68 lines
2.2 KiB
C++
68 lines
2.2 KiB
C++
|
//=== 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/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 OwningPtr<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;
|
||
|
|
|
||
|
|
ProgramStateRef state = C.getState();
|
||
|
|
SVal RV = state->getSVal(B->getRHS(), C.getLocationContext());
|
||
|
|
|
||
|
|
if (!RV.isConstant() || RV.isZeroConstant())
|
||
|
|
return;
|
||
|
|
|
||
|
|
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);
|
||
|
|
R->addRange(B->getRHS()->getSourceRange());
|
||
|
|
C.emitReport(R);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void ento::registerFixedAddressChecker(CheckerManager &mgr) {
|
||
|
|
mgr.registerChecker<FixedAddressChecker>();
|
||
|
|
}
|