1 //===- FuzzerTracePC.cpp - PC tracing--------------------------------------===//
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 //===----------------------------------------------------------------------===//
10 // This module implements __sanitizer_cov_trace_pc_guard[_init],
11 // the callback required for -fsanitize-coverage=trace-pc-guard instrumentation.
13 //===----------------------------------------------------------------------===//
15 #include "FuzzerTracePC.h"
16 #include "FuzzerBuiltins.h"
17 #include "FuzzerBuiltinsMsvc.h"
18 #include "FuzzerCorpus.h"
19 #include "FuzzerDefs.h"
20 #include "FuzzerDictionary.h"
21 #include "FuzzerExtFunctions.h"
23 #include "FuzzerUtil.h"
24 #include "FuzzerValueBitMap.h"
27 // The coverage counters and PCs.
28 // These are declared as global variables named "__sancov_*" to simplify
29 // experiments with inlined instrumentation.
30 alignas(64) ATTRIBUTE_INTERFACE
31 uint8_t __sancov_trace_pc_guard_8bit_counters[fuzzer::TracePC::kNumPCs];
34 uintptr_t __sancov_trace_pc_pcs[fuzzer::TracePC::kNumPCs];
36 // Used by -fsanitize-coverage=stack-depth to track stack depth
37 ATTRIBUTES_INTERFACE_TLS_INITIAL_EXEC uintptr_t __sancov_lowest_stack;
43 uint8_t *TracePC::Counters() const {
44 return __sancov_trace_pc_guard_8bit_counters;
47 uintptr_t *TracePC::PCs() const {
48 return __sancov_trace_pc_pcs;
51 size_t TracePC::GetTotalPCCoverage() {
52 if (ObservedPCs.size())
53 return ObservedPCs.size();
55 for (size_t i = 1, N = GetNumPCs(); i < N; i++)
62 void TracePC::HandleInline8bitCountersInit(uint8_t *Start, uint8_t *Stop) {
63 if (Start == Stop) return;
64 if (NumModulesWithInline8bitCounters &&
65 ModuleCounters[NumModulesWithInline8bitCounters-1].Start == Start) return;
66 assert(NumModulesWithInline8bitCounters <
67 sizeof(ModuleCounters) / sizeof(ModuleCounters[0]));
68 ModuleCounters[NumModulesWithInline8bitCounters++] = {Start, Stop};
69 NumInline8bitCounters += Stop - Start;
72 void TracePC::HandlePCsInit(const uintptr_t *Start, const uintptr_t *Stop) {
73 const PCTableEntry *B = reinterpret_cast<const PCTableEntry *>(Start);
74 const PCTableEntry *E = reinterpret_cast<const PCTableEntry *>(Stop);
75 if (NumPCTables && ModulePCTable[NumPCTables - 1].Start == B) return;
76 assert(NumPCTables < sizeof(ModulePCTable) / sizeof(ModulePCTable[0]));
77 ModulePCTable[NumPCTables++] = {B, E};
78 NumPCsInPCTables += E - B;
81 void TracePC::HandleInit(uint32_t *Start, uint32_t *Stop) {
82 if (Start == Stop || *Start) return;
83 assert(NumModules < sizeof(Modules) / sizeof(Modules[0]));
84 for (uint32_t *P = Start; P < Stop; P++) {
86 if (NumGuards == kNumPCs) {
88 "WARNING: The binary has too many instrumented PCs.\n"
89 " You may want to reduce the size of the binary\n"
90 " for more efficient fuzzing and precise coverage data\n");
92 *P = NumGuards % kNumPCs;
94 Modules[NumModules].Start = Start;
95 Modules[NumModules].Stop = Stop;
99 void TracePC::PrintModuleInfo() {
101 Printf("INFO: Loaded %zd modules (%zd guards): ", NumModules, NumGuards);
102 for (size_t i = 0; i < NumModules; i++)
103 Printf("%zd [%p, %p), ", Modules[i].Stop - Modules[i].Start,
104 Modules[i].Start, Modules[i].Stop);
107 if (NumModulesWithInline8bitCounters) {
108 Printf("INFO: Loaded %zd modules (%zd inline 8-bit counters): ",
109 NumModulesWithInline8bitCounters, NumInline8bitCounters);
110 for (size_t i = 0; i < NumModulesWithInline8bitCounters; i++)
111 Printf("%zd [%p, %p), ", ModuleCounters[i].Stop - ModuleCounters[i].Start,
112 ModuleCounters[i].Start, ModuleCounters[i].Stop);
116 Printf("INFO: Loaded %zd PC tables (%zd PCs): ", NumPCTables,
118 for (size_t i = 0; i < NumPCTables; i++) {
119 Printf("%zd [%p,%p), ", ModulePCTable[i].Stop - ModulePCTable[i].Start,
120 ModulePCTable[i].Start, ModulePCTable[i].Stop);
124 if ((NumGuards && NumGuards != NumPCsInPCTables) ||
125 (NumInline8bitCounters && NumInline8bitCounters != NumPCsInPCTables)) {
126 Printf("ERROR: The size of coverage PC tables does not match the\n"
127 "number of instrumented PCs. This might be a compiler bug,\n"
128 "please contact the libFuzzer developers.\n"
129 "Also check https://bugs.llvm.org/show_bug.cgi?id=34636\n"
130 "for possible workarounds (tl;dr: don't use the old GNU ld)\n");
134 if (size_t NumExtraCounters = ExtraCountersEnd() - ExtraCountersBegin())
135 Printf("INFO: %zd Extra Counters\n", NumExtraCounters);
138 ATTRIBUTE_NO_SANITIZE_ALL
139 void TracePC::HandleCallerCallee(uintptr_t Caller, uintptr_t Callee) {
140 const uintptr_t kBits = 12;
141 const uintptr_t kMask = (1 << kBits) - 1;
142 uintptr_t Idx = (Caller & kMask) | ((Callee & kMask) << kBits);
143 ValueProfileMap.AddValueModPrime(Idx);
146 /// \return the address of the previous instruction.
147 /// Note: the logic is copied from `sanitizer_common/sanitizer_stacktrace.h`
148 inline ALWAYS_INLINE uintptr_t GetPreviousInstructionPc(uintptr_t PC) {
150 // T32 (Thumb) branch instructions might be 16 or 32 bit long,
151 // so we return (pc-2) in that case in order to be safe.
152 // For A32 mode we return (pc-4) because all instructions are 32 bit long.
153 return (PC - 3) & (~1);
154 #elif defined(__powerpc__) || defined(__powerpc64__) || defined(__aarch64__)
155 // PCs are always 4 byte aligned.
157 #elif defined(__sparc__) || defined(__mips__)
164 /// \return the address of the next instruction.
165 /// Note: the logic is copied from `sanitizer_common/sanitizer_stacktrace.cc`
166 inline ALWAYS_INLINE uintptr_t GetNextInstructionPc(uintptr_t PC) {
167 #if defined(__mips__)
169 #elif defined(__powerpc__) || defined(__sparc__) || defined(__arm__) || \
177 void TracePC::UpdateObservedPCs() {
178 Vector<uintptr_t> CoveredFuncs;
179 auto ObservePC = [&](uintptr_t PC) {
180 if (ObservedPCs.insert(PC).second && DoPrintNewPCs) {
181 PrintPC("\tNEW_PC: %p %F %L", "\tNEW_PC: %p", GetNextInstructionPc(PC));
186 auto Observe = [&](const PCTableEntry &TE) {
188 if (++ObservedFuncs[TE.PC] == 1 && NumPrintNewFuncs)
189 CoveredFuncs.push_back(TE.PC);
193 if (NumPCsInPCTables) {
194 if (NumInline8bitCounters == NumPCsInPCTables) {
195 for (size_t i = 0; i < NumModulesWithInline8bitCounters; i++) {
196 uint8_t *Beg = ModuleCounters[i].Start;
197 size_t Size = ModuleCounters[i].Stop - Beg;
199 (size_t)(ModulePCTable[i].Stop - ModulePCTable[i].Start));
200 for (size_t j = 0; j < Size; j++)
202 Observe(ModulePCTable[i].Start[j]);
204 } else if (NumGuards == NumPCsInPCTables) {
206 for (size_t i = 0; i < NumModules; i++) {
207 uint32_t *Beg = Modules[i].Start;
208 size_t Size = Modules[i].Stop - Beg;
210 (size_t)(ModulePCTable[i].Stop - ModulePCTable[i].Start));
211 for (size_t j = 0; j < Size; j++, GuardIdx++)
212 if (Counters()[GuardIdx])
213 Observe(ModulePCTable[i].Start[j]);
218 for (size_t i = 0, N = Min(CoveredFuncs.size(), NumPrintNewFuncs); i < N;
220 Printf("\tNEW_FUNC[%zd/%zd]: ", i + 1, CoveredFuncs.size());
221 PrintPC("%p %F %L", "%p", GetNextInstructionPc(CoveredFuncs[i]));
227 static std::string GetModuleName(uintptr_t PC) {
228 char ModulePathRaw[4096] = ""; // What's PATH_MAX in portable C++?
229 void *OffsetRaw = nullptr;
230 if (!EF->__sanitizer_get_module_and_offset_for_pc(
231 reinterpret_cast<void *>(PC), ModulePathRaw,
232 sizeof(ModulePathRaw), &OffsetRaw))
234 return ModulePathRaw;
237 template<class CallBack>
238 void TracePC::IterateCoveredFunctions(CallBack CB) {
239 for (size_t i = 0; i < NumPCTables; i++) {
240 auto &M = ModulePCTable[i];
241 assert(M.Start < M.Stop);
242 auto ModuleName = GetModuleName(M.Start->PC);
243 for (auto NextFE = M.Start; NextFE < M.Stop; ) {
245 assert((FE->PCFlags & 1) && "Not a function entry point");
248 } while (NextFE < M.Stop && !(NextFE->PCFlags & 1));
249 if (ObservedFuncs.count(FE->PC))
250 CB(FE, NextFE, ObservedFuncs[FE->PC]);
255 void TracePC::SetFocusFunction(const std::string &FuncName) {
256 // This function should be called once.
257 assert(FocusFunction.first > NumModulesWithInline8bitCounters);
258 if (FuncName.empty())
260 for (size_t M = 0; M < NumModulesWithInline8bitCounters; M++) {
261 auto &PCTE = ModulePCTable[M];
262 size_t N = PCTE.Stop - PCTE.Start;
263 for (size_t I = 0; I < N; I++) {
264 if (!(PCTE.Start[I].PCFlags & 1)) continue; // not a function entry.
265 auto Name = DescribePC("%F", GetNextInstructionPc(PCTE.Start[I].PC));
266 if (Name[0] == 'i' && Name[1] == 'n' && Name[2] == ' ')
267 Name = Name.substr(3, std::string::npos);
268 if (FuncName != Name) continue;
269 Printf("INFO: Focus function is set to '%s'\n", Name.c_str());
270 FocusFunction = {M, I};
276 bool TracePC::ObservedFocusFunction() {
277 size_t I = FocusFunction.first;
278 size_t J = FocusFunction.second;
279 if (I >= NumModulesWithInline8bitCounters)
281 auto &MC = ModuleCounters[I];
282 size_t Size = MC.Stop - MC.Start;
285 return MC.Start[J] != 0;
288 void TracePC::PrintCoverage() {
289 if (!EF->__sanitizer_symbolize_pc ||
290 !EF->__sanitizer_get_module_and_offset_for_pc) {
291 Printf("INFO: __sanitizer_symbolize_pc or "
292 "__sanitizer_get_module_and_offset_for_pc is not available,"
293 " not printing coverage\n");
296 Printf("COVERAGE:\n");
297 auto CoveredFunctionCallback = [&](const PCTableEntry *First,
298 const PCTableEntry *Last,
300 assert(First < Last);
301 auto VisualizePC = GetNextInstructionPc(First->PC);
302 std::string FileStr = DescribePC("%s", VisualizePC);
303 if (!IsInterestingCoverageFile(FileStr))
305 std::string FunctionStr = DescribePC("%F", VisualizePC);
306 if (FunctionStr.find("in ") == 0)
307 FunctionStr = FunctionStr.substr(3);
308 std::string LineStr = DescribePC("%l", VisualizePC);
309 size_t Line = std::stoul(LineStr);
310 size_t NumEdges = Last - First;
311 Vector<uintptr_t> UncoveredPCs;
312 for (auto TE = First; TE < Last; TE++)
313 if (!ObservedPCs.count(TE->PC))
314 UncoveredPCs.push_back(TE->PC);
315 Printf("COVERED_FUNC: hits: %zd", Counter);
316 Printf(" edges: %zd/%zd", NumEdges - UncoveredPCs.size(), NumEdges);
317 Printf(" %s %s:%zd\n", FunctionStr.c_str(), FileStr.c_str(), Line);
318 for (auto PC: UncoveredPCs)
319 Printf(" UNCOVERED_PC: %s\n",
320 DescribePC("%s:%l", GetNextInstructionPc(PC)).c_str());
323 IterateCoveredFunctions(CoveredFunctionCallback);
326 void TracePC::DumpCoverage() {
327 if (EF->__sanitizer_dump_coverage) {
328 Vector<uintptr_t> PCsCopy(GetNumPCs());
329 for (size_t i = 0; i < GetNumPCs(); i++)
330 PCsCopy[i] = PCs()[i] ? GetPreviousInstructionPc(PCs()[i]) : 0;
331 EF->__sanitizer_dump_coverage(PCsCopy.data(), PCsCopy.size());
336 // We keep track of various values that affect control flow.
337 // These values are inserted into a bit-set-based hash map.
338 // Every new bit in the map is treated as a new coverage.
340 // For memcmp/strcmp/etc the interesting value is the length of the common
341 // prefix of the parameters.
342 // For cmp instructions the interesting value is a XOR of the parameters.
343 // The interesting value is mixed up with the PC and is then added to the map.
345 ATTRIBUTE_NO_SANITIZE_ALL
346 void TracePC::AddValueForMemcmp(void *caller_pc, const void *s1, const void *s2,
347 size_t n, bool StopAtZero) {
349 size_t Len = std::min(n, Word::GetMaxSize());
350 const uint8_t *A1 = reinterpret_cast<const uint8_t *>(s1);
351 const uint8_t *A2 = reinterpret_cast<const uint8_t *>(s2);
352 uint8_t B1[Word::kMaxSize];
353 uint8_t B2[Word::kMaxSize];
354 // Copy the data into locals in this non-msan-instrumented function
355 // to avoid msan complaining further.
356 size_t Hash = 0; // Compute some simple hash of both strings.
357 for (size_t i = 0; i < Len; i++) {
361 Hash ^= (T << 8) | B2[i];
365 if (B1[I] != B2[I] || (StopAtZero && B1[I] == 0))
367 size_t PC = reinterpret_cast<size_t>(caller_pc);
368 size_t Idx = (PC & 4095) | (I << 12);
369 ValueProfileMap.AddValue(Idx);
370 TORCW.Insert(Idx ^ Hash, Word(B1, Len), Word(B2, Len));
374 ATTRIBUTE_TARGET_POPCNT ALWAYS_INLINE
375 ATTRIBUTE_NO_SANITIZE_ALL
376 void TracePC::HandleCmp(uintptr_t PC, T Arg1, T Arg2) {
377 uint64_t ArgXor = Arg1 ^ Arg2;
379 TORC4.Insert(ArgXor, Arg1, Arg2);
380 else if (sizeof(T) == 8)
381 TORC8.Insert(ArgXor, Arg1, Arg2);
382 uint64_t HammingDistance = Popcountll(ArgXor); // [0,64]
383 uint64_t AbsoluteDistance = (Arg1 == Arg2 ? 0 : Clzll(Arg1 - Arg2) + 1);
384 ValueProfileMap.AddValue(PC * 128 + HammingDistance);
385 ValueProfileMap.AddValue(PC * 128 + 64 + AbsoluteDistance);
388 static size_t InternalStrnlen(const char *S, size_t MaxLen) {
390 for (; Len < MaxLen && S[Len]; Len++) {}
394 // Finds min of (strlen(S1), strlen(S2)).
395 // Needed bacause one of these strings may actually be non-zero terminated.
396 static size_t InternalStrnlen2(const char *S1, const char *S2) {
398 for (; S1[Len] && S2[Len]; Len++) {}
402 void TracePC::ClearInlineCounters() {
403 for (size_t i = 0; i < NumModulesWithInline8bitCounters; i++) {
404 uint8_t *Beg = ModuleCounters[i].Start;
405 size_t Size = ModuleCounters[i].Stop - Beg;
406 memset(Beg, 0, Size);
410 ATTRIBUTE_NO_SANITIZE_ALL
411 void TracePC::RecordInitialStack() {
413 __sancov_lowest_stack = InitialStack = reinterpret_cast<uintptr_t>(&stack);
416 uintptr_t TracePC::GetMaxStackOffset() const {
417 return InitialStack - __sancov_lowest_stack; // Stack grows down
420 } // namespace fuzzer
424 ATTRIBUTE_NO_SANITIZE_ALL
425 void __sanitizer_cov_trace_pc_guard(uint32_t *Guard) {
426 uintptr_t PC = reinterpret_cast<uintptr_t>(GET_CALLER_PC());
427 uint32_t Idx = *Guard;
428 __sancov_trace_pc_pcs[Idx] = PC;
429 __sancov_trace_pc_guard_8bit_counters[Idx]++;
432 // Best-effort support for -fsanitize-coverage=trace-pc, which is available
433 // in both Clang and GCC.
435 ATTRIBUTE_NO_SANITIZE_ALL
436 void __sanitizer_cov_trace_pc() {
437 uintptr_t PC = reinterpret_cast<uintptr_t>(GET_CALLER_PC());
438 uintptr_t Idx = PC & (((uintptr_t)1 << fuzzer::TracePC::kTracePcBits) - 1);
439 __sancov_trace_pc_pcs[Idx] = PC;
440 __sancov_trace_pc_guard_8bit_counters[Idx]++;
444 void __sanitizer_cov_trace_pc_guard_init(uint32_t *Start, uint32_t *Stop) {
445 fuzzer::TPC.HandleInit(Start, Stop);
449 void __sanitizer_cov_8bit_counters_init(uint8_t *Start, uint8_t *Stop) {
450 fuzzer::TPC.HandleInline8bitCountersInit(Start, Stop);
454 void __sanitizer_cov_pcs_init(const uintptr_t *pcs_beg,
455 const uintptr_t *pcs_end) {
456 fuzzer::TPC.HandlePCsInit(pcs_beg, pcs_end);
460 ATTRIBUTE_NO_SANITIZE_ALL
461 void __sanitizer_cov_trace_pc_indir(uintptr_t Callee) {
462 uintptr_t PC = reinterpret_cast<uintptr_t>(GET_CALLER_PC());
463 fuzzer::TPC.HandleCallerCallee(PC, Callee);
467 ATTRIBUTE_NO_SANITIZE_ALL
468 ATTRIBUTE_TARGET_POPCNT
469 void __sanitizer_cov_trace_cmp8(uint64_t Arg1, uint64_t Arg2) {
470 uintptr_t PC = reinterpret_cast<uintptr_t>(GET_CALLER_PC());
471 fuzzer::TPC.HandleCmp(PC, Arg1, Arg2);
475 ATTRIBUTE_NO_SANITIZE_ALL
476 ATTRIBUTE_TARGET_POPCNT
477 // Now the __sanitizer_cov_trace_const_cmp[1248] callbacks just mimic
478 // the behaviour of __sanitizer_cov_trace_cmp[1248] ones. This, however,
479 // should be changed later to make full use of instrumentation.
480 void __sanitizer_cov_trace_const_cmp8(uint64_t Arg1, uint64_t Arg2) {
481 uintptr_t PC = reinterpret_cast<uintptr_t>(GET_CALLER_PC());
482 fuzzer::TPC.HandleCmp(PC, Arg1, Arg2);
486 ATTRIBUTE_NO_SANITIZE_ALL
487 ATTRIBUTE_TARGET_POPCNT
488 void __sanitizer_cov_trace_cmp4(uint32_t Arg1, uint32_t Arg2) {
489 uintptr_t PC = reinterpret_cast<uintptr_t>(GET_CALLER_PC());
490 fuzzer::TPC.HandleCmp(PC, Arg1, Arg2);
494 ATTRIBUTE_NO_SANITIZE_ALL
495 ATTRIBUTE_TARGET_POPCNT
496 void __sanitizer_cov_trace_const_cmp4(uint32_t Arg1, uint32_t Arg2) {
497 uintptr_t PC = reinterpret_cast<uintptr_t>(GET_CALLER_PC());
498 fuzzer::TPC.HandleCmp(PC, Arg1, Arg2);
502 ATTRIBUTE_NO_SANITIZE_ALL
503 ATTRIBUTE_TARGET_POPCNT
504 void __sanitizer_cov_trace_cmp2(uint16_t Arg1, uint16_t Arg2) {
505 uintptr_t PC = reinterpret_cast<uintptr_t>(GET_CALLER_PC());
506 fuzzer::TPC.HandleCmp(PC, Arg1, Arg2);
510 ATTRIBUTE_NO_SANITIZE_ALL
511 ATTRIBUTE_TARGET_POPCNT
512 void __sanitizer_cov_trace_const_cmp2(uint16_t Arg1, uint16_t Arg2) {
513 uintptr_t PC = reinterpret_cast<uintptr_t>(GET_CALLER_PC());
514 fuzzer::TPC.HandleCmp(PC, Arg1, Arg2);
518 ATTRIBUTE_NO_SANITIZE_ALL
519 ATTRIBUTE_TARGET_POPCNT
520 void __sanitizer_cov_trace_cmp1(uint8_t Arg1, uint8_t Arg2) {
521 uintptr_t PC = reinterpret_cast<uintptr_t>(GET_CALLER_PC());
522 fuzzer::TPC.HandleCmp(PC, Arg1, Arg2);
526 ATTRIBUTE_NO_SANITIZE_ALL
527 ATTRIBUTE_TARGET_POPCNT
528 void __sanitizer_cov_trace_const_cmp1(uint8_t Arg1, uint8_t Arg2) {
529 uintptr_t PC = reinterpret_cast<uintptr_t>(GET_CALLER_PC());
530 fuzzer::TPC.HandleCmp(PC, Arg1, Arg2);
534 ATTRIBUTE_NO_SANITIZE_ALL
535 ATTRIBUTE_TARGET_POPCNT
536 void __sanitizer_cov_trace_switch(uint64_t Val, uint64_t *Cases) {
537 uint64_t N = Cases[0];
538 uint64_t ValSizeInBits = Cases[1];
539 uint64_t *Vals = Cases + 2;
540 // Skip the most common and the most boring case.
541 if (Vals[N - 1] < 256 && Val < 256)
543 uintptr_t PC = reinterpret_cast<uintptr_t>(GET_CALLER_PC());
546 for (i = 0; i < N; i++) {
547 Token = Val ^ Vals[i];
552 if (ValSizeInBits == 16)
553 fuzzer::TPC.HandleCmp(PC + i, static_cast<uint16_t>(Token), (uint16_t)(0));
554 else if (ValSizeInBits == 32)
555 fuzzer::TPC.HandleCmp(PC + i, static_cast<uint32_t>(Token), (uint32_t)(0));
557 fuzzer::TPC.HandleCmp(PC + i, Token, (uint64_t)(0));
561 ATTRIBUTE_NO_SANITIZE_ALL
562 ATTRIBUTE_TARGET_POPCNT
563 void __sanitizer_cov_trace_div4(uint32_t Val) {
564 uintptr_t PC = reinterpret_cast<uintptr_t>(GET_CALLER_PC());
565 fuzzer::TPC.HandleCmp(PC, Val, (uint32_t)0);
569 ATTRIBUTE_NO_SANITIZE_ALL
570 ATTRIBUTE_TARGET_POPCNT
571 void __sanitizer_cov_trace_div8(uint64_t Val) {
572 uintptr_t PC = reinterpret_cast<uintptr_t>(GET_CALLER_PC());
573 fuzzer::TPC.HandleCmp(PC, Val, (uint64_t)0);
577 ATTRIBUTE_NO_SANITIZE_ALL
578 ATTRIBUTE_TARGET_POPCNT
579 void __sanitizer_cov_trace_gep(uintptr_t Idx) {
580 uintptr_t PC = reinterpret_cast<uintptr_t>(GET_CALLER_PC());
581 fuzzer::TPC.HandleCmp(PC, Idx, (uintptr_t)0);
584 ATTRIBUTE_INTERFACE ATTRIBUTE_NO_SANITIZE_MEMORY
585 void __sanitizer_weak_hook_memcmp(void *caller_pc, const void *s1,
586 const void *s2, size_t n, int result) {
587 if (!fuzzer::RunningUserCallback) return;
588 if (result == 0) return; // No reason to mutate.
589 if (n <= 1) return; // Not interesting.
590 fuzzer::TPC.AddValueForMemcmp(caller_pc, s1, s2, n, /*StopAtZero*/false);
593 ATTRIBUTE_INTERFACE ATTRIBUTE_NO_SANITIZE_MEMORY
594 void __sanitizer_weak_hook_strncmp(void *caller_pc, const char *s1,
595 const char *s2, size_t n, int result) {
596 if (!fuzzer::RunningUserCallback) return;
597 if (result == 0) return; // No reason to mutate.
598 size_t Len1 = fuzzer::InternalStrnlen(s1, n);
599 size_t Len2 = fuzzer::InternalStrnlen(s2, n);
600 n = std::min(n, Len1);
601 n = std::min(n, Len2);
602 if (n <= 1) return; // Not interesting.
603 fuzzer::TPC.AddValueForMemcmp(caller_pc, s1, s2, n, /*StopAtZero*/true);
606 ATTRIBUTE_INTERFACE ATTRIBUTE_NO_SANITIZE_MEMORY
607 void __sanitizer_weak_hook_strcmp(void *caller_pc, const char *s1,
608 const char *s2, int result) {
609 if (!fuzzer::RunningUserCallback) return;
610 if (result == 0) return; // No reason to mutate.
611 size_t N = fuzzer::InternalStrnlen2(s1, s2);
612 if (N <= 1) return; // Not interesting.
613 fuzzer::TPC.AddValueForMemcmp(caller_pc, s1, s2, N, /*StopAtZero*/true);
616 ATTRIBUTE_INTERFACE ATTRIBUTE_NO_SANITIZE_MEMORY
617 void __sanitizer_weak_hook_strncasecmp(void *called_pc, const char *s1,
618 const char *s2, size_t n, int result) {
619 if (!fuzzer::RunningUserCallback) return;
620 return __sanitizer_weak_hook_strncmp(called_pc, s1, s2, n, result);
623 ATTRIBUTE_INTERFACE ATTRIBUTE_NO_SANITIZE_MEMORY
624 void __sanitizer_weak_hook_strcasecmp(void *called_pc, const char *s1,
625 const char *s2, int result) {
626 if (!fuzzer::RunningUserCallback) return;
627 return __sanitizer_weak_hook_strcmp(called_pc, s1, s2, result);
630 ATTRIBUTE_INTERFACE ATTRIBUTE_NO_SANITIZE_MEMORY
631 void __sanitizer_weak_hook_strstr(void *called_pc, const char *s1,
632 const char *s2, char *result) {
633 if (!fuzzer::RunningUserCallback) return;
634 fuzzer::TPC.MMT.Add(reinterpret_cast<const uint8_t *>(s2), strlen(s2));
637 ATTRIBUTE_INTERFACE ATTRIBUTE_NO_SANITIZE_MEMORY
638 void __sanitizer_weak_hook_strcasestr(void *called_pc, const char *s1,
639 const char *s2, char *result) {
640 if (!fuzzer::RunningUserCallback) return;
641 fuzzer::TPC.MMT.Add(reinterpret_cast<const uint8_t *>(s2), strlen(s2));
644 ATTRIBUTE_INTERFACE ATTRIBUTE_NO_SANITIZE_MEMORY
645 void __sanitizer_weak_hook_memmem(void *called_pc, const void *s1, size_t len1,
646 const void *s2, size_t len2, void *result) {
647 if (!fuzzer::RunningUserCallback) return;
648 fuzzer::TPC.MMT.Add(reinterpret_cast<const uint8_t *>(s2), len2);