8a5cfdf785
...because it provides no useful functionality compared to its base class `BugType`. A long time ago there were substantial differences between `BugType` and `BuiltinBug`, but they were eliminated by commit 1bd58233 in 2009 (!). Since then the only functionality provided by `BuiltinBug` was that it specified `categories::LogicError` as the bug category and it stored an extra data member `desc`. This commit sets `categories::LogicError` as the default value of the third argument (bug category) in the constructors of BugType and replaces use of the `desc` field with simpler logic. Note that `BugType` has a data member `Description` and a non-virtual method `BugType::getDescription()` which queries it; these are distinct from the member `desc` of `BuiltinBug` and the identically named method `BuiltinBug::getDescription()` which queries it. This confusing name collision was a major motivation for the elimination of `BuiltinBug`. As this commit touches many files, I avoided functional changes and left behind FIXME notes to mark minor issues that should be fixed later. Differential Revision: https://reviews.llvm.org/D158855
71 lines
2.3 KiB
C++
71 lines
2.3 KiB
C++
//=== 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<BugType> 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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// FIXME: improve grammar in the following strings:
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if (!BT)
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BT.reset(new BugType(this, "Use fixed address"));
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constexpr llvm::StringLiteral Msg =
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"Using a fixed address is not portable because that address will "
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"probably not be valid in all environments or platforms.";
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auto R = std::make_unique<PathSensitiveBugReport>(*BT, Msg, 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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