1 //===- FuzzerTraceState.cpp - Trace-based fuzzer mutator ------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
9 // This file implements a mutation algorithm based on instruction traces and
10 // on taint analysis feedback from DFSan.
12 // Instruction traces are special hooks inserted by the compiler around
13 // interesting instructions. Currently supported traces:
14 // * __sanitizer_cov_trace_cmp -- inserted before every ICMP instruction,
15 // receives the type, size and arguments of ICMP.
17 // Every time a traced event is intercepted we analyse the data involved
18 // in the event and suggest a mutation for future executions.
19 // For example if 4 bytes of data that derive from input bytes {4,5,6,7}
20 // are compared with a constant 12345,
21 // we try to insert 12345, 12344, 12346 into bytes
22 // {4,5,6,7} of the next fuzzed inputs.
24 // The fuzzer can work only with the traces, or with both traces and DFSan.
26 // DataFlowSanitizer (DFSan) is a tool for
27 // generalised dynamic data flow (taint) analysis:
28 // http://clang.llvm.org/docs/DataFlowSanitizer.html .
30 // The approach with DFSan-based fuzzing has some similarity to
31 // "Taint-based Directed Whitebox Fuzzing"
32 // by Vijay Ganesh & Tim Leek & Martin Rinard:
33 // http://dspace.mit.edu/openaccess-disseminate/1721.1/59320,
34 // but it uses a full blown LLVM IR taint analysis and separate instrumentation
35 // to analyze all of the "attack points" at once.
37 // Workflow with DFSan:
38 // * lib/Fuzzer/Fuzzer*.cpp is compiled w/o any instrumentation.
39 // * The code under test is compiled with DFSan *and* with instruction traces.
40 // * Every call to HOOK(a,b) is replaced by DFSan with
41 // __dfsw_HOOK(a, b, label(a), label(b)) so that __dfsw_HOOK
42 // gets all the taint labels for the arguments.
43 // * At the Fuzzer startup we assign a unique DFSan label
44 // to every byte of the input string (Fuzzer::CurrentUnit) so that for any
45 // chunk of data we know which input bytes it has derived from.
46 // * The __dfsw_* functions (implemented in this file) record the
47 // parameters (i.e. the application data and the corresponding taint labels)
50 // Parts of this code will not function when DFSan is not linked in.
51 // Instead of using ifdefs and thus requiring a separate build of lib/Fuzzer
52 // we redeclare the dfsan_* interface functions as weak and check if they
53 // are nullptr before calling.
54 // If this approach proves to be useful we may add attribute(weak) to the
55 // dfsan declarations in dfsan_interface.h
57 // This module is in the "proof of concept" stage.
58 // It is capable of solving only the simplest puzzles
59 // like test/dfsan/DFSanSimpleCmpTest.cpp.
60 //===----------------------------------------------------------------------===//
62 /* Example of manual usage (-fsanitize=dataflow is optional):
65 clang -fPIC -c -g -O2 -std=c++11 Fuzzer*.cpp
66 clang++ -O0 -std=c++11 -fsanitize-coverage=edge,trace-cmp \
68 test/SimpleCmpTest.cpp Fuzzer*.o
73 #include "FuzzerDFSan.h"
74 #include "FuzzerInternal.h"
81 #if !LLVM_FUZZER_SUPPORTS_DFSAN
82 // Stubs for dfsan for platforms where dfsan does not exist and weak
83 // functions don't work.
85 dfsan_label dfsan_create_label(const char *desc, void *userdata) { return 0; }
86 void dfsan_set_label(dfsan_label label, void *addr, size_t size) {}
87 void dfsan_add_label(dfsan_label label, void *addr, size_t size) {}
88 const struct dfsan_label_info *dfsan_get_label_info(dfsan_label label) {
91 dfsan_label dfsan_read_label(const void *addr, size_t size) { return 0; }
93 #endif // !LLVM_FUZZER_SUPPORTS_DFSAN
97 // These values are copied from include/llvm/IR/InstrTypes.h.
98 // We do not include the LLVM headers here to remain independent.
99 // If these values ever change, an assertion in ComputeCmp will fail.
101 ICMP_EQ = 32, ///< equal
102 ICMP_NE = 33, ///< not equal
103 ICMP_UGT = 34, ///< unsigned greater than
104 ICMP_UGE = 35, ///< unsigned greater or equal
105 ICMP_ULT = 36, ///< unsigned less than
106 ICMP_ULE = 37, ///< unsigned less or equal
107 ICMP_SGT = 38, ///< signed greater than
108 ICMP_SGE = 39, ///< signed greater or equal
109 ICMP_SLT = 40, ///< signed less than
110 ICMP_SLE = 41, ///< signed less or equal
113 template <class U, class S>
114 bool ComputeCmp(size_t CmpType, U Arg1, U Arg2) {
116 case ICMP_EQ : return Arg1 == Arg2;
117 case ICMP_NE : return Arg1 != Arg2;
118 case ICMP_UGT: return Arg1 > Arg2;
119 case ICMP_UGE: return Arg1 >= Arg2;
120 case ICMP_ULT: return Arg1 < Arg2;
121 case ICMP_ULE: return Arg1 <= Arg2;
122 case ICMP_SGT: return (S)Arg1 > (S)Arg2;
123 case ICMP_SGE: return (S)Arg1 >= (S)Arg2;
124 case ICMP_SLT: return (S)Arg1 < (S)Arg2;
125 case ICMP_SLE: return (S)Arg1 <= (S)Arg2;
126 default: assert(0 && "unsupported CmpType");
131 static bool ComputeCmp(size_t CmpSize, size_t CmpType, uint64_t Arg1,
133 if (CmpSize == 8) return ComputeCmp<uint64_t, int64_t>(CmpType, Arg1, Arg2);
134 if (CmpSize == 4) return ComputeCmp<uint32_t, int32_t>(CmpType, Arg1, Arg2);
135 if (CmpSize == 2) return ComputeCmp<uint16_t, int16_t>(CmpType, Arg1, Arg2);
136 if (CmpSize == 1) return ComputeCmp<uint8_t, int8_t>(CmpType, Arg1, Arg2);
138 if (CmpType == ICMP_EQ) return Arg1 == Arg2;
139 // assert(0 && "unsupported cmp and type size combination");
143 // As a simplification we use the range of input bytes instead of a set of input
146 uint16_t Beg, End; // Range is [Beg, End), thus Beg==End is an empty range.
148 LabelRange(uint16_t Beg = 0, uint16_t End = 0) : Beg(Beg), End(End) {}
150 static LabelRange Join(LabelRange LR1, LabelRange LR2) {
151 if (LR1.Beg == LR1.End) return LR2;
152 if (LR2.Beg == LR2.End) return LR1;
153 return {std::min(LR1.Beg, LR2.Beg), std::max(LR1.End, LR2.End)};
155 LabelRange &Join(LabelRange LR) {
156 return *this = Join(*this, LR);
158 static LabelRange Singleton(const dfsan_label_info *LI) {
159 uint16_t Idx = (uint16_t)(uintptr_t)LI->userdata;
161 return {(uint16_t)(Idx - 1), Idx};
165 // For now, very simple: put Size bytes of Data at position Pos.
166 struct TraceBasedMutation {
167 static const size_t kMaxSize = 28;
170 uint8_t Data[kMaxSize];
173 const size_t TraceBasedMutation::kMaxSize;
177 TraceState(UserSuppliedFuzzer &USF,
178 const Fuzzer::FuzzingOptions &Options, const Unit &CurrentUnit)
179 : USF(USF), Options(Options), CurrentUnit(CurrentUnit) {
180 // Current trace collection is not thread-friendly and it probably
181 // does not have to be such, but at least we should not crash in presence
182 // of threads. So, just ignore all traces coming from all threads but one.
186 LabelRange GetLabelRange(dfsan_label L);
187 void DFSanCmpCallback(uintptr_t PC, size_t CmpSize, size_t CmpType,
188 uint64_t Arg1, uint64_t Arg2, dfsan_label L1,
190 void DFSanMemcmpCallback(size_t CmpSize, const uint8_t *Data1,
191 const uint8_t *Data2, dfsan_label L1,
193 void DFSanSwitchCallback(uint64_t PC, size_t ValSizeInBits, uint64_t Val,
194 size_t NumCases, uint64_t *Cases, dfsan_label L);
195 void TraceCmpCallback(uintptr_t PC, size_t CmpSize, size_t CmpType,
196 uint64_t Arg1, uint64_t Arg2);
197 void TraceMemcmpCallback(size_t CmpSize, const uint8_t *Data1,
198 const uint8_t *Data2);
200 void TraceSwitchCallback(uintptr_t PC, size_t ValSizeInBits, uint64_t Val,
201 size_t NumCases, uint64_t *Cases);
202 int TryToAddDesiredData(uint64_t PresentData, uint64_t DesiredData,
204 int TryToAddDesiredData(const uint8_t *PresentData,
205 const uint8_t *DesiredData, size_t DataSize);
207 void StartTraceRecording() {
208 if (!Options.UseTraces) return;
209 RecordingTraces = true;
211 USF.GetMD().ClearAutoDictionary();
214 void StopTraceRecording() {
215 if (!RecordingTraces) return;
216 RecordingTraces = false;
217 for (size_t i = 0; i < NumMutations; i++) {
218 auto &M = Mutations[i];
219 Unit U(M.Data, M.Data + M.Size);
220 if (Options.Verbosity >= 2) {
221 AutoDictUnitCounts[U]++;
223 if ((AutoDictAdds & (AutoDictAdds - 1)) == 0) {
224 typedef std::pair<size_t, Unit> CU;
225 std::vector<CU> CountedUnits;
226 for (auto &I : AutoDictUnitCounts)
227 CountedUnits.push_back(std::make_pair(I.second, I.first));
228 std::sort(CountedUnits.begin(), CountedUnits.end(),
229 [](const CU &a, const CU &b) { return a.first > b.first; });
230 Printf("AutoDict:\n");
231 for (auto &I : CountedUnits) {
232 Printf(" %zd ", I.first);
233 PrintASCII(I.second);
238 USF.GetMD().AddWordToAutoDictionary(U, M.Pos);
242 void AddMutation(uint32_t Pos, uint32_t Size, const uint8_t *Data) {
243 if (NumMutations >= kMaxMutations) return;
244 assert(Size <= TraceBasedMutation::kMaxSize);
245 auto &M = Mutations[NumMutations++];
248 memcpy(M.Data, Data, Size);
251 void AddMutation(uint32_t Pos, uint32_t Size, uint64_t Data) {
252 assert(Size <= sizeof(Data));
253 AddMutation(Pos, Size, reinterpret_cast<uint8_t*>(&Data));
257 bool IsTwoByteData(uint64_t Data) {
258 int64_t Signed = static_cast<int64_t>(Data);
260 return Signed == 0 || Signed == -1L;
262 bool RecordingTraces = false;
263 static const size_t kMaxMutations = 1 << 16;
265 TraceBasedMutation Mutations[kMaxMutations];
266 LabelRange LabelRanges[1 << (sizeof(dfsan_label) * 8)];
267 UserSuppliedFuzzer &USF;
268 const Fuzzer::FuzzingOptions &Options;
269 const Unit &CurrentUnit;
270 std::map<Unit, size_t> AutoDictUnitCounts;
271 size_t AutoDictAdds = 0;
272 static thread_local bool IsMyThread;
275 thread_local bool TraceState::IsMyThread;
277 LabelRange TraceState::GetLabelRange(dfsan_label L) {
278 LabelRange &LR = LabelRanges[L];
279 if (LR.Beg < LR.End || L == 0)
281 const dfsan_label_info *LI = dfsan_get_label_info(L);
282 if (LI->l1 || LI->l2)
283 return LR = LabelRange::Join(GetLabelRange(LI->l1), GetLabelRange(LI->l2));
284 return LR = LabelRange::Singleton(LI);
287 void TraceState::DFSanCmpCallback(uintptr_t PC, size_t CmpSize, size_t CmpType,
288 uint64_t Arg1, uint64_t Arg2, dfsan_label L1,
290 assert(ReallyHaveDFSan());
291 if (!RecordingTraces || !IsMyThread) return;
292 if (L1 == 0 && L2 == 0)
293 return; // Not actionable.
294 if (L1 != 0 && L2 != 0)
295 return; // Probably still actionable.
296 bool Res = ComputeCmp(CmpSize, CmpType, Arg1, Arg2);
297 uint64_t Data = L1 ? Arg2 : Arg1;
298 LabelRange LR = L1 ? GetLabelRange(L1) : GetLabelRange(L2);
300 for (size_t Pos = LR.Beg; Pos + CmpSize <= LR.End; Pos++) {
301 AddMutation(Pos, CmpSize, Data);
302 AddMutation(Pos, CmpSize, Data + 1);
303 AddMutation(Pos, CmpSize, Data - 1);
306 if (CmpSize > LR.End - LR.Beg)
307 AddMutation(LR.Beg, (unsigned)(LR.End - LR.Beg), Data);
310 if (Options.Verbosity >= 3)
311 Printf("DFSanCmpCallback: PC %lx S %zd T %zd A1 %llx A2 %llx R %d L1 %d L2 "
313 PC, CmpSize, CmpType, Arg1, Arg2, Res, L1, L2, NumMutations);
316 void TraceState::DFSanMemcmpCallback(size_t CmpSize, const uint8_t *Data1,
317 const uint8_t *Data2, dfsan_label L1,
320 assert(ReallyHaveDFSan());
321 if (!RecordingTraces || !IsMyThread) return;
322 if (L1 == 0 && L2 == 0)
323 return; // Not actionable.
324 if (L1 != 0 && L2 != 0)
325 return; // Probably still actionable.
327 const uint8_t *Data = L1 ? Data2 : Data1;
328 LabelRange LR = L1 ? GetLabelRange(L1) : GetLabelRange(L2);
329 for (size_t Pos = LR.Beg; Pos + CmpSize <= LR.End; Pos++) {
330 AddMutation(Pos, CmpSize, Data);
331 if (Options.Verbosity >= 3)
332 Printf("DFSanMemcmpCallback: Pos %d Size %d\n", Pos, CmpSize);
336 void TraceState::DFSanSwitchCallback(uint64_t PC, size_t ValSizeInBits,
337 uint64_t Val, size_t NumCases,
338 uint64_t *Cases, dfsan_label L) {
339 assert(ReallyHaveDFSan());
340 if (!RecordingTraces || !IsMyThread) return;
341 if (!L) return; // Not actionable.
342 LabelRange LR = GetLabelRange(L);
343 size_t ValSize = ValSizeInBits / 8;
344 bool TryShort = IsTwoByteData(Val);
345 for (size_t i = 0; i < NumCases; i++)
346 TryShort &= IsTwoByteData(Cases[i]);
348 for (size_t Pos = LR.Beg; Pos + ValSize <= LR.End; Pos++)
349 for (size_t i = 0; i < NumCases; i++)
350 AddMutation(Pos, ValSize, Cases[i]);
353 for (size_t Pos = LR.Beg; Pos + 2 <= LR.End; Pos++)
354 for (size_t i = 0; i < NumCases; i++)
355 AddMutation(Pos, 2, Cases[i]);
357 if (Options.Verbosity >= 3)
358 Printf("DFSanSwitchCallback: PC %lx Val %zd SZ %zd # %zd L %d: {%d, %d} "
360 PC, Val, ValSize, NumCases, L, LR.Beg, LR.End, TryShort);
363 int TraceState::TryToAddDesiredData(uint64_t PresentData, uint64_t DesiredData,
366 const uint8_t *Beg = CurrentUnit.data();
367 const uint8_t *End = Beg + CurrentUnit.size();
368 for (const uint8_t *Cur = Beg; Cur < End; Cur++) {
369 Cur = (uint8_t *)memmem(Cur, End - Cur, &PresentData, DataSize);
372 size_t Pos = Cur - Beg;
373 assert(Pos < CurrentUnit.size());
374 AddMutation(Pos, DataSize, DesiredData);
375 AddMutation(Pos, DataSize, DesiredData + 1);
376 AddMutation(Pos, DataSize, DesiredData - 1);
382 int TraceState::TryToAddDesiredData(const uint8_t *PresentData,
383 const uint8_t *DesiredData,
386 const uint8_t *Beg = CurrentUnit.data();
387 const uint8_t *End = Beg + CurrentUnit.size();
388 for (const uint8_t *Cur = Beg; Cur < End; Cur++) {
389 Cur = (uint8_t *)memmem(Cur, End - Cur, PresentData, DataSize);
392 size_t Pos = Cur - Beg;
393 assert(Pos < CurrentUnit.size());
394 AddMutation(Pos, DataSize, DesiredData);
400 void TraceState::TraceCmpCallback(uintptr_t PC, size_t CmpSize, size_t CmpType,
401 uint64_t Arg1, uint64_t Arg2) {
402 if (!RecordingTraces || !IsMyThread) return;
403 if ((CmpType == ICMP_EQ || CmpType == ICMP_NE) && Arg1 == Arg2)
404 return; // No reason to mutate.
406 Added += TryToAddDesiredData(Arg1, Arg2, CmpSize);
407 Added += TryToAddDesiredData(Arg2, Arg1, CmpSize);
408 if (!Added && CmpSize == 4 && IsTwoByteData(Arg1) && IsTwoByteData(Arg2)) {
409 Added += TryToAddDesiredData(Arg1, Arg2, 2);
410 Added += TryToAddDesiredData(Arg2, Arg1, 2);
412 if (Options.Verbosity >= 3 && Added)
413 Printf("TraceCmp %zd/%zd: %p %zd %zd\n", CmpSize, CmpType, PC, Arg1, Arg2);
416 void TraceState::TraceMemcmpCallback(size_t CmpSize, const uint8_t *Data1,
417 const uint8_t *Data2) {
418 if (!RecordingTraces || !IsMyThread) return;
419 CmpSize = std::min(CmpSize, TraceBasedMutation::kMaxSize);
420 int Added2 = TryToAddDesiredData(Data1, Data2, CmpSize);
421 int Added1 = TryToAddDesiredData(Data2, Data1, CmpSize);
422 if ((Added1 || Added2) && Options.Verbosity >= 3) {
423 Printf("MemCmp Added %d%d: ", Added1, Added2);
424 if (Added1) PrintASCII(Data1, CmpSize);
425 if (Added2) PrintASCII(Data2, CmpSize);
430 void TraceState::TraceSwitchCallback(uintptr_t PC, size_t ValSizeInBits,
431 uint64_t Val, size_t NumCases,
433 if (!RecordingTraces || !IsMyThread) return;
434 size_t ValSize = ValSizeInBits / 8;
435 bool TryShort = IsTwoByteData(Val);
436 for (size_t i = 0; i < NumCases; i++)
437 TryShort &= IsTwoByteData(Cases[i]);
439 if (Options.Verbosity >= 3)
440 Printf("TraceSwitch: %p %zd # %zd; TryShort %d\n", PC, Val, NumCases,
443 for (size_t i = 0; i < NumCases; i++) {
444 TryToAddDesiredData(Val, Cases[i], ValSize);
446 TryToAddDesiredData(Val, Cases[i], 2);
450 static TraceState *TS;
452 void Fuzzer::StartTraceRecording() {
454 if (ReallyHaveDFSan())
455 for (size_t i = 0; i < static_cast<size_t>(Options.MaxLen); i++)
456 dfsan_set_label(i + 1, &CurrentUnit[i], 1);
457 TS->StartTraceRecording();
460 void Fuzzer::StopTraceRecording() {
462 TS->StopTraceRecording();
465 void Fuzzer::InitializeTraceState() {
466 if (!Options.UseTraces) return;
467 TS = new TraceState(USF, Options, CurrentUnit);
468 CurrentUnit.resize(Options.MaxLen);
469 // The rest really requires DFSan.
470 if (!ReallyHaveDFSan()) return;
471 for (size_t i = 0; i < static_cast<size_t>(Options.MaxLen); i++) {
472 dfsan_label L = dfsan_create_label("input", (void*)(i + 1));
473 // We assume that no one else has called dfsan_create_label before.
475 Printf("DFSan labels are not starting from 1, exiting\n");
481 static size_t InternalStrnlen(const char *S, size_t MaxLen) {
483 for (; Len < MaxLen && S[Len]; Len++) {}
487 } // namespace fuzzer
492 void __dfsw___sanitizer_cov_trace_cmp(uint64_t SizeAndType, uint64_t Arg1,
493 uint64_t Arg2, dfsan_label L0,
494 dfsan_label L1, dfsan_label L2) {
497 uintptr_t PC = reinterpret_cast<uintptr_t>(__builtin_return_address(0));
498 uint64_t CmpSize = (SizeAndType >> 32) / 8;
499 uint64_t Type = (SizeAndType << 32) >> 32;
500 TS->DFSanCmpCallback(PC, CmpSize, Type, Arg1, Arg2, L1, L2);
503 void __dfsw___sanitizer_cov_trace_switch(uint64_t Val, uint64_t *Cases,
504 dfsan_label L1, dfsan_label L2) {
506 uintptr_t PC = reinterpret_cast<uintptr_t>(__builtin_return_address(0));
507 TS->DFSanSwitchCallback(PC, Cases[1], Val, Cases[0], Cases+2, L1);
510 void dfsan_weak_hook_memcmp(void *caller_pc, const void *s1, const void *s2,
511 size_t n, dfsan_label s1_label,
512 dfsan_label s2_label, dfsan_label n_label) {
514 dfsan_label L1 = dfsan_read_label(s1, n);
515 dfsan_label L2 = dfsan_read_label(s2, n);
516 TS->DFSanMemcmpCallback(n, reinterpret_cast<const uint8_t *>(s1),
517 reinterpret_cast<const uint8_t *>(s2), L1, L2);
520 void dfsan_weak_hook_strncmp(void *caller_pc, const char *s1, const char *s2,
521 size_t n, dfsan_label s1_label,
522 dfsan_label s2_label, dfsan_label n_label) {
524 n = std::min(n, fuzzer::InternalStrnlen(s1, n));
525 n = std::min(n, fuzzer::InternalStrnlen(s2, n));
526 dfsan_label L1 = dfsan_read_label(s1, n);
527 dfsan_label L2 = dfsan_read_label(s2, n);
528 TS->DFSanMemcmpCallback(n, reinterpret_cast<const uint8_t *>(s1),
529 reinterpret_cast<const uint8_t *>(s2), L1, L2);
532 void dfsan_weak_hook_strcmp(void *caller_pc, const char *s1, const char *s2,
533 dfsan_label s1_label, dfsan_label s2_label) {
535 size_t Len1 = strlen(s1);
536 size_t Len2 = strlen(s2);
537 size_t N = std::min(Len1, Len2);
538 if (N <= 1) return; // Not interesting.
539 dfsan_label L1 = dfsan_read_label(s1, Len1);
540 dfsan_label L2 = dfsan_read_label(s2, Len2);
541 TS->DFSanMemcmpCallback(N, reinterpret_cast<const uint8_t *>(s1),
542 reinterpret_cast<const uint8_t *>(s2), L1, L2);
545 // We may need to avoid defining weak hooks to stay compatible with older clang.
546 #ifndef LLVM_FUZZER_DEFINES_SANITIZER_WEAK_HOOOKS
547 # define LLVM_FUZZER_DEFINES_SANITIZER_WEAK_HOOOKS 1
550 #if LLVM_FUZZER_DEFINES_SANITIZER_WEAK_HOOOKS
551 void __sanitizer_weak_hook_memcmp(void *caller_pc, const void *s1,
552 const void *s2, size_t n, int result) {
554 if (result == 0) return; // No reason to mutate.
555 if (n <= 1) return; // Not interesting.
556 TS->TraceMemcmpCallback(n, reinterpret_cast<const uint8_t *>(s1),
557 reinterpret_cast<const uint8_t *>(s2));
560 void __sanitizer_weak_hook_strncmp(void *caller_pc, const char *s1,
561 const char *s2, size_t n, int result) {
563 if (result == 0) return; // No reason to mutate.
564 size_t Len1 = fuzzer::InternalStrnlen(s1, n);
565 size_t Len2 = fuzzer::InternalStrnlen(s2, n);
566 n = std::min(n, Len1);
567 n = std::min(n, Len2);
568 if (n <= 1) return; // Not interesting.
569 TS->TraceMemcmpCallback(n, reinterpret_cast<const uint8_t *>(s1),
570 reinterpret_cast<const uint8_t *>(s2));
573 void __sanitizer_weak_hook_strcmp(void *caller_pc, const char *s1,
574 const char *s2, int result) {
576 if (result == 0) return; // No reason to mutate.
577 size_t Len1 = strlen(s1);
578 size_t Len2 = strlen(s2);
579 size_t N = std::min(Len1, Len2);
580 if (N <= 1) return; // Not interesting.
581 TS->TraceMemcmpCallback(N, reinterpret_cast<const uint8_t *>(s1),
582 reinterpret_cast<const uint8_t *>(s2));
585 #endif // LLVM_FUZZER_DEFINES_SANITIZER_WEAK_HOOOKS
587 __attribute__((visibility("default")))
588 void __sanitizer_cov_trace_cmp(uint64_t SizeAndType, uint64_t Arg1,
591 uintptr_t PC = reinterpret_cast<uintptr_t>(__builtin_return_address(0));
592 uint64_t CmpSize = (SizeAndType >> 32) / 8;
593 uint64_t Type = (SizeAndType << 32) >> 32;
594 TS->TraceCmpCallback(PC, CmpSize, Type, Arg1, Arg2);
597 __attribute__((visibility("default")))
598 void __sanitizer_cov_trace_switch(uint64_t Val, uint64_t *Cases) {
600 uintptr_t PC = reinterpret_cast<uintptr_t>(__builtin_return_address(0));
601 TS->TraceSwitchCallback(PC, Cases[1], Val, Cases[0], Cases + 2);