72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
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//=== FixedAddressChecker.cpp - Fixed address usage checker ----*- C++ -*--===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This files defines FixedAddressChecker, a builtin checker that checks for
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// assignment of a fixed address to a pointer.
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// This check corresponds to CWE-587.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/StaticAnalyzer/Checkers/BuiltinCheckerRegistration.h"
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#include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
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#include "clang/StaticAnalyzer/Core/Checker.h"
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#include "clang/StaticAnalyzer/Core/CheckerManager.h"
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#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
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using namespace clang;
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using namespace ento;
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namespace {
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class FixedAddressChecker
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: public Checker< check::PreStmt<BinaryOperator> > {
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mutable std::unique_ptr<BuiltinBug> BT;
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public:
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void checkPreStmt(const BinaryOperator *B, CheckerContext &C) const;
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};
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}
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void FixedAddressChecker::checkPreStmt(const BinaryOperator *B,
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CheckerContext &C) const {
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// Using a fixed address is not portable because that address will probably
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// not be valid in all environments or platforms.
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if (B->getOpcode() != BO_Assign)
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return;
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QualType T = B->getType();
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if (!T->isPointerType())
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return;
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SVal RV = C.getSVal(B->getRHS());
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if (!RV.isConstant() || RV.isZeroConstant())
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return;
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if (ExplodedNode *N = C.generateNonFatalErrorNode()) {
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if (!BT)
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BT.reset(
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new BuiltinBug(this, "Use fixed address",
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"Using a fixed address is not portable because that "
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"address will probably not be valid in all "
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"environments or platforms."));
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auto R =
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std::make_unique<PathSensitiveBugReport>(*BT, BT->getDescription(), N);
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R->addRange(B->getRHS()->getSourceRange());
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C.emitReport(std::move(R));
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}
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}
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void ento::registerFixedAddressChecker(CheckerManager &mgr) {
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mgr.registerChecker<FixedAddressChecker>();
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}
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bool ento::shouldRegisterFixedAddressChecker(const CheckerManager &mgr) {
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return true;
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}
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