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1 //===--- SanitizerArgs.cpp - Arguments for sanitizer tools  ---------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 #include "clang/Driver/SanitizerArgs.h"
10 #include "clang/Driver/Driver.h"
11 #include "clang/Driver/DriverDiagnostic.h"
12 #include "clang/Driver/Options.h"
13 #include "clang/Driver/ToolChain.h"
14 #include "llvm/ADT/StringExtras.h"
15 #include "llvm/ADT/StringSwitch.h"
16 #include "llvm/Support/FileSystem.h"
17 #include "llvm/Support/Path.h"
18 #include "llvm/Support/SpecialCaseList.h"
19 #include <memory>
20
21 using namespace clang::driver;
22 using namespace llvm::opt;
23
24 void SanitizerArgs::clear() {
25   Kind = 0;
26   BlacklistFile = "";
27   MsanTrackOrigins = 0;
28   AsanZeroBaseShadow = false;
29   UbsanTrapOnError = false;
30   AsanSharedRuntime = false;
31 }
32
33 SanitizerArgs::SanitizerArgs() {
34   clear();
35 }
36
37 SanitizerArgs::SanitizerArgs(const ToolChain &TC,
38                              const llvm::opt::ArgList &Args) {
39   clear();
40   unsigned AllAdd = 0;  // All kinds of sanitizers that were turned on
41                         // at least once (possibly, disabled further).
42   unsigned AllRemove = 0;  // During the loop below, the accumulated set of
43                            // sanitizers disabled by the current sanitizer
44                            // argument or any argument after it.
45   unsigned DiagnosedKinds = 0;  // All Kinds we have diagnosed up to now.
46                                 // Used to deduplicate diagnostics.
47   const Driver &D = TC.getDriver();
48   for (ArgList::const_reverse_iterator I = Args.rbegin(), E = Args.rend();
49        I != E; ++I) {
50     unsigned Add, Remove;
51     if (!parse(D, Args, *I, Add, Remove, true))
52       continue;
53     (*I)->claim();
54
55     AllAdd |= expandGroups(Add);
56     AllRemove |= expandGroups(Remove);
57
58     // Avoid diagnosing any sanitizer which is disabled later.
59     Add &= ~AllRemove;
60     // At this point we have not expanded groups, so any unsupported sanitizers
61     // in Add are those which have been explicitly enabled. Diagnose them.
62     Add = filterUnsupportedKinds(TC, Add, Args, *I, /*DiagnoseErrors=*/true,
63                                  DiagnosedKinds);
64     Add = expandGroups(Add);
65     // Group expansion may have enabled a sanitizer which is disabled later.
66     Add &= ~AllRemove;
67     // Silently discard any unsupported sanitizers implicitly enabled through
68     // group expansion.
69     Add = filterUnsupportedKinds(TC, Add, Args, *I, /*DiagnoseErrors=*/false,
70                                  DiagnosedKinds);
71
72     Kind |= Add;
73   }
74
75   UbsanTrapOnError =
76     Args.hasFlag(options::OPT_fsanitize_undefined_trap_on_error,
77                  options::OPT_fno_sanitize_undefined_trap_on_error, false);
78
79   // Warn about undefined sanitizer options that require runtime support.
80   if (UbsanTrapOnError && notAllowedWithTrap()) {
81     D.Diag(diag::err_drv_argument_not_allowed_with)
82       << lastArgumentForKind(D, Args, NotAllowedWithTrap)
83       << "-fsanitize-undefined-trap-on-error";
84   }
85
86   // Only one runtime library can be used at once.
87   bool NeedsAsan = needsAsanRt();
88   bool NeedsTsan = needsTsanRt();
89   bool NeedsMsan = needsMsanRt();
90   bool NeedsLsan = needsLeakDetection();
91   if (NeedsAsan && NeedsTsan)
92     D.Diag(diag::err_drv_argument_not_allowed_with)
93       << lastArgumentForKind(D, Args, NeedsAsanRt)
94       << lastArgumentForKind(D, Args, NeedsTsanRt);
95   if (NeedsAsan && NeedsMsan)
96     D.Diag(diag::err_drv_argument_not_allowed_with)
97       << lastArgumentForKind(D, Args, NeedsAsanRt)
98       << lastArgumentForKind(D, Args, NeedsMsanRt);
99   if (NeedsTsan && NeedsMsan)
100     D.Diag(diag::err_drv_argument_not_allowed_with)
101       << lastArgumentForKind(D, Args, NeedsTsanRt)
102       << lastArgumentForKind(D, Args, NeedsMsanRt);
103   if (NeedsLsan && NeedsTsan)
104     D.Diag(diag::err_drv_argument_not_allowed_with)
105       << lastArgumentForKind(D, Args, NeedsLeakDetection)
106       << lastArgumentForKind(D, Args, NeedsTsanRt);
107   if (NeedsLsan && NeedsMsan)
108     D.Diag(diag::err_drv_argument_not_allowed_with)
109       << lastArgumentForKind(D, Args, NeedsLeakDetection)
110       << lastArgumentForKind(D, Args, NeedsMsanRt);
111   // FIXME: Currently -fsanitize=leak is silently ignored in the presence of
112   // -fsanitize=address. Perhaps it should print an error, or perhaps
113   // -f(-no)sanitize=leak should change whether leak detection is enabled by
114   // default in ASan?
115
116   // Parse -f(no-)sanitize-blacklist options.
117   if (Arg *BLArg = Args.getLastArg(options::OPT_fsanitize_blacklist,
118                                    options::OPT_fno_sanitize_blacklist)) {
119     if (BLArg->getOption().matches(options::OPT_fsanitize_blacklist)) {
120       std::string BLPath = BLArg->getValue();
121       if (llvm::sys::fs::exists(BLPath)) {
122         // Validate the blacklist format.
123         std::string BLError;
124         std::unique_ptr<llvm::SpecialCaseList> SCL(
125             llvm::SpecialCaseList::create(BLPath, BLError));
126         if (!SCL.get())
127           D.Diag(diag::err_drv_malformed_sanitizer_blacklist) << BLError;
128         else
129           BlacklistFile = BLPath;
130       } else {
131         D.Diag(diag::err_drv_no_such_file) << BLPath;
132       }
133     }
134   } else {
135     // If no -fsanitize-blacklist option is specified, try to look up for
136     // blacklist in the resource directory.
137     std::string BLPath;
138     if (getDefaultBlacklistForKind(D, Kind, BLPath) &&
139         llvm::sys::fs::exists(BLPath))
140       BlacklistFile = BLPath;
141   }
142
143   // Parse -f[no-]sanitize-memory-track-origins[=level] options.
144   if (NeedsMsan) {
145     if (Arg *A =
146             Args.getLastArg(options::OPT_fsanitize_memory_track_origins_EQ,
147                             options::OPT_fsanitize_memory_track_origins,
148                             options::OPT_fno_sanitize_memory_track_origins)) {
149       if (A->getOption().matches(options::OPT_fsanitize_memory_track_origins)) {
150         MsanTrackOrigins = 1;
151       } else if (A->getOption().matches(
152                      options::OPT_fno_sanitize_memory_track_origins)) {
153         MsanTrackOrigins = 0;
154       } else {
155         StringRef S = A->getValue();
156         if (S.getAsInteger(0, MsanTrackOrigins) || MsanTrackOrigins < 0 ||
157             MsanTrackOrigins > 2) {
158           D.Diag(diag::err_drv_invalid_value) << A->getAsString(Args) << S;
159         }
160       }
161     }
162   }
163
164   if (NeedsAsan) {
165     AsanSharedRuntime =
166         Args.hasArg(options::OPT_shared_libasan) ||
167         (TC.getTriple().getEnvironment() == llvm::Triple::Android);
168     AsanZeroBaseShadow =
169         (TC.getTriple().getEnvironment() == llvm::Triple::Android);
170   }
171 }
172
173 void SanitizerArgs::addArgs(const llvm::opt::ArgList &Args,
174                             llvm::opt::ArgStringList &CmdArgs) const {
175   if (!Kind)
176     return;
177   SmallString<256> SanitizeOpt("-fsanitize=");
178 #define SANITIZER(NAME, ID) \
179   if (Kind & ID) \
180     SanitizeOpt += NAME ",";
181 #include "clang/Basic/Sanitizers.def"
182   SanitizeOpt.pop_back();
183   CmdArgs.push_back(Args.MakeArgString(SanitizeOpt));
184   if (!BlacklistFile.empty()) {
185     SmallString<64> BlacklistOpt("-fsanitize-blacklist=");
186     BlacklistOpt += BlacklistFile;
187     CmdArgs.push_back(Args.MakeArgString(BlacklistOpt));
188   }
189
190   if (MsanTrackOrigins)
191     CmdArgs.push_back(Args.MakeArgString("-fsanitize-memory-track-origins=" +
192                                          llvm::utostr(MsanTrackOrigins)));
193
194   // Workaround for PR16386.
195   if (needsMsanRt())
196     CmdArgs.push_back(Args.MakeArgString("-fno-assume-sane-operator-new"));
197 }
198
199 unsigned SanitizerArgs::parse(const char *Value) {
200   unsigned ParsedKind = llvm::StringSwitch<SanitizeKind>(Value)
201 #define SANITIZER(NAME, ID) .Case(NAME, ID)
202 #define SANITIZER_GROUP(NAME, ID, ALIAS) .Case(NAME, ID##Group)
203 #include "clang/Basic/Sanitizers.def"
204     .Default(SanitizeKind());
205   return ParsedKind;
206 }
207
208 unsigned SanitizerArgs::expandGroups(unsigned Kinds) {
209 #define SANITIZER(NAME, ID)
210 #define SANITIZER_GROUP(NAME, ID, ALIAS) if (Kinds & ID##Group) Kinds |= ID;
211 #include "clang/Basic/Sanitizers.def"
212   return Kinds;
213 }
214
215 void SanitizerArgs::filterUnsupportedMask(const ToolChain &TC, unsigned &Kinds,
216                                           unsigned Mask,
217                                           const llvm::opt::ArgList &Args,
218                                           const llvm::opt::Arg *A,
219                                           bool DiagnoseErrors,
220                                           unsigned &DiagnosedKinds) {
221   unsigned MaskedKinds = Kinds & Mask;
222   if (!MaskedKinds)
223     return;
224   Kinds &= ~Mask;
225   // Do we have new kinds to diagnose?
226   if (DiagnoseErrors && (DiagnosedKinds & MaskedKinds) != MaskedKinds) {
227     // Only diagnose the new kinds.
228     std::string Desc =
229         describeSanitizeArg(Args, A, MaskedKinds & ~DiagnosedKinds);
230     TC.getDriver().Diag(diag::err_drv_unsupported_opt_for_target)
231         << Desc << TC.getTriple().str();
232     DiagnosedKinds |= MaskedKinds;
233   }
234 }
235
236 unsigned SanitizerArgs::filterUnsupportedKinds(const ToolChain &TC,
237                                                unsigned Kinds,
238                                                const llvm::opt::ArgList &Args,
239                                                const llvm::opt::Arg *A,
240                                                bool DiagnoseErrors,
241                                                unsigned &DiagnosedKinds) {
242   bool IsLinux = TC.getTriple().getOS() == llvm::Triple::Linux;
243   bool IsX86 = TC.getTriple().getArch() == llvm::Triple::x86;
244   bool IsX86_64 = TC.getTriple().getArch() == llvm::Triple::x86_64;
245   if (!(IsLinux && IsX86_64)) {
246     filterUnsupportedMask(TC, Kinds, Thread | Memory | DataFlow, Args, A,
247                           DiagnoseErrors, DiagnosedKinds);
248   }
249   if (!(IsLinux && (IsX86 || IsX86_64))) {
250     filterUnsupportedMask(TC, Kinds, Function, Args, A, DiagnoseErrors,
251                           DiagnosedKinds);
252   }
253   return Kinds;
254 }
255
256 unsigned SanitizerArgs::parse(const Driver &D, const llvm::opt::Arg *A,
257                               bool DiagnoseErrors) {
258   unsigned Kind = 0;
259   for (unsigned I = 0, N = A->getNumValues(); I != N; ++I) {
260     if (unsigned K = parse(A->getValue(I)))
261       Kind |= K;
262     else if (DiagnoseErrors)
263       D.Diag(diag::err_drv_unsupported_option_argument)
264         << A->getOption().getName() << A->getValue(I);
265   }
266   return Kind;
267 }
268
269 bool SanitizerArgs::parse(const Driver &D, const llvm::opt::ArgList &Args,
270                           const llvm::opt::Arg *A, unsigned &Add,
271                           unsigned &Remove, bool DiagnoseErrors) {
272   Add = 0;
273   Remove = 0;
274   if (A->getOption().matches(options::OPT_fsanitize_EQ)) {
275     Add = parse(D, A, DiagnoseErrors);
276   } else if (A->getOption().matches(options::OPT_fno_sanitize_EQ)) {
277     Remove = parse(D, A, DiagnoseErrors);
278   } else {
279     // Flag is not relevant to sanitizers.
280     return false;
281   }
282   return true;
283 }
284
285 std::string SanitizerArgs::lastArgumentForKind(const Driver &D,
286                                                const llvm::opt::ArgList &Args,
287                                                unsigned Kind) {
288   for (llvm::opt::ArgList::const_reverse_iterator I = Args.rbegin(),
289                                                   E = Args.rend();
290        I != E; ++I) {
291     unsigned Add, Remove;
292     if (parse(D, Args, *I, Add, Remove, false) &&
293         (expandGroups(Add) & Kind))
294       return describeSanitizeArg(Args, *I, Kind);
295     Kind &= ~Remove;
296   }
297   llvm_unreachable("arg list didn't provide expected value");
298 }
299
300 std::string SanitizerArgs::describeSanitizeArg(const llvm::opt::ArgList &Args,
301                                                const llvm::opt::Arg *A,
302                                                unsigned Mask) {
303   if (!A->getOption().matches(options::OPT_fsanitize_EQ))
304     return A->getAsString(Args);
305
306   std::string Sanitizers;
307   for (unsigned I = 0, N = A->getNumValues(); I != N; ++I) {
308     if (expandGroups(parse(A->getValue(I))) & Mask) {
309       if (!Sanitizers.empty())
310         Sanitizers += ",";
311       Sanitizers += A->getValue(I);
312     }
313   }
314
315   assert(!Sanitizers.empty() && "arg didn't provide expected value");
316   return "-fsanitize=" + Sanitizers;
317 }
318
319 bool SanitizerArgs::getDefaultBlacklistForKind(const Driver &D, unsigned Kind,
320                                                std::string &BLPath) {
321   const char *BlacklistFile = nullptr;
322   if (Kind & NeedsAsanRt)
323     BlacklistFile = "asan_blacklist.txt";
324   else if (Kind & NeedsMsanRt)
325     BlacklistFile = "msan_blacklist.txt";
326   else if (Kind & NeedsTsanRt)
327     BlacklistFile = "tsan_blacklist.txt";
328   else if (Kind & NeedsDfsanRt)
329     BlacklistFile = "dfsan_abilist.txt";
330
331   if (BlacklistFile) {
332     SmallString<64> Path(D.ResourceDir);
333     llvm::sys::path::append(Path, BlacklistFile);
334     BLPath = Path.str();
335     return true;
336   }
337   return false;
338 }