1 //=== FixedAddressChecker.cpp - Fixed address usage checker ----*- C++ -*--===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This files defines FixedAddressChecker, a builtin checker that checks for
11 // assignment of a fixed address to a pointer.
12 // This check corresponds to CWE-587.
14 //===----------------------------------------------------------------------===//
16 #include "ClangSACheckers.h"
17 #include "clang/StaticAnalyzer/Core/Checker.h"
18 #include "clang/StaticAnalyzer/Core/CheckerManager.h"
19 #include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
20 #include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
22 using namespace clang;
26 class FixedAddressChecker
27 : public Checker< check::PreStmt<BinaryOperator> > {
28 mutable llvm::OwningPtr<BuiltinBug> BT;
31 void checkPreStmt(const BinaryOperator *B, CheckerContext &C) const;
35 void FixedAddressChecker::checkPreStmt(const BinaryOperator *B,
36 CheckerContext &C) const {
37 // Using a fixed address is not portable because that address will probably
38 // not be valid in all environments or platforms.
40 if (B->getOpcode() != BO_Assign)
43 QualType T = B->getType();
44 if (!T->isPointerType())
47 const ProgramState *state = C.getState();
49 SVal RV = state->getSVal(B->getRHS());
51 if (!RV.isConstant() || RV.isZeroConstant())
54 if (ExplodedNode *N = C.generateNode()) {
56 BT.reset(new BuiltinBug("Use fixed address",
57 "Using a fixed address is not portable because that "
58 "address will probably not be valid in all "
59 "environments or platforms."));
60 BugReport *R = new BugReport(*BT, BT->getDescription(), N);
61 R->addRange(B->getRHS()->getSourceRange());
66 void ento::registerFixedAddressChecker(CheckerManager &mgr) {
67 mgr.registerChecker<FixedAddressChecker>();