[analyzer] Add a debug checker to test for tainted data.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@145827 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/StaticAnalyzer/Checkers/TaintTesterChecker.cpp b/lib/StaticAnalyzer/Checkers/TaintTesterChecker.cpp
new file mode 100644
index 0000000..0819e86
--- /dev/null
+++ b/lib/StaticAnalyzer/Checkers/TaintTesterChecker.cpp
@@ -0,0 +1,62 @@
+//== TaintTesterChecker.cpp ----------------------------------- -*- C++ -*--=//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This checker can be used for testing how taint data is propagated.
+//
+//===----------------------------------------------------------------------===//
+#include "ClangSACheckers.h"
+#include "clang/StaticAnalyzer/Core/Checker.h"
+#include "clang/StaticAnalyzer/Core/CheckerManager.h"
+#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
+#include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
+
+using namespace clang;
+using namespace ento;
+
+namespace {
+class TaintTesterChecker : public Checker< check::PostStmt<Expr> > {
+
+ mutable llvm::OwningPtr<BugType> BT;
+ void initBugType() const;
+
+ /// Given a pointer argument, get the symbol of the value it contains
+ /// (points to).
+ SymbolRef getPointedToSymbol(CheckerContext &C,
+ const Expr* Arg,
+ bool IssueWarning = true) const;
+
+public:
+ void checkPostStmt(const Expr *E, CheckerContext &C) const;
+};
+}
+
+inline void TaintTesterChecker::initBugType() const {
+ if (!BT)
+ BT.reset(new BugType("Tainted data", "General"));
+}
+
+void TaintTesterChecker::checkPostStmt(const Expr *E,
+ CheckerContext &C) const {
+ const ProgramState *State = C.getState();
+ if (!State)
+ return;
+
+ if (E && State->isTainted(E)) {
+ if (ExplodedNode *N = C.addTransition()) {
+ initBugType();
+ BugReport *report = new BugReport(*BT, "tainted",N);
+ report->addRange(E->getSourceRange());
+ C.EmitReport(report);
+ }
+ }
+}
+
+void ento::registerTaintTesterChecker(CheckerManager &mgr) {
+ mgr.registerChecker<TaintTesterChecker>();
+}