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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
107 lines
4.6 KiB
C++
107 lines
4.6 KiB
C++
//===--- SanitizerMetadata.cpp - Blacklist for sanitizers -----------------===//
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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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//
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// Class which emits metadata consumed by sanitizer instrumentation passes.
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//
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//===----------------------------------------------------------------------===//
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#include "SanitizerMetadata.h"
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#include "CodeGenModule.h"
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#include "clang/AST/Type.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/IR/Constants.h"
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using namespace clang;
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using namespace CodeGen;
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SanitizerMetadata::SanitizerMetadata(CodeGenModule &CGM) : CGM(CGM) {}
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void SanitizerMetadata::reportGlobalToASan(llvm::GlobalVariable *GV,
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SourceLocation Loc, StringRef Name,
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QualType Ty, bool IsDynInit,
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bool IsBlacklisted) {
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if (!CGM.getLangOpts().Sanitize.hasOneOf(SanitizerKind::Address |
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SanitizerKind::KernelAddress |
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SanitizerKind::HWAddress |
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SanitizerKind::KernelHWAddress))
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return;
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IsDynInit &= !CGM.isInSanitizerBlacklist(GV, Loc, Ty, "init");
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IsBlacklisted |= CGM.isInSanitizerBlacklist(GV, Loc, Ty);
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llvm::Metadata *LocDescr = nullptr;
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llvm::Metadata *GlobalName = nullptr;
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llvm::LLVMContext &VMContext = CGM.getLLVMContext();
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if (!IsBlacklisted) {
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// Don't generate source location and global name if it is blacklisted -
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// it won't be instrumented anyway.
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LocDescr = getLocationMetadata(Loc);
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if (!Name.empty())
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GlobalName = llvm::MDString::get(VMContext, Name);
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}
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llvm::Metadata *GlobalMetadata[] = {
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llvm::ConstantAsMetadata::get(GV), LocDescr, GlobalName,
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llvm::ConstantAsMetadata::get(
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llvm::ConstantInt::get(llvm::Type::getInt1Ty(VMContext), IsDynInit)),
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llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
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llvm::Type::getInt1Ty(VMContext), IsBlacklisted))};
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llvm::MDNode *ThisGlobal = llvm::MDNode::get(VMContext, GlobalMetadata);
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llvm::NamedMDNode *AsanGlobals =
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CGM.getModule().getOrInsertNamedMetadata("llvm.asan.globals");
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AsanGlobals->addOperand(ThisGlobal);
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}
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void SanitizerMetadata::reportGlobalToASan(llvm::GlobalVariable *GV,
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const VarDecl &D, bool IsDynInit) {
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if (!CGM.getLangOpts().Sanitize.hasOneOf(SanitizerKind::Address |
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SanitizerKind::KernelAddress |
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SanitizerKind::HWAddress |
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SanitizerKind::KernelHWAddress))
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return;
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std::string QualName;
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llvm::raw_string_ostream OS(QualName);
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D.printQualifiedName(OS);
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bool IsBlacklisted = false;
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for (auto Attr : D.specific_attrs<NoSanitizeAttr>())
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if (Attr->getMask() & SanitizerKind::Address)
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IsBlacklisted = true;
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reportGlobalToASan(GV, D.getLocation(), OS.str(), D.getType(), IsDynInit,
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IsBlacklisted);
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}
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void SanitizerMetadata::disableSanitizerForGlobal(llvm::GlobalVariable *GV) {
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// For now, just make sure the global is not modified by the ASan
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// instrumentation.
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if (CGM.getLangOpts().Sanitize.hasOneOf(SanitizerKind::Address |
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SanitizerKind::KernelAddress |
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SanitizerKind::HWAddress |
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SanitizerKind::KernelHWAddress))
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reportGlobalToASan(GV, SourceLocation(), "", QualType(), false, true);
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}
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void SanitizerMetadata::disableSanitizerForInstruction(llvm::Instruction *I) {
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I->setMetadata(CGM.getModule().getMDKindID("nosanitize"),
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llvm::MDNode::get(CGM.getLLVMContext(), None));
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}
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llvm::MDNode *SanitizerMetadata::getLocationMetadata(SourceLocation Loc) {
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PresumedLoc PLoc = CGM.getContext().getSourceManager().getPresumedLoc(Loc);
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if (!PLoc.isValid())
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return nullptr;
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llvm::LLVMContext &VMContext = CGM.getLLVMContext();
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llvm::Metadata *LocMetadata[] = {
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llvm::MDString::get(VMContext, PLoc.getFilename()),
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llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
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llvm::Type::getInt32Ty(VMContext), PLoc.getLine())),
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llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
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llvm::Type::getInt32Ty(VMContext), PLoc.getColumn())),
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};
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return llvm::MDNode::get(VMContext, LocMetadata);
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}
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