453 lines
16 KiB
C++
453 lines
16 KiB
C++
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//==- ExprInspectionChecker.cpp - Used for regression tests ------*- 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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#include "Taint.h"
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#include "clang/Analysis/IssueHash.h"
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#include "clang/StaticAnalyzer/Checkers/BuiltinCheckerRegistration.h"
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#include "clang/StaticAnalyzer/Checkers/SValExplainer.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/PathSensitive/CallEvent.h"
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#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
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#include "clang/StaticAnalyzer/Core/PathSensitive/DynamicSize.h"
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#include "llvm/ADT/StringSwitch.h"
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#include "llvm/Support/ScopedPrinter.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 ExprInspectionChecker : public Checker<eval::Call, check::DeadSymbols,
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check::EndAnalysis> {
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mutable std::unique_ptr<BugType> BT;
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// These stats are per-analysis, not per-branch, hence they shouldn't
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// stay inside the program state.
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struct ReachedStat {
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ExplodedNode *ExampleNode;
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unsigned NumTimesReached;
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};
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mutable llvm::DenseMap<const CallExpr *, ReachedStat> ReachedStats;
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void analyzerEval(const CallExpr *CE, CheckerContext &C) const;
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void analyzerCheckInlined(const CallExpr *CE, CheckerContext &C) const;
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void analyzerWarnIfReached(const CallExpr *CE, CheckerContext &C) const;
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void analyzerNumTimesReached(const CallExpr *CE, CheckerContext &C) const;
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void analyzerCrash(const CallExpr *CE, CheckerContext &C) const;
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void analyzerWarnOnDeadSymbol(const CallExpr *CE, CheckerContext &C) const;
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void analyzerDump(const CallExpr *CE, CheckerContext &C) const;
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void analyzerExplain(const CallExpr *CE, CheckerContext &C) const;
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void analyzerPrintState(const CallExpr *CE, CheckerContext &C) const;
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void analyzerGetExtent(const CallExpr *CE, CheckerContext &C) const;
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void analyzerHashDump(const CallExpr *CE, CheckerContext &C) const;
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void analyzerDenote(const CallExpr *CE, CheckerContext &C) const;
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void analyzerExpress(const CallExpr *CE, CheckerContext &C) const;
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void analyzerIsTainted(const CallExpr *CE, CheckerContext &C) const;
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typedef void (ExprInspectionChecker::*FnCheck)(const CallExpr *,
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CheckerContext &C) const;
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// Optional parameter `ExprVal` for expression value to be marked interesting.
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ExplodedNode *reportBug(llvm::StringRef Msg, CheckerContext &C,
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Optional<SVal> ExprVal = None) const;
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ExplodedNode *reportBug(llvm::StringRef Msg, BugReporter &BR,
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ExplodedNode *N,
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Optional<SVal> ExprVal = None) const;
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public:
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bool evalCall(const CallEvent &Call, CheckerContext &C) const;
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void checkDeadSymbols(SymbolReaper &SymReaper, CheckerContext &C) const;
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void checkEndAnalysis(ExplodedGraph &G, BugReporter &BR,
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ExprEngine &Eng) const;
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};
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}
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REGISTER_SET_WITH_PROGRAMSTATE(MarkedSymbols, SymbolRef)
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REGISTER_MAP_WITH_PROGRAMSTATE(DenotedSymbols, SymbolRef, const StringLiteral *)
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bool ExprInspectionChecker::evalCall(const CallEvent &Call,
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CheckerContext &C) const {
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const auto *CE = dyn_cast_or_null<CallExpr>(Call.getOriginExpr());
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if (!CE)
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return false;
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// These checks should have no effect on the surrounding environment
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// (globals should not be invalidated, etc), hence the use of evalCall.
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FnCheck Handler =
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llvm::StringSwitch<FnCheck>(C.getCalleeName(CE))
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.Case("clang_analyzer_eval", &ExprInspectionChecker::analyzerEval)
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.Case("clang_analyzer_checkInlined",
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&ExprInspectionChecker::analyzerCheckInlined)
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.Case("clang_analyzer_crash", &ExprInspectionChecker::analyzerCrash)
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.Case("clang_analyzer_warnIfReached",
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&ExprInspectionChecker::analyzerWarnIfReached)
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.Case("clang_analyzer_warnOnDeadSymbol",
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&ExprInspectionChecker::analyzerWarnOnDeadSymbol)
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.StartsWith("clang_analyzer_explain",
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&ExprInspectionChecker::analyzerExplain)
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.StartsWith("clang_analyzer_dump",
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&ExprInspectionChecker::analyzerDump)
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.Case("clang_analyzer_getExtent",
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&ExprInspectionChecker::analyzerGetExtent)
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.Case("clang_analyzer_printState",
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&ExprInspectionChecker::analyzerPrintState)
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.Case("clang_analyzer_numTimesReached",
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&ExprInspectionChecker::analyzerNumTimesReached)
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.Case("clang_analyzer_hashDump",
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&ExprInspectionChecker::analyzerHashDump)
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.Case("clang_analyzer_denote", &ExprInspectionChecker::analyzerDenote)
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.Case("clang_analyzer_express",
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&ExprInspectionChecker::analyzerExpress)
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.StartsWith("clang_analyzer_isTainted",
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&ExprInspectionChecker::analyzerIsTainted)
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.Default(nullptr);
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if (!Handler)
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return false;
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(this->*Handler)(CE, C);
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return true;
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}
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static const char *getArgumentValueString(const CallExpr *CE,
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CheckerContext &C) {
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if (CE->getNumArgs() == 0)
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return "Missing assertion argument";
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ExplodedNode *N = C.getPredecessor();
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const LocationContext *LC = N->getLocationContext();
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ProgramStateRef State = N->getState();
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const Expr *Assertion = CE->getArg(0);
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SVal AssertionVal = State->getSVal(Assertion, LC);
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if (AssertionVal.isUndef())
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return "UNDEFINED";
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ProgramStateRef StTrue, StFalse;
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std::tie(StTrue, StFalse) =
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State->assume(AssertionVal.castAs<DefinedOrUnknownSVal>());
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if (StTrue) {
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if (StFalse)
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return "UNKNOWN";
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else
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return "TRUE";
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} else {
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if (StFalse)
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return "FALSE";
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else
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llvm_unreachable("Invalid constraint; neither true or false.");
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}
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}
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ExplodedNode *ExprInspectionChecker::reportBug(llvm::StringRef Msg,
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CheckerContext &C,
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Optional<SVal> ExprVal) const {
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ExplodedNode *N = C.generateNonFatalErrorNode();
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reportBug(Msg, C.getBugReporter(), N, ExprVal);
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return N;
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}
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ExplodedNode *ExprInspectionChecker::reportBug(llvm::StringRef Msg,
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BugReporter &BR,
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ExplodedNode *N,
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Optional<SVal> ExprVal) const {
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if (!N)
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return nullptr;
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if (!BT)
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BT.reset(new BugType(this, "Checking analyzer assumptions", "debug"));
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auto R = std::make_unique<PathSensitiveBugReport>(*BT, Msg, N);
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if (ExprVal) {
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R->markInteresting(*ExprVal);
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}
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BR.emitReport(std::move(R));
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return N;
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}
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void ExprInspectionChecker::analyzerEval(const CallExpr *CE,
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CheckerContext &C) const {
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const LocationContext *LC = C.getPredecessor()->getLocationContext();
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// A specific instantiation of an inlined function may have more constrained
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// values than can generally be assumed. Skip the check.
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if (LC->getStackFrame()->getParent() != nullptr)
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return;
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reportBug(getArgumentValueString(CE, C), C);
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}
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void ExprInspectionChecker::analyzerWarnIfReached(const CallExpr *CE,
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CheckerContext &C) const {
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reportBug("REACHABLE", C);
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}
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void ExprInspectionChecker::analyzerNumTimesReached(const CallExpr *CE,
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CheckerContext &C) const {
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++ReachedStats[CE].NumTimesReached;
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if (!ReachedStats[CE].ExampleNode) {
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// Later, in checkEndAnalysis, we'd throw a report against it.
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ReachedStats[CE].ExampleNode = C.generateNonFatalErrorNode();
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}
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}
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void ExprInspectionChecker::analyzerCheckInlined(const CallExpr *CE,
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CheckerContext &C) const {
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const LocationContext *LC = C.getPredecessor()->getLocationContext();
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// An inlined function could conceivably also be analyzed as a top-level
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// function. We ignore this case and only emit a message (TRUE or FALSE)
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// when we are analyzing it as an inlined function. This means that
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// clang_analyzer_checkInlined(true) should always print TRUE, but
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// clang_analyzer_checkInlined(false) should never actually print anything.
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if (LC->getStackFrame()->getParent() == nullptr)
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return;
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reportBug(getArgumentValueString(CE, C), C);
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}
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void ExprInspectionChecker::analyzerExplain(const CallExpr *CE,
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CheckerContext &C) const {
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if (CE->getNumArgs() == 0) {
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reportBug("Missing argument for explaining", C);
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return;
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}
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SVal V = C.getSVal(CE->getArg(0));
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SValExplainer Ex(C.getASTContext());
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reportBug(Ex.Visit(V), C);
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}
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void ExprInspectionChecker::analyzerDump(const CallExpr *CE,
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CheckerContext &C) const {
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if (CE->getNumArgs() == 0) {
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reportBug("Missing argument for dumping", C);
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return;
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}
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SVal V = C.getSVal(CE->getArg(0));
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llvm::SmallString<32> Str;
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llvm::raw_svector_ostream OS(Str);
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V.dumpToStream(OS);
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reportBug(OS.str(), C);
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}
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void ExprInspectionChecker::analyzerGetExtent(const CallExpr *CE,
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CheckerContext &C) const {
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if (CE->getNumArgs() == 0) {
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reportBug("Missing region for obtaining extent", C);
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return;
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}
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auto MR = dyn_cast_or_null<SubRegion>(C.getSVal(CE->getArg(0)).getAsRegion());
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if (!MR) {
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reportBug("Obtaining extent of a non-region", C);
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return;
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}
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ProgramStateRef State = C.getState();
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DefinedOrUnknownSVal Size = getDynamicSize(State, MR, C.getSValBuilder());
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State = State->BindExpr(CE, C.getLocationContext(), Size);
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C.addTransition(State);
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}
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void ExprInspectionChecker::analyzerPrintState(const CallExpr *CE,
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CheckerContext &C) const {
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C.getState()->dump();
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}
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void ExprInspectionChecker::analyzerWarnOnDeadSymbol(const CallExpr *CE,
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CheckerContext &C) const {
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if (CE->getNumArgs() == 0)
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return;
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SVal Val = C.getSVal(CE->getArg(0));
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SymbolRef Sym = Val.getAsSymbol();
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if (!Sym)
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return;
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ProgramStateRef State = C.getState();
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State = State->add<MarkedSymbols>(Sym);
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C.addTransition(State);
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}
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void ExprInspectionChecker::checkDeadSymbols(SymbolReaper &SymReaper,
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CheckerContext &C) const {
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ProgramStateRef State = C.getState();
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const MarkedSymbolsTy &Syms = State->get<MarkedSymbols>();
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ExplodedNode *N = C.getPredecessor();
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for (auto I = Syms.begin(), E = Syms.end(); I != E; ++I) {
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SymbolRef Sym = *I;
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if (!SymReaper.isDead(Sym))
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continue;
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// The non-fatal error node should be the same for all reports.
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if (ExplodedNode *BugNode = reportBug("SYMBOL DEAD", C))
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N = BugNode;
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State = State->remove<MarkedSymbols>(Sym);
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}
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for (auto I : State->get<DenotedSymbols>()) {
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SymbolRef Sym = I.first;
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if (!SymReaper.isLive(Sym))
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State = State->remove<DenotedSymbols>(Sym);
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}
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C.addTransition(State, N);
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}
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void ExprInspectionChecker::checkEndAnalysis(ExplodedGraph &G, BugReporter &BR,
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ExprEngine &Eng) const {
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for (auto Item: ReachedStats) {
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unsigned NumTimesReached = Item.second.NumTimesReached;
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ExplodedNode *N = Item.second.ExampleNode;
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reportBug(llvm::to_string(NumTimesReached), BR, N);
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}
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ReachedStats.clear();
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}
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void ExprInspectionChecker::analyzerCrash(const CallExpr *CE,
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CheckerContext &C) const {
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LLVM_BUILTIN_TRAP;
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}
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void ExprInspectionChecker::analyzerHashDump(const CallExpr *CE,
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CheckerContext &C) const {
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const LangOptions &Opts = C.getLangOpts();
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const SourceManager &SM = C.getSourceManager();
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FullSourceLoc FL(CE->getArg(0)->getBeginLoc(), SM);
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std::string HashContent =
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getIssueString(FL, getCheckerName().getName(), "Category",
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C.getLocationContext()->getDecl(), Opts);
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reportBug(HashContent, C);
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}
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void ExprInspectionChecker::analyzerDenote(const CallExpr *CE,
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CheckerContext &C) const {
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if (CE->getNumArgs() < 2) {
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reportBug("clang_analyzer_denote() requires a symbol and a string literal",
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C);
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return;
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}
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SymbolRef Sym = C.getSVal(CE->getArg(0)).getAsSymbol();
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if (!Sym) {
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reportBug("Not a symbol", C);
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return;
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}
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const auto *E = dyn_cast<StringLiteral>(CE->getArg(1)->IgnoreParenCasts());
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if (!E) {
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reportBug("Not a string literal", C);
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return;
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|
|
}
|
||
|
|
|
||
|
|
ProgramStateRef State = C.getState();
|
||
|
|
|
||
|
|
C.addTransition(C.getState()->set<DenotedSymbols>(Sym, E));
|
||
|
|
}
|
||
|
|
|
||
|
|
namespace {
|
||
|
|
class SymbolExpressor
|
||
|
|
: public SymExprVisitor<SymbolExpressor, Optional<std::string>> {
|
||
|
|
ProgramStateRef State;
|
||
|
|
|
||
|
|
public:
|
||
|
|
SymbolExpressor(ProgramStateRef State) : State(State) {}
|
||
|
|
|
||
|
|
Optional<std::string> lookup(const SymExpr *S) {
|
||
|
|
if (const StringLiteral *const *SLPtr = State->get<DenotedSymbols>(S)) {
|
||
|
|
const StringLiteral *SL = *SLPtr;
|
||
|
|
return std::string(SL->getBytes());
|
||
|
|
}
|
||
|
|
return None;
|
||
|
|
}
|
||
|
|
|
||
|
|
Optional<std::string> VisitSymExpr(const SymExpr *S) {
|
||
|
|
return lookup(S);
|
||
|
|
}
|
||
|
|
|
||
|
|
Optional<std::string> VisitSymIntExpr(const SymIntExpr *S) {
|
||
|
|
if (Optional<std::string> Str = lookup(S))
|
||
|
|
return Str;
|
||
|
|
if (Optional<std::string> Str = Visit(S->getLHS()))
|
||
|
|
return (*Str + " " + BinaryOperator::getOpcodeStr(S->getOpcode()) + " " +
|
||
|
|
std::to_string(S->getRHS().getLimitedValue()) +
|
||
|
|
(S->getRHS().isUnsigned() ? "U" : ""))
|
||
|
|
.str();
|
||
|
|
return None;
|
||
|
|
}
|
||
|
|
|
||
|
|
Optional<std::string> VisitSymSymExpr(const SymSymExpr *S) {
|
||
|
|
if (Optional<std::string> Str = lookup(S))
|
||
|
|
return Str;
|
||
|
|
if (Optional<std::string> Str1 = Visit(S->getLHS()))
|
||
|
|
if (Optional<std::string> Str2 = Visit(S->getRHS()))
|
||
|
|
return (*Str1 + " " + BinaryOperator::getOpcodeStr(S->getOpcode()) +
|
||
|
|
" " + *Str2).str();
|
||
|
|
return None;
|
||
|
|
}
|
||
|
|
|
||
|
|
Optional<std::string> VisitSymbolCast(const SymbolCast *S) {
|
||
|
|
if (Optional<std::string> Str = lookup(S))
|
||
|
|
return Str;
|
||
|
|
if (Optional<std::string> Str = Visit(S->getOperand()))
|
||
|
|
return (Twine("(") + S->getType().getAsString() + ")" + *Str).str();
|
||
|
|
return None;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
} // namespace
|
||
|
|
|
||
|
|
void ExprInspectionChecker::analyzerExpress(const CallExpr *CE,
|
||
|
|
CheckerContext &C) const {
|
||
|
|
if (CE->getNumArgs() == 0) {
|
||
|
|
reportBug("clang_analyzer_express() requires a symbol", C);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
SVal ArgVal = C.getSVal(CE->getArg(0));
|
||
|
|
SymbolRef Sym = ArgVal.getAsSymbol();
|
||
|
|
if (!Sym) {
|
||
|
|
reportBug("Not a symbol", C);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
SymbolExpressor V(C.getState());
|
||
|
|
auto Str = V.Visit(Sym);
|
||
|
|
if (!Str) {
|
||
|
|
reportBug("Unable to express", C);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
reportBug(*Str, C, ArgVal);
|
||
|
|
}
|
||
|
|
|
||
|
|
void ExprInspectionChecker::analyzerIsTainted(const CallExpr *CE,
|
||
|
|
CheckerContext &C) const {
|
||
|
|
if (CE->getNumArgs() != 1) {
|
||
|
|
reportBug("clang_analyzer_isTainted() requires exactly one argument", C);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
const bool IsTainted =
|
||
|
|
taint::isTainted(C.getState(), CE->getArg(0), C.getLocationContext());
|
||
|
|
reportBug(IsTainted ? "YES" : "NO", C);
|
||
|
|
}
|
||
|
|
|
||
|
|
void ento::registerExprInspectionChecker(CheckerManager &Mgr) {
|
||
|
|
Mgr.registerChecker<ExprInspectionChecker>();
|
||
|
|
}
|
||
|
|
|
||
|
|
bool ento::shouldRegisterExprInspectionChecker(const CheckerManager &mgr) {
|
||
|
|
return true;
|
||
|
|
}
|