mirror of
https://github.com/llvm/llvm-project.git
synced 2025-04-28 08:26:07 +00:00
18f219c5ac
Cleanup most of the lazy-init `BugType` legacy. Some will be preserved, as those are slightly more complicated to refactor. Notice, that the default category for `BugType` is `LogicError`. I omitted setting this explicitly where I could. Please, actually have a look at the diff. I did this manually, and we rarely check the bug type descriptions and stuff in tests, so the testing might be shallow on this one.
93 lines
3.1 KiB
C++
93 lines
3.1 KiB
C++
//== ArrayBoundChecker.cpp ------------------------------*- 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 file defines ArrayBoundChecker, which is a path-sensitive check
|
|
// which looks for an out-of-bound array element access.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#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"
|
|
#include "clang/StaticAnalyzer/Core/PathSensitive/DynamicExtent.h"
|
|
#include "clang/StaticAnalyzer/Core/PathSensitive/ExprEngine.h"
|
|
|
|
using namespace clang;
|
|
using namespace ento;
|
|
|
|
namespace {
|
|
class ArrayBoundChecker :
|
|
public Checker<check::Location> {
|
|
const BugType BT{this, "Out-of-bound array access"};
|
|
|
|
public:
|
|
void checkLocation(SVal l, bool isLoad, const Stmt* S,
|
|
CheckerContext &C) const;
|
|
};
|
|
}
|
|
|
|
void ArrayBoundChecker::checkLocation(SVal l, bool isLoad, const Stmt* LoadS,
|
|
CheckerContext &C) const {
|
|
// Check for out of bound array element access.
|
|
const MemRegion *R = l.getAsRegion();
|
|
if (!R)
|
|
return;
|
|
|
|
const ElementRegion *ER = dyn_cast<ElementRegion>(R);
|
|
if (!ER)
|
|
return;
|
|
|
|
// Get the index of the accessed element.
|
|
DefinedOrUnknownSVal Idx = ER->getIndex().castAs<DefinedOrUnknownSVal>();
|
|
|
|
// Zero index is always in bound, this also passes ElementRegions created for
|
|
// pointer casts.
|
|
if (Idx.isZeroConstant())
|
|
return;
|
|
|
|
ProgramStateRef state = C.getState();
|
|
|
|
// Get the size of the array.
|
|
DefinedOrUnknownSVal ElementCount = getDynamicElementCount(
|
|
state, ER->getSuperRegion(), C.getSValBuilder(), ER->getValueType());
|
|
|
|
ProgramStateRef StInBound, StOutBound;
|
|
std::tie(StInBound, StOutBound) = state->assumeInBoundDual(Idx, ElementCount);
|
|
if (StOutBound && !StInBound) {
|
|
ExplodedNode *N = C.generateErrorNode(StOutBound);
|
|
if (!N)
|
|
return;
|
|
|
|
// FIXME: It would be nice to eventually make this diagnostic more clear,
|
|
// e.g., by referencing the original declaration or by saying *why* this
|
|
// reference is outside the range.
|
|
|
|
// Generate a report for this bug.
|
|
auto report = std::make_unique<PathSensitiveBugReport>(
|
|
BT, "Access out-of-bound array element (buffer overflow)", N);
|
|
|
|
report->addRange(LoadS->getSourceRange());
|
|
C.emitReport(std::move(report));
|
|
return;
|
|
}
|
|
|
|
// Array bound check succeeded. From this point forward the array bound
|
|
// should always succeed.
|
|
C.addTransition(StInBound);
|
|
}
|
|
|
|
void ento::registerArrayBoundChecker(CheckerManager &mgr) {
|
|
mgr.registerChecker<ArrayBoundChecker>();
|
|
}
|
|
|
|
bool ento::shouldRegisterArrayBoundChecker(const CheckerManager &mgr) {
|
|
return true;
|
|
}
|