From 0b57cec536236d46e3dba9bd041533462f33dbb7 Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Fri, 20 Dec 2019 19:53:05 +0000
Subject: Move all sources from the llvm project into contrib/llvm-project.

This uses the new layout of the upstream repository, which was recently
migrated to GitHub, and converted into a "monorepo".  That is, most of
the earlier separate sub-projects with their own branches and tags were
consolidated into one top-level directory, and are now branched and
tagged together.

Updating the vendor area to match this layout is next.
---
 .../Checkers/MmapWriteExecChecker.cpp              | 93 ----------------------
 1 file changed, 93 deletions(-)
 delete mode 100644 contrib/llvm/tools/clang/lib/StaticAnalyzer/Checkers/MmapWriteExecChecker.cpp

(limited to 'contrib/llvm/tools/clang/lib/StaticAnalyzer/Checkers/MmapWriteExecChecker.cpp')

diff --git a/contrib/llvm/tools/clang/lib/StaticAnalyzer/Checkers/MmapWriteExecChecker.cpp b/contrib/llvm/tools/clang/lib/StaticAnalyzer/Checkers/MmapWriteExecChecker.cpp
deleted file mode 100644
index 270efede8385..000000000000
--- a/contrib/llvm/tools/clang/lib/StaticAnalyzer/Checkers/MmapWriteExecChecker.cpp
+++ /dev/null
@@ -1,93 +0,0 @@
-// MmapWriteExecChecker.cpp - Check for the prot argument -----------------===//
-//
-// 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 checker tests the 3rd argument of mmap's calls to check if
-// it is writable and executable in the same time. It's somehow
-// an optional checker since for example in JIT libraries it is pretty common.
-//
-//===----------------------------------------------------------------------===//
-
-#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/CallEvent.h"
-#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
-
-using namespace clang;
-using namespace ento;
-using llvm::APSInt;
-
-namespace {
-class MmapWriteExecChecker : public Checker<check::PreCall> {
-  CallDescription MmapFn;
-  CallDescription MprotectFn;
-  static int ProtWrite;
-  static int ProtExec;
-  static int ProtRead;
-  mutable std::unique_ptr<BugType> BT;
-public:
-  MmapWriteExecChecker() : MmapFn("mmap", 6), MprotectFn("mprotect", 3) {}
-  void checkPreCall(const CallEvent &Call, CheckerContext &C) const;
-  int ProtExecOv;
-  int ProtReadOv;
-};
-}
-
-int MmapWriteExecChecker::ProtWrite = 0x02;
-int MmapWriteExecChecker::ProtExec  = 0x04;
-int MmapWriteExecChecker::ProtRead  = 0x01;
-
-void MmapWriteExecChecker::checkPreCall(const CallEvent &Call,
-                                         CheckerContext &C) const {
-  if (Call.isCalled(MmapFn) || Call.isCalled(MprotectFn)) {
-    SVal ProtVal = Call.getArgSVal(2);
-    Optional<nonloc::ConcreteInt> ProtLoc = ProtVal.getAs<nonloc::ConcreteInt>();
-    int64_t Prot = ProtLoc->getValue().getSExtValue();
-    if (ProtExecOv != ProtExec)
-      ProtExec = ProtExecOv;
-    if (ProtReadOv != ProtRead)
-      ProtRead = ProtReadOv;
-
-    // Wrong settings
-    if (ProtRead == ProtExec)
-      return;
-
-    if ((Prot & (ProtWrite | ProtExec)) == (ProtWrite | ProtExec)) {
-      if (!BT)
-        BT.reset(new BugType(this, "W^X check fails, Write Exec prot flags set", "Security"));
-
-      ExplodedNode *N = C.generateNonFatalErrorNode();
-      if (!N)
-        return;
-
-      auto Report = llvm::make_unique<BugReport>(
-          *BT, "Both PROT_WRITE and PROT_EXEC flags are set. This can "
-               "lead to exploitable memory regions, which could be overwritten "
-               "with malicious code", N);
-      Report->addRange(Call.getArgSourceRange(2));
-      C.emitReport(std::move(Report));
-    }
-  }
-}
-
-void ento::registerMmapWriteExecChecker(CheckerManager &mgr) {
-  MmapWriteExecChecker *Mwec =
-      mgr.registerChecker<MmapWriteExecChecker>();
-  Mwec->ProtExecOv =
-    mgr.getAnalyzerOptions()
-      .getCheckerIntegerOption(Mwec, "MmapProtExec");
-  Mwec->ProtReadOv =
-    mgr.getAnalyzerOptions()
-      .getCheckerIntegerOption(Mwec, "MmapProtRead");
-}
-
-bool ento::shouldRegisterMmapWriteExecChecker(const LangOptions &LO) {
-  return true;
-}
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