//=== FixedAddressChecker.cpp - Fixed address usage checker ----*- C++ -*--===// // // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. // See https://llvm.org/LICENSE.txt for license information. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception // //===----------------------------------------------------------------------===// // // 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 "clang/StaticAnalyzer/Checkers/BuiltinCheckerRegistration.h" #include "clang/StaticAnalyzer/Core/BugReporter/BugType.h" #include "clang/StaticAnalyzer/Core/Checker.h" #include "clang/StaticAnalyzer/Core/CheckerManager.h" #include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h" using namespace clang; using namespace ento; namespace { class FixedAddressChecker : public Checker< check::PreStmt<BinaryOperator> > { mutable std::unique_ptr<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; SVal RV = C.getSVal(B->getRHS()); if (!RV.isConstant() || RV.isZeroConstant()) return; if (ExplodedNode *N = C.generateNonFatalErrorNode()) { if (!BT) BT.reset( new BuiltinBug(this, "Use fixed address", "Using a fixed address is not portable because that " "address will probably not be valid in all " "environments or platforms.")); auto R = std::make_unique<PathSensitiveBugReport>(*BT, BT->getDescription(), N); R->addRange(B->getRHS()->getSourceRange()); C.emitReport(std::move(R)); } } void ento::registerFixedAddressChecker(CheckerManager &mgr) { mgr.registerChecker<FixedAddressChecker>(); } bool ento::shouldRegisterFixedAddressChecker(const CheckerManager &mgr) { return true; } |