| /* |
| * |
| * honggfuzz - fuzzing routines |
| * ----------------------------------------- |
| * |
| * Author: |
| * Robert Swiecki <swiecki@google.com> |
| * Felix Gröbert <groebert@google.com> |
| * |
| * Copyright 2010-2015 by Google Inc. All Rights Reserved. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may |
| * not use this file except in compliance with the License. You may obtain |
| * a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
| * implied. See the License for the specific language governing |
| * permissions and limitations under the License. |
| * |
| */ |
| |
| #include "common.h" |
| #include "fuzz.h" |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <inttypes.h> |
| #include <pthread.h> |
| #include <signal.h> |
| #include <stddef.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/param.h> |
| #include <sys/resource.h> |
| #include <sys/mman.h> |
| #include <sys/stat.h> |
| #include <sys/time.h> |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include <time.h> |
| #include <unistd.h> |
| |
| #include "arch.h" |
| #include "files.h" |
| #include "log.h" |
| #include "mangle.h" |
| #include "report.h" |
| #include "sancov.h" |
| #include "util.h" |
| |
| extern char **environ; |
| |
| static pthread_t fuzz_mainThread; |
| |
| static void fuzz_getFileName(honggfuzz_t * hfuzz, char *fileName) |
| { |
| struct timeval tv; |
| gettimeofday(&tv, NULL); |
| |
| snprintf(fileName, PATH_MAX, "%s/.honggfuzz.%d.%lu.%llx.%s", hfuzz->workDir, (int)getpid(), |
| (unsigned long int)tv.tv_sec, (unsigned long long int)util_rndGet(0, 1ULL << 62), |
| hfuzz->fileExtn); |
| } |
| |
| static bool fuzz_prepareExecve(honggfuzz_t * hfuzz, const char *fileName) |
| { |
| /* |
| * Set timeout (prof), real timeout (2*prof), and rlimit_cpu (2*prof) |
| */ |
| if (hfuzz->persistent == false && hfuzz->tmOut) { |
| struct itimerval it; |
| |
| /* |
| * The hfuzz->tmOut is real CPU usage time... |
| */ |
| it.it_value.tv_sec = hfuzz->tmOut; |
| it.it_value.tv_usec = 0; |
| it.it_interval.tv_sec = 0; |
| it.it_interval.tv_usec = 0; |
| if (setitimer(ITIMER_PROF, &it, NULL) == -1) { |
| PLOG_D("Couldn't set the ITIMER_PROF timer"); |
| } |
| |
| /* |
| * ...so, if a process sleeps, this one should |
| * trigger a signal... |
| */ |
| it.it_value.tv_sec = hfuzz->tmOut; |
| it.it_value.tv_usec = 0; |
| it.it_interval.tv_sec = 0; |
| it.it_interval.tv_usec = 0; |
| if (setitimer(ITIMER_REAL, &it, NULL) == -1) { |
| PLOG_E("Couldn't set the ITIMER_REAL timer"); |
| return false; |
| } |
| |
| /* |
| * ..if a process sleeps and catches SIGPROF/SIGALRM |
| * rlimits won't help either. However, arch_checkTimeLimit |
| * will send a SIGKILL at tmOut + 2 seconds. That should |
| * do it :) |
| */ |
| struct rlimit rl; |
| |
| rl.rlim_cur = hfuzz->tmOut + 1; |
| rl.rlim_max = hfuzz->tmOut + 1; |
| if (setrlimit(RLIMIT_CPU, &rl) == -1) { |
| PLOG_D("Couldn't enforce the RLIMIT_CPU resource limit"); |
| } |
| } |
| |
| /* |
| * The address space limit. If big enough - roughly the size of RAM used |
| */ |
| if (hfuzz->asLimit) { |
| struct rlimit rl = { |
| .rlim_cur = hfuzz->asLimit * 1024ULL * 1024ULL, |
| .rlim_max = hfuzz->asLimit * 1024ULL * 1024ULL, |
| }; |
| if (setrlimit(RLIMIT_AS, &rl) == -1) { |
| PLOG_D("Couldn't enforce the RLIMIT_AS resource limit, ignoring"); |
| } |
| } |
| |
| if (hfuzz->nullifyStdio) { |
| util_nullifyStdio(); |
| } |
| |
| if (hfuzz->fuzzStdin) { |
| /* |
| * Uglyyyyyy ;) |
| */ |
| if (!util_redirectStdin(fileName)) { |
| return false; |
| } |
| } |
| |
| if (hfuzz->clearEnv) { |
| environ = NULL; |
| } |
| if (sancov_prepareExecve(hfuzz) == false) { |
| LOG_E("sancov_prepareExecve() failed"); |
| return false; |
| } |
| for (size_t i = 0; i < ARRAYSIZE(hfuzz->envs) && hfuzz->envs[i]; i++) { |
| putenv(hfuzz->envs[i]); |
| } |
| setsid(); |
| |
| return true; |
| } |
| |
| static bool fuzz_prepareFileDynamically(honggfuzz_t * hfuzz, fuzzer_t * fuzzer) |
| { |
| struct dynfile_t *dynfile; |
| |
| { |
| MX_SCOPED_LOCK(&hfuzz->dynfileq_mutex); |
| |
| if (hfuzz->dynfileqCnt == 0) { |
| LOG_F("The dynamic file corpus is empty. Apparently, the initial fuzzing of the " |
| "provided file corpus (-f) has not produced any follow-up files with positive " |
| "coverage and/or CPU counters"); |
| } |
| |
| size_t i = 0U; |
| size_t dynFilePos = util_rndGet(0, hfuzz->dynfileqCnt - 1); |
| TAILQ_FOREACH(dynfile, &hfuzz->dynfileq, pointers) { |
| if (i++ == dynFilePos) { |
| break; |
| } |
| } |
| } |
| |
| memcpy(fuzzer->dynamicFile, dynfile->data, dynfile->size); |
| fuzzer->dynamicFileSz = dynfile->size; |
| |
| mangle_Resize(hfuzz, fuzzer->dynamicFile, &fuzzer->dynamicFileSz); |
| mangle_mangleContent(hfuzz, fuzzer); |
| |
| if (hfuzz->persistent == false && files_writeBufToFile |
| (fuzzer->fileName, fuzzer->dynamicFile, fuzzer->dynamicFileSz, |
| O_WRONLY | O_CREAT | O_EXCL | O_TRUNC | O_CLOEXEC) == false) { |
| LOG_E("Couldn't write buffer to file '%s'", fuzzer->fileName); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| static bool fuzz_prepareFile(honggfuzz_t * hfuzz, fuzzer_t * fuzzer, int rnd_index) |
| { |
| ssize_t fileSz = |
| files_readFileToBufMax(hfuzz->files[rnd_index], fuzzer->dynamicFile, hfuzz->maxFileSz); |
| if (fileSz < 0) { |
| LOG_E("Couldn't read contents of '%s'", hfuzz->files[rnd_index]); |
| return false; |
| } |
| fuzzer->dynamicFileSz = fileSz; |
| |
| /* If flip rate is 0.0, early abort file mangling */ |
| if (fuzzer->flipRate != 0.0L) { |
| mangle_Resize(hfuzz, fuzzer->dynamicFile, &fuzzer->dynamicFileSz); |
| mangle_mangleContent(hfuzz, fuzzer); |
| } |
| |
| if (hfuzz->persistent == false && files_writeBufToFile |
| (fuzzer->fileName, fuzzer->dynamicFile, fuzzer->dynamicFileSz, |
| O_WRONLY | O_CREAT | O_EXCL | O_CLOEXEC) == false) { |
| LOG_E("Couldn't write buffer to file '%s'", fuzzer->fileName); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| static bool fuzz_prepareFileExternally(honggfuzz_t * hfuzz, fuzzer_t * fuzzer) |
| { |
| int dstfd = open(fuzzer->fileName, O_CREAT | O_EXCL | O_RDWR | O_CLOEXEC, 0644); |
| if (dstfd == -1) { |
| PLOG_E("Couldn't create a temporary file '%s'", fuzzer->fileName); |
| return false; |
| } |
| close(dstfd); |
| |
| LOG_D("Created '%s' as an input file", fuzzer->fileName); |
| |
| pid_t pid = fork(); |
| if (pid == -1) { |
| PLOG_E("Couldn't fork"); |
| return false; |
| } |
| |
| if (!pid) { |
| /* |
| * child performs the external file modifications |
| */ |
| execl(hfuzz->externalCommand, hfuzz->externalCommand, fuzzer->fileName, NULL); |
| PLOG_F("Couldn't execute '%s %s'", hfuzz->externalCommand, fuzzer->fileName); |
| return false; |
| } |
| |
| /* |
| * parent waits until child is done fuzzing the input file |
| */ |
| int childStatus; |
| int flags = 0; |
| #if defined(__WNOTHREAD) |
| flags |= __WNOTHREAD; |
| #endif /* defined(__WNOTHREAD) */ |
| while (wait4(pid, &childStatus, flags, NULL) != pid) ; |
| if (WIFSIGNALED(childStatus)) { |
| LOG_E("External command terminated with signal %d", WTERMSIG(childStatus)); |
| return false; |
| } |
| if (!WIFEXITED(childStatus)) { |
| LOG_F("External command terminated abnormally, status: %d", childStatus); |
| return false; |
| } |
| LOG_D("External command exited with status %d", WEXITSTATUS(childStatus)); |
| |
| ssize_t rsz = files_readFileToBufMax(fuzzer->fileName, fuzzer->dynamicFile, hfuzz->maxFileSz); |
| if (rsz < 0) { |
| LOG_W("Couldn't read back '%s' to the buffer", fuzzer->fileName); |
| return false; |
| } |
| fuzzer->dynamicFileSz = rsz; |
| |
| if (hfuzz->persistent) { |
| unlink(fuzzer->fileName); |
| } |
| |
| return true; |
| } |
| |
| static bool fuzz_runVerifier(honggfuzz_t * hfuzz, fuzzer_t * crashedFuzzer) |
| { |
| int crashFd = -1; |
| uint8_t *crashBuf = NULL; |
| off_t crashFileSz = 0; |
| |
| crashBuf = files_mapFile(crashedFuzzer->crashFileName, &crashFileSz, &crashFd, false); |
| if (crashBuf == NULL) { |
| LOG_E("Couldn't open and map '%s' in R/O mode", crashedFuzzer->crashFileName); |
| return false; |
| } |
| defer { |
| munmap(crashBuf, crashFileSz); |
| close(crashFd); |
| }; |
| |
| LOG_I("Launching verifier for %" PRIx64 " hash", crashedFuzzer->backtrace); |
| for (int i = 0; i < _HF_VERIFIER_ITER; i++) { |
| fuzzer_t vFuzzer = { |
| .pid = 0, |
| .persistentPid = 0, |
| .timeStartedMillis = util_timeNowMillis(), |
| .crashFileName = {0}, |
| .pc = 0ULL, |
| .backtrace = 0ULL, |
| .access = 0ULL, |
| .exception = 0, |
| .dynamicFileSz = 0, |
| .dynamicFile = NULL, |
| .sanCovCnts = { |
| .hitBBCnt = 0ULL, |
| .totalBBCnt = 0ULL, |
| .dsoCnt = 0ULL, |
| .iDsoCnt = 0ULL, |
| .newBBCnt = 0ULL, |
| .crashesCnt = 0ULL, |
| }, |
| .report = {'\0'}, |
| .mainWorker = false, |
| |
| .linux = { |
| .hwCnts = { |
| .cpuInstrCnt = 0ULL, |
| .cpuBranchCnt = 0ULL, |
| .customCnt = 0ULL, |
| .bbCnt = 0ULL, |
| .newBBCnt = 0ULL, |
| }, |
| .perfMmapBuf = NULL, |
| .perfMmapAux = NULL, |
| #if defined(_HF_ARCH_LINUX) |
| .timerId = (timer_t) 0, |
| #endif // defined(_HF_ARCH_LINUX) |
| .attachedPid = 0, |
| .persistentSock = -1, |
| }, |
| }; |
| |
| if (arch_archThreadInit(hfuzz, &vFuzzer) == false) { |
| LOG_F("Could not initialize the thread"); |
| } |
| |
| fuzz_getFileName(hfuzz, vFuzzer.fileName); |
| if (files_writeBufToFile |
| (vFuzzer.fileName, crashBuf, crashFileSz, |
| O_WRONLY | O_CREAT | O_EXCL | O_CLOEXEC) == false) { |
| LOG_E("Couldn't write buffer to file '%s'", vFuzzer.fileName); |
| return false; |
| } |
| |
| vFuzzer.pid = arch_fork(hfuzz, &vFuzzer); |
| if (vFuzzer.pid == -1) { |
| PLOG_F("Couldn't fork"); |
| return false; |
| } |
| |
| if (!vFuzzer.pid) { |
| if (fuzz_prepareExecve(hfuzz, crashedFuzzer->crashFileName) == false) { |
| LOG_E("fuzz_prepareExecve() failed"); |
| return false; |
| } |
| if (!arch_launchChild(hfuzz, crashedFuzzer->crashFileName)) { |
| LOG_E("Error launching verifier child process"); |
| return false; |
| } |
| } |
| |
| arch_reapChild(hfuzz, &vFuzzer); |
| unlink(vFuzzer.fileName); |
| |
| /* If stack hash doesn't match skip name tag and exit */ |
| if (crashedFuzzer->backtrace != vFuzzer.backtrace) { |
| LOG_D("Verifier stack hash mismatch"); |
| return false; |
| } |
| } |
| |
| /* Workspace is inherited, just append a extra suffix */ |
| char verFile[PATH_MAX] = { 0 }; |
| snprintf(verFile, sizeof(verFile), "%s.verified", crashedFuzzer->crashFileName); |
| |
| /* Copy file with new suffix & remove original copy */ |
| bool dstFileExists = false; |
| if (files_copyFile(crashedFuzzer->crashFileName, verFile, &dstFileExists)) { |
| LOG_I("Successfully verified, saving as (%s)", verFile); |
| ATOMIC_POST_INC(hfuzz->verifiedCrashesCnt); |
| unlink(crashedFuzzer->crashFileName); |
| } else { |
| if (dstFileExists) { |
| LOG_I("It seems that '%s' already exists, skipping", verFile); |
| } else { |
| LOG_E("Couldn't copy '%s' to '%s'", crashedFuzzer->crashFileName, verFile); |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| static void fuzz_addFileToFileQLocked(honggfuzz_t * hfuzz, uint8_t * data, size_t size, |
| uint64_t cov) |
| { |
| struct dynfile_t *dynfile = (struct dynfile_t *)util_Malloc(sizeof(struct dynfile_t)); |
| dynfile->size = size; |
| dynfile->data = (uint8_t *) util_Malloc(size); |
| memcpy(dynfile->data, data, size); |
| TAILQ_INSERT_TAIL(&hfuzz->dynfileq, dynfile, pointers); |
| hfuzz->dynfileqCnt++; |
| |
| char fname[PATH_MAX]; |
| snprintf(fname, sizeof(fname), |
| "%s/COV.RANK.%06" PRIu64 ".PID.%d.COVBB.%07" PRIu64 ".TIME.%" PRIu64 ".RND.%" PRIx64, |
| hfuzz->workDir, (uint64_t) 999999ULL - cov, getpid(), cov, (uint64_t) time(NULL), |
| util_rndGet(0, 0xFFFFFFFFFFFF)); |
| if (files_writeBufToFile(fname, data, size, O_WRONLY | O_CREAT | O_EXCL | O_TRUNC | O_CLOEXEC) |
| == false) { |
| LOG_W("Couldn't write buffer to file '%s'", fname); |
| } |
| } |
| |
| static void fuzz_perfFeedback(honggfuzz_t * hfuzz, fuzzer_t * fuzzer) |
| { |
| LOG_D |
| ("New file size: %zu, Perf feedback new/cur (instr,branch): %" PRIu64 "/%" PRIu64 ",%" |
| PRIu64 "/%" PRIu64 ", BBcnt new/total: %" PRIu64 "/%" PRIu64, fuzzer->dynamicFileSz, |
| fuzzer->linux.hwCnts.cpuInstrCnt, hfuzz->linux.hwCnts.cpuInstrCnt, |
| fuzzer->linux.hwCnts.cpuBranchCnt, hfuzz->linux.hwCnts.cpuBranchCnt, |
| fuzzer->linux.hwCnts.newBBCnt, hfuzz->linux.hwCnts.bbCnt); |
| |
| MX_SCOPED_LOCK(&hfuzz->dynfileq_mutex); |
| |
| int64_t diff0 = hfuzz->linux.hwCnts.cpuInstrCnt - fuzzer->linux.hwCnts.cpuInstrCnt; |
| int64_t diff1 = hfuzz->linux.hwCnts.cpuBranchCnt - fuzzer->linux.hwCnts.cpuBranchCnt; |
| int64_t diff2 = hfuzz->linux.hwCnts.customCnt - fuzzer->linux.hwCnts.customCnt; |
| |
| if (diff0 < 0 || diff1 < 0 || diff2 < 0 || fuzzer->linux.hwCnts.newBBCnt > 0) { |
| LOG_I |
| ("New file size: %zu, Perf feedback new/cur (instr,branch): %" PRIu64 "/%" PRIu64 ",%" |
| PRIu64 "/%" PRIu64 ", BBcnt new/total: %" PRIu64 "/%" PRIu64, fuzzer->dynamicFileSz, |
| fuzzer->linux.hwCnts.cpuInstrCnt, hfuzz->linux.hwCnts.cpuInstrCnt, |
| fuzzer->linux.hwCnts.cpuBranchCnt, hfuzz->linux.hwCnts.cpuBranchCnt, |
| fuzzer->linux.hwCnts.newBBCnt, hfuzz->linux.hwCnts.bbCnt); |
| |
| hfuzz->linux.hwCnts.cpuInstrCnt = fuzzer->linux.hwCnts.cpuInstrCnt; |
| hfuzz->linux.hwCnts.cpuBranchCnt = fuzzer->linux.hwCnts.cpuBranchCnt; |
| hfuzz->linux.hwCnts.customCnt = fuzzer->linux.hwCnts.customCnt; |
| hfuzz->linux.hwCnts.bbCnt += fuzzer->linux.hwCnts.newBBCnt; |
| |
| fuzz_addFileToFileQLocked(hfuzz, fuzzer->dynamicFile, fuzzer->dynamicFileSz, |
| fuzzer->linux.hwCnts.newBBCnt); |
| } |
| } |
| |
| static void fuzz_sanCovFeedback(honggfuzz_t * hfuzz, fuzzer_t * fuzzer) |
| { |
| LOG_D |
| ("File size (Best/New): %zu, SanCov feedback (bb,dso): Best: [%" PRIu64 |
| ",%" PRIu64 "] / New: [%" PRIu64 ",%" PRIu64 "], newBBs:%" PRIu64, |
| fuzzer->dynamicFileSz, hfuzz->sanCovCnts.hitBBCnt, |
| hfuzz->sanCovCnts.iDsoCnt, fuzzer->sanCovCnts.hitBBCnt, fuzzer->sanCovCnts.iDsoCnt, |
| fuzzer->sanCovCnts.newBBCnt); |
| |
| MX_SCOPED_LOCK(&hfuzz->dynfileq_mutex); |
| |
| /* |
| * Keep mutated seed if: |
| * a) Newly discovered (not met before) BBs |
| * b) More instrumented DSOs loaded |
| * |
| * TODO: (a) method can significantly assist to further improvements in interesting areas |
| * discovery if combined with seeds pool/queue support. If a runtime queue is maintained |
| * more interesting seeds can be saved between runs instead of instantly discarded |
| * based on current absolute elitism (only one mutated seed is promoted). |
| */ |
| if (fuzzer->sanCovCnts.newBBCnt > 0 || hfuzz->sanCovCnts.iDsoCnt < fuzzer->sanCovCnts.iDsoCnt) { |
| LOG_I("SanCov Update: file size (Cur): %zu, newBBs:%" PRIu64 |
| ", counters (Cur,New): %" PRIu64 "/%" PRIu64 ",%" PRIu64 "/%" PRIu64, |
| fuzzer->dynamicFileSz, fuzzer->sanCovCnts.newBBCnt, |
| hfuzz->sanCovCnts.hitBBCnt, hfuzz->sanCovCnts.iDsoCnt, fuzzer->sanCovCnts.hitBBCnt, |
| fuzzer->sanCovCnts.iDsoCnt); |
| |
| hfuzz->sanCovCnts.hitBBCnt += fuzzer->sanCovCnts.newBBCnt; |
| hfuzz->sanCovCnts.dsoCnt = fuzzer->sanCovCnts.dsoCnt; |
| hfuzz->sanCovCnts.iDsoCnt = fuzzer->sanCovCnts.iDsoCnt; |
| hfuzz->sanCovCnts.crashesCnt += fuzzer->sanCovCnts.crashesCnt; |
| hfuzz->sanCovCnts.newBBCnt = fuzzer->sanCovCnts.newBBCnt; |
| |
| if (hfuzz->sanCovCnts.totalBBCnt < fuzzer->sanCovCnts.totalBBCnt) { |
| /* Keep only the max value (for dlopen cases) to measure total target coverage */ |
| hfuzz->sanCovCnts.totalBBCnt = fuzzer->sanCovCnts.totalBBCnt; |
| } |
| |
| fuzz_addFileToFileQLocked(hfuzz, fuzzer->dynamicFile, fuzzer->dynamicFileSz, |
| fuzzer->sanCovCnts.hitBBCnt); |
| } |
| } |
| |
| static fuzzState_t fuzz_getState(honggfuzz_t * hfuzz) |
| { |
| return ATOMIC_GET(hfuzz->state); |
| } |
| |
| static void fuzz_setState(honggfuzz_t * hfuzz, fuzzState_t state) |
| { |
| ATOMIC_SET(hfuzz->state, state); |
| } |
| |
| static void fuzz_fuzzLoop(honggfuzz_t * hfuzz, fuzzer_t * fuzzer) |
| { |
| fuzzer->pid = 0; |
| fuzzer->timeStartedMillis = util_timeNowMillis(); |
| fuzzer->crashFileName[0] = '\0'; |
| fuzzer->pc = 0ULL; |
| fuzzer->backtrace = 0ULL; |
| fuzzer->access = 0ULL; |
| fuzzer->exception = 0; |
| fuzzer->report[0] = '\0'; |
| fuzzer->mainWorker = true; |
| fuzzer->origFileName = "DYNAMIC"; |
| fuzzer->flipRate = hfuzz->origFlipRate; |
| fuzzer->dynamicFileSz = 0; |
| |
| fuzzer->sanCovCnts.hitBBCnt = 0ULL; |
| fuzzer->sanCovCnts.totalBBCnt = 0ULL; |
| fuzzer->sanCovCnts.dsoCnt = 0ULL; |
| fuzzer->sanCovCnts.newBBCnt = 0ULL; |
| fuzzer->sanCovCnts.crashesCnt = 0ULL; |
| |
| fuzzer->linux.hwCnts.cpuInstrCnt = 0ULL; |
| fuzzer->linux.hwCnts.cpuBranchCnt = 0ULL; |
| fuzzer->linux.hwCnts.customCnt = 0ULL; |
| fuzzer->linux.hwCnts.bbCnt = 0ULL; |
| fuzzer->linux.hwCnts.newBBCnt = 0ULL; |
| fuzzer->linux.perfMmapBuf = NULL; |
| fuzzer->linux.perfMmapAux = NULL; |
| |
| size_t rnd_index = util_rndGet(0, hfuzz->fileCnt - 1); |
| |
| /* If dry run mode, pick the next file and not a random one */ |
| if (fuzzer->flipRate == 0.0L && hfuzz->useVerifier) { |
| rnd_index = ATOMIC_POST_INC(hfuzz->lastFileIndex); |
| } |
| |
| if (fuzz_getState(hfuzz) == _HF_STATE_DYNAMIC_PRE) { |
| rnd_index = ATOMIC_POST_INC(hfuzz->lastFileIndex); |
| if (rnd_index >= hfuzz->fileCnt) { |
| /* |
| * The waiting logic (for the DYNAMIC_PRE phase to finish) should be based on cond-waits |
| * or mutexes, but it'd complicate code too much |
| */ |
| while (fuzz_getState(hfuzz) == _HF_STATE_DYNAMIC_PRE) { |
| sleep(1); |
| } |
| } |
| } |
| |
| fuzzState_t state = fuzz_getState(hfuzz); |
| if (state != _HF_STATE_DYNAMIC_MAIN) { |
| fuzzer->origFileName = files_basename(hfuzz->files[rnd_index]); |
| } |
| |
| fuzz_getFileName(hfuzz, fuzzer->fileName); |
| |
| if (hfuzz->externalCommand) { |
| if (!fuzz_prepareFileExternally(hfuzz, fuzzer)) { |
| LOG_F("fuzz_prepareFileExternally() failed"); |
| } |
| } else if (state == _HF_STATE_DYNAMIC_MAIN) { |
| if (!fuzz_prepareFileDynamically(hfuzz, fuzzer)) { |
| LOG_F("fuzz_prepareFileDynamically() failed"); |
| } |
| } else if (state == _HF_STATE_DYNAMIC_PRE) { |
| fuzzer->flipRate = 0.0f; |
| if (!fuzz_prepareFile(hfuzz, fuzzer, rnd_index)) { |
| LOG_F("fuzz_prepareFile() failed"); |
| } |
| } else { |
| if (!fuzz_prepareFile(hfuzz, fuzzer, rnd_index)) { |
| LOG_F("fuzz_prepareFile() failed"); |
| } |
| } |
| |
| fuzzer->pid = fuzzer->persistentPid; |
| if (fuzzer->pid == 0) { |
| fuzzer->pid = arch_fork(hfuzz, fuzzer); |
| if (fuzzer->pid == -1) { |
| PLOG_F("Couldn't fork"); |
| } |
| |
| if (!fuzzer->pid) { |
| if (!fuzz_prepareExecve(hfuzz, fuzzer->fileName)) { |
| LOG_E("fuzz_prepareExecve() failed"); |
| exit(EXIT_FAILURE); |
| } |
| if (!arch_launchChild(hfuzz, fuzzer->fileName)) { |
| LOG_E("Error launching child process"); |
| exit(EXIT_FAILURE); |
| } |
| } |
| |
| if (hfuzz->persistent) { |
| LOG_I("Persistent mode: Launched new persistent PID: %d", (int)fuzzer->pid); |
| fuzzer->persistentPid = fuzzer->pid; |
| } |
| } |
| |
| LOG_D("Launched new process, pid: %d, (concurrency: %zd)", fuzzer->pid, hfuzz->threadsMax); |
| |
| arch_reapChild(hfuzz, fuzzer); |
| if (hfuzz->persistent == false) { |
| unlink(fuzzer->fileName); |
| } |
| |
| if (hfuzz->dynFileMethod != _HF_DYNFILE_NONE) { |
| fuzz_perfFeedback(hfuzz, fuzzer); |
| } |
| if (hfuzz->useSanCov) { |
| fuzz_sanCovFeedback(hfuzz, fuzzer); |
| } |
| |
| if (hfuzz->useVerifier && (fuzzer->crashFileName[0] != 0) && fuzzer->backtrace) { |
| if (!fuzz_runVerifier(hfuzz, fuzzer)) { |
| LOG_I("Failed to verify %s", fuzzer->crashFileName); |
| } |
| } |
| |
| report_Report(hfuzz, fuzzer->report); |
| |
| if (state == _HF_STATE_DYNAMIC_PRE && ATOMIC_PRE_INC(hfuzz->doneFileIndex) >= hfuzz->fileCnt) { |
| fuzz_setState(hfuzz, _HF_STATE_DYNAMIC_MAIN); |
| } |
| } |
| |
| static void *fuzz_threadNew(void *arg) |
| { |
| LOG_I("Launched new fuzzing thread"); |
| |
| honggfuzz_t *hfuzz = (honggfuzz_t *) arg; |
| |
| fuzzer_t fuzzer = { |
| .pid = 0, |
| .persistentPid = 0, |
| .dynamicFile = util_Malloc(hfuzz->maxFileSz), |
| |
| #if defined(_HF_ARCH_LINUX) |
| .linux.timerId = (timer_t) 0, |
| #endif // defined(_HF_ARCH_LINUX) |
| .linux.attachedPid = 0,.linux.persistentSock = -1, |
| }; |
| defer { |
| free(fuzzer.dynamicFile); |
| }; |
| |
| if (arch_archThreadInit(hfuzz, &fuzzer) == false) { |
| LOG_F("Could not initialize the thread"); |
| } |
| |
| for (;;) { |
| /* Check if dry run mode with verifier enabled */ |
| if (hfuzz->origFlipRate == 0.0L && hfuzz->useVerifier) { |
| if (ATOMIC_POST_INC(hfuzz->mutationsCnt) >= hfuzz->fileCnt) { |
| ATOMIC_POST_INC(hfuzz->threadsFinished); |
| // All files checked, weak-up the main process |
| pthread_kill(fuzz_mainThread, SIGALRM); |
| return NULL; |
| } |
| } |
| /* Check for max iterations limit if set */ |
| else if ((ATOMIC_POST_INC(hfuzz->mutationsCnt) >= hfuzz->mutationsMax) |
| && hfuzz->mutationsMax) { |
| ATOMIC_POST_INC(hfuzz->threadsFinished); |
| // Wake-up the main process |
| pthread_kill(fuzz_mainThread, SIGALRM); |
| return NULL; |
| } |
| |
| fuzz_fuzzLoop(hfuzz, &fuzzer); |
| } |
| } |
| |
| static void fuzz_runThread(honggfuzz_t * hfuzz, void *(*thread) (void *)) |
| { |
| pthread_attr_t attr; |
| |
| pthread_attr_init(&attr); |
| pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); |
| pthread_attr_setstacksize(&attr, _HF_PTHREAD_STACKSIZE); |
| pthread_attr_setguardsize(&attr, (size_t) sysconf(_SC_PAGESIZE)); |
| |
| pthread_t t; |
| if (pthread_create(&t, &attr, thread, (void *)hfuzz) < 0) { |
| PLOG_F("Couldn't create a new thread"); |
| } |
| |
| return; |
| } |
| |
| void fuzz_threads(honggfuzz_t * hfuzz) |
| { |
| fuzz_mainThread = pthread_self(); |
| |
| if (!arch_archInit(hfuzz)) { |
| LOG_F("Couldn't prepare arch for fuzzing"); |
| } |
| if (!sancov_Init(hfuzz)) { |
| LOG_F("Couldn't prepare sancov options"); |
| } |
| |
| if (hfuzz->useSanCov || hfuzz->dynFileMethod != _HF_DYNFILE_NONE) { |
| fuzz_setState(hfuzz, _HF_STATE_DYNAMIC_PRE); |
| } else { |
| fuzz_setState(hfuzz, _HF_STATE_STATIC); |
| } |
| |
| for (size_t i = 0; i < hfuzz->threadsMax; i++) { |
| fuzz_runThread(hfuzz, fuzz_threadNew); |
| } |
| } |