/
SanitizerArgs.cpp
1330 lines (1192 loc) · 55.8 KB
/
SanitizerArgs.cpp
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//===--- SanitizerArgs.cpp - Arguments for sanitizer tools ---------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "clang/Driver/SanitizerArgs.h"
#include "ToolChains/CommonArgs.h"
#include "clang/Basic/Sanitizers.h"
#include "clang/Driver/Driver.h"
#include "clang/Driver/DriverDiagnostic.h"
#include "clang/Driver/Options.h"
#include "clang/Driver/ToolChain.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/SpecialCaseList.h"
#include "llvm/Support/TargetParser.h"
#include "llvm/Support/VirtualFileSystem.h"
#include "llvm/Transforms/Instrumentation/AddressSanitizerOptions.h"
#include <memory>
using namespace clang;
using namespace clang::driver;
using namespace llvm::opt;
static const SanitizerMask NeedsUbsanRt =
SanitizerKind::Undefined | SanitizerKind::Integer |
SanitizerKind::ImplicitConversion | SanitizerKind::Nullability |
SanitizerKind::CFI | SanitizerKind::FloatDivideByZero |
SanitizerKind::ObjCCast;
static const SanitizerMask NeedsUbsanCxxRt =
SanitizerKind::Vptr | SanitizerKind::CFI;
static const SanitizerMask NotAllowedWithTrap = SanitizerKind::Vptr;
static const SanitizerMask NotAllowedWithMinimalRuntime =
SanitizerKind::Function | SanitizerKind::Vptr;
static const SanitizerMask RequiresPIE =
SanitizerKind::DataFlow | SanitizerKind::HWAddress | SanitizerKind::Scudo;
static const SanitizerMask NeedsUnwindTables =
SanitizerKind::Address | SanitizerKind::HWAddress | SanitizerKind::Thread |
SanitizerKind::Memory | SanitizerKind::DataFlow;
static const SanitizerMask SupportsCoverage =
SanitizerKind::Address | SanitizerKind::HWAddress |
SanitizerKind::KernelAddress | SanitizerKind::KernelHWAddress |
SanitizerKind::MemTag | SanitizerKind::Memory |
SanitizerKind::KernelMemory | SanitizerKind::Leak |
SanitizerKind::Undefined | SanitizerKind::Integer | SanitizerKind::Bounds |
SanitizerKind::ImplicitConversion | SanitizerKind::Nullability |
SanitizerKind::DataFlow | SanitizerKind::Fuzzer |
SanitizerKind::FuzzerNoLink | SanitizerKind::FloatDivideByZero |
SanitizerKind::SafeStack | SanitizerKind::ShadowCallStack |
SanitizerKind::Thread | SanitizerKind::ObjCCast;
static const SanitizerMask RecoverableByDefault =
SanitizerKind::Undefined | SanitizerKind::Integer |
SanitizerKind::ImplicitConversion | SanitizerKind::Nullability |
SanitizerKind::FloatDivideByZero | SanitizerKind::ObjCCast;
static const SanitizerMask Unrecoverable =
SanitizerKind::Unreachable | SanitizerKind::Return;
static const SanitizerMask AlwaysRecoverable =
SanitizerKind::KernelAddress | SanitizerKind::KernelHWAddress;
static const SanitizerMask NeedsLTO = SanitizerKind::CFI;
static const SanitizerMask TrappingSupported =
(SanitizerKind::Undefined & ~SanitizerKind::Vptr) | SanitizerKind::Integer |
SanitizerKind::Nullability | SanitizerKind::LocalBounds |
SanitizerKind::CFI | SanitizerKind::FloatDivideByZero |
SanitizerKind::ObjCCast;
static const SanitizerMask TrappingDefault = SanitizerKind::CFI;
static const SanitizerMask CFIClasses =
SanitizerKind::CFIVCall | SanitizerKind::CFINVCall |
SanitizerKind::CFIMFCall | SanitizerKind::CFIDerivedCast |
SanitizerKind::CFIUnrelatedCast;
static const SanitizerMask CompatibleWithMinimalRuntime =
TrappingSupported | SanitizerKind::Scudo | SanitizerKind::ShadowCallStack |
SanitizerKind::MemTag;
enum CoverageFeature {
CoverageFunc = 1 << 0,
CoverageBB = 1 << 1,
CoverageEdge = 1 << 2,
CoverageIndirCall = 1 << 3,
CoverageTraceBB = 1 << 4, // Deprecated.
CoverageTraceCmp = 1 << 5,
CoverageTraceDiv = 1 << 6,
CoverageTraceGep = 1 << 7,
Coverage8bitCounters = 1 << 8, // Deprecated.
CoverageTracePC = 1 << 9,
CoverageTracePCGuard = 1 << 10,
CoverageNoPrune = 1 << 11,
CoverageInline8bitCounters = 1 << 12,
CoveragePCTable = 1 << 13,
CoverageStackDepth = 1 << 14,
CoverageInlineBoolFlag = 1 << 15,
CoverageTraceLoads = 1 << 16,
CoverageTraceStores = 1 << 17,
};
/// Parse a -fsanitize= or -fno-sanitize= argument's values, diagnosing any
/// invalid components. Returns a SanitizerMask.
static SanitizerMask parseArgValues(const Driver &D, const llvm::opt::Arg *A,
bool DiagnoseErrors);
/// Parse -f(no-)?sanitize-coverage= flag values, diagnosing any invalid
/// components. Returns OR of members of \c CoverageFeature enumeration.
static int parseCoverageFeatures(const Driver &D, const llvm::opt::Arg *A,
bool DiagnoseErrors);
/// Produce an argument string from ArgList \p Args, which shows how it
/// provides some sanitizer kind from \p Mask. For example, the argument list
/// "-fsanitize=thread,vptr -fsanitize=address" with mask \c NeedsUbsanRt
/// would produce "-fsanitize=vptr".
static std::string lastArgumentForMask(const Driver &D,
const llvm::opt::ArgList &Args,
SanitizerMask Mask);
/// Produce an argument string from argument \p A, which shows how it provides
/// a value in \p Mask. For instance, the argument
/// "-fsanitize=address,alignment" with mask \c NeedsUbsanRt would produce
/// "-fsanitize=alignment".
static std::string describeSanitizeArg(const llvm::opt::Arg *A,
SanitizerMask Mask);
/// Produce a string containing comma-separated names of sanitizers in \p
/// Sanitizers set.
static std::string toString(const clang::SanitizerSet &Sanitizers);
static void validateSpecialCaseListFormat(const Driver &D,
std::vector<std::string> &SCLFiles,
unsigned MalformedSCLErrorDiagID,
bool DiagnoseErrors) {
if (SCLFiles.empty())
return;
std::string BLError;
std::unique_ptr<llvm::SpecialCaseList> SCL(
llvm::SpecialCaseList::create(SCLFiles, D.getVFS(), BLError));
if (!SCL.get() && DiagnoseErrors)
D.Diag(MalformedSCLErrorDiagID) << BLError;
}
static void addDefaultIgnorelists(const Driver &D, SanitizerMask Kinds,
std::vector<std::string> &IgnorelistFiles,
bool DiagnoseErrors) {
struct Ignorelist {
const char *File;
SanitizerMask Mask;
} Ignorelists[] = {{"asan_ignorelist.txt", SanitizerKind::Address},
{"hwasan_ignorelist.txt", SanitizerKind::HWAddress},
{"memtag_ignorelist.txt", SanitizerKind::MemTag},
{"msan_ignorelist.txt", SanitizerKind::Memory},
{"tsan_ignorelist.txt", SanitizerKind::Thread},
{"dfsan_abilist.txt", SanitizerKind::DataFlow},
{"cfi_ignorelist.txt", SanitizerKind::CFI},
{"ubsan_ignorelist.txt",
SanitizerKind::Undefined | SanitizerKind::Integer |
SanitizerKind::Nullability |
SanitizerKind::FloatDivideByZero}};
for (auto BL : Ignorelists) {
if (!(Kinds & BL.Mask))
continue;
clang::SmallString<64> Path(D.ResourceDir);
llvm::sys::path::append(Path, "share", BL.File);
if (D.getVFS().exists(Path))
IgnorelistFiles.push_back(std::string(Path.str()));
else if (BL.Mask == SanitizerKind::CFI && DiagnoseErrors)
// If cfi_ignorelist.txt cannot be found in the resource dir, driver
// should fail.
D.Diag(clang::diag::err_drv_no_such_file) << Path;
}
validateSpecialCaseListFormat(
D, IgnorelistFiles, clang::diag::err_drv_malformed_sanitizer_ignorelist,
DiagnoseErrors);
}
/// Parse -f(no-)?sanitize-(coverage-)?(white|ignore)list argument's values,
/// diagnosing any invalid file paths and validating special case list format.
static void parseSpecialCaseListArg(const Driver &D,
const llvm::opt::ArgList &Args,
std::vector<std::string> &SCLFiles,
llvm::opt::OptSpecifier SCLOptionID,
llvm::opt::OptSpecifier NoSCLOptionID,
unsigned MalformedSCLErrorDiagID,
bool DiagnoseErrors) {
for (const auto *Arg : Args) {
// Match -fsanitize-(coverage-)?(white|ignore)list.
if (Arg->getOption().matches(SCLOptionID)) {
Arg->claim();
std::string SCLPath = Arg->getValue();
if (D.getVFS().exists(SCLPath)) {
SCLFiles.push_back(SCLPath);
} else if (DiagnoseErrors) {
D.Diag(clang::diag::err_drv_no_such_file) << SCLPath;
}
// Match -fno-sanitize-ignorelist.
} else if (Arg->getOption().matches(NoSCLOptionID)) {
Arg->claim();
SCLFiles.clear();
}
}
validateSpecialCaseListFormat(D, SCLFiles, MalformedSCLErrorDiagID,
DiagnoseErrors);
}
/// Sets group bits for every group that has at least one representative already
/// enabled in \p Kinds.
static SanitizerMask setGroupBits(SanitizerMask Kinds) {
#define SANITIZER(NAME, ID)
#define SANITIZER_GROUP(NAME, ID, ALIAS) \
if (Kinds & SanitizerKind::ID) \
Kinds |= SanitizerKind::ID##Group;
#include "clang/Basic/Sanitizers.def"
return Kinds;
}
static SanitizerMask parseSanitizeTrapArgs(const Driver &D,
const llvm::opt::ArgList &Args,
bool DiagnoseErrors) {
SanitizerMask TrapRemove; // During the loop below, the accumulated set of
// sanitizers disabled by the current sanitizer
// argument or any argument after it.
SanitizerMask TrappingKinds;
SanitizerMask TrappingSupportedWithGroups = setGroupBits(TrappingSupported);
for (const llvm::opt::Arg *Arg : llvm::reverse(Args)) {
if (Arg->getOption().matches(options::OPT_fsanitize_trap_EQ)) {
Arg->claim();
SanitizerMask Add = parseArgValues(D, Arg, true);
Add &= ~TrapRemove;
SanitizerMask InvalidValues = Add & ~TrappingSupportedWithGroups;
if (InvalidValues && DiagnoseErrors) {
SanitizerSet S;
S.Mask = InvalidValues;
D.Diag(diag::err_drv_unsupported_option_argument) << "-fsanitize-trap"
<< toString(S);
}
TrappingKinds |= expandSanitizerGroups(Add) & ~TrapRemove;
} else if (Arg->getOption().matches(options::OPT_fno_sanitize_trap_EQ)) {
Arg->claim();
TrapRemove |=
expandSanitizerGroups(parseArgValues(D, Arg, DiagnoseErrors));
}
}
// Apply default trapping behavior.
TrappingKinds |= TrappingDefault & ~TrapRemove;
return TrappingKinds;
}
bool SanitizerArgs::needsFuzzerInterceptors() const {
return needsFuzzer() && !needsAsanRt() && !needsTsanRt() && !needsMsanRt();
}
bool SanitizerArgs::needsUbsanRt() const {
// All of these include ubsan.
if (needsAsanRt() || needsMsanRt() || needsHwasanRt() || needsTsanRt() ||
needsDfsanRt() || needsLsanRt() || needsCfiDiagRt() ||
(needsScudoRt() && !requiresMinimalRuntime()))
return false;
return (Sanitizers.Mask & NeedsUbsanRt & ~TrapSanitizers.Mask) ||
CoverageFeatures;
}
bool SanitizerArgs::needsCfiRt() const {
return !(Sanitizers.Mask & SanitizerKind::CFI & ~TrapSanitizers.Mask) &&
CfiCrossDso && !ImplicitCfiRuntime;
}
bool SanitizerArgs::needsCfiDiagRt() const {
return (Sanitizers.Mask & SanitizerKind::CFI & ~TrapSanitizers.Mask) &&
CfiCrossDso && !ImplicitCfiRuntime;
}
bool SanitizerArgs::requiresPIE() const {
return NeedPIE || (Sanitizers.Mask & RequiresPIE);
}
bool SanitizerArgs::needsUnwindTables() const {
return static_cast<bool>(Sanitizers.Mask & NeedsUnwindTables);
}
bool SanitizerArgs::needsLTO() const {
return static_cast<bool>(Sanitizers.Mask & NeedsLTO);
}
SanitizerArgs::SanitizerArgs(const ToolChain &TC,
const llvm::opt::ArgList &Args,
bool DiagnoseErrors) {
SanitizerMask AllRemove; // During the loop below, the accumulated set of
// sanitizers disabled by the current sanitizer
// argument or any argument after it.
SanitizerMask AllAddedKinds; // Mask of all sanitizers ever enabled by
// -fsanitize= flags (directly or via group
// expansion), some of which may be disabled
// later. Used to carefully prune
// unused-argument diagnostics.
SanitizerMask DiagnosedKinds; // All Kinds we have diagnosed up to now.
// Used to deduplicate diagnostics.
SanitizerMask Kinds;
const SanitizerMask Supported = setGroupBits(TC.getSupportedSanitizers());
CfiCrossDso = Args.hasFlag(options::OPT_fsanitize_cfi_cross_dso,
options::OPT_fno_sanitize_cfi_cross_dso, false);
ToolChain::RTTIMode RTTIMode = TC.getRTTIMode();
const Driver &D = TC.getDriver();
SanitizerMask TrappingKinds = parseSanitizeTrapArgs(D, Args, DiagnoseErrors);
SanitizerMask InvalidTrappingKinds = TrappingKinds & NotAllowedWithTrap;
MinimalRuntime =
Args.hasFlag(options::OPT_fsanitize_minimal_runtime,
options::OPT_fno_sanitize_minimal_runtime, MinimalRuntime);
// The object size sanitizer should not be enabled at -O0.
Arg *OptLevel = Args.getLastArg(options::OPT_O_Group);
bool RemoveObjectSizeAtO0 =
!OptLevel || OptLevel->getOption().matches(options::OPT_O0);
for (const llvm::opt::Arg *Arg : llvm::reverse(Args)) {
if (Arg->getOption().matches(options::OPT_fsanitize_EQ)) {
Arg->claim();
SanitizerMask Add = parseArgValues(D, Arg, DiagnoseErrors);
if (RemoveObjectSizeAtO0) {
AllRemove |= SanitizerKind::ObjectSize;
// The user explicitly enabled the object size sanitizer. Warn
// that this does nothing at -O0.
if ((Add & SanitizerKind::ObjectSize) && DiagnoseErrors)
D.Diag(diag::warn_drv_object_size_disabled_O0)
<< Arg->getAsString(Args);
}
AllAddedKinds |= expandSanitizerGroups(Add);
// Avoid diagnosing any sanitizer which is disabled later.
Add &= ~AllRemove;
// At this point we have not expanded groups, so any unsupported
// sanitizers in Add are those which have been explicitly enabled.
// Diagnose them.
if (SanitizerMask KindsToDiagnose =
Add & InvalidTrappingKinds & ~DiagnosedKinds) {
if (DiagnoseErrors) {
std::string Desc = describeSanitizeArg(Arg, KindsToDiagnose);
D.Diag(diag::err_drv_argument_not_allowed_with)
<< Desc << "-fsanitize-trap=undefined";
}
DiagnosedKinds |= KindsToDiagnose;
}
Add &= ~InvalidTrappingKinds;
if (MinimalRuntime) {
if (SanitizerMask KindsToDiagnose =
Add & NotAllowedWithMinimalRuntime & ~DiagnosedKinds) {
if (DiagnoseErrors) {
std::string Desc = describeSanitizeArg(Arg, KindsToDiagnose);
D.Diag(diag::err_drv_argument_not_allowed_with)
<< Desc << "-fsanitize-minimal-runtime";
}
DiagnosedKinds |= KindsToDiagnose;
}
Add &= ~NotAllowedWithMinimalRuntime;
}
// FIXME: Make CFI on member function calls compatible with cross-DSO CFI.
// There are currently two problems:
// - Virtual function call checks need to pass a pointer to the function
// address to llvm.type.test and a pointer to the address point to the
// diagnostic function. Currently we pass the same pointer to both
// places.
// - Non-virtual function call checks may need to check multiple type
// identifiers.
// Fixing both of those may require changes to the cross-DSO CFI
// interface.
if (CfiCrossDso && (Add & SanitizerKind::CFIMFCall & ~DiagnosedKinds)) {
if (DiagnoseErrors)
D.Diag(diag::err_drv_argument_not_allowed_with)
<< "-fsanitize=cfi-mfcall"
<< "-fsanitize-cfi-cross-dso";
Add &= ~SanitizerKind::CFIMFCall;
DiagnosedKinds |= SanitizerKind::CFIMFCall;
}
if (SanitizerMask KindsToDiagnose = Add & ~Supported & ~DiagnosedKinds) {
if (DiagnoseErrors) {
std::string Desc = describeSanitizeArg(Arg, KindsToDiagnose);
D.Diag(diag::err_drv_unsupported_opt_for_target)
<< Desc << TC.getTriple().str();
}
DiagnosedKinds |= KindsToDiagnose;
}
Add &= Supported;
// Test for -fno-rtti + explicit -fsanitizer=vptr before expanding groups
// so we don't error out if -fno-rtti and -fsanitize=undefined were
// passed.
if ((Add & SanitizerKind::Vptr) && (RTTIMode == ToolChain::RM_Disabled)) {
if (const llvm::opt::Arg *NoRTTIArg = TC.getRTTIArg()) {
assert(NoRTTIArg->getOption().matches(options::OPT_fno_rtti) &&
"RTTI disabled without -fno-rtti option?");
// The user explicitly passed -fno-rtti with -fsanitize=vptr, but
// the vptr sanitizer requires RTTI, so this is a user error.
if (DiagnoseErrors)
D.Diag(diag::err_drv_argument_not_allowed_with)
<< "-fsanitize=vptr" << NoRTTIArg->getAsString(Args);
} else {
// The vptr sanitizer requires RTTI, but RTTI is disabled (by
// default). Warn that the vptr sanitizer is being disabled.
if (DiagnoseErrors)
D.Diag(diag::warn_drv_disabling_vptr_no_rtti_default);
}
// Take out the Vptr sanitizer from the enabled sanitizers
AllRemove |= SanitizerKind::Vptr;
}
Add = expandSanitizerGroups(Add);
// Group expansion may have enabled a sanitizer which is disabled later.
Add &= ~AllRemove;
// Silently discard any unsupported sanitizers implicitly enabled through
// group expansion.
Add &= ~InvalidTrappingKinds;
if (MinimalRuntime) {
Add &= ~NotAllowedWithMinimalRuntime;
}
if (CfiCrossDso)
Add &= ~SanitizerKind::CFIMFCall;
Add &= Supported;
if (Add & SanitizerKind::Fuzzer)
Add |= SanitizerKind::FuzzerNoLink;
// Enable coverage if the fuzzing flag is set.
if (Add & SanitizerKind::FuzzerNoLink) {
CoverageFeatures |= CoverageInline8bitCounters | CoverageIndirCall |
CoverageTraceCmp | CoveragePCTable;
// Due to TLS differences, stack depth tracking is only enabled on Linux
if (TC.getTriple().isOSLinux())
CoverageFeatures |= CoverageStackDepth;
}
Kinds |= Add;
} else if (Arg->getOption().matches(options::OPT_fno_sanitize_EQ)) {
Arg->claim();
SanitizerMask Remove = parseArgValues(D, Arg, DiagnoseErrors);
AllRemove |= expandSanitizerGroups(Remove);
}
}
std::pair<SanitizerMask, SanitizerMask> IncompatibleGroups[] = {
std::make_pair(SanitizerKind::Address,
SanitizerKind::Thread | SanitizerKind::Memory),
std::make_pair(SanitizerKind::Thread, SanitizerKind::Memory),
std::make_pair(SanitizerKind::Leak,
SanitizerKind::Thread | SanitizerKind::Memory),
std::make_pair(SanitizerKind::KernelAddress,
SanitizerKind::Address | SanitizerKind::Leak |
SanitizerKind::Thread | SanitizerKind::Memory),
std::make_pair(SanitizerKind::HWAddress,
SanitizerKind::Address | SanitizerKind::Thread |
SanitizerKind::Memory | SanitizerKind::KernelAddress),
std::make_pair(SanitizerKind::Scudo,
SanitizerKind::Address | SanitizerKind::HWAddress |
SanitizerKind::Leak | SanitizerKind::Thread |
SanitizerKind::Memory | SanitizerKind::KernelAddress),
std::make_pair(SanitizerKind::SafeStack,
(TC.getTriple().isOSFuchsia() ? SanitizerMask()
: SanitizerKind::Leak) |
SanitizerKind::Address | SanitizerKind::HWAddress |
SanitizerKind::Thread | SanitizerKind::Memory |
SanitizerKind::KernelAddress),
std::make_pair(SanitizerKind::KernelHWAddress,
SanitizerKind::Address | SanitizerKind::HWAddress |
SanitizerKind::Leak | SanitizerKind::Thread |
SanitizerKind::Memory | SanitizerKind::KernelAddress |
SanitizerKind::SafeStack),
std::make_pair(SanitizerKind::KernelMemory,
SanitizerKind::Address | SanitizerKind::HWAddress |
SanitizerKind::Leak | SanitizerKind::Thread |
SanitizerKind::Memory | SanitizerKind::KernelAddress |
SanitizerKind::Scudo | SanitizerKind::SafeStack),
std::make_pair(SanitizerKind::MemTag,
SanitizerKind::Address | SanitizerKind::KernelAddress |
SanitizerKind::HWAddress |
SanitizerKind::KernelHWAddress)};
// Enable toolchain specific default sanitizers if not explicitly disabled.
SanitizerMask Default = TC.getDefaultSanitizers() & ~AllRemove;
// Disable default sanitizers that are incompatible with explicitly requested
// ones.
for (auto G : IncompatibleGroups) {
SanitizerMask Group = G.first;
if ((Default & Group) && (Kinds & G.second))
Default &= ~Group;
}
Kinds |= Default;
// We disable the vptr sanitizer if it was enabled by group expansion but RTTI
// is disabled.
if ((Kinds & SanitizerKind::Vptr) && (RTTIMode == ToolChain::RM_Disabled)) {
Kinds &= ~SanitizerKind::Vptr;
}
// Check that LTO is enabled if we need it.
if ((Kinds & NeedsLTO) && !D.isUsingLTO() && DiagnoseErrors) {
D.Diag(diag::err_drv_argument_only_allowed_with)
<< lastArgumentForMask(D, Args, Kinds & NeedsLTO) << "-flto";
}
if ((Kinds & SanitizerKind::ShadowCallStack) &&
((TC.getTriple().isAArch64() &&
!llvm::AArch64::isX18ReservedByDefault(TC.getTriple())) ||
TC.getTriple().isRISCV()) &&
!Args.hasArg(options::OPT_ffixed_x18) && DiagnoseErrors) {
D.Diag(diag::err_drv_argument_only_allowed_with)
<< lastArgumentForMask(D, Args, Kinds & SanitizerKind::ShadowCallStack)
<< "-ffixed-x18";
}
// Report error if there are non-trapping sanitizers that require
// c++abi-specific parts of UBSan runtime, and they are not provided by the
// toolchain. We don't have a good way to check the latter, so we just
// check if the toolchan supports vptr.
if (~Supported & SanitizerKind::Vptr) {
SanitizerMask KindsToDiagnose = Kinds & ~TrappingKinds & NeedsUbsanCxxRt;
// The runtime library supports the Microsoft C++ ABI, but only well enough
// for CFI. FIXME: Remove this once we support vptr on Windows.
if (TC.getTriple().isOSWindows())
KindsToDiagnose &= ~SanitizerKind::CFI;
if (KindsToDiagnose) {
SanitizerSet S;
S.Mask = KindsToDiagnose;
if (DiagnoseErrors)
D.Diag(diag::err_drv_unsupported_opt_for_target)
<< ("-fno-sanitize-trap=" + toString(S)) << TC.getTriple().str();
Kinds &= ~KindsToDiagnose;
}
}
// Warn about incompatible groups of sanitizers.
for (auto G : IncompatibleGroups) {
SanitizerMask Group = G.first;
if (Kinds & Group) {
if (SanitizerMask Incompatible = Kinds & G.second) {
if (DiagnoseErrors)
D.Diag(clang::diag::err_drv_argument_not_allowed_with)
<< lastArgumentForMask(D, Args, Group)
<< lastArgumentForMask(D, Args, Incompatible);
Kinds &= ~Incompatible;
}
}
}
// FIXME: Currently -fsanitize=leak is silently ignored in the presence of
// -fsanitize=address. Perhaps it should print an error, or perhaps
// -f(-no)sanitize=leak should change whether leak detection is enabled by
// default in ASan?
// Parse -f(no-)?sanitize-recover flags.
SanitizerMask RecoverableKinds = RecoverableByDefault | AlwaysRecoverable;
SanitizerMask DiagnosedUnrecoverableKinds;
SanitizerMask DiagnosedAlwaysRecoverableKinds;
for (const auto *Arg : Args) {
if (Arg->getOption().matches(options::OPT_fsanitize_recover_EQ)) {
SanitizerMask Add = parseArgValues(D, Arg, DiagnoseErrors);
// Report error if user explicitly tries to recover from unrecoverable
// sanitizer.
if (SanitizerMask KindsToDiagnose =
Add & Unrecoverable & ~DiagnosedUnrecoverableKinds) {
SanitizerSet SetToDiagnose;
SetToDiagnose.Mask |= KindsToDiagnose;
if (DiagnoseErrors)
D.Diag(diag::err_drv_unsupported_option_argument)
<< Arg->getOption().getName() << toString(SetToDiagnose);
DiagnosedUnrecoverableKinds |= KindsToDiagnose;
}
RecoverableKinds |= expandSanitizerGroups(Add);
Arg->claim();
} else if (Arg->getOption().matches(options::OPT_fno_sanitize_recover_EQ)) {
SanitizerMask Remove = parseArgValues(D, Arg, DiagnoseErrors);
// Report error if user explicitly tries to disable recovery from
// always recoverable sanitizer.
if (SanitizerMask KindsToDiagnose =
Remove & AlwaysRecoverable & ~DiagnosedAlwaysRecoverableKinds) {
SanitizerSet SetToDiagnose;
SetToDiagnose.Mask |= KindsToDiagnose;
if (DiagnoseErrors)
D.Diag(diag::err_drv_unsupported_option_argument)
<< Arg->getOption().getName() << toString(SetToDiagnose);
DiagnosedAlwaysRecoverableKinds |= KindsToDiagnose;
}
RecoverableKinds &= ~expandSanitizerGroups(Remove);
Arg->claim();
}
}
RecoverableKinds &= Kinds;
RecoverableKinds &= ~Unrecoverable;
TrappingKinds &= Kinds;
RecoverableKinds &= ~TrappingKinds;
// Setup ignorelist files.
// Add default ignorelist from resource directory for activated sanitizers,
// and validate special case lists format.
if (!Args.hasArgNoClaim(options::OPT_fno_sanitize_ignorelist))
addDefaultIgnorelists(D, Kinds, SystemIgnorelistFiles, DiagnoseErrors);
// Parse -f(no-)?sanitize-ignorelist options.
// This also validates special case lists format.
parseSpecialCaseListArg(
D, Args, UserIgnorelistFiles, options::OPT_fsanitize_ignorelist_EQ,
options::OPT_fno_sanitize_ignorelist,
clang::diag::err_drv_malformed_sanitizer_ignorelist, DiagnoseErrors);
// Parse -f[no-]sanitize-memory-track-origins[=level] options.
if (AllAddedKinds & SanitizerKind::Memory) {
if (Arg *A =
Args.getLastArg(options::OPT_fsanitize_memory_track_origins_EQ,
options::OPT_fsanitize_memory_track_origins,
options::OPT_fno_sanitize_memory_track_origins)) {
if (A->getOption().matches(options::OPT_fsanitize_memory_track_origins)) {
MsanTrackOrigins = 2;
} else if (A->getOption().matches(
options::OPT_fno_sanitize_memory_track_origins)) {
MsanTrackOrigins = 0;
} else {
StringRef S = A->getValue();
if (S.getAsInteger(0, MsanTrackOrigins) || MsanTrackOrigins < 0 ||
MsanTrackOrigins > 2) {
if (DiagnoseErrors)
D.Diag(clang::diag::err_drv_invalid_value)
<< A->getAsString(Args) << S;
}
}
}
MsanUseAfterDtor =
Args.hasFlag(options::OPT_fsanitize_memory_use_after_dtor,
options::OPT_fno_sanitize_memory_use_after_dtor,
MsanUseAfterDtor);
NeedPIE |= !(TC.getTriple().isOSLinux() &&
TC.getTriple().getArch() == llvm::Triple::x86_64);
} else {
MsanUseAfterDtor = false;
}
if (AllAddedKinds & SanitizerKind::Thread) {
TsanMemoryAccess = Args.hasFlag(
options::OPT_fsanitize_thread_memory_access,
options::OPT_fno_sanitize_thread_memory_access, TsanMemoryAccess);
TsanFuncEntryExit = Args.hasFlag(
options::OPT_fsanitize_thread_func_entry_exit,
options::OPT_fno_sanitize_thread_func_entry_exit, TsanFuncEntryExit);
TsanAtomics =
Args.hasFlag(options::OPT_fsanitize_thread_atomics,
options::OPT_fno_sanitize_thread_atomics, TsanAtomics);
}
if (AllAddedKinds & SanitizerKind::CFI) {
// Without PIE, external function address may resolve to a PLT record, which
// can not be verified by the target module.
NeedPIE |= CfiCrossDso;
CfiICallGeneralizePointers =
Args.hasArg(options::OPT_fsanitize_cfi_icall_generalize_pointers);
if (CfiCrossDso && CfiICallGeneralizePointers && DiagnoseErrors)
D.Diag(diag::err_drv_argument_not_allowed_with)
<< "-fsanitize-cfi-cross-dso"
<< "-fsanitize-cfi-icall-generalize-pointers";
CfiCanonicalJumpTables =
Args.hasFlag(options::OPT_fsanitize_cfi_canonical_jump_tables,
options::OPT_fno_sanitize_cfi_canonical_jump_tables, true);
}
Stats = Args.hasFlag(options::OPT_fsanitize_stats,
options::OPT_fno_sanitize_stats, false);
if (MinimalRuntime) {
SanitizerMask IncompatibleMask =
Kinds & ~setGroupBits(CompatibleWithMinimalRuntime);
if (IncompatibleMask && DiagnoseErrors)
D.Diag(clang::diag::err_drv_argument_not_allowed_with)
<< "-fsanitize-minimal-runtime"
<< lastArgumentForMask(D, Args, IncompatibleMask);
SanitizerMask NonTrappingCfi = Kinds & SanitizerKind::CFI & ~TrappingKinds;
if (NonTrappingCfi && DiagnoseErrors)
D.Diag(clang::diag::err_drv_argument_only_allowed_with)
<< "fsanitize-minimal-runtime"
<< "fsanitize-trap=cfi";
}
// Parse -f(no-)?sanitize-coverage flags if coverage is supported by the
// enabled sanitizers.
for (const auto *Arg : Args) {
if (Arg->getOption().matches(options::OPT_fsanitize_coverage)) {
int LegacySanitizeCoverage;
if (Arg->getNumValues() == 1 &&
!StringRef(Arg->getValue(0))
.getAsInteger(0, LegacySanitizeCoverage)) {
CoverageFeatures = 0;
Arg->claim();
if (LegacySanitizeCoverage != 0 && DiagnoseErrors) {
D.Diag(diag::warn_drv_deprecated_arg)
<< Arg->getAsString(Args) << "-fsanitize-coverage=trace-pc-guard";
}
continue;
}
CoverageFeatures |= parseCoverageFeatures(D, Arg, DiagnoseErrors);
// Disable coverage and not claim the flags if there is at least one
// non-supporting sanitizer.
if (!(AllAddedKinds & ~AllRemove & ~setGroupBits(SupportsCoverage))) {
Arg->claim();
} else {
CoverageFeatures = 0;
}
} else if (Arg->getOption().matches(options::OPT_fno_sanitize_coverage)) {
Arg->claim();
CoverageFeatures &= ~parseCoverageFeatures(D, Arg, DiagnoseErrors);
}
}
// Choose at most one coverage type: function, bb, or edge.
if (DiagnoseErrors) {
if ((CoverageFeatures & CoverageFunc) && (CoverageFeatures & CoverageBB))
D.Diag(clang::diag::err_drv_argument_not_allowed_with)
<< "-fsanitize-coverage=func"
<< "-fsanitize-coverage=bb";
if ((CoverageFeatures & CoverageFunc) && (CoverageFeatures & CoverageEdge))
D.Diag(clang::diag::err_drv_argument_not_allowed_with)
<< "-fsanitize-coverage=func"
<< "-fsanitize-coverage=edge";
if ((CoverageFeatures & CoverageBB) && (CoverageFeatures & CoverageEdge))
D.Diag(clang::diag::err_drv_argument_not_allowed_with)
<< "-fsanitize-coverage=bb"
<< "-fsanitize-coverage=edge";
// Basic block tracing and 8-bit counters require some type of coverage
// enabled.
if (CoverageFeatures & CoverageTraceBB)
D.Diag(clang::diag::warn_drv_deprecated_arg)
<< "-fsanitize-coverage=trace-bb"
<< "-fsanitize-coverage=trace-pc-guard";
if (CoverageFeatures & Coverage8bitCounters)
D.Diag(clang::diag::warn_drv_deprecated_arg)
<< "-fsanitize-coverage=8bit-counters"
<< "-fsanitize-coverage=trace-pc-guard";
}
int InsertionPointTypes = CoverageFunc | CoverageBB | CoverageEdge;
int InstrumentationTypes = CoverageTracePC | CoverageTracePCGuard |
CoverageInline8bitCounters | CoverageTraceLoads |
CoverageTraceStores | CoverageInlineBoolFlag;
if ((CoverageFeatures & InsertionPointTypes) &&
!(CoverageFeatures & InstrumentationTypes) && DiagnoseErrors) {
D.Diag(clang::diag::warn_drv_deprecated_arg)
<< "-fsanitize-coverage=[func|bb|edge]"
<< "-fsanitize-coverage=[func|bb|edge],[trace-pc-guard|trace-pc]";
}
// trace-pc w/o func/bb/edge implies edge.
if (!(CoverageFeatures & InsertionPointTypes)) {
if (CoverageFeatures &
(CoverageTracePC | CoverageTracePCGuard | CoverageInline8bitCounters |
CoverageInlineBoolFlag))
CoverageFeatures |= CoverageEdge;
if (CoverageFeatures & CoverageStackDepth)
CoverageFeatures |= CoverageFunc;
}
// Parse -fsanitize-coverage-(ignore|white)list options if coverage enabled.
// This also validates special case lists format.
// Here, OptSpecifier() acts as a never-matching command-line argument.
// So, there is no way to clear coverage lists but you can append to them.
if (CoverageFeatures) {
parseSpecialCaseListArg(
D, Args, CoverageAllowlistFiles,
options::OPT_fsanitize_coverage_allowlist, OptSpecifier(),
clang::diag::err_drv_malformed_sanitizer_coverage_allowlist,
DiagnoseErrors);
parseSpecialCaseListArg(
D, Args, CoverageIgnorelistFiles,
options::OPT_fsanitize_coverage_ignorelist, OptSpecifier(),
clang::diag::err_drv_malformed_sanitizer_coverage_ignorelist,
DiagnoseErrors);
}
SharedRuntime =
Args.hasFlag(options::OPT_shared_libsan, options::OPT_static_libsan,
TC.getTriple().isAndroid() || TC.getTriple().isOSFuchsia() ||
TC.getTriple().isOSDarwin());
ImplicitCfiRuntime = TC.getTriple().isAndroid();
if (AllAddedKinds & SanitizerKind::Address) {
NeedPIE |= TC.getTriple().isOSFuchsia();
if (Arg *A =
Args.getLastArg(options::OPT_fsanitize_address_field_padding)) {
StringRef S = A->getValue();
// Legal values are 0 and 1, 2, but in future we may add more levels.
if ((S.getAsInteger(0, AsanFieldPadding) || AsanFieldPadding < 0 ||
AsanFieldPadding > 2) &&
DiagnoseErrors) {
D.Diag(clang::diag::err_drv_invalid_value) << A->getAsString(Args) << S;
}
}
if (Arg *WindowsDebugRTArg =
Args.getLastArg(options::OPT__SLASH_MTd, options::OPT__SLASH_MT,
options::OPT__SLASH_MDd, options::OPT__SLASH_MD,
options::OPT__SLASH_LDd, options::OPT__SLASH_LD)) {
switch (WindowsDebugRTArg->getOption().getID()) {
case options::OPT__SLASH_MTd:
case options::OPT__SLASH_MDd:
case options::OPT__SLASH_LDd:
if (DiagnoseErrors) {
D.Diag(clang::diag::err_drv_argument_not_allowed_with)
<< WindowsDebugRTArg->getAsString(Args)
<< lastArgumentForMask(D, Args, SanitizerKind::Address);
D.Diag(clang::diag::note_drv_address_sanitizer_debug_runtime);
}
}
}
AsanUseAfterScope = Args.hasFlag(
options::OPT_fsanitize_address_use_after_scope,
options::OPT_fno_sanitize_address_use_after_scope, AsanUseAfterScope);
AsanPoisonCustomArrayCookie = Args.hasFlag(
options::OPT_fsanitize_address_poison_custom_array_cookie,
options::OPT_fno_sanitize_address_poison_custom_array_cookie,
AsanPoisonCustomArrayCookie);
AsanOutlineInstrumentation =
Args.hasFlag(options::OPT_fsanitize_address_outline_instrumentation,
options::OPT_fno_sanitize_address_outline_instrumentation,
AsanOutlineInstrumentation);
// As a workaround for a bug in gold 2.26 and earlier, dead stripping of
// globals in ASan is disabled by default on ELF targets.
// See https://sourceware.org/bugzilla/show_bug.cgi?id=19002
AsanGlobalsDeadStripping =
!TC.getTriple().isOSBinFormatELF() || TC.getTriple().isOSFuchsia() ||
TC.getTriple().isPS4() ||
Args.hasArg(options::OPT_fsanitize_address_globals_dead_stripping);
AsanUseOdrIndicator =
Args.hasFlag(options::OPT_fsanitize_address_use_odr_indicator,
options::OPT_fno_sanitize_address_use_odr_indicator,
AsanUseOdrIndicator);
if (AllAddedKinds & SanitizerKind::PointerCompare & ~AllRemove) {
AsanInvalidPointerCmp = true;
}
if (AllAddedKinds & SanitizerKind::PointerSubtract & ~AllRemove) {
AsanInvalidPointerSub = true;
}
if (TC.getTriple().isOSDarwin() &&
(Args.hasArg(options::OPT_mkernel) ||
Args.hasArg(options::OPT_fapple_kext))) {
AsanDtorKind = llvm::AsanDtorKind::None;
}
if (const auto *Arg =
Args.getLastArg(options::OPT_sanitize_address_destructor_EQ)) {
auto parsedAsanDtorKind = AsanDtorKindFromString(Arg->getValue());
if (parsedAsanDtorKind == llvm::AsanDtorKind::Invalid && DiagnoseErrors) {
TC.getDriver().Diag(clang::diag::err_drv_unsupported_option_argument)
<< Arg->getOption().getName() << Arg->getValue();
}
AsanDtorKind = parsedAsanDtorKind;
}
if (const auto *Arg = Args.getLastArg(
options::OPT_sanitize_address_use_after_return_EQ)) {
auto parsedAsanUseAfterReturn =
AsanDetectStackUseAfterReturnModeFromString(Arg->getValue());
if (parsedAsanUseAfterReturn ==
llvm::AsanDetectStackUseAfterReturnMode::Invalid &&
DiagnoseErrors) {
TC.getDriver().Diag(clang::diag::err_drv_unsupported_option_argument)
<< Arg->getOption().getName() << Arg->getValue();
}
AsanUseAfterReturn = parsedAsanUseAfterReturn;
}
} else {
AsanUseAfterScope = false;
// -fsanitize=pointer-compare/pointer-subtract requires -fsanitize=address.
SanitizerMask DetectInvalidPointerPairs =
SanitizerKind::PointerCompare | SanitizerKind::PointerSubtract;
if ((AllAddedKinds & DetectInvalidPointerPairs & ~AllRemove) &&
DiagnoseErrors) {
TC.getDriver().Diag(clang::diag::err_drv_argument_only_allowed_with)
<< lastArgumentForMask(D, Args,
SanitizerKind::PointerCompare |
SanitizerKind::PointerSubtract)
<< "-fsanitize=address";
}
}
if (AllAddedKinds & SanitizerKind::HWAddress) {
if (Arg *HwasanAbiArg =
Args.getLastArg(options::OPT_fsanitize_hwaddress_abi_EQ)) {
HwasanAbi = HwasanAbiArg->getValue();
if (HwasanAbi != "platform" && HwasanAbi != "interceptor" &&
DiagnoseErrors)
D.Diag(clang::diag::err_drv_invalid_value)
<< HwasanAbiArg->getAsString(Args) << HwasanAbi;
} else {
HwasanAbi = "interceptor";
}
if (TC.getTriple().getArch() == llvm::Triple::x86_64)
HwasanUseAliases = Args.hasFlag(
options::OPT_fsanitize_hwaddress_experimental_aliasing,
options::OPT_fno_sanitize_hwaddress_experimental_aliasing,
HwasanUseAliases);
}
if (AllAddedKinds & SanitizerKind::SafeStack) {
// SafeStack runtime is built into the system on Android and Fuchsia.
SafeStackRuntime =
!TC.getTriple().isAndroid() && !TC.getTriple().isOSFuchsia();
}
LinkRuntimes =
Args.hasFlag(options::OPT_fsanitize_link_runtime,
options::OPT_fno_sanitize_link_runtime, LinkRuntimes);
// Parse -link-cxx-sanitizer flag.
LinkCXXRuntimes = Args.hasArg(options::OPT_fsanitize_link_cxx_runtime,
options::OPT_fno_sanitize_link_cxx_runtime,
LinkCXXRuntimes) ||
D.CCCIsCXX();
NeedsMemProfRt = Args.hasFlag(options::OPT_fmemory_profile,
options::OPT_fmemory_profile_EQ,
options::OPT_fno_memory_profile, false);
// Finally, initialize the set of available and recoverable sanitizers.
Sanitizers.Mask |= Kinds;
RecoverableSanitizers.Mask |= RecoverableKinds;
TrapSanitizers.Mask |= TrappingKinds;
assert(!(RecoverableKinds & TrappingKinds) &&
"Overlap between recoverable and trapping sanitizers");
}
static std::string toString(const clang::SanitizerSet &Sanitizers) {
std::string Res;
#define SANITIZER(NAME, ID) \
if (Sanitizers.has(SanitizerKind::ID)) { \
if (!Res.empty()) \
Res += ","; \
Res += NAME; \
}
#include "clang/Basic/Sanitizers.def"
return Res;
}
static void addSpecialCaseListOpt(const llvm::opt::ArgList &Args,
llvm::opt::ArgStringList &CmdArgs,
const char *SCLOptFlag,
const std::vector<std::string> &SCLFiles) {
for (const auto &SCLPath : SCLFiles) {
SmallString<64> SCLOpt(SCLOptFlag);
SCLOpt += SCLPath;
CmdArgs.push_back(Args.MakeArgString(SCLOpt));
}
}
static void addIncludeLinkerOption(const ToolChain &TC,
const llvm::opt::ArgList &Args,
llvm::opt::ArgStringList &CmdArgs,
StringRef SymbolName) {
SmallString<64> LinkerOptionFlag;
LinkerOptionFlag = "--linker-option=/include:";
if (TC.getTriple().getArch() == llvm::Triple::x86) {
// Win32 mangles C function names with a '_' prefix.
LinkerOptionFlag += '_';
}
LinkerOptionFlag += SymbolName;
CmdArgs.push_back(Args.MakeArgString(LinkerOptionFlag));
}
static bool hasTargetFeatureMTE(const llvm::opt::ArgStringList &CmdArgs) {
for (auto Start = CmdArgs.begin(), End = CmdArgs.end(); Start != End; ++Start) {
auto It = std::find(Start, End, StringRef("+mte"));
if (It == End)
break;
if (It > Start && *std::prev(It) == StringRef("-target-feature"))
return true;
Start = It;
}
return false;