blob: d570da001e86284dc9675a78fd2a1a19f109ef50 [file] [log] [blame]
//=== 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 llvm::OwningPtr<BuiltinBug> BT;
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)
QualType T = B->getType();
if (!T->isPointerType())
const ProgramState *state = C.getState();
SVal RV = state->getSVal(B->getRHS(), C.getLocationContext());
if (!RV.isConstant() || RV.isZeroConstant())
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);
void ento::registerFixedAddressChecker(CheckerManager &mgr) {