diff --git a/lib/Checker/CheckSecuritySyntaxOnly.cpp b/lib/Checker/CheckSecuritySyntaxOnly.cpp
new file mode 100644
index 0000000..923baf5
--- /dev/null
+++ b/lib/Checker/CheckSecuritySyntaxOnly.cpp
@@ -0,0 +1,502 @@
+//==- CheckSecuritySyntaxOnly.cpp - Basic security checks --------*- C++ -*-==//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file defines a set of flow-insensitive security checks.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Basic/TargetInfo.h"
+#include "clang/Checker/BugReporter/BugReporter.h"
+#include "clang/Checker/Checkers/LocalCheckers.h"
+#include "clang/AST/StmtVisitor.h"
+#include "llvm/Support/raw_ostream.h"
+
+using namespace clang;
+
+static bool isArc4RandomAvailable(const ASTContext &Ctx) {
+  const llvm::Triple &T = Ctx.Target.getTriple();
+  return T.getVendor() == llvm::Triple::Apple ||
+         T.getOS() == llvm::Triple::FreeBSD;
+}
+
+namespace {
+class WalkAST : public StmtVisitor<WalkAST> {
+  BugReporter &BR;
+  IdentifierInfo *II_gets;
+  IdentifierInfo *II_getpw;
+  IdentifierInfo *II_mktemp;
+  enum { num_rands = 9 };
+  IdentifierInfo *II_rand[num_rands];
+  IdentifierInfo *II_random;
+  enum { num_setids = 6 };
+  IdentifierInfo *II_setid[num_setids];
+  
+  const bool CheckRand;
+
+public:
+  WalkAST(BugReporter &br) : BR(br),
+			     II_gets(0), II_getpw(0), II_mktemp(0),
+			     II_rand(), II_random(0), II_setid(),
+                 CheckRand(isArc4RandomAvailable(BR.getContext())) {}
+
+  // Statement visitor methods.
+  void VisitCallExpr(CallExpr *CE);
+  void VisitForStmt(ForStmt *S);
+  void VisitCompoundStmt (CompoundStmt *S);
+  void VisitStmt(Stmt *S) { VisitChildren(S); }
+
+  void VisitChildren(Stmt *S);
+
+  // Helpers.
+  IdentifierInfo *GetIdentifier(IdentifierInfo *& II, const char *str);
+
+  // Checker-specific methods.
+  void CheckLoopConditionForFloat(const ForStmt *FS);
+  void CheckCall_gets(const CallExpr *CE, const FunctionDecl *FD);
+  void CheckCall_getpw(const CallExpr *CE, const FunctionDecl *FD);
+  void CheckCall_mktemp(const CallExpr *CE, const FunctionDecl *FD);
+  void CheckCall_rand(const CallExpr *CE, const FunctionDecl *FD);
+  void CheckCall_random(const CallExpr *CE, const FunctionDecl *FD);
+  void CheckUncheckedReturnValue(CallExpr *CE);
+};
+} // end anonymous namespace
+
+//===----------------------------------------------------------------------===//
+// Helper methods.
+//===----------------------------------------------------------------------===//
+
+IdentifierInfo *WalkAST::GetIdentifier(IdentifierInfo *& II, const char *str) {
+  if (!II)
+    II = &BR.getContext().Idents.get(str);
+
+  return II;
+}
+
+//===----------------------------------------------------------------------===//
+// AST walking.
+//===----------------------------------------------------------------------===//
+
+void WalkAST::VisitChildren(Stmt *S) {
+  for (Stmt::child_iterator I = S->child_begin(), E = S->child_end(); I!=E; ++I)
+    if (Stmt *child = *I)
+      Visit(child);
+}
+
+void WalkAST::VisitCallExpr(CallExpr *CE) {
+  if (const FunctionDecl *FD = CE->getDirectCallee()) {
+    CheckCall_gets(CE, FD);
+    CheckCall_getpw(CE, FD);
+    CheckCall_mktemp(CE, FD);
+    if (CheckRand) {
+      CheckCall_rand(CE, FD);
+      CheckCall_random(CE, FD);
+    }
+  }
+
+  // Recurse and check children.
+  VisitChildren(CE);
+}
+
+void WalkAST::VisitCompoundStmt(CompoundStmt *S) {
+  for (Stmt::child_iterator I = S->child_begin(), E = S->child_end(); I!=E; ++I)
+    if (Stmt *child = *I) {
+      if (CallExpr *CE = dyn_cast<CallExpr>(child))
+        CheckUncheckedReturnValue(CE);
+      Visit(child);
+    }
+}
+
+void WalkAST::VisitForStmt(ForStmt *FS) {
+  CheckLoopConditionForFloat(FS);
+
+  // Recurse and check children.
+  VisitChildren(FS);
+}
+
+//===----------------------------------------------------------------------===//
+// Check: floating poing variable used as loop counter.
+// Originally: <rdar://problem/6336718>
+// Implements: CERT security coding advisory FLP-30.
+//===----------------------------------------------------------------------===//
+
+static const DeclRefExpr*
+GetIncrementedVar(const Expr *expr, const VarDecl *x, const VarDecl *y) {
+  expr = expr->IgnoreParenCasts();
+
+  if (const BinaryOperator *B = dyn_cast<BinaryOperator>(expr)) {
+    if (!(B->isAssignmentOp() || B->isCompoundAssignmentOp() ||
+          B->getOpcode() == BinaryOperator::Comma))
+      return NULL;
+
+    if (const DeclRefExpr *lhs = GetIncrementedVar(B->getLHS(), x, y))
+      return lhs;
+
+    if (const DeclRefExpr *rhs = GetIncrementedVar(B->getRHS(), x, y))
+      return rhs;
+
+    return NULL;
+  }
+
+  if (const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(expr)) {
+    const NamedDecl *ND = DR->getDecl();
+    return ND == x || ND == y ? DR : NULL;
+  }
+
+  if (const UnaryOperator *U = dyn_cast<UnaryOperator>(expr))
+    return U->isIncrementDecrementOp()
+      ? GetIncrementedVar(U->getSubExpr(), x, y) : NULL;
+
+  return NULL;
+}
+
+/// CheckLoopConditionForFloat - This check looks for 'for' statements that
+///  use a floating point variable as a loop counter.
+///  CERT: FLP30-C, FLP30-CPP.
+///
+void WalkAST::CheckLoopConditionForFloat(const ForStmt *FS) {
+  // Does the loop have a condition?
+  const Expr *condition = FS->getCond();
+
+  if (!condition)
+    return;
+
+  // Does the loop have an increment?
+  const Expr *increment = FS->getInc();
+
+  if (!increment)
+    return;
+
+  // Strip away '()' and casts.
+  condition = condition->IgnoreParenCasts();
+  increment = increment->IgnoreParenCasts();
+
+  // Is the loop condition a comparison?
+  const BinaryOperator *B = dyn_cast<BinaryOperator>(condition);
+
+  if (!B)
+    return;
+
+  // Is this a comparison?
+  if (!(B->isRelationalOp() || B->isEqualityOp()))
+    return;
+
+  // Are we comparing variables?
+  const DeclRefExpr *drLHS = dyn_cast<DeclRefExpr>(B->getLHS()->IgnoreParens());
+  const DeclRefExpr *drRHS = dyn_cast<DeclRefExpr>(B->getRHS()->IgnoreParens());
+
+  // Does at least one of the variables have a floating point type?
+  drLHS = drLHS && drLHS->getType()->isFloatingType() ? drLHS : NULL;
+  drRHS = drRHS && drRHS->getType()->isFloatingType() ? drRHS : NULL;
+
+  if (!drLHS && !drRHS)
+    return;
+
+  const VarDecl *vdLHS = drLHS ? dyn_cast<VarDecl>(drLHS->getDecl()) : NULL;
+  const VarDecl *vdRHS = drRHS ? dyn_cast<VarDecl>(drRHS->getDecl()) : NULL;
+
+  if (!vdLHS && !vdRHS)
+    return;
+
+  // Does either variable appear in increment?
+  const DeclRefExpr *drInc = GetIncrementedVar(increment, vdLHS, vdRHS);
+
+  if (!drInc)
+    return;
+
+  // Emit the error.  First figure out which DeclRefExpr in the condition
+  // referenced the compared variable.
+  const DeclRefExpr *drCond = vdLHS == drInc->getDecl() ? drLHS : drRHS;
+
+  llvm::SmallVector<SourceRange, 2> ranges;
+  std::string sbuf;
+  llvm::raw_string_ostream os(sbuf);
+
+  os << "Variable '" << drCond->getDecl()->getNameAsCString()
+     << "' with floating point type '" << drCond->getType().getAsString()
+     << "' should not be used as a loop counter";
+
+  ranges.push_back(drCond->getSourceRange());
+  ranges.push_back(drInc->getSourceRange());
+
+  const char *bugType = "Floating point variable used as loop counter";
+  BR.EmitBasicReport(bugType, "Security", os.str(),
+                     FS->getLocStart(), ranges.data(), ranges.size());
+}
+
+//===----------------------------------------------------------------------===//
+// Check: Any use of 'gets' is insecure.
+// Originally: <rdar://problem/6335715>
+// Implements (part of): 300-BSI (buildsecurityin.us-cert.gov)
+// CWE-242: Use of Inherently Dangerous Function
+//===----------------------------------------------------------------------===//
+
+void WalkAST::CheckCall_gets(const CallExpr *CE, const FunctionDecl *FD) {
+  if (FD->getIdentifier() != GetIdentifier(II_gets, "gets"))
+    return;
+
+  const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(FD->getType());
+  if (!FPT)
+    return;
+
+  // Verify that the function takes a single argument.
+  if (FPT->getNumArgs() != 1)
+    return;
+
+  // Is the argument a 'char*'?
+  const PointerType *PT = dyn_cast<PointerType>(FPT->getArgType(0));
+  if (!PT)
+    return;
+
+  if (PT->getPointeeType().getUnqualifiedType() != BR.getContext().CharTy)
+    return;
+
+  // Issue a warning.
+  SourceRange R = CE->getCallee()->getSourceRange();
+  BR.EmitBasicReport("Potential buffer overflow in call to 'gets'",
+                     "Security",
+                     "Call to function 'gets' is extremely insecure as it can "
+                     "always result in a buffer overflow",
+                     CE->getLocStart(), &R, 1);
+}
+
+//===----------------------------------------------------------------------===//
+// Check: Any use of 'getpwd' is insecure.
+// CWE-477: Use of Obsolete Functions
+//===----------------------------------------------------------------------===//
+
+void WalkAST::CheckCall_getpw(const CallExpr *CE, const FunctionDecl *FD) {
+  if (FD->getIdentifier() != GetIdentifier(II_getpw, "getpw"))
+    return;
+
+  const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(FD->getType());
+  if (!FPT)
+    return;
+
+  // Verify that the function takes two arguments.
+  if (FPT->getNumArgs() != 2)
+    return;
+
+  // Verify the first argument type is integer.
+  if (!FPT->getArgType(0)->isIntegerType())
+    return;
+
+  // Verify the second argument type is char*.
+  const PointerType *PT = dyn_cast<PointerType>(FPT->getArgType(1));
+  if (!PT)
+    return;
+
+  if (PT->getPointeeType().getUnqualifiedType() != BR.getContext().CharTy)
+    return;
+
+  // Issue a warning.
+  SourceRange R = CE->getCallee()->getSourceRange();
+  BR.EmitBasicReport("Potential buffer overflow in call to 'getpw'",
+                     "Security",
+                     "The getpw() function is dangerous as it may overflow the "
+                     "provided buffer. It is obsoleted by getpwuid().",
+                     CE->getLocStart(), &R, 1);
+}
+
+//===----------------------------------------------------------------------===//
+// Check: Any use of 'mktemp' is insecure.It is obsoleted by mkstemp().
+// CWE-377: Insecure Temporary File
+//===----------------------------------------------------------------------===//
+
+void WalkAST::CheckCall_mktemp(const CallExpr *CE, const FunctionDecl *FD) {
+  if (FD->getIdentifier() != GetIdentifier(II_mktemp, "mktemp"))
+    return;
+
+  const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(FD->getType());
+  if(!FPT)
+    return;
+  
+  // Verify that the funcion takes a single argument.
+  if (FPT->getNumArgs() != 1)
+    return;
+
+  // Verify that the argument is Pointer Type.
+  const PointerType *PT = dyn_cast<PointerType>(FPT->getArgType(0));
+  if (!PT)
+    return;
+
+  // Verify that the argument is a 'char*'.
+  if (PT->getPointeeType().getUnqualifiedType() != BR.getContext().CharTy)
+    return;
+  
+  // Issue a waring.
+  SourceRange R = CE->getCallee()->getSourceRange();
+  BR.EmitBasicReport("Potential insecure temporary file in call 'mktemp'",
+		     "Security",
+		     "Call to function 'mktemp' is insecure as it always "
+		     "creates or uses insecure temporary file",
+		     CE->getLocStart(), &R, 1);
+}
+
+
+//===----------------------------------------------------------------------===//
+// Check: Linear congruent random number generators should not be used
+// Originally: <rdar://problem/63371000>
+// CWE-338: Use of cryptographically weak prng
+//===----------------------------------------------------------------------===//
+
+void WalkAST::CheckCall_rand(const CallExpr *CE, const FunctionDecl *FD) {
+  if (II_rand[0] == NULL) {
+    // This check applies to these functions
+    static const char * const identifiers[num_rands] = {
+      "drand48", "erand48", "jrand48", "lrand48", "mrand48", "nrand48",
+      "lcong48",
+      "rand", "rand_r"
+    };
+
+    for (size_t i = 0; i < num_rands; i++)
+      II_rand[i] = &BR.getContext().Idents.get(identifiers[i]);
+  }
+
+  const IdentifierInfo *id = FD->getIdentifier();
+  size_t identifierid;
+
+  for (identifierid = 0; identifierid < num_rands; identifierid++)
+    if (id == II_rand[identifierid])
+      break;
+
+  if (identifierid >= num_rands)
+    return;
+
+  const FunctionProtoType *FTP = dyn_cast<FunctionProtoType>(FD->getType());
+  if (!FTP)
+    return;
+
+  if (FTP->getNumArgs() == 1) {
+    // Is the argument an 'unsigned short *'?
+    // (Actually any integer type is allowed.)
+    const PointerType *PT = dyn_cast<PointerType>(FTP->getArgType(0));
+    if (!PT)
+      return;
+
+    if (! PT->getPointeeType()->isIntegerType())
+      return;
+  }
+  else if (FTP->getNumArgs() != 0)
+    return;
+
+  // Issue a warning.
+  std::string buf1;
+  llvm::raw_string_ostream os1(buf1);
+  os1 << "'" << FD->getNameAsString() << "' is a poor random number generator";
+
+  std::string buf2;
+  llvm::raw_string_ostream os2(buf2);
+  os2 << "Function '" << FD->getNameAsString()
+      << "' is obsolete because it implements a poor random number generator."
+      << "  Use 'arc4random' instead";
+
+  SourceRange R = CE->getCallee()->getSourceRange();
+
+  BR.EmitBasicReport(os1.str(), "Security", os2.str(),
+                     CE->getLocStart(), &R, 1);
+}
+
+//===----------------------------------------------------------------------===//
+// Check: 'random' should not be used
+// Originally: <rdar://problem/63371000>
+//===----------------------------------------------------------------------===//
+
+void WalkAST::CheckCall_random(const CallExpr *CE, const FunctionDecl *FD) {
+  if (FD->getIdentifier() != GetIdentifier(II_random, "random"))
+    return;
+
+  const FunctionProtoType *FTP = dyn_cast<FunctionProtoType>(FD->getType());
+  if (!FTP)
+    return;
+
+  // Verify that the function takes no argument.
+  if (FTP->getNumArgs() != 0)
+    return;
+
+  // Issue a warning.
+  SourceRange R = CE->getCallee()->getSourceRange();
+  BR.EmitBasicReport("'random' is not a secure random number generator",
+                     "Security",
+                     "The 'random' function produces a sequence of values that "
+                     "an adversary may be able to predict.  Use 'arc4random' "
+                     "instead",
+                     CE->getLocStart(), &R, 1);
+}
+
+//===----------------------------------------------------------------------===//
+// Check: Should check whether privileges are dropped successfully.
+// Originally: <rdar://problem/6337132>
+//===----------------------------------------------------------------------===//
+
+void WalkAST::CheckUncheckedReturnValue(CallExpr *CE) {
+  const FunctionDecl *FD = CE->getDirectCallee();
+  if (!FD)
+    return;
+
+  if (II_setid[0] == NULL) {
+    static const char * const identifiers[num_setids] = {
+      "setuid", "setgid", "seteuid", "setegid",
+      "setreuid", "setregid"
+    };
+
+    for (size_t i = 0; i < num_setids; i++)
+      II_setid[i] = &BR.getContext().Idents.get(identifiers[i]);
+  }
+
+  const IdentifierInfo *id = FD->getIdentifier();
+  size_t identifierid;
+
+  for (identifierid = 0; identifierid < num_setids; identifierid++)
+    if (id == II_setid[identifierid])
+      break;
+
+  if (identifierid >= num_setids)
+    return;
+
+  const FunctionProtoType *FTP = dyn_cast<FunctionProtoType>(FD->getType());
+  if (!FTP)
+    return;
+
+  // Verify that the function takes one or two arguments (depending on
+  //   the function).
+  if (FTP->getNumArgs() != (identifierid < 4 ? 1 : 2))
+    return;
+
+  // The arguments must be integers.
+  for (unsigned i = 0; i < FTP->getNumArgs(); i++)
+    if (! FTP->getArgType(i)->isIntegerType())
+      return;
+
+  // Issue a warning.
+  std::string buf1;
+  llvm::raw_string_ostream os1(buf1);
+  os1 << "Return value is not checked in call to '" << FD->getNameAsString()
+     << "'";
+
+  std::string buf2;
+  llvm::raw_string_ostream os2(buf2);
+  os2 << "The return value from the call to '" << FD->getNameAsString()
+      << "' is not checked.  If an error occurs in '"
+      << FD->getNameAsString()
+      << "', the following code may execute with unexpected privileges";
+
+  SourceRange R = CE->getCallee()->getSourceRange();
+
+  BR.EmitBasicReport(os1.str(), "Security", os2.str(),
+                     CE->getLocStart(), &R, 1);
+}
+
+//===----------------------------------------------------------------------===//
+// Entry point for check.
+//===----------------------------------------------------------------------===//
+
+void clang::CheckSecuritySyntaxOnly(const Decl *D, BugReporter &BR) {
+  WalkAST walker(BR);
+  walker.Visit(D->getBody());
+}