContext->isParentOf(LeakContext))
456  AllocNode = N;
457  N = N->pred_empty() ? nullptr : *(N->pred_begin());
458  }
459 
460  return AllocNode;
461 }
462 
463 std::unique_ptr<BugReport>
464 MacOSKeychainAPIChecker::generateAllocatedDataNotReleasedReport(
465  const AllocationPair &AP, ExplodedNode *N, CheckerContext &C) const {
466  const ADFunctionInfo &FI = FunctionsToTrack[AP.second->AllocatorIdx];
467  initBugType();
468  SmallString<70> sbuf;
469  llvm::raw_svector_ostream os(sbuf);
470  os << "Allocated data is not released: missing a call to '"
471  << FunctionsToTrack[FI.DeallocatorIdx].Name << "'.";
472 
473  // Most bug reports are cached at the location where they occurred.
474  // With leaks, we want to unique them by the location where they were
475  // allocated, and only report a single path.
476  PathDiagnosticLocation LocUsedForUniqueing;
477  const ExplodedNode *AllocNode = getAllocationNode(N, AP.first, C);
478  const Stmt *AllocStmt = PathDiagnosticLocation::getStmt(AllocNode);
479 
480  if (AllocStmt)
481  LocUsedForUniqueing = PathDiagnosticLocation::createBegin(AllocStmt,
482  C.getSourceManager(),
483  AllocNode->getLocationContext());
484 
485  auto Report =
486  llvm::make_unique<BugReport>(*BT, os.str(), N, LocUsedForUniqueing,
487  AllocNode->getLocationContext()->getDecl());
488 
489  Report->addVisitor(llvm::make_unique<SecKeychainBugVisitor>(AP.first));
490  markInteresting(Report.get(), AP);
491  return Report;
492 }
493 
494 /// If the return symbol is assumed to be error, remove the allocated info
495 /// from consideration.
496 ProgramStateRef MacOSKeychainAPIChecker::evalAssume(ProgramStateRef State,
497  SVal Cond,
498  bool Assumption) const {
499  AllocatedDataTy AMap = State->get<AllocatedData>();
500  if (AMap.isEmpty())
501  return State;
502 
503  auto *CondBSE = dyn_cast_or_null<BinarySymExpr>(Cond.getAsSymExpr());
504  if (!CondBSE)
505  return State;
506  BinaryOperator::Opcode OpCode = CondBSE->getOpcode();
507  if (OpCode != BO_EQ && OpCode != BO_NE)
508  return State;
509 
510  // Match for a restricted set of patterns for cmparison of error codes.
511  // Note, the comparisons of type '0 == st' are transformed into SymIntExpr.
512  SymbolRef ReturnSymbol = nullptr;
513  if (auto *SIE = dyn_cast<SymIntExpr>(CondBSE)) {
514  const llvm::APInt &RHS = SIE->getRHS();
515  bool ErrorIsReturned = (OpCode == BO_EQ && RHS != NoErr) ||
516  (OpCode == BO_NE && RHS == NoErr);
517  if (!Assumption)
518  ErrorIsReturned = !ErrorIsReturned;
519  if (ErrorIsReturned)
520  ReturnSymbol = SIE->getLHS();
521  }
522 
523  if (ReturnSymbol)
524  for (auto I = AMap.begin(), E = AMap.end(); I != E; ++I) {
525  if (ReturnSymbol == I->second.Region)
526  State = State->remove<AllocatedData>(I->first);
527  }
528 
529  return State;
530 }
531 
532 void MacOSKeychainAPIChecker::checkDeadSymbols(SymbolReaper &SR,
533  CheckerContext &C) const {
534  ProgramStateRef State = C.getState();
535  AllocatedDataTy AMap = State->get<AllocatedData>();
536  if (AMap.isEmpty())
537  return;
538 
539  bool Changed = false;
540  AllocationPairVec Errors;
541  for (auto I = AMap.begin(), E = AMap.end(); I != E; ++I) {
542  if (!SR.isDead(I->first))
543  continue;
544 
545  Changed = true;
546  State = State->remove<AllocatedData>(I->first);
547  // If the allocated symbol is null do not report.
548  ConstraintManager &CMgr = State->getConstraintManager();
549  ConditionTruthVal AllocFailed = CMgr.isNull(State, I.getKey());
550  if (AllocFailed.isConstrainedTrue())
551  continue;
552  Errors.push_back(std::make_pair(I->first, &I->second));
553  }
554  if (!Changed) {
555  // Generate the new, cleaned up state.
556  C.addTransition(State);
557  return;
558  }
559 
560  static CheckerProgramPointTag Tag(this, "DeadSymbolsLeak");
561  ExplodedNode *N = C.generateNonFatalErrorNode(C.getState(), &Tag);
562  if (!N)
563  return;
564 
565  // Generate the error reports.
566  for (const auto &P : Errors)
567  C.emitReport(generateAllocatedDataNotReleasedReport(P, N, C));
568 
569  // Generate the new, cleaned up state.
570  C.addTransition(State, N);
571 }
572 
573 std::shared_ptr<PathDiagnosticPiece>
574 MacOSKeychainAPIChecker::SecKeychainBugVisitor::VisitNode(
575  const ExplodedNode *N, BugReporterContext &BRC, BugReport &BR) {
576  const AllocationState *AS = N->getState()->get<AllocatedData>(Sym);
577  if (!AS)
578  return nullptr;
579  const AllocationState *ASPrev =
580  N->getFirstPred()->getState()->get<AllocatedData>(Sym);
581  if (ASPrev)
582  return nullptr;
583 
584  // (!ASPrev && AS) ~ We started tracking symbol in node N, it must be the
585  // allocation site.
586  const CallExpr *CE =
587  cast<CallExpr>(N->getLocation().castAs<StmtPoint>().getStmt());
588  const FunctionDecl *funDecl = CE->getDirectCallee();
589  assert(funDecl && "We do not support indirect function calls as of now.");
590  StringRef funName = funDecl->getName();
591 
592  // Get the expression of the corresponding argument.
593  unsigned Idx = getTrackedFunctionIndex(funName, true);
594  assert(Idx != InvalidIdx && "This should be a call to an allocator.");
595  const Expr *ArgExpr = CE->getArg(FunctionsToTrack[Idx].Param);
596  PathDiagnosticLocation Pos(ArgExpr, BRC.getSourceManager(),
597  N->getLocationContext());
598  return std::make_shared<PathDiagnosticEventPiece>(Pos,
599  "Data is allocated here.");
600 }
601 
602 void MacOSKeychainAPIChecker::printState(raw_ostream &Out,
603  ProgramStateRef State,
604  const char *NL,
605  const char *Sep) const {
606 
607  AllocatedDataTy AMap = State->get<AllocatedData>();
608 
609  if (!AMap.isEmpty()) {
610  Out << Sep << "KeychainAPIChecker :" << NL;
611  for (auto I = AMap.begin(), E = AMap.end(); I != E; ++I) {
612  I.getKey()->dumpToStream(Out);
613  }
614  }
615 }
616 
617 
618 void ento::registerMacOSKeychainAPIChecker(CheckerManager &mgr) {
619  mgr.registerChecker<MacOSKeychainAPIChecker>();
620 }
Represents a function declaration or definition.
Definition: Decl.h:1732
Expr * getArg(unsigned Arg)
getArg - Return the specified argument.
Definition: Expr.h:2474
bool operator==(CanQual< T > x, CanQual< U > y)
const SymExpr * SymbolRef
Stmt - This represents one statement.
Definition: Stmt.h:66
unsigned getNumArgs() const
getNumArgs - Return the number of actual arguments to this call.
Definition: Expr.h:2462
IntrusiveRefCntPtr< const ProgramState > ProgramStateRef
StringRef P
constexpr XRayInstrMask Function
Definition: XRayInstr.h:39
bool isParentOf(const LocationContext *LC) const
static SymbolRef getAsPointeeSymbol(const Expr *Expr, CheckerContext &C)
Given the address expression, retrieve the value it&#39;s pointing to.
LineState State
i32 captured_struct **param SharedsTy A type which contains references the shared variables *param Shareds Context with the list of shared variables from the p *TaskFunction *param Data Additional data for task generation like final * state
BinaryOperatorKind
Expr * IgnoreParenCasts() LLVM_READONLY
IgnoreParenCasts - Ignore parentheses and casts.
Definition: Expr.cpp:2579
Represent the declaration of a variable (in which case it is an lvalue) a function (in which case it ...
Definition: Decl.h:636
This represents one expression.
Definition: Expr.h:106
const SourceManager & SM
Definition: Format.cpp:1490
static const Stmt * getStmt(const ExplodedNode *N)
Given an exploded node, retrieve the statement that should be used for the diagnostic location...
static PathDiagnosticLocation createBegin(const Decl *D, const SourceManager &SM)
Create a location for the beginning of the declaration.
static bool isBadDeallocationArgument(const MemRegion *Arg)
Kind
NullPointerConstantKind isNullPointerConstant(ASTContext &Ctx, NullPointerConstantValueDependence NPC) const
isNullPointerConstant - C99 6.3.2.3p3 - Test if this reduces down to a Null pointer constant...
Definition: Expr.cpp:3420
Specifies that a value-dependent expression should be considered to never be a null pointer constant...
Definition: Expr.h:718
REGISTER_MAP_WITH_PROGRAMSTATE(AllocatedData, SymbolRef, MacOSKeychainAPIChecker::AllocationState) static bool isEnclosingFunctionParam(const Expr *E)
ProgramState traits to store the currently allocated (and not yet freed) symbols. ...
Dataflow Directional Tag Classes.
FunctionDecl * getDirectCallee()
If the callee is a FunctionDecl, return it. Otherwise return 0.
Definition: Expr.cpp:1279
Kind getKind() const
Definition: DeclBase.h:421
X
Add a minimal nested name specifier fixit hint to allow lookup of a tag name from an outer enclosing ...
Definition: SemaDecl.cpp:13853
SourceRange getSourceRange() const LLVM_READONLY
SourceLocation tokens are not useful in isolation - they are low level value objects created/interpre...
Definition: Stmt.cpp:268
CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]).
Definition: Expr.h:2405
A reference to a declared variable, function, enum, etc.
Definition: Expr.h:1036