From 222e2a7620e6520ffaf4fc4e69d79c18da31542e Mon Sep 17 00:00:00 2001
From: "Zancanaro; Carlo" <czan8762@plang3.cs.usyd.edu.au>
Date: Mon, 24 Sep 2012 09:58:17 +1000
Subject: Add the clang library to the repo (with some of my changes, too).

---
 .../Checkers/FixedAddressChecker.cpp               | 67 ++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 clang/lib/StaticAnalyzer/Checkers/FixedAddressChecker.cpp

(limited to 'clang/lib/StaticAnalyzer/Checkers/FixedAddressChecker.cpp')

diff --git a/clang/lib/StaticAnalyzer/Checkers/FixedAddressChecker.cpp b/clang/lib/StaticAnalyzer/Checkers/FixedAddressChecker.cpp
new file mode 100644
index 0000000..a1f2f3b
--- /dev/null
+++ b/clang/lib/StaticAnalyzer/Checkers/FixedAddressChecker.cpp
@@ -0,0 +1,67 @@
+//=== FixedAddressChecker.cpp - Fixed address usage checker ----*- C++ -*--===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This files defines FixedAddressChecker, a builtin checker that checks for
+// assignment of a fixed address to a pointer.
+// This check corresponds to CWE-587.
+//
+//===----------------------------------------------------------------------===//
+
+#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 FixedAddressChecker 
+  : public Checker< check::PreStmt<BinaryOperator> > {
+  mutable OwningPtr<BuiltinBug> BT;
+
+public:
+  void checkPreStmt(const BinaryOperator *B, CheckerContext &C) const;
+};
+}
+
+void FixedAddressChecker::checkPreStmt(const BinaryOperator *B,
+                                       CheckerContext &C) const {
+  // Using a fixed address is not portable because that address will probably
+  // not be valid in all environments or platforms.
+
+  if (B->getOpcode() != BO_Assign)
+    return;
+
+  QualType T = B->getType();
+  if (!T->isPointerType())
+    return;
+
+  ProgramStateRef state = C.getState();
+  SVal RV = state->getSVal(B->getRHS(), C.getLocationContext());
+
+  if (!RV.isConstant() || RV.isZeroConstant())
+    return;
+
+  if (ExplodedNode *N = C.addTransition()) {
+    if (!BT)
+      BT.reset(new BuiltinBug("Use fixed address", 
+                          "Using a fixed address is not portable because that "
+                          "address will probably not be valid in all "
+                          "environments or platforms."));
+    BugReport *R = new BugReport(*BT, BT->getDescription(), N);
+    R->addRange(B->getRHS()->getSourceRange());
+    C.EmitReport(R);
+  }
+}
+
+void ento::registerFixedAddressChecker(CheckerManager &mgr) {
+  mgr.registerChecker<FixedAddressChecker>();
+}
-- 
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