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AFLplusplus/src/afl-fuzz-state.c
van Hauser bab60b68d9 changed the default schedule to coe
2020-10-04 20:45:59 +02:00

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/*
american fuzzy lop++ - globals declarations
-------------------------------------------
Originally written by Michal Zalewski
Now maintained by Marc Heuse <mh@mh-sec.de>,
Heiko Eißfeldt <heiko.eissfeldt@hexco.de> and
Andrea Fioraldi <andreafioraldi@gmail.com>
Copyright 2016, 2017 Google Inc. All rights reserved.
Copyright 2019-2020 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:
http://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 "envs.h"
s8 interesting_8[] = {INTERESTING_8};
s16 interesting_16[] = {INTERESTING_8, INTERESTING_16};
s32 interesting_32[] = {INTERESTING_8, INTERESTING_16, INTERESTING_32};
char *power_names[POWER_SCHEDULES_NUM] = {"explore", "mmopt", "exploit",
"fast", "coe", "lin",
"quad", "rare", "seek"};
/* Initialize MOpt "globals" for this afl state */
static void init_mopt_globals(afl_state_t *afl) {
MOpt_globals_t *core = &afl->mopt_globals_core;
core->finds = afl->core_operator_finds_puppet;
core->finds_v2 = afl->core_operator_finds_puppet_v2;
core->cycles = afl->core_operator_cycles_puppet;
core->cycles_v2 = afl->core_operator_cycles_puppet_v2;
core->cycles_v3 = afl->core_operator_cycles_puppet_v3;
core->is_pilot_mode = 0;
core->pTime = &afl->tmp_core_time;
core->period = period_core;
core->havoc_stagename = "MOpt-core-havoc";
core->splice_stageformat = "MOpt-core-splice %u";
core->havoc_stagenameshort = "MOpt_core_havoc";
core->splice_stagenameshort = "MOpt_core_splice";
MOpt_globals_t *pilot = &afl->mopt_globals_pilot;
pilot->finds = afl->stage_finds_puppet[0];
pilot->finds_v2 = afl->stage_finds_puppet_v2[0];
pilot->cycles = afl->stage_cycles_puppet[0];
pilot->cycles_v2 = afl->stage_cycles_puppet_v2[0];
pilot->cycles_v3 = afl->stage_cycles_puppet_v3[0];
pilot->is_pilot_mode = 1;
pilot->pTime = &afl->tmp_pilot_time;
pilot->period = period_pilot;
pilot->havoc_stagename = "MOpt-havoc";
pilot->splice_stageformat = "MOpt-splice %u";
pilot->havoc_stagenameshort = "MOpt_havoc";
pilot->splice_stagenameshort = "MOpt_splice";
}
/* A global pointer to all instances is needed (for now) for signals to arrive
*/
static list_t afl_states = {.element_prealloc_count = 0};
/* Initializes an afl_state_t. */
void afl_state_init(afl_state_t *afl, uint32_t map_size) {
/* thanks to this memset, growing vars like out_buf
and out_size are NULL/0 by default. */
memset(afl, 0, sizeof(afl_state_t));
afl->shm.map_size = map_size ? map_size : MAP_SIZE;
afl->w_init = 0.9;
afl->w_end = 0.3;
afl->g_max = 5000;
afl->period_pilot_tmp = 5000.0;
afl->schedule = COE; /* Power schedule (default: COE) */
afl->havoc_max_mult = HAVOC_MAX_MULT;
afl->clear_screen = 1; /* Window resized? */
afl->havoc_div = 1; /* Cycle count divisor for havoc */
afl->stage_name = "init"; /* Name of the current fuzz stage */
afl->splicing_with = -1; /* Splicing with which test case? */
afl->cpu_to_bind = -1;
afl->havoc_stack_pow2 = HAVOC_STACK_POW2;
afl->cal_cycles = CAL_CYCLES;
afl->cal_cycles_long = CAL_CYCLES_LONG;
afl->hang_tmout = EXEC_TIMEOUT;
afl->stats_update_freq = 1;
afl->stats_avg_exec = -1;
#ifdef HAVE_AFFINITY
afl->cpu_aff = -1; /* Selected CPU core */
#endif /* HAVE_AFFINITY */
afl->virgin_bits = ck_alloc(map_size);
afl->virgin_tmout = ck_alloc(map_size);
afl->virgin_crash = ck_alloc(map_size);
afl->var_bytes = ck_alloc(map_size);
afl->top_rated = ck_alloc(map_size * sizeof(void *));
afl->clean_trace = ck_alloc(map_size);
afl->clean_trace_custom = ck_alloc(map_size);
afl->first_trace = ck_alloc(map_size);
afl->map_tmp_buf = ck_alloc(map_size);
afl->fsrv.use_stdin = 1;
afl->fsrv.map_size = map_size;
// afl_state_t is not available in forkserver.c
afl->fsrv.afl_ptr = (void *)afl;
afl->fsrv.add_extra_func = (void (*)(void *, u8 *, u32)) & add_extra;
afl->fsrv.exec_tmout = EXEC_TIMEOUT;
afl->fsrv.mem_limit = MEM_LIMIT;
afl->fsrv.dev_urandom_fd = -1;
afl->fsrv.dev_null_fd = -1;
afl->fsrv.child_pid = -1;
afl->fsrv.out_dir_fd = -1;
init_mopt_globals(afl);
list_append(&afl_states, afl);
}
/*This sets up the environment variables for afl-fuzz into the afl_state
* struct*/
void read_afl_environment(afl_state_t *afl, char **envp) {
int index = 0, issue_detected = 0;
char *env;
while ((env = envp[index++]) != NULL) {
if (strncmp(env, "ALF_", 4) == 0) {
WARNF("Potentially mistyped AFL environment variable: %s", env);
issue_detected = 1;
} else if (strncmp(env, "USE_", 4) == 0) {
WARNF(
"Potentially mistyped AFL environment variable: %s, did you mean "
"AFL_%s?",
env, env);
issue_detected = 1;
} else if (strncmp(env, "AFL_", 4) == 0) {
int i = 0, match = 0;
while (match == 0 && afl_environment_variables[i] != NULL) {
size_t afl_environment_variable_len =
strlen(afl_environment_variables[i]);
if (strncmp(env, afl_environment_variables[i],
afl_environment_variable_len) == 0 &&
env[afl_environment_variable_len] == '=') {
match = 1;
if (!strncmp(env, "AFL_SKIP_CPUFREQ", afl_environment_variable_len)) {
afl->afl_env.afl_skip_cpufreq =
get_afl_env(afl_environment_variables[i]) ? 1 : 0;
} else if (!strncmp(env, "AFL_EXIT_WHEN_DONE",
afl_environment_variable_len)) {
afl->afl_env.afl_exit_when_done =
get_afl_env(afl_environment_variables[i]) ? 1 : 0;
} else if (!strncmp(env, "AFL_NO_AFFINITY",
afl_environment_variable_len)) {
afl->afl_env.afl_no_affinity =
get_afl_env(afl_environment_variables[i]) ? 1 : 0;
} else if (!strncmp(env, "AFL_SKIP_CRASHES",
afl_environment_variable_len)) {
afl->afl_env.afl_skip_crashes =
(u8 *)get_afl_env(afl_environment_variables[i]);
} else if (!strncmp(env, "AFL_HANG_TMOUT",
afl_environment_variable_len)) {
afl->afl_env.afl_hang_tmout =
(u8 *)get_afl_env(afl_environment_variables[i]);
} else if (!strncmp(env, "AFL_SKIP_BIN_CHECK",
afl_environment_variable_len)) {
afl->afl_env.afl_skip_bin_check =
get_afl_env(afl_environment_variables[i]) ? 1 : 0;
} else if (!strncmp(env, "AFL_DUMB_FORKSRV",
afl_environment_variable_len)) {
afl->afl_env.afl_dumb_forksrv =
get_afl_env(afl_environment_variables[i]) ? 1 : 0;
} else if (!strncmp(env, "AFL_IMPORT_FIRST",
afl_environment_variable_len)) {
afl->afl_env.afl_import_first =
get_afl_env(afl_environment_variables[i]) ? 1 : 0;
} else if (!strncmp(env, "AFL_CUSTOM_MUTATOR_ONLY",
afl_environment_variable_len)) {
afl->afl_env.afl_custom_mutator_only =
get_afl_env(afl_environment_variables[i]) ? 1 : 0;
} else if (!strncmp(env, "AFL_NO_UI", afl_environment_variable_len)) {
afl->afl_env.afl_no_ui =
get_afl_env(afl_environment_variables[i]) ? 1 : 0;
} else if (!strncmp(env, "AFL_FORCE_UI",
afl_environment_variable_len)) {
afl->afl_env.afl_force_ui =
get_afl_env(afl_environment_variables[i]) ? 1 : 0;
} else if (!strncmp(env, "AFL_I_DONT_CARE_ABOUT_MISSING_CRASHES",
afl_environment_variable_len)) {
afl->afl_env.afl_i_dont_care_about_missing_crashes =
get_afl_env(afl_environment_variables[i]) ? 1 : 0;
} else if (!strncmp(env, "AFL_BENCH_JUST_ONE",
afl_environment_variable_len)) {
afl->afl_env.afl_bench_just_one =
get_afl_env(afl_environment_variables[i]) ? 1 : 0;
} else if (!strncmp(env, "AFL_BENCH_UNTIL_CRASH",
afl_environment_variable_len)) {
afl->afl_env.afl_bench_until_crash =
get_afl_env(afl_environment_variables[i]) ? 1 : 0;
} else if (!strncmp(env, "AFL_DEBUG_CHILD_OUTPUT",
afl_environment_variable_len)) {
afl->afl_env.afl_debug_child_output =
get_afl_env(afl_environment_variables[i]) ? 1 : 0;
} else if (!strncmp(env, "AFL_AUTORESUME",
afl_environment_variable_len)) {
afl->afl_env.afl_autoresume =
get_afl_env(afl_environment_variables[i]) ? 1 : 0;
} else if (!strncmp(env, "AFL_CYCLE_SCHEDULES",
afl_environment_variable_len)) {
afl->cycle_schedules = afl->afl_env.afl_cycle_schedules =
get_afl_env(afl_environment_variables[i]) ? 1 : 0;
} else if (!strncmp(env, "AFL_EXPAND_HAVOC_NOW",
afl_environment_variable_len)) {
afl->expand_havoc = afl->afl_env.afl_expand_havoc =
get_afl_env(afl_environment_variables[i]) ? 1 : 0;
} else if (!strncmp(env, "AFL_CAL_FAST",
afl_environment_variable_len)) {
afl->afl_env.afl_cal_fast =
get_afl_env(afl_environment_variables[i]) ? 1 : 0;
} else if (!strncmp(env, "AFL_TMPDIR",
afl_environment_variable_len)) {
afl->afl_env.afl_tmpdir =
(u8 *)get_afl_env(afl_environment_variables[i]);
} else if (!strncmp(env, "AFL_CUSTOM_MUTATOR_LIBRARY",
afl_environment_variable_len)) {
afl->afl_env.afl_custom_mutator_library =
(u8 *)get_afl_env(afl_environment_variables[i]);
} else if (!strncmp(env, "AFL_PYTHON_MODULE",
afl_environment_variable_len)) {
afl->afl_env.afl_python_module =
(u8 *)get_afl_env(afl_environment_variables[i]);
} else if (!strncmp(env, "AFL_PATH", afl_environment_variable_len)) {
afl->afl_env.afl_path =
(u8 *)get_afl_env(afl_environment_variables[i]);
} else if (!strncmp(env, "AFL_PRELOAD",
afl_environment_variable_len)) {
afl->afl_env.afl_preload =
(u8 *)get_afl_env(afl_environment_variables[i]);
} else if (!strncmp(env, "AFL_MAX_DET_EXTRAS",
afl_environment_variable_len)) {
afl->afl_env.afl_max_det_extras =
(u8 *)get_afl_env(afl_environment_variables[i]);
} else if (!strncmp(env, "AFL_FORKSRV_INIT_TMOUT",
afl_environment_variable_len)) {
afl->afl_env.afl_forksrv_init_tmout =
(u8 *)get_afl_env(afl_environment_variables[i]);
}
} else {
i++;
}
}
i = 0;
while (match == 0 && afl_environment_variables[i] != NULL) {
if (strncmp(env, afl_environment_variables[i],
strlen(afl_environment_variables[i])) == 0 &&
env[strlen(afl_environment_variables[i])] == '=') {
match = 1;
} else {
i++;
}
}
i = 0;
while (match == 0 && afl_environment_deprecated[i] != NULL) {
if (strncmp(env, afl_environment_deprecated[i],
strlen(afl_environment_deprecated[i])) == 0 &&
env[strlen(afl_environment_deprecated[i])] == '=') {
match = 1;
WARNF("AFL environment variable %s is deprecated!",
afl_environment_deprecated[i]);
issue_detected = 1;
} else {
i++;
}
}
if (match == 0) {
WARNF("Mistyped AFL environment variable: %s", env);
issue_detected = 1;
}
}
}
if (issue_detected) { sleep(2); }
}
/* Removes this afl_state instance and frees it. */
void afl_state_deinit(afl_state_t *afl) {
if (afl->in_place_resume) { ck_free(afl->in_dir); }
if (afl->sync_id) { ck_free(afl->out_dir); }
if (afl->pass_stats) { ck_free(afl->pass_stats); }
if (afl->orig_cmp_map) { ck_free(afl->orig_cmp_map); }
afl_free(afl->queue_buf);
afl_free(afl->out_buf);
afl_free(afl->out_scratch_buf);
afl_free(afl->eff_buf);
afl_free(afl->in_buf);
afl_free(afl->in_scratch_buf);
afl_free(afl->ex_buf);
ck_free(afl->virgin_bits);
ck_free(afl->virgin_tmout);
ck_free(afl->virgin_crash);
ck_free(afl->var_bytes);
ck_free(afl->top_rated);
ck_free(afl->clean_trace);
ck_free(afl->clean_trace_custom);
ck_free(afl->first_trace);
ck_free(afl->map_tmp_buf);
list_remove(&afl_states, afl);
}
void afl_states_stop(void) {
/* We may be inside a signal handler.
Set flags first, send kill signals to child proceses later. */
LIST_FOREACH(&afl_states, afl_state_t, {
el->stop_soon = 1;
});
LIST_FOREACH(&afl_states, afl_state_t, {
if (el->fsrv.child_pid > 0) kill(el->fsrv.child_pid, SIGKILL);
if (el->fsrv.fsrv_pid > 0) kill(el->fsrv.fsrv_pid, SIGKILL);
});
}
void afl_states_clear_screen(void) {
LIST_FOREACH(&afl_states, afl_state_t, { el->clear_screen = 1; });
}
void afl_states_request_skip(void) {
LIST_FOREACH(&afl_states, afl_state_t, { el->skip_requested = 1; });
}
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