/* american fuzzy lop++ - fuzzer code -------------------------------- Originally written by Michal Zalewski Now maintained by Marc Heuse , Heiko Eißfeldt and Andrea Fioraldi Copyright 2016, 2017 Google Inc. All rights reserved. Copyright 2019-2024 AFLplusplus Project. 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: https://www.apache.org/licenses/LICENSE-2.0 This is the real deal: the program takes an instrumented binary and attempts a variety of basic fuzzing tricks, paying close attention to how they affect the execution path. */ #include "afl-fuzz.h" #include "cmplog.h" #include "common.h" #include #include #ifndef USEMMAP #include #include #include #include #include #endif #ifdef __APPLE__ #include #include #endif #ifdef PROFILING extern u64 time_spent_working; #endif static void at_exit() { s32 i, pid1 = 0, pid2 = 0, pgrp = -1; char *list[4] = {SHM_ENV_VAR, SHM_FUZZ_ENV_VAR, CMPLOG_SHM_ENV_VAR, NULL}; char *ptr; ptr = getenv("__AFL_TARGET_PID2"); if (ptr && *ptr && (pid2 = atoi(ptr)) > 0) { pgrp = getpgid(pid2); if (pgrp > 0) { killpg(pgrp, SIGTERM); } kill(pid2, SIGTERM); } ptr = getenv("__AFL_TARGET_PID1"); if (ptr && *ptr && (pid1 = atoi(ptr)) > 0) { pgrp = getpgid(pid1); if (pgrp > 0) { killpg(pgrp, SIGTERM); } kill(pid1, SIGTERM); } ptr = getenv(CPU_AFFINITY_ENV_VAR); if (ptr && *ptr) unlink(ptr); i = 0; while (list[i] != NULL) { ptr = getenv(list[i]); if (ptr && *ptr) { #ifdef USEMMAP shm_unlink(ptr); #else shmctl(atoi(ptr), IPC_RMID, NULL); #endif } i++; } int kill_signal = SIGKILL; /* AFL_KILL_SIGNAL should already be a valid int at this point */ if ((ptr = getenv("AFL_KILL_SIGNAL"))) { kill_signal = atoi(ptr); } if (pid1 > 0) { pgrp = getpgid(pid1); if (pgrp > 0) { killpg(pgrp, kill_signal); } kill(pid1, kill_signal); } if (pid2 > 0) { pgrp = getpgid(pid1); if (pgrp > 0) { killpg(pgrp, kill_signal); } kill(pid2, kill_signal); } } /* Display usage hints. */ static void usage(u8 *argv0, int more_help) { SAYF( "\n%s [ options ] -- /path/to/fuzzed_app [ ... ]\n\n" "Required parameters:\n" " -i dir - input directory with test cases (or '-' to resume, " "also see \n" " AFL_AUTORESUME)\n" " -o dir - output directory for fuzzer findings\n\n" "Execution control settings:\n" " -P strategy - set fix mutation strategy: explore (focus on new " "coverage),\n" " exploit (focus on triggering crashes). You can also " "set a\n" " number of seconds after without any finds it switches " "to\n" " exploit mode, and back on new coverage (default: %u)\n" " -p schedule - power schedules compute a seed's performance score:\n" " explore(default), fast, exploit, seek, rare, mmopt, " "coe, lin\n" " quad -- see docs/FAQ.md for more information\n" " -f file - location read by the fuzzed program (default: stdin " "or @@)\n" " -t msec - timeout for each run (auto-scaled, default %u ms). " "Add a '+'\n" " to auto-calculate the timeout, the value being the " "maximum.\n" " -m megs - memory limit for child process (%u MB, 0 = no limit " "[default])\n" #if defined(__linux__) && defined(__aarch64__) " -A - use binary-only instrumentation (ARM CoreSight mode)\n" #endif " -O - use binary-only instrumentation (FRIDA mode)\n" #if defined(__linux__) " -Q - use binary-only instrumentation (QEMU mode)\n" " -U - use unicorn-based instrumentation (Unicorn mode)\n" " -W - use qemu-based instrumentation with Wine (Wine mode)\n" #endif #if defined(__linux__) " -X - use VM fuzzing (NYX mode - standalone mode)\n" " -Y - use VM fuzzing (NYX mode - multiple instances mode)\n" #endif "\n" "Mutator settings:\n" " -a type - target input format, \"text\" or \"binary\" (default: " "generic)\n" " -g minlength - set min length of generated fuzz input (default: 1)\n" " -G maxlength - set max length of generated fuzz input (default: " "%lu)\n" " -D - enable (a new) effective deterministic fuzzing\n" " -L minutes - use MOpt(imize) mode and set the time limit for " "entering the\n" " pacemaker mode (minutes of no new finds). 0 = " "immediately,\n" " -1 = immediately and together with normal mutation.\n" " Note: this option is usually not very effective\n" " -c program - enable CmpLog by specifying a binary compiled for " "it.\n" " if using QEMU/FRIDA or the fuzzing target is " "compiled\n" " for CmpLog then use '-c 0'. To disable Cmplog use '-c " "-'.\n" " -l cmplog_opts - CmpLog configuration values (e.g. \"2ATR\"):\n" " 1=small files, 2=larger files (default), 3=all " "files,\n" " A=arithmetic solving, T=transformational solving,\n" " X=extreme transform solving, R=random colorization " "bytes.\n\n" "Fuzzing behavior settings:\n" " -Z - sequential queue selection instead of weighted " "random\n" " -N - do not unlink the fuzzing input file (for devices " "etc.)\n" " -n - fuzz without instrumentation (non-instrumented mode)\n" " -x dict_file - fuzzer dictionary (see README.md, specify up to 4 " "times)\n\n" "Test settings:\n" " -s seed - use a fixed seed for the RNG\n" " -V seconds - fuzz for a specified time then terminate\n" " -E execs - fuzz for an approx. no. of total executions then " "terminate\n" " Note: not precise and can have several more " "executions.\n\n" "Other stuff:\n" " -M/-S id - distributed mode (-M sets -Z and disables trimming)\n" " see docs/fuzzing_in_depth.md#c-using-multiple-cores\n" " for effective recommendations for parallel fuzzing.\n" " -F path - sync to a foreign fuzzer queue directory (requires " "-M, can\n" " be specified up to %u times)\n" // " -d - skip deterministic fuzzing in -M mode\n" " -T text - text banner to show on the screen\n" " -I command - execute this command/script when a new crash is " "found\n" //" -B bitmap.txt - mutate a specific test case, use the // out/default/fuzz_bitmap file\n" " -C - crash exploration mode (the peruvian rabbit thing)\n" " -b cpu_id - bind the fuzzing process to the specified CPU core " "(0-...)\n" " -e ext - file extension for the fuzz test input file (if " "needed)\n" "\n", argv0, STRATEGY_SWITCH_TIME, EXEC_TIMEOUT, MEM_LIMIT, MAX_FILE, FOREIGN_SYNCS_MAX); if (more_help > 1) { #if defined USE_COLOR && !defined ALWAYS_COLORED #define DYN_COLOR \ "AFL_NO_COLOR or AFL_NO_COLOUR: switch colored console output off\n" #else #define DYN_COLOR #endif #ifdef AFL_PERSISTENT_RECORD #define PERSISTENT_MSG \ "AFL_PERSISTENT_RECORD: record the last X inputs to every crash in " \ "out/crashes\n" #else #define PERSISTENT_MSG #endif SAYF( "Environment variables used:\n" "LD_BIND_LAZY: do not set LD_BIND_NOW env var for target\n" "ASAN_OPTIONS: custom settings for ASAN\n" " (must contain abort_on_error=1 and symbolize=0)\n" "MSAN_OPTIONS: custom settings for MSAN\n" " (must contain exitcode="STRINGIFY(MSAN_ERROR)" and symbolize=0)\n" "AFL_AUTORESUME: resume fuzzing if directory specified by -o already exists\n" "AFL_BENCH_JUST_ONE: run the target just once\n" "AFL_BENCH_UNTIL_CRASH: exit soon when the first crashing input has been found\n" "AFL_CMPLOG_ONLY_NEW: do not run cmplog on initial testcases (good for resumes!)\n" "AFL_CRASH_EXITCODE: optional child exit code to be interpreted as crash\n" "AFL_CUSTOM_MUTATOR_LIBRARY: lib with afl_custom_fuzz() to mutate inputs\n" "AFL_CUSTOM_MUTATOR_ONLY: avoid AFL++'s internal mutators\n" "AFL_CYCLE_SCHEDULES: after completing a cycle, switch to a different -p schedule\n" "AFL_DEBUG: extra debugging output for Python mode trimming\n" "AFL_DEBUG_CHILD: do not suppress stdout/stderr from target\n" "AFL_DISABLE_TRIM: disable the trimming of test cases\n" "AFL_DUMB_FORKSRV: use fork server without feedback from target\n" "AFL_EXIT_WHEN_DONE: exit when all inputs are run and no new finds are found\n" "AFL_EXIT_ON_TIME: exit when no new coverage is found within the specified time\n" "AFL_EXIT_ON_SEED_ISSUES: exit on any kind of seed issues\n" "AFL_EXPAND_HAVOC_NOW: immediately enable expand havoc mode (default: after 60\n" " minutes and a cycle without finds)\n" "AFL_FAST_CAL: limit the calibration stage to three cycles for speedup\n" "AFL_FORCE_UI: force showing the status screen (for virtual consoles)\n" "AFL_FORKSRV_INIT_TMOUT: time spent waiting for forkserver during startup (in ms)\n" "AFL_HANG_TMOUT: override timeout value (in milliseconds)\n" "AFL_I_DONT_CARE_ABOUT_MISSING_CRASHES: don't warn about core dump handlers\n" "AFL_IGNORE_PROBLEMS: do not abort fuzzing if an incorrect setup is detected\n" "AFL_IGNORE_PROBLEMS_COVERAGE: if set in addition to AFL_IGNORE_PROBLEMS - also\n" " ignore those libs for coverage\n" "AFL_IGNORE_SEED_PROBLEMS: skip over crashes and timeouts in the seeds instead of\n" " exiting\n" "AFL_IGNORE_TIMEOUTS: do not process or save any timeouts\n" "AFL_IGNORE_UNKNOWN_ENVS: don't warn on unknown env vars\n" "AFL_IMPORT_FIRST: sync and import test cases from other fuzzer instances first\n" "AFL_INPUT_LEN_MIN/AFL_INPUT_LEN_MAX: like -g/-G set min/max fuzz length produced\n" "AFL_PIZZA_MODE: 1 - enforce pizza mode, -1 - disable for April 1st,\n" " 0 (default) - activate on April 1st\n" "AFL_KILL_SIGNAL: Signal ID delivered to child processes on timeout, etc.\n" " (default: SIGKILL)\n" "AFL_FORK_SERVER_KILL_SIGNAL: Kill signal for the fork server on termination\n" " (default: SIGTERM). If unset and AFL_KILL_SIGNAL is\n" " set, that value will be used.\n" "AFL_MAP_SIZE: the shared memory size for that target. must be >= the size\n" " the target was compiled for\n" "AFL_MAX_DET_EXTRAS: if more entries are in the dictionary list than this value\n" " then they are randomly selected instead all of them being\n" " used. Defaults to 200.\n" "AFL_NO_AFFINITY: do not check for an unused cpu core to use for fuzzing\n" "AFL_TRY_AFFINITY: try to bind to an unused core, but don't fail if unsuccessful\n" "AFL_NO_ARITH: skip arithmetic mutations in deterministic stage\n" "AFL_NO_AUTODICT: do not load an offered auto dictionary compiled into a target\n" "AFL_NO_CPU_RED: avoid red color for showing very high cpu usage\n" "AFL_NO_FORKSRV: run target via execve instead of using the forkserver\n" "AFL_NO_SNAPSHOT: do not use the snapshot feature (if the snapshot lkm is loaded)\n" "AFL_NO_STARTUP_CALIBRATION: no initial seed calibration, start fuzzing at once\n" "AFL_NO_WARN_INSTABILITY: no warn about instability issues on startup calibration\n" "AFL_NO_UI: switch status screen off\n" "AFL_NYX_AUX_SIZE: size of the Nyx auxiliary buffer. Must be a multiple of 4096.\n" " Increase this value in case the crash reports are truncated.\n" " Default value is 4096.\n" "AFL_NYX_DISABLE_SNAPSHOT_MODE: disable snapshot mode (must be supported by the agent)\n" "AFL_NYX_LOG: output NYX hprintf messages to another file\n" "AFL_NYX_REUSE_SNAPSHOT: reuse an existing Nyx root snapshot\n" DYN_COLOR "AFL_PATH: path to AFL support binaries\n" "AFL_PYTHON_MODULE: mutate and trim inputs with the specified Python module\n" "AFL_QUIET: suppress forkserver status messages\n" PERSISTENT_MSG "AFL_POST_PROCESS_KEEP_ORIGINAL: save the file as it was prior post-processing to\n" " the queue, but execute the post-processed one\n" "AFL_PRELOAD: LD_PRELOAD / DYLD_INSERT_LIBRARIES settings for target\n" "AFL_TARGET_ENV: pass extra environment variables to target\n" "AFL_SHUFFLE_QUEUE: reorder the input queue randomly on startup\n" "AFL_SKIP_BIN_CHECK: skip afl compatibility checks, also disables auto map size\n" "AFL_SKIP_CPUFREQ: do not warn about variable cpu clocking\n" //"AFL_SKIP_CRASHES: during initial dry run do not terminate for crashing inputs\n" "AFL_STATSD: enables StatsD metrics collection\n" "AFL_STATSD_HOST: change default statsd host (default 127.0.0.1)\n" "AFL_STATSD_PORT: change default statsd port (default: 8125)\n" "AFL_STATSD_TAGS_FLAVOR: set statsd tags format (default: disable tags)\n" " suported formats: dogstatsd, librato, signalfx, influxdb\n" "AFL_SYNC_TIME: sync time between fuzzing instances (in minutes)\n" "AFL_FINAL_SYNC: sync a final time when exiting (will delay the exit!)\n" "AFL_NO_CRASH_README: do not create a README in the crashes directory\n" "AFL_TESTCACHE_SIZE: use a cache for testcases, improves performance (in MB)\n" "AFL_TMPDIR: directory to use for input file generation (ramdisk recommended)\n" "AFL_EARLY_FORKSERVER: force an early forkserver in an afl-clang-fast/\n" " afl-clang-lto/afl-gcc-fast target\n" "AFL_PERSISTENT: enforce persistent mode (if __AFL_LOOP is in a shared lib)\n" "AFL_DEFER_FORKSRV: enforced deferred forkserver (__AFL_INIT is in a shared lib)\n" "AFL_FUZZER_STATS_UPDATE_INTERVAL: interval to update fuzzer_stats file in\n" " seconds (default: 60, minimum: 1)\n" "\n" ); } else { SAYF( "To view also the supported environment variables of afl-fuzz please " "use \"-hh\".\n\n"); } #ifdef USE_PYTHON SAYF("Compiled with %s module support, see docs/custom_mutators.md\n", (char *)PYTHON_VERSION); #else SAYF("Compiled without Python module support.\n"); #endif #ifdef AFL_PERSISTENT_RECORD SAYF("Compiled with AFL_PERSISTENT_RECORD support.\n"); #else SAYF("Compiled without AFL_PERSISTENT_RECORD support.\n"); #endif #ifdef USEMMAP SAYF("Compiled with shm_open support.\n"); #else SAYF("Compiled with shmat support.\n"); #endif #ifdef ASAN_BUILD SAYF("Compiled with ASAN_BUILD.\n"); #endif #ifdef NO_SPLICING SAYF("Compiled with NO_SPLICING.\n"); #endif #ifdef FANCY_BOXES_NO_UTF SAYF("Compiled without UTF-8 support for line rendering in status screen.\n"); #endif #ifdef PROFILING SAYF("Compiled with PROFILING.\n"); #endif #ifdef INTROSPECTION SAYF("Compiled with INTROSPECTION.\n"); #endif #ifdef _DEBUG SAYF("Compiled with _DEBUG.\n"); #endif #ifdef _AFL_DOCUMENT_MUTATIONS SAYF("Compiled with _AFL_DOCUMENT_MUTATIONS.\n"); #endif SAYF("For additional help please consult %s/README.md :)\n\n", doc_path); exit(1); #undef PHYTON_SUPPORT } #ifndef AFL_LIB static int stricmp(char const *a, char const *b) { if (!a || !b) { FATAL("Null reference"); } for (;; ++a, ++b) { int d; d = tolower((int)*a) - tolower((int)*b); if (d != 0 || !*a) { return d; } } } static void fasan_check_afl_preload(char *afl_preload) { char first_preload[PATH_MAX + 1] = {0}; char *separator = strchr(afl_preload, ':'); size_t first_preload_len = PATH_MAX; char *basename; char clang_runtime_prefix[] = "libclang_rt.asan"; if (separator != NULL && (separator - afl_preload) < PATH_MAX) { first_preload_len = separator - afl_preload; } strncpy(first_preload, afl_preload, first_preload_len); basename = strrchr(first_preload, '/'); if (basename == NULL) { basename = first_preload; } else { basename = basename + 1; } if (strncmp(basename, clang_runtime_prefix, sizeof(clang_runtime_prefix) - 1) != 0) { FATAL("Address Sanitizer DSO must be the first DSO in AFL_PRELOAD"); } if (access(first_preload, R_OK) != 0) { FATAL("Address Sanitizer DSO not found"); } OKF("Found ASAN DSO: %s", first_preload); } /* Main entry point */ int main(int argc, char **argv_orig, char **envp) { s32 opt, auto_sync = 0 /*, user_set_cache = 0*/; u64 prev_queued = 0; u32 sync_interval_cnt = 0, seek_to = 0, show_help = 0, default_output = 1, map_size = get_map_size(); u8 *extras_dir[4]; u8 mem_limit_given = 0, exit_1 = 0, debug = 0, extras_dir_cnt = 0 /*, have_p = 0*/; char *afl_preload; char *frida_afl_preload = NULL; char **use_argv; struct timeval tv; struct timezone tz; doc_path = access(DOC_PATH, F_OK) != 0 ? (u8 *)"docs" : (u8 *)DOC_PATH; if (argc > 1 && strcmp(argv_orig[1], "--version") == 0) { printf("afl-fuzz" VERSION "\n"); exit(0); } if (argc > 1 && strcmp(argv_orig[1], "--help") == 0) { usage(argv_orig[0], 1); exit(0); } #if defined USE_COLOR && defined ALWAYS_COLORED if (getenv("AFL_NO_COLOR") || getenv("AFL_NO_COLOUR")) { WARNF( "Setting AFL_NO_COLOR has no effect (colors are configured on at " "compile time)"); } #endif char **argv = argv_cpy_dup(argc, argv_orig); afl_state_t *afl = calloc(1, sizeof(afl_state_t)); if (!afl) { FATAL("Could not create afl state"); } if (get_afl_env("AFL_DEBUG")) { debug = afl->debug = 1; } afl_state_init(afl, map_size); afl->debug = debug; afl_fsrv_init(&afl->fsrv); if (debug) { afl->fsrv.debug = true; } read_afl_environment(afl, envp); if (afl->shm.map_size) { afl->fsrv.map_size = afl->shm.map_size; } exit_1 = !!afl->afl_env.afl_bench_just_one; SAYF(cCYA "afl-fuzz" VERSION cRST " based on afl by Michal Zalewski and a large online community\n"); gettimeofday(&tv, &tz); rand_set_seed(afl, tv.tv_sec ^ tv.tv_usec ^ getpid()); afl->shmem_testcase_mode = 1; // we always try to perform shmem fuzzing // still available: HjJkKqruvwz while ((opt = getopt(argc, argv, "+a:Ab:B:c:CdDe:E:f:F:g:G:hi:I:l:L:m:M:nNo:Op:P:QRs:S:t:" "T:UV:WXx:YZ")) > 0) { switch (opt) { case 'a': if (!stricmp(optarg, "text") || !stricmp(optarg, "ascii") || !stricmp(optarg, "txt") || !stricmp(optarg, "asc")) { afl->input_mode = 1; } else if (!stricmp(optarg, "bin") || !stricmp(optarg, "binary")) { afl->input_mode = 2; } else if (!stricmp(optarg, "def") || !stricmp(optarg, "default")) { afl->input_mode = 0; } else { FATAL("-a input mode needs to be \"text\" or \"binary\"."); } break; case 'P': if (!stricmp(optarg, "explore") || !stricmp(optarg, "exploration")) { afl->fuzz_mode = 0; afl->switch_fuzz_mode = 0; } else if (!stricmp(optarg, "exploit") || !stricmp(optarg, "exploitation")) { afl->fuzz_mode = 1; afl->switch_fuzz_mode = 0; } else { if ((afl->switch_fuzz_mode = (u32)atoi(optarg)) > INT_MAX) { FATAL( "Parameter for option -P must be \"explore\", \"exploit\" or a " "number!"); } else { afl->switch_fuzz_mode *= 1000; } } break; case 'g': afl->min_length = atoi(optarg); break; case 'G': afl->max_length = atoi(optarg); break; case 'Z': afl->old_seed_selection = 1; break; case 'I': afl->infoexec = optarg; break; case 'b': { /* bind CPU core */ if (afl->cpu_to_bind != -1) FATAL("Multiple -b options not supported"); if (sscanf(optarg, "%d", &afl->cpu_to_bind) < 0) { FATAL("Bad syntax used for -b"); } break; } case 'c': { if (strcmp(optarg, "-") == 0) { if (afl->shm.cmplog_mode) { ACTF("Disabling cmplog again because of '-c -'."); afl->shm.cmplog_mode = 0; afl->cmplog_binary = NULL; } } else { afl->shm.cmplog_mode = 1; afl->cmplog_binary = ck_strdup(optarg); } break; } case 's': { if (optarg == NULL) { FATAL("No valid seed provided. Got NULL."); } rand_set_seed(afl, strtoul(optarg, 0L, 10)); afl->fixed_seed = 1; break; } case 'p': /* Power schedule */ if (!stricmp(optarg, "fast")) { afl->schedule = FAST; } else if (!stricmp(optarg, "coe")) { afl->schedule = COE; } else if (!stricmp(optarg, "exploit")) { afl->schedule = EXPLOIT; } else if (!stricmp(optarg, "lin")) { afl->schedule = LIN; } else if (!stricmp(optarg, "quad")) { afl->schedule = QUAD; } else if (!stricmp(optarg, "mopt") || !stricmp(optarg, "mmopt")) { afl->schedule = MMOPT; } else if (!stricmp(optarg, "rare")) { afl->schedule = RARE; } else if (!stricmp(optarg, "explore") || !stricmp(optarg, "afl") || !stricmp(optarg, "default") || !stricmp(optarg, "normal")) { afl->schedule = EXPLORE; } else if (!stricmp(optarg, "seek")) { afl->schedule = SEEK; } else { FATAL("Unknown -p power schedule"); } // have_p = 1; break; case 'e': if (afl->file_extension) { FATAL("Multiple -e options not supported"); } afl->file_extension = optarg; break; case 'i': /* input dir */ if (afl->in_dir) { FATAL("Multiple -i options not supported"); } if (optarg == NULL) { FATAL("Invalid -i option (got NULL)."); } afl->in_dir = optarg; if (!strcmp(afl->in_dir, "-")) { afl->in_place_resume = 1; } break; case 'o': /* output dir */ if (afl->out_dir) { FATAL("Multiple -o options not supported"); } afl->out_dir = optarg; break; case 'M': { /* main sync ID */ u8 *c; if (afl->non_instrumented_mode) { FATAL("-M is not supported in non-instrumented mode"); } if (afl->fsrv.cs_mode) { FATAL("-M is not supported in ARM CoreSight mode"); } if (afl->sync_id) { FATAL("Multiple -S or -M options not supported"); } /* sanity check for argument: should not begin with '-' (possible * option) */ if (optarg && *optarg == '-') { FATAL( "argument for -M started with a dash '-', which is used for " "options"); } afl->sync_id = ck_strdup(optarg); afl->old_seed_selection = 1; // force old queue walking seed selection afl->disable_trim = 1; // disable trimming if ((c = strchr(afl->sync_id, ':'))) { *c = 0; if (sscanf(c + 1, "%u/%u", &afl->main_node_id, &afl->main_node_max) != 2 || !afl->main_node_id || !afl->main_node_max || afl->main_node_id > afl->main_node_max || afl->main_node_max > 1000000) { FATAL("Bogus main node ID passed to -M"); } } afl->is_main_node = 1; } break; case 'S': /* secondary sync id */ if (afl->non_instrumented_mode) { FATAL("-S is not supported in non-instrumented mode"); } if (afl->fsrv.cs_mode) { FATAL("-S is not supported in ARM CoreSight mode"); } if (afl->sync_id) { FATAL("Multiple -S or -M options not supported"); } /* sanity check for argument: should not begin with '-' (possible * option) */ if (optarg && *optarg == '-') { FATAL( "argument for -M started with a dash '-', which is used for " "options"); } afl->sync_id = ck_strdup(optarg); afl->is_secondary_node = 1; break; case 'F': /* foreign sync dir */ if (!optarg) { FATAL("Missing path for -F"); } if (!afl->is_main_node) { FATAL( "Option -F can only be specified after the -M option for the " "main fuzzer of a fuzzing campaign"); } if (afl->foreign_sync_cnt >= FOREIGN_SYNCS_MAX) { FATAL("Maximum %u entried of -F option can be specified", FOREIGN_SYNCS_MAX); } afl->foreign_syncs[afl->foreign_sync_cnt].dir = optarg; while (afl->foreign_syncs[afl->foreign_sync_cnt] .dir[strlen(afl->foreign_syncs[afl->foreign_sync_cnt].dir) - 1] == '/') { afl->foreign_syncs[afl->foreign_sync_cnt] .dir[strlen(afl->foreign_syncs[afl->foreign_sync_cnt].dir) - 1] = 0; } afl->foreign_sync_cnt++; break; case 'f': /* target file */ if (afl->fsrv.out_file) { FATAL("Multiple -f options not supported"); } afl->fsrv.out_file = ck_strdup(optarg); afl->fsrv.use_stdin = 0; default_output = 0; break; case 'x': /* dictionary */ if (extras_dir_cnt >= 4) { FATAL("More than four -x options are not supported"); } extras_dir[extras_dir_cnt++] = optarg; break; case 't': { /* timeout */ u8 suffix = 0; if (afl->timeout_given) { FATAL("Multiple -t options not supported"); } if (!optarg || sscanf(optarg, "%u%c", &afl->fsrv.exec_tmout, &suffix) < 1 || optarg[0] == '-') { FATAL("Bad syntax used for -t"); } if (afl->fsrv.exec_tmout < 5) { FATAL("Dangerously low value of -t"); } if (suffix == '+') { afl->timeout_given = 2; } else { afl->timeout_given = 1; } break; } case 'm': { /* mem limit */ u8 suffix = 'M'; if (mem_limit_given) { FATAL("Multiple -m options not supported"); } mem_limit_given = 1; if (!optarg) { FATAL("Wrong usage of -m"); } if (!strcmp(optarg, "none")) { afl->fsrv.mem_limit = 0; break; } if (sscanf(optarg, "%llu%c", &afl->fsrv.mem_limit, &suffix) < 1 || optarg[0] == '-') { FATAL("Bad syntax used for -m"); } switch (suffix) { case 'T': afl->fsrv.mem_limit *= 1024 * 1024; break; case 'G': afl->fsrv.mem_limit *= 1024; break; case 'k': afl->fsrv.mem_limit /= 1024; break; case 'M': break; default: FATAL("Unsupported suffix or bad syntax for -m"); } if (afl->fsrv.mem_limit < 5) { FATAL("Dangerously low value of -m"); } if (sizeof(rlim_t) == 4 && afl->fsrv.mem_limit > 2000) { FATAL("Value of -m out of range on 32-bit systems"); } } break; case 'D': /* partial deterministic */ afl->skip_deterministic = 0; break; case 'd': /* no deterministic */ // this is the default and currently a lot of infrastructure enforces // it (e.g. clusterfuzz, fuzzbench) based on that this feature // originally was bad performance wise. We now have a better // implementation, hence if it is activated, we do not want to // deactivate it by such setups. // afl->skip_deterministic = 1; break; case 'B': /* load bitmap */ /* This is a secret undocumented option! It is useful if you find an interesting test case during a normal fuzzing process, and want to mutate it without rediscovering any of the test cases already found during an earlier run. To use this mode, you need to point -B to the fuzz_bitmap produced by an earlier run for the exact same binary... and that's it. I only used this once or twice to get variants of a particular file, so I'm not making this an official setting. */ if (afl->in_bitmap) { FATAL("Multiple -B options not supported"); } afl->in_bitmap = optarg; break; case 'C': /* crash mode */ if (afl->crash_mode) { FATAL("Multiple -C options not supported"); } afl->crash_mode = FSRV_RUN_CRASH; break; case 'n': /* dumb mode */ if (afl->is_main_node || afl->is_secondary_node) { FATAL("Non instrumented mode is not supported with -M / -S"); } if (afl->non_instrumented_mode) { FATAL("Multiple -n options not supported"); } if (afl->afl_env.afl_dumb_forksrv) { afl->non_instrumented_mode = 2; } else { afl->non_instrumented_mode = 1; } break; case 'T': /* banner */ if (afl->use_banner) { FATAL("Multiple -T options not supported"); } afl->use_banner = optarg; break; #ifdef __linux__ case 'X': /* NYX mode */ if (afl->fsrv.nyx_mode) { FATAL("Multiple -X options not supported"); } afl->fsrv.nyx_parent = true; afl->fsrv.nyx_standalone = true; afl->fsrv.nyx_mode = 1; afl->fsrv.nyx_id = 0; break; case 'Y': /* NYX distributed mode */ if (afl->fsrv.nyx_mode) { FATAL("Multiple -Y options not supported"); } afl->fsrv.nyx_mode = 1; break; #else case 'X': case 'Y': FATAL("Nyx mode is only availabe on linux..."); break; #endif case 'A': /* CoreSight mode */ #if !defined(__aarch64__) || !defined(__linux__) FATAL("-A option is not supported on this platform"); #endif if (afl->is_main_node || afl->is_secondary_node) { FATAL("ARM CoreSight mode is not supported with -M / -S"); } if (afl->fsrv.cs_mode) { FATAL("Multiple -A options not supported"); } afl->fsrv.cs_mode = 1; break; case 'O': /* FRIDA mode */ if (afl->fsrv.frida_mode) { FATAL("Multiple -O options not supported"); } afl->fsrv.frida_mode = 1; if (get_afl_env("AFL_USE_FASAN")) { afl->fsrv.frida_asan = 1; } break; case 'Q': /* QEMU mode */ if (afl->fsrv.qemu_mode) { FATAL("Multiple -Q options not supported"); } afl->fsrv.qemu_mode = 1; if (!mem_limit_given) { afl->fsrv.mem_limit = MEM_LIMIT_QEMU; } break; case 'N': /* Unicorn mode */ if (afl->no_unlink) { FATAL("Multiple -N options not supported"); } afl->fsrv.no_unlink = (afl->no_unlink = true); break; case 'U': /* Unicorn mode */ if (afl->unicorn_mode) { FATAL("Multiple -U options not supported"); } afl->unicorn_mode = 1; if (!mem_limit_given) { afl->fsrv.mem_limit = MEM_LIMIT_UNICORN; } break; case 'W': /* Wine+QEMU mode */ if (afl->use_wine) { FATAL("Multiple -W options not supported"); } afl->fsrv.qemu_mode = 1; afl->use_wine = 1; if (!mem_limit_given) { afl->fsrv.mem_limit = 0; } break; case 'V': { afl->most_time_key = 1; if (!optarg || sscanf(optarg, "%llu", &afl->most_time) < 1 || optarg[0] == '-') { FATAL("Bad syntax used for -V"); } } break; case 'E': { afl->most_execs_key = 1; if (!optarg || sscanf(optarg, "%llu", &afl->most_execs) < 1 || optarg[0] == '-') { FATAL("Bad syntax used for -E"); } } break; case 'l': { if (!optarg) { FATAL("missing parameter for 'l'"); } char *c = optarg; while (*c) { switch (*c) { case '0': case '1': afl->cmplog_lvl = 1; break; case '2': afl->cmplog_lvl = 2; break; case '3': afl->cmplog_lvl = 3; if (!afl->disable_trim) { ACTF("Deactivating trimming due CMPLOG level 3"); afl->disable_trim = 1; } break; case 'a': case 'A': afl->cmplog_enable_arith = 1; break; case 's': case 'S': afl->cmplog_enable_scale = 1; break; case 't': case 'T': afl->cmplog_enable_transform = 1; break; case 'x': case 'X': afl->cmplog_enable_xtreme_transform = 1; break; case 'r': case 'R': afl->cmplog_random_colorization = 1; break; default: FATAL("Unknown option value '%c' in -l %s", *c, optarg); } ++c; } if (afl->cmplog_lvl == CMPLOG_LVL_MAX) { afl->cmplog_max_filesize = MAX_FILE; } } break; case 'L': { /* MOpt mode */ if (afl->limit_time_sig) { FATAL("Multiple -L options not supported"); } afl->havoc_max_mult = HAVOC_MAX_MULT_MOPT; if (sscanf(optarg, "%d", &afl->limit_time_puppet) < 1) { FATAL("Bad syntax used for -L"); } if (afl->limit_time_puppet == -1) { afl->limit_time_sig = -1; afl->limit_time_puppet = 0; } else if (afl->limit_time_puppet < 0) { FATAL("-L value must be between 0 and 2000000 or -1"); } else { afl->limit_time_sig = 1; } u64 limit_time_puppet2 = afl->limit_time_puppet * 60 * 1000; if ((s32)limit_time_puppet2 < afl->limit_time_puppet) { FATAL("limit_time overflow"); } afl->limit_time_puppet = limit_time_puppet2; afl->swarm_now = 0; if (afl->limit_time_puppet == 0) { afl->key_puppet = 1; } int j; int tmp_swarm = 0; if (afl->g_now > afl->g_max) { afl->g_now = 0; } afl->w_now = (afl->w_init - afl->w_end) * (afl->g_max - afl->g_now) / (afl->g_max) + afl->w_end; for (tmp_swarm = 0; tmp_swarm < swarm_num; ++tmp_swarm) { double total_puppet_temp = 0.0; afl->swarm_fitness[tmp_swarm] = 0.0; for (j = 0; j < operator_num; ++j) { afl->stage_finds_puppet[tmp_swarm][j] = 0; afl->probability_now[tmp_swarm][j] = 0.0; afl->x_now[tmp_swarm][j] = ((double)(random() % 7000) * 0.0001 + 0.1); total_puppet_temp += afl->x_now[tmp_swarm][j]; afl->v_now[tmp_swarm][j] = 0.1; afl->L_best[tmp_swarm][j] = 0.5; afl->G_best[j] = 0.5; afl->eff_best[tmp_swarm][j] = 0.0; } for (j = 0; j < operator_num; ++j) { afl->stage_cycles_puppet_v2[tmp_swarm][j] = afl->stage_cycles_puppet[tmp_swarm][j]; afl->stage_finds_puppet_v2[tmp_swarm][j] = afl->stage_finds_puppet[tmp_swarm][j]; afl->x_now[tmp_swarm][j] = afl->x_now[tmp_swarm][j] / total_puppet_temp; } double x_temp = 0.0; for (j = 0; j < operator_num; ++j) { afl->probability_now[tmp_swarm][j] = 0.0; afl->v_now[tmp_swarm][j] = afl->w_now * afl->v_now[tmp_swarm][j] + RAND_C * (afl->L_best[tmp_swarm][j] - afl->x_now[tmp_swarm][j]) + RAND_C * (afl->G_best[j] - afl->x_now[tmp_swarm][j]); afl->x_now[tmp_swarm][j] += afl->v_now[tmp_swarm][j]; if (afl->x_now[tmp_swarm][j] > v_max) { afl->x_now[tmp_swarm][j] = v_max; } else if (afl->x_now[tmp_swarm][j] < v_min) { afl->x_now[tmp_swarm][j] = v_min; } x_temp += afl->x_now[tmp_swarm][j]; } for (j = 0; j < operator_num; ++j) { afl->x_now[tmp_swarm][j] = afl->x_now[tmp_swarm][j] / x_temp; if (likely(j != 0)) { afl->probability_now[tmp_swarm][j] = afl->probability_now[tmp_swarm][j - 1] + afl->x_now[tmp_swarm][j]; } else { afl->probability_now[tmp_swarm][j] = afl->x_now[tmp_swarm][j]; } } if (afl->probability_now[tmp_swarm][operator_num - 1] < 0.99 || afl->probability_now[tmp_swarm][operator_num - 1] > 1.01) { FATAL("ERROR probability"); } } for (j = 0; j < operator_num; ++j) { afl->core_operator_finds_puppet[j] = 0; afl->core_operator_finds_puppet_v2[j] = 0; afl->core_operator_cycles_puppet[j] = 0; afl->core_operator_cycles_puppet_v2[j] = 0; afl->core_operator_cycles_puppet_v3[j] = 0; } WARNF( "Note that the MOpt mode is not maintained and is not as effective " "as normal havoc mode."); } break; case 'h': show_help++; break; // not needed case 'R': FATAL( "Radamsa is now a custom mutator, please use that " "(custom_mutators/radamsa/)."); break; default: if (!show_help) { show_help = 1; } } } if (afl->sync_id && strcmp(afl->sync_id, "addseeds") == 0) { FATAL("-M/-S name 'addseeds' is a reserved name, choose something else"); } if (afl->is_main_node == 1 && afl->schedule != FAST && afl->schedule != EXPLORE) { FATAL("-M is compatible only with fast and explore -p power schedules"); } if (optind == argc || !afl->in_dir || !afl->out_dir || show_help) { usage(argv[0], show_help); } if (unlikely(afl->afl_env.afl_persistent_record)) { #ifdef AFL_PERSISTENT_RECORD afl->fsrv.persistent_record = atoi(afl->afl_env.afl_persistent_record); if (afl->fsrv.persistent_record < 2) { FATAL( "AFL_PERSISTENT_RECORD value must be be at least 2, recommended is " "100 or 1000."); } #else FATAL( "afl-fuzz was not compiled with AFL_PERSISTENT_RECORD enabled in " "config.h!"); #endif } if (afl->fsrv.mem_limit && afl->shm.cmplog_mode) afl->fsrv.mem_limit += 260; OKF("AFL++ is maintained by Marc \"van Hauser\" Heuse, Dominik Maier, Andrea " "Fioraldi and Heiko \"hexcoder\" Eißfeldt"); OKF("AFL++ is open source, get it at " "https://github.com/AFLplusplus/AFLplusplus"); OKF("NOTE: AFL++ >= v3 has changed defaults and behaviours - see README.md"); #ifdef __linux__ if (afl->fsrv.nyx_mode) { OKF("AFL++ Nyx mode is enabled (developed and mainted by Sergej Schumilo)"); OKF("Nyx is open source, get it at https://github.com/Nyx-Fuzz"); } #endif // silently disable deterministic mutation if custom mutators are used if (!afl->skip_deterministic && afl->afl_env.afl_custom_mutator_only) { afl->skip_deterministic = 1; } if (afl->fixed_seed) { OKF("Running with fixed seed: %u", (u32)afl->init_seed); } #if defined(__SANITIZE_ADDRESS__) if (afl->fsrv.mem_limit) { WARNF("in the ASAN build we disable all memory limits"); afl->fsrv.mem_limit = 0; } #endif configure_afl_kill_signals(&afl->fsrv, afl->afl_env.afl_child_kill_signal, afl->afl_env.afl_fsrv_kill_signal, (afl->fsrv.qemu_mode || afl->unicorn_mode #ifdef __linux__ || afl->fsrv.nyx_mode #endif ) ? SIGKILL : SIGTERM); setup_signal_handlers(); check_asan_opts(afl); afl->power_name = power_names[afl->schedule]; if (!afl->non_instrumented_mode && !afl->sync_id) { auto_sync = 1; afl->sync_id = ck_strdup("default"); afl->is_secondary_node = 1; OKF("No -M/-S set, autoconfiguring for \"-S %s\"", afl->sync_id); } #ifdef __linux__ if (afl->fsrv.nyx_mode) { if (afl->fsrv.nyx_standalone && strcmp(afl->sync_id, "default") != 0) { FATAL( "distributed fuzzing is not supported in this Nyx mode (use -Y " "instead)"); } if (!afl->fsrv.nyx_standalone) { if (afl->is_main_node) { if (strcmp("0", afl->sync_id) != 0) { FATAL( "for Nyx -Y mode, the Main (-M) parameter has to be set to 0 (-M " "0)"); } afl->fsrv.nyx_parent = true; afl->fsrv.nyx_id = 0; } if (afl->is_secondary_node) { long nyx_id = strtol(afl->sync_id, NULL, 10); if (nyx_id == 0 || nyx_id == LONG_MAX) { FATAL( "for Nyx -Y mode, the Secondary (-S) parameter has to be a " "numeric value and >= 1 (e.g. -S 1)"); } afl->fsrv.nyx_id = nyx_id; } } } #endif if (afl->sync_id) { if (strlen(afl->sync_id) > 50) { FATAL("sync_id max length is 50 characters"); } fix_up_sync(afl); } if (!strcmp(afl->in_dir, afl->out_dir)) { FATAL("Input and output directories can't be the same"); } if (afl->non_instrumented_mode) { if (afl->crash_mode) { FATAL("-C and -n are mutually exclusive"); } if (afl->fsrv.frida_mode) { FATAL("-O and -n are mutually exclusive"); } if (afl->fsrv.qemu_mode) { FATAL("-Q and -n are mutually exclusive"); } if (afl->fsrv.cs_mode) { FATAL("-A and -n are mutually exclusive"); } if (afl->unicorn_mode) { FATAL("-U and -n are mutually exclusive"); } } setenv("__AFL_OUT_DIR", afl->out_dir, 1); if (get_afl_env("AFL_DISABLE_TRIM")) { afl->disable_trim = 1; } if (getenv("AFL_NO_UI") && getenv("AFL_FORCE_UI")) { FATAL("AFL_NO_UI and AFL_FORCE_UI are mutually exclusive"); } if (unlikely(afl->afl_env.afl_statsd)) { statsd_setup_format(afl); } if (!afl->use_banner) { afl->use_banner = argv[optind]; } if (afl->shm.cmplog_mode && strcmp("0", afl->cmplog_binary) == 0) { afl->cmplog_binary = strdup(argv[optind]); } if (strchr(argv[optind], '/') == NULL && !afl->unicorn_mode) { WARNF(cLRD "Target binary called without a prefixed path, make sure you are " "fuzzing the right binary: " cRST "%s", argv[optind]); } ACTF("Getting to work..."); switch (afl->schedule) { case FAST: OKF("Using exponential power schedule (FAST)"); break; case COE: OKF("Using cut-off exponential power schedule (COE)"); break; case EXPLOIT: OKF("Using exploitation-based constant power schedule (EXPLOIT)"); break; case LIN: OKF("Using linear power schedule (LIN)"); break; case QUAD: OKF("Using quadratic power schedule (QUAD)"); break; case MMOPT: OKF("Using modified MOpt power schedule (MMOPT)"); break; case RARE: OKF("Using rare edge focus power schedule (RARE)"); break; case SEEK: OKF("Using seek power schedule (SEEK)"); break; case EXPLORE: OKF("Using exploration-based constant power schedule (EXPLORE)"); break; default: FATAL("Unknown power schedule"); break; } if (afl->shm.cmplog_mode) { OKF("CmpLog level: %u", afl->cmplog_lvl); } /* Dynamically allocate memory for AFLFast schedules */ if (afl->schedule >= FAST && afl->schedule <= RARE) { afl->n_fuzz = ck_alloc(N_FUZZ_SIZE * sizeof(u32)); } if (get_afl_env("AFL_NO_FORKSRV")) { afl->no_forkserver = 1; } if (get_afl_env("AFL_NO_CPU_RED")) { afl->no_cpu_meter_red = 1; } if (get_afl_env("AFL_NO_ARITH")) { afl->no_arith = 1; } if (get_afl_env("AFL_SHUFFLE_QUEUE")) { afl->shuffle_queue = 1; } if (get_afl_env("AFL_EXPAND_HAVOC_NOW")) { afl->expand_havoc = 1; } if (afl->afl_env.afl_autoresume) { afl->autoresume = 1; if (afl->in_place_resume) { SAYF("AFL_AUTORESUME has no effect for '-i -'"); } } if (afl->afl_env.afl_hang_tmout) { s32 hang_tmout = atoi(afl->afl_env.afl_hang_tmout); if (hang_tmout < 1) { FATAL("Invalid value for AFL_HANG_TMOUT"); } afl->hang_tmout = (u32)hang_tmout; } if (afl->afl_env.afl_exit_on_time) { u64 exit_on_time = atoi(afl->afl_env.afl_exit_on_time); afl->exit_on_time = (u64)exit_on_time * 1000; } if (afl->afl_env.afl_max_det_extras) { s32 max_det_extras = atoi(afl->afl_env.afl_max_det_extras); if (max_det_extras < 1) { FATAL("Invalid value for AFL_MAX_DET_EXTRAS"); } afl->max_det_extras = (u32)max_det_extras; } else { afl->max_det_extras = MAX_DET_EXTRAS; } if (afl->afl_env.afl_testcache_size) { afl->q_testcase_max_cache_size = (u64)atoi(afl->afl_env.afl_testcache_size) * 1048576; } if (afl->afl_env.afl_testcache_entries) { afl->q_testcase_max_cache_entries = (u32)atoi(afl->afl_env.afl_testcache_entries); // user_set_cache = 1; } if (!afl->afl_env.afl_testcache_size || !afl->afl_env.afl_testcache_entries) { afl->afl_env.afl_testcache_entries = 0; afl->afl_env.afl_testcache_size = 0; } if (!afl->q_testcase_max_cache_size) { ACTF( "No testcache was configured. it is recommended to use a testcache, it " "improves performance: set AFL_TESTCACHE_SIZE=(value in MB)"); } else if (afl->q_testcase_max_cache_size < 2 * MAX_FILE) { FATAL("AFL_TESTCACHE_SIZE must be set to %ld or more, or 0 to disable", (2 * MAX_FILE) % 1048576 == 0 ? (2 * MAX_FILE) / 1048576 : 1 + ((2 * MAX_FILE) / 1048576)); } else { OKF("Enabled testcache with %llu MB", afl->q_testcase_max_cache_size / 1048576); } if (afl->afl_env.afl_forksrv_init_tmout) { afl->fsrv.init_tmout = atoi(afl->afl_env.afl_forksrv_init_tmout); if (!afl->fsrv.init_tmout) { FATAL("Invalid value of AFL_FORKSRV_INIT_TMOUT"); } } else { afl->fsrv.init_tmout = afl->fsrv.exec_tmout * FORK_WAIT_MULT; } if (afl->afl_env.afl_crash_exitcode) { long exitcode = strtol(afl->afl_env.afl_crash_exitcode, NULL, 10); if ((!exitcode && (errno == EINVAL || errno == ERANGE)) || exitcode < -127 || exitcode > 128) { FATAL("Invalid crash exitcode, expected -127 to 128, but got %s", afl->afl_env.afl_crash_exitcode); } afl->fsrv.uses_crash_exitcode = true; // WEXITSTATUS is 8 bit unsigned afl->fsrv.crash_exitcode = (u8)exitcode; } if (afl->non_instrumented_mode == 2 && afl->no_forkserver) { FATAL("AFL_DUMB_FORKSRV and AFL_NO_FORKSRV are mutually exclusive"); } // Marker: ADD_TO_INJECTIONS if (getenv("AFL_LLVM_INJECTIONS_ALL") || getenv("AFL_LLVM_INJECTIONS_SQL") || getenv("AFL_LLVM_INJECTIONS_LDAP") || getenv("AFL_LLVM_INJECTIONS_XSS")) { OKF("Adding injection tokens to dictionary."); if (getenv("AFL_LLVM_INJECTIONS_ALL") || getenv("AFL_LLVM_INJECTIONS_SQL")) { add_extra(afl, "'\"\"'", 4); } if (getenv("AFL_LLVM_INJECTIONS_ALL") || getenv("AFL_LLVM_INJECTIONS_LDAP")) { add_extra(afl, "*)(1=*))(|", 10); } if (getenv("AFL_LLVM_INJECTIONS_ALL") || getenv("AFL_LLVM_INJECTIONS_XSS")) { add_extra(afl, "1\"><\"", 5); } } OKF("Generating fuzz data with a length of min=%u max=%u", afl->min_length, afl->max_length); u32 min_alloc = MAX(64U, afl->min_length); afl_realloc(AFL_BUF_PARAM(in_scratch), min_alloc); afl_realloc(AFL_BUF_PARAM(in), min_alloc); afl_realloc(AFL_BUF_PARAM(out_scratch), min_alloc); afl_realloc(AFL_BUF_PARAM(out), min_alloc); afl_realloc(AFL_BUF_PARAM(eff), min_alloc); afl_realloc(AFL_BUF_PARAM(ex), min_alloc); afl->fsrv.use_fauxsrv = afl->non_instrumented_mode == 1 || afl->no_forkserver; #ifdef __linux__ if (!afl->fsrv.nyx_mode) { check_crash_handling(); check_cpu_governor(afl); } else { u8 *libnyx_binary = find_afl_binary(argv[0], "libnyx.so"); afl->fsrv.nyx_handlers = afl_load_libnyx_plugin(libnyx_binary); if (afl->fsrv.nyx_handlers == NULL) { FATAL("failed to initialize libnyx.so..."); } } #else check_crash_handling(); check_cpu_governor(afl); #endif #ifdef __APPLE__ setenv("DYLD_NO_PIE", "1", 0); #endif if (getenv("LD_PRELOAD")) { WARNF( "LD_PRELOAD is set, are you sure that is what you want to do " "instead of using AFL_PRELOAD?"); } if (afl->afl_env.afl_preload) { if (afl->fsrv.qemu_mode) { /* afl-qemu-trace takes care of converting AFL_PRELOAD. */ } else if (afl->fsrv.frida_mode) { afl_preload = getenv("AFL_PRELOAD"); u8 *frida_binary = find_afl_binary(argv[0], "afl-frida-trace.so"); OKF("Injecting %s ...", frida_binary); if (afl_preload) { if (afl->fsrv.frida_asan) { OKF("Using Frida Address Sanitizer Mode"); fasan_check_afl_preload(afl_preload); setenv("ASAN_OPTIONS", "detect_leaks=false", 1); } u8 *frida_binary = find_afl_binary(argv[0], "afl-frida-trace.so"); OKF("Injecting %s ...", frida_binary); frida_afl_preload = alloc_printf("%s:%s", afl_preload, frida_binary); ck_free(frida_binary); setenv("LD_PRELOAD", frida_afl_preload, 1); setenv("DYLD_INSERT_LIBRARIES", frida_afl_preload, 1); } } else { /* CoreSight mode uses the default behavior. */ setenv("LD_PRELOAD", getenv("AFL_PRELOAD"), 1); setenv("DYLD_INSERT_LIBRARIES", getenv("AFL_PRELOAD"), 1); } } else if (afl->fsrv.frida_mode) { if (afl->fsrv.frida_asan) { OKF("Using Frida Address Sanitizer Mode"); FATAL( "Address Sanitizer DSO must be loaded using AFL_PRELOAD in Frida " "Address Sanitizer Mode"); } else { u8 *frida_binary = find_afl_binary(argv[0], "afl-frida-trace.so"); OKF("Injecting %s ...", frida_binary); setenv("LD_PRELOAD", frida_binary, 1); setenv("DYLD_INSERT_LIBRARIES", frida_binary, 1); ck_free(frida_binary); } } if (getenv("AFL_LD_PRELOAD")) { FATAL("Use AFL_PRELOAD instead of AFL_LD_PRELOAD"); } if (afl->afl_env.afl_target_env && !extract_and_set_env(afl->afl_env.afl_target_env)) { FATAL("Bad value of AFL_TARGET_ENV"); } save_cmdline(afl, argc, argv); check_if_tty(afl); if (afl->afl_env.afl_force_ui) { afl->not_on_tty = 0; } get_core_count(afl); atexit(at_exit); setup_dirs_fds(afl); #ifdef HAVE_AFFINITY bind_to_free_cpu(afl); #endif /* HAVE_AFFINITY */ #ifdef __linux__ if (afl->fsrv.nyx_mode && afl->fsrv.nyx_bind_cpu_id == 0xFFFFFFFF) { afl->fsrv.nyx_bind_cpu_id = 0; } #endif #ifdef __HAIKU__ /* Prioritizes performance over power saving */ set_scheduler_mode(SCHEDULER_MODE_LOW_LATENCY); #endif #ifdef __APPLE__ if (pthread_set_qos_class_self_np(QOS_CLASS_USER_INTERACTIVE, 0) != 0) { WARNF("general thread priority settings failed"); } #endif init_count_class16(); if (afl->is_main_node && check_main_node_exists(afl) == 1) { WARNF("it is wasteful to run more than one main node!"); sleep(1); } else if (!auto_sync && afl->is_secondary_node && check_main_node_exists(afl) == 0) { WARNF( "no -M main node found. It is recommended to run exactly one main " "instance."); sleep(1); } #ifdef RAND_TEST_VALUES u32 counter; for (counter = 0; counter < 100000; counter++) printf("DEBUG: rand %06d is %u\n", counter, rand_below(afl, 65536)); #endif if (!getenv("AFL_CUSTOM_INFO_PROGRAM")) { setenv("AFL_CUSTOM_INFO_PROGRAM", argv[optind], 1); } if (!getenv("AFL_CUSTOM_INFO_PROGRAM_INPUT") && afl->fsrv.out_file) { setenv("AFL_CUSTOM_INFO_PROGRAM_INPUT", afl->fsrv.out_file, 1); } if (!getenv("AFL_CUSTOM_INFO_PROGRAM_ARGV")) { u8 envbuf[8096] = "", tmpbuf[8096] = ""; for (s32 i = optind + 1; i < argc; ++i) { strcpy(tmpbuf, envbuf); if (strchr(argv[i], ' ') && !strchr(argv[i], '"') && !strchr(argv[i], '\'')) { if (!strchr(argv[i], '\'')) { snprintf(envbuf, sizeof(tmpbuf), "%s '%s'", tmpbuf, argv[i]); } else { snprintf(envbuf, sizeof(tmpbuf), "%s \"%s\"", tmpbuf, argv[i]); } } else { snprintf(envbuf, sizeof(tmpbuf), "%s %s", tmpbuf, argv[i]); } } setenv("AFL_CUSTOM_INFO_PROGRAM_ARGV", envbuf + 1, 1); } if (!getenv("AFL_CUSTOM_INFO_OUT")) { setenv("AFL_CUSTOM_INFO_OUT", afl->out_dir, 1); // same as __AFL_OUT_DIR } setup_custom_mutators(afl); if (afl->afl_env.afl_custom_mutator_only) { if (!afl->custom_mutators_count) { if (afl->shm.cmplog_mode) { WARNF( "No custom mutator loaded, using AFL_CUSTOM_MUTATOR_ONLY is " "pointless and only allowed now to allow experiments with CMPLOG."); } else { FATAL( "No custom mutator loaded but AFL_CUSTOM_MUTATOR_ONLY specified."); } } /* This ensures we don't proceed to havoc/splice */ afl->custom_only = 1; /* Ensure we also skip all deterministic steps */ afl->skip_deterministic = 1; } if (afl->limit_time_sig > 0 && afl->custom_mutators_count) { if (afl->custom_only) { FATAL("Custom mutators are incompatible with MOpt (-L)"); } u32 custom_fuzz = 0; LIST_FOREACH(&afl->custom_mutator_list, struct custom_mutator, { if (el->afl_custom_fuzz) { custom_fuzz = 1; } }); if (custom_fuzz) { WARNF("afl_custom_fuzz is incompatible with MOpt (-L)"); } } write_setup_file(afl, argc, argv); setup_cmdline_file(afl, argv + optind); read_testcases(afl, NULL); // read_foreign_testcases(afl, 1); for the moment dont do this OKF("Loaded a total of %u seeds.", afl->queued_items); pivot_inputs(afl); if (!afl->timeout_given) { find_timeout(afl); } // only for resumes! if ((afl->tmp_dir = afl->afl_env.afl_tmpdir) != NULL && !afl->in_place_resume) { char tmpfile[PATH_MAX]; if (afl->file_extension) { snprintf(tmpfile, PATH_MAX, "%s/.cur_input.%s", afl->tmp_dir, afl->file_extension); } else { snprintf(tmpfile, PATH_MAX, "%s/.cur_input", afl->tmp_dir); } /* there is still a race condition here, but well ... */ if (access(tmpfile, F_OK) != -1) { FATAL( "AFL_TMPDIR already has an existing temporary input file: %s - if " "this is not from another instance, then just remove the file.", tmpfile); } } else { afl->tmp_dir = afl->out_dir; } /* If we don't have a file name chosen yet, use a safe default. */ if (!afl->fsrv.out_file) { u32 j = optind + 1; while (argv[j]) { u8 *aa_loc = strstr(argv[j], "@@"); if (aa_loc && !afl->fsrv.out_file) { afl->fsrv.use_stdin = 0; default_output = 0; if (afl->file_extension) { afl->fsrv.out_file = alloc_printf("%s/.cur_input.%s", afl->tmp_dir, afl->file_extension); } else { afl->fsrv.out_file = alloc_printf("%s/.cur_input", afl->tmp_dir); } detect_file_args(argv + optind + 1, afl->fsrv.out_file, &afl->fsrv.use_stdin); break; } ++j; } } if (!afl->fsrv.out_file) { setup_stdio_file(afl); } if (afl->cmplog_binary) { if (afl->unicorn_mode) { FATAL("CmpLog and Unicorn mode are not compatible at the moment, sorry"); } if (!afl->fsrv.qemu_mode && !afl->fsrv.frida_mode && !afl->fsrv.cs_mode && !afl->non_instrumented_mode) { check_binary(afl, afl->cmplog_binary); } } check_binary(afl, argv[optind]); #ifdef AFL_PERSISTENT_RECORD if (unlikely(afl->fsrv.persistent_record)) { if (!getenv(PERSIST_ENV_VAR)) { FATAL( "Target binary is not compiled in persistent mode, " "AFL_PERSISTENT_RECORD makes no sense."); } afl->fsrv.persistent_record_dir = alloc_printf("%s/crashes", afl->out_dir); } #endif if (afl->shmem_testcase_mode) { setup_testcase_shmem(afl); } afl->start_time = get_cur_time(); if (afl->fsrv.qemu_mode) { if (afl->use_wine) { use_argv = get_wine_argv(argv[0], &afl->fsrv.target_path, argc - optind, argv + optind); } else { use_argv = get_qemu_argv(argv[0], &afl->fsrv.target_path, argc - optind, argv + optind); } } else if (afl->fsrv.cs_mode) { use_argv = get_cs_argv(argv[0], &afl->fsrv.target_path, argc - optind, argv + optind); } else { use_argv = argv + optind; } if (afl->non_instrumented_mode || afl->fsrv.qemu_mode || afl->fsrv.frida_mode || afl->fsrv.cs_mode || afl->unicorn_mode) { u32 old_map_size = map_size; map_size = afl->fsrv.real_map_size = afl->fsrv.map_size = MAP_SIZE; afl->virgin_bits = ck_realloc(afl->virgin_bits, map_size); afl->virgin_tmout = ck_realloc(afl->virgin_tmout, map_size); afl->virgin_crash = ck_realloc(afl->virgin_crash, map_size); afl->var_bytes = ck_realloc(afl->var_bytes, map_size); afl->top_rated = ck_realloc(afl->top_rated, map_size * sizeof(void *)); afl->clean_trace = ck_realloc(afl->clean_trace, map_size); afl->clean_trace_custom = ck_realloc(afl->clean_trace_custom, map_size); afl->first_trace = ck_realloc(afl->first_trace, map_size); afl->map_tmp_buf = ck_realloc(afl->map_tmp_buf, map_size); if (old_map_size < map_size) { memset(afl->var_bytes + old_map_size, 0, map_size - old_map_size); memset(afl->top_rated + old_map_size, 0, map_size - old_map_size); memset(afl->clean_trace + old_map_size, 0, map_size - old_map_size); memset(afl->clean_trace_custom + old_map_size, 0, map_size - old_map_size); memset(afl->first_trace + old_map_size, 0, map_size - old_map_size); memset(afl->map_tmp_buf + old_map_size, 0, map_size - old_map_size); } } afl->argv = use_argv; afl->fsrv.trace_bits = afl_shm_init(&afl->shm, afl->fsrv.map_size, afl->non_instrumented_mode); if (!afl->non_instrumented_mode && !afl->fsrv.qemu_mode && !afl->unicorn_mode && !afl->fsrv.frida_mode && !afl->fsrv.cs_mode && !afl->afl_env.afl_skip_bin_check) { if (map_size <= DEFAULT_SHMEM_SIZE) { afl->fsrv.map_size = DEFAULT_SHMEM_SIZE; // dummy temporary value char vbuf[16]; snprintf(vbuf, sizeof(vbuf), "%u", DEFAULT_SHMEM_SIZE); setenv("AFL_MAP_SIZE", vbuf, 1); } u32 new_map_size = afl_fsrv_get_mapsize( &afl->fsrv, afl->argv, &afl->stop_soon, afl->afl_env.afl_debug_child); // only reinitialize if the map needs to be larger than what we have. if (map_size < new_map_size) { OKF("Re-initializing maps to %u bytes", new_map_size); u32 old_map_size = map_size; afl->virgin_bits = ck_realloc(afl->virgin_bits, new_map_size); afl->virgin_tmout = ck_realloc(afl->virgin_tmout, new_map_size); afl->virgin_crash = ck_realloc(afl->virgin_crash, new_map_size); afl->var_bytes = ck_realloc(afl->var_bytes, new_map_size); afl->top_rated = ck_realloc(afl->top_rated, new_map_size * sizeof(void *)); afl->clean_trace = ck_realloc(afl->clean_trace, new_map_size); afl->clean_trace_custom = ck_realloc(afl->clean_trace_custom, new_map_size); afl->first_trace = ck_realloc(afl->first_trace, new_map_size); afl->map_tmp_buf = ck_realloc(afl->map_tmp_buf, new_map_size); if (old_map_size < new_map_size) { memset(afl->var_bytes + old_map_size, 0, new_map_size - old_map_size); memset(afl->top_rated + old_map_size, 0, new_map_size - old_map_size); memset(afl->clean_trace + old_map_size, 0, new_map_size - old_map_size); memset(afl->clean_trace_custom + old_map_size, 0, new_map_size - old_map_size); memset(afl->first_trace + old_map_size, 0, new_map_size - old_map_size); memset(afl->map_tmp_buf + old_map_size, 0, new_map_size - old_map_size); } afl_fsrv_kill(&afl->fsrv); afl_shm_deinit(&afl->shm); afl->fsrv.map_size = new_map_size; afl->fsrv.trace_bits = afl_shm_init(&afl->shm, new_map_size, afl->non_instrumented_mode); setenv("AFL_NO_AUTODICT", "1", 1); // loaded already afl_fsrv_start(&afl->fsrv, afl->argv, &afl->stop_soon, afl->afl_env.afl_debug_child); map_size = new_map_size; } } if (afl->cmplog_binary) { ACTF("Spawning cmplog forkserver"); afl_fsrv_init_dup(&afl->cmplog_fsrv, &afl->fsrv); // TODO: this is semi-nice afl->cmplog_fsrv.trace_bits = afl->fsrv.trace_bits; afl->cmplog_fsrv.cs_mode = afl->fsrv.cs_mode; afl->cmplog_fsrv.qemu_mode = afl->fsrv.qemu_mode; afl->cmplog_fsrv.frida_mode = afl->fsrv.frida_mode; afl->cmplog_fsrv.cmplog_binary = afl->cmplog_binary; afl->cmplog_fsrv.target_path = afl->fsrv.target_path; afl->cmplog_fsrv.init_child_func = cmplog_exec_child; if ((map_size <= DEFAULT_SHMEM_SIZE || afl->cmplog_fsrv.map_size < map_size) && !afl->non_instrumented_mode && !afl->fsrv.qemu_mode && !afl->fsrv.frida_mode && !afl->unicorn_mode && !afl->fsrv.cs_mode && !afl->afl_env.afl_skip_bin_check) { afl->cmplog_fsrv.map_size = MAX(map_size, (u32)DEFAULT_SHMEM_SIZE); char vbuf[16]; snprintf(vbuf, sizeof(vbuf), "%u", afl->cmplog_fsrv.map_size); setenv("AFL_MAP_SIZE", vbuf, 1); } u32 new_map_size = afl_fsrv_get_mapsize(&afl->cmplog_fsrv, afl->argv, &afl->stop_soon, afl->afl_env.afl_debug_child); // only reinitialize when it needs to be larger if (map_size < new_map_size) { OKF("Re-initializing maps to %u bytes due cmplog", new_map_size); u32 old_map_size = map_size; afl->virgin_bits = ck_realloc(afl->virgin_bits, new_map_size); afl->virgin_tmout = ck_realloc(afl->virgin_tmout, new_map_size); afl->virgin_crash = ck_realloc(afl->virgin_crash, new_map_size); afl->var_bytes = ck_realloc(afl->var_bytes, new_map_size); afl->top_rated = ck_realloc(afl->top_rated, new_map_size * sizeof(void *)); afl->clean_trace = ck_realloc(afl->clean_trace, new_map_size); afl->clean_trace_custom = ck_realloc(afl->clean_trace_custom, new_map_size); afl->first_trace = ck_realloc(afl->first_trace, new_map_size); afl->map_tmp_buf = ck_realloc(afl->map_tmp_buf, new_map_size); if (old_map_size < new_map_size) { memset(afl->var_bytes + old_map_size, 0, new_map_size - old_map_size); memset(afl->top_rated + old_map_size, 0, new_map_size - old_map_size); memset(afl->clean_trace + old_map_size, 0, new_map_size - old_map_size); memset(afl->clean_trace_custom + old_map_size, 0, new_map_size - old_map_size); memset(afl->first_trace + old_map_size, 0, new_map_size - old_map_size); memset(afl->map_tmp_buf + old_map_size, 0, new_map_size - old_map_size); } afl_fsrv_kill(&afl->fsrv); afl_fsrv_kill(&afl->cmplog_fsrv); afl_shm_deinit(&afl->shm); afl->cmplog_fsrv.map_size = new_map_size; // non-cmplog stays the same map_size = new_map_size; setenv("AFL_NO_AUTODICT", "1", 1); // loaded already afl->fsrv.trace_bits = afl_shm_init(&afl->shm, new_map_size, afl->non_instrumented_mode); afl->cmplog_fsrv.trace_bits = afl->fsrv.trace_bits; afl_fsrv_start(&afl->fsrv, afl->argv, &afl->stop_soon, afl->afl_env.afl_debug_child); afl_fsrv_start(&afl->cmplog_fsrv, afl->argv, &afl->stop_soon, afl->afl_env.afl_debug_child); } OKF("Cmplog forkserver successfully started"); } load_auto(afl); if (extras_dir_cnt) { for (u8 i = 0; i < extras_dir_cnt; i++) { load_extras(afl, extras_dir[i]); } } if (afl->fsrv.out_file && afl->fsrv.use_shmem_fuzz) { unlink(afl->fsrv.out_file); afl->fsrv.out_file = NULL; afl->fsrv.use_stdin = 0; close(afl->fsrv.out_fd); afl->fsrv.out_fd = -1; if (!afl->unicorn_mode && !afl->fsrv.use_stdin && !default_output) { WARNF( "You specified -f or @@ on the command line but the target harness " "specified fuzz cases via shmem, switching to shmem!"); } } deunicode_extras(afl); dedup_extras(afl); if (afl->extras_cnt) { OKF("Loaded a total of %u extras.", afl->extras_cnt); } // after we have the correct bitmap size we can read the bitmap -B option // and set the virgin maps if (afl->in_bitmap) { read_bitmap(afl->in_bitmap, afl->virgin_bits, afl->fsrv.map_size); } else { memset(afl->virgin_bits, 255, map_size); } memset(afl->virgin_tmout, 255, map_size); memset(afl->virgin_crash, 255, map_size); if (likely(!afl->afl_env.afl_no_startup_calibration)) { perform_dry_run(afl); } else { ACTF("skipping initial seed calibration due option override!"); usleep(1000); } if (afl->q_testcase_max_cache_entries) { afl->q_testcase_cache = ck_alloc(afl->q_testcase_max_cache_entries * sizeof(size_t)); if (!afl->q_testcase_cache) { PFATAL("malloc failed for cache entries"); } } cull_queue(afl); // ensure we have at least one seed that is not disabled. u32 entry, valid_seeds = 0; for (entry = 0; entry < afl->queued_items; ++entry) if (!afl->queue_buf[entry]->disabled) { ++valid_seeds; } if (!afl->pending_not_fuzzed || !valid_seeds) { FATAL("We need at least one valid input seed that does not crash!"); } if (afl->timeout_given == 2) { // -t ...+ option if (valid_seeds == 1) { WARNF( "Only one valid seed is present, auto-calculating the timeout is " "disabled!"); afl->timeout_given = 1; } else { u64 max_ms = 0; for (entry = 0; entry < afl->queued_items; ++entry) if (!afl->queue_buf[entry]->disabled) if (afl->queue_buf[entry]->exec_us > max_ms) max_ms = afl->queue_buf[entry]->exec_us; afl->fsrv.exec_tmout = max_ms; afl->timeout_given = 1; } } show_init_stats(afl); if (unlikely(afl->old_seed_selection)) seek_to = find_start_position(afl); afl->start_time = get_cur_time(); if (afl->in_place_resume || afl->afl_env.afl_autoresume) { load_stats_file(afl); } if (!afl->non_instrumented_mode) { write_stats_file(afl, 0, 0, 0, 0); } maybe_update_plot_file(afl, 0, 0, 0); save_auto(afl); if (afl->stop_soon) { goto stop_fuzzing; } /* Woop woop woop */ if (!afl->not_on_tty) { sleep(1); if (afl->stop_soon) { goto stop_fuzzing; } } // (void)nice(-20); // does not improve the speed // real start time, we reset, so this works correctly with -V afl->start_time = get_cur_time(); #ifdef INTROSPECTION u32 prev_saved_crashes = 0, prev_saved_tmouts = 0; #endif u32 prev_queued_items = 0, runs_in_current_cycle = (u32)-1; u8 skipped_fuzz; #ifdef INTROSPECTION char ifn[4096]; snprintf(ifn, sizeof(ifn), "%s/introspection.txt", afl->out_dir); if ((afl->introspection_file = fopen(ifn, "w")) == NULL) { PFATAL("could not create '%s'", ifn); } setvbuf(afl->introspection_file, NULL, _IONBF, 0); OKF("Writing mutation introspection to '%s'", ifn); #endif while (likely(!afl->stop_soon)) { cull_queue(afl); if (unlikely((!afl->old_seed_selection && runs_in_current_cycle > afl->queued_items) || (afl->old_seed_selection && !afl->queue_cur))) { if (unlikely((afl->last_sync_cycle < afl->queue_cycle || (!afl->queue_cycle && afl->afl_env.afl_import_first)) && afl->sync_id)) { if (!afl->queue_cycle && afl->afl_env.afl_import_first) { OKF("Syncing queues from other fuzzer instances first ..."); } sync_fuzzers(afl); } ++afl->queue_cycle; runs_in_current_cycle = (u32)-1; afl->cur_skipped_items = 0; // 1st april fool joke - enable pizza mode // to not waste time on checking the date we only do this when the // queue is fully cycled. time_t cursec = time(NULL); struct tm *curdate = localtime(&cursec); if (likely(!afl->afl_env.afl_pizza_mode)) { if (unlikely(curdate->tm_mon == 3 && curdate->tm_mday == 1)) { afl->pizza_is_served = 1; } else { afl->pizza_is_served = 0; } } if (unlikely(afl->old_seed_selection)) { afl->current_entry = 0; while (unlikely(afl->current_entry < afl->queued_items && afl->queue_buf[afl->current_entry]->disabled)) { ++afl->current_entry; } if (afl->current_entry >= afl->queued_items) { afl->current_entry = 0; } afl->queue_cur = afl->queue_buf[afl->current_entry]; if (unlikely(seek_to)) { if (unlikely(seek_to >= afl->queued_items)) { // This should never happen. FATAL("BUG: seek_to location out of bounds!\n"); } afl->current_entry = seek_to; afl->queue_cur = afl->queue_buf[seek_to]; seek_to = 0; } } if (unlikely(afl->not_on_tty)) { ACTF("Entering queue cycle %llu.", afl->queue_cycle); fflush(stdout); } /* If we had a full queue cycle with no new finds, try recombination strategies next. */ if (unlikely(afl->queued_items == prev_queued /* FIXME TODO BUG: && (get_cur_time() - afl->start_time) >= 3600 */ )) { if (afl->use_splicing) { ++afl->cycles_wo_finds; if (unlikely(afl->shm.cmplog_mode && afl->cmplog_max_filesize < MAX_FILE)) { afl->cmplog_max_filesize <<= 4; } switch (afl->expand_havoc) { case 0: // this adds extra splicing mutation options to havoc mode afl->expand_havoc = 1; break; case 1: // add MOpt mutator /* if (afl->limit_time_sig == 0 && !afl->custom_only && !afl->python_only) { afl->limit_time_sig = -1; afl->limit_time_puppet = 0; } */ afl->expand_havoc = 2; if (afl->cmplog_lvl && afl->cmplog_lvl < 2) afl->cmplog_lvl = 2; break; case 2: // increase havoc mutations per fuzz attempt afl->havoc_stack_pow2++; afl->expand_havoc = 3; break; case 3: // further increase havoc mutations per fuzz attempt afl->havoc_stack_pow2++; afl->expand_havoc = 4; break; case 4: afl->expand_havoc = 5; // if (afl->cmplog_lvl && afl->cmplog_lvl < 3) afl->cmplog_lvl = // 3; break; case 5: // nothing else currently break; } } else { #ifndef NO_SPLICING afl->use_splicing = 1; #else afl->use_splicing = 0; #endif } } else { afl->cycles_wo_finds = 0; } #ifdef INTROSPECTION { u64 cur_time = get_cur_time(); fprintf(afl->introspection_file, "CYCLE cycle=%llu cycle_wo_finds=%llu time_wo_finds=%llu " "expand_havoc=%u queue=%u\n", afl->queue_cycle, afl->cycles_wo_finds, afl->longest_find_time > cur_time - afl->last_find_time ? afl->longest_find_time / 1000 : ((afl->start_time == 0 || afl->last_find_time == 0) ? 0 : (cur_time - afl->last_find_time) / 1000), afl->expand_havoc, afl->queued_items); } #endif if (afl->cycle_schedules) { /* we cannot mix non-AFLfast schedules with others */ switch (afl->schedule) { case EXPLORE: afl->schedule = EXPLOIT; break; case EXPLOIT: afl->schedule = MMOPT; break; case MMOPT: afl->schedule = SEEK; break; case SEEK: afl->schedule = EXPLORE; break; case FAST: afl->schedule = COE; break; case COE: afl->schedule = LIN; break; case LIN: afl->schedule = QUAD; break; case QUAD: afl->schedule = RARE; break; case RARE: afl->schedule = FAST; break; } // we must recalculate the scores of all queue entries for (u32 i = 0; i < afl->queued_items; i++) { if (likely(!afl->queue_buf[i]->disabled)) { update_bitmap_score(afl, afl->queue_buf[i]); } } } prev_queued = afl->queued_items; } ++runs_in_current_cycle; do { if (likely(!afl->old_seed_selection)) { if (likely(afl->pending_favored && afl->smallest_favored >= 0)) { afl->current_entry = afl->smallest_favored; /* } else { for (s32 iter = afl->queued_items - 1; iter >= 0; --iter) { if (unlikely(afl->queue_buf[iter]->favored && !afl->queue_buf[iter]->was_fuzzed)) { afl->current_entry = iter; break; } } */ afl->queue_cur = afl->queue_buf[afl->current_entry]; } else { if (unlikely(prev_queued_items < afl->queued_items || afl->reinit_table)) { // we have new queue entries since the last run, recreate alias // table prev_queued_items = afl->queued_items; create_alias_table(afl); } do { afl->current_entry = select_next_queue_entry(afl); } while (unlikely(afl->current_entry >= afl->queued_items)); afl->queue_cur = afl->queue_buf[afl->current_entry]; } } skipped_fuzz = fuzz_one(afl); #ifdef INTROSPECTION ++afl->queue_cur->stats_selected; if (unlikely(skipped_fuzz)) { ++afl->queue_cur->stats_skipped; } else { if (unlikely(afl->queued_items > prev_queued_items)) { afl->queue_cur->stats_finds += afl->queued_items - prev_queued_items; prev_queued_items = afl->queued_items; } if (unlikely(afl->saved_crashes > prev_saved_crashes)) { afl->queue_cur->stats_crashes += afl->saved_crashes - prev_saved_crashes; prev_saved_crashes = afl->saved_crashes; } if (unlikely(afl->saved_tmouts > prev_saved_tmouts)) { afl->queue_cur->stats_tmouts += afl->saved_tmouts - prev_saved_tmouts; prev_saved_tmouts = afl->saved_tmouts; } } #endif if (unlikely(!afl->stop_soon && exit_1)) { afl->stop_soon = 2; } if (unlikely(afl->old_seed_selection)) { while (++afl->current_entry < afl->queued_items && afl->queue_buf[afl->current_entry]->disabled) {}; if (unlikely(afl->current_entry >= afl->queued_items || afl->queue_buf[afl->current_entry] == NULL || afl->queue_buf[afl->current_entry]->disabled)) { afl->queue_cur = NULL; } else { afl->queue_cur = afl->queue_buf[afl->current_entry]; } } } while (skipped_fuzz && afl->queue_cur && !afl->stop_soon); u64 cur_time = get_cur_time(); if (likely(afl->switch_fuzz_mode && afl->fuzz_mode == 0 && !afl->non_instrumented_mode) && unlikely(cur_time > (likely(afl->last_find_time) ? afl->last_find_time : afl->start_time) + afl->switch_fuzz_mode)) { if (afl->afl_env.afl_no_ui) { ACTF( "No new coverage found for %llu seconds, switching to exploitation " "strategy.", afl->switch_fuzz_mode / 1000); } afl->fuzz_mode = 1; } if (likely(!afl->stop_soon && afl->sync_id)) { if (likely(afl->skip_deterministic)) { if (unlikely(afl->is_main_node)) { if (unlikely(cur_time > (afl->sync_time >> 1) + afl->last_sync_time)) { if (!(sync_interval_cnt++ % (SYNC_INTERVAL / 3))) { sync_fuzzers(afl); } } } else { if (unlikely(cur_time > afl->sync_time + afl->last_sync_time)) { if (!(sync_interval_cnt++ % SYNC_INTERVAL)) { sync_fuzzers(afl); } } } } else { sync_fuzzers(afl); } } } stop_fuzzing: afl->force_ui_update = 1; // ensure the screen is reprinted afl->stop_soon = 1; // ensure everything is written show_stats(afl); // print the screen one last time write_bitmap(afl); save_auto(afl); if (afl->pizza_is_served) { SAYF(CURSOR_SHOW cLRD "\n\n+++ Baking aborted %s +++\n" cRST, afl->stop_soon == 2 ? "programmatically" : "by the chef"); } else { SAYF(CURSOR_SHOW cLRD "\n\n+++ Testing aborted %s +++\n" cRST, afl->stop_soon == 2 ? "programmatically" : "by user"); } if (afl->most_time_key == 2) { SAYF(cYEL "[!] " cRST "Time limit was reached\n"); } if (afl->most_execs_key == 2) { SAYF(cYEL "[!] " cRST "Execution limit was reached\n"); } /* Running for more than 30 minutes but still doing first cycle? */ if (afl->queue_cycle == 1 && get_cur_time() - afl->start_time > 30 * 60 * 1000) { SAYF("\n" cYEL "[!] " cRST "Stopped during the first cycle, results may be incomplete.\n" " (For info on resuming, see %s/README.md)\n", doc_path); } if (afl->not_on_tty) { u32 t_bytes = count_non_255_bytes(afl, afl->virgin_bits); u8 time_tmp[64]; u_stringify_time_diff(time_tmp, get_cur_time(), afl->start_time); ACTF( "Statistics: %u new corpus items found, %.02f%% coverage achieved, " "%llu crashes saved, %llu timeouts saved, total runtime %s", afl->queued_discovered, ((double)t_bytes * 100) / afl->fsrv.real_map_size, afl->saved_crashes, afl->saved_hangs, time_tmp); } #ifdef PROFILING SAYF(cYEL "[!] " cRST "Profiling information: %llu ms total work, %llu ns/run\n", time_spent_working / 1000000, time_spent_working / afl->fsrv.total_execs); #endif if (afl->afl_env.afl_final_sync) { SAYF(cYEL "[!] " cRST "\nPerforming final sync, this make take some time ...\n"); sync_fuzzers(afl); write_bitmap(afl); SAYF(cYEL "[!] " cRST "Done!\n\n"); } if (afl->is_main_node) { u8 path[PATH_MAX]; sprintf(path, "%s/is_main_node", afl->out_dir); unlink(path); } if (frida_afl_preload) { ck_free(frida_afl_preload); } fclose(afl->fsrv.plot_file); #ifdef INTROSPECTION fclose(afl->fsrv.det_plot_file); #endif destroy_queue(afl); destroy_extras(afl); destroy_custom_mutators(afl); afl_shm_deinit(&afl->shm); if (afl->shm_fuzz) { afl_shm_deinit(afl->shm_fuzz); ck_free(afl->shm_fuzz); } afl_fsrv_deinit(&afl->fsrv); /* remove tmpfile */ if (afl->tmp_dir != NULL && !afl->in_place_resume && afl->fsrv.out_file) { (void)unlink(afl->fsrv.out_file); } if (afl->orig_cmdline) { ck_free(afl->orig_cmdline); } ck_free(afl->fsrv.target_path); ck_free(afl->fsrv.out_file); ck_free(afl->sync_id); if (afl->q_testcase_cache) { ck_free(afl->q_testcase_cache); } afl_state_deinit(afl); free(afl); /* not tracked */ argv_cpy_free(argv); alloc_report(); OKF("We're done here. Have a nice day!\n"); exit(0); } #endif /* !AFL_LIB */