/*
american fuzzy lop++ - file format analyzer
-------------------------------------------
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 2019-2024 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
A nifty utility that grabs an input file and takes a stab at explaining
its structure by observing how changes to it affect the execution path.
If the output scrolls past the edge of the screen, pipe it to 'less -r'.
*/
#define AFL_MAIN
#include "config.h"
#include "types.h"
#include "debug.h"
#include "alloc-inl.h"
#include "hash.h"
#include "sharedmem.h"
#include "common.h"
#include "forkserver.h"
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <errno.h>
#include <signal.h>
#include <dirent.h>
#include <fcntl.h>
#include <ctype.h>
#include <sys/wait.h>
#include <sys/time.h>
#ifndef USEMMAP
#include <sys/shm.h>
#endif
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/resource.h>
static u8 *in_file; /* Analyzer input test case */
static u8 *in_data; /* Input data for analysis */
static u32 in_len, /* Input data length */
total_execs, /* Total number of execs */
exec_hangs, /* Total number of hangs */
exec_tmout = EXEC_TIMEOUT; /* Exec timeout (ms) */
static u64 orig_cksum; /* Original checksum */
static u64 mem_limit = MEM_LIMIT; /* Memory limit (MB) */
static bool edges_only, /* Ignore hit counts? */
use_hex_offsets, /* Show hex offsets? */
use_stdin = true; /* Use stdin for program input? */
static volatile u8 stop_soon; /* Ctrl-C pressed? */
static u8 *target_path;
static u8 frida_mode;
static u8 qemu_mode;
static u8 cs_mode;
static u32 map_size = MAP_SIZE;
static afl_forkserver_t fsrv = {0}; /* The forkserver */
/* Constants used for describing byte behavior. */
#define RESP_NONE 0x00 /* Changing byte is a no-op. */
#define RESP_MINOR 0x01 /* Some changes have no effect. */
#define RESP_VARIABLE 0x02 /* Changes produce variable paths. */
#define RESP_FIXED 0x03 /* Changes produce fixed patterns. */
#define RESP_LEN 0x04 /* Potential length field */
#define RESP_CKSUM 0x05 /* Potential checksum */
#define RESP_SUSPECT 0x06 /* Potential "suspect" blob */
/* Classify tuple counts. This is a slow & naive version, but good enough here.
*/
//��ģ�����ԵĴ��������й鲢���ڲ����̫��Ӱ�������¼������㡢��������
static u8 count_class_lookup[256] = {
[0] = 0,
[1] = 1,
[2] = 2,
[3] = 4,
[4 ... 7] = 8,
[8 ... 15] = 16,
[16 ... 31] = 32,
[32 ... 127] = 64,
[128 ... 255] = 128
};
//�����ӽ���
static void kill_child() {
if (fsrv.child_pid > 0) {
//kill������ɱ����Ӧpid���ӽ��̣��������־λ��Ϊ1
kill(fsrv.child_pid, fsrv.child_kill_signal);
//���ӽ��̵�pid��Ϊ-1������ѡ��
fsrv.child_pid = -1;
}
}
//���ڴ��е��ֽڽ��з��࣬ͨ��Ԥ����count_class_lookup����ʵ�ַ����Ч��
static void classify_counts(u8 *mem, u32 mem_size) {
u32 i = mem_size;
//���ֻ�Ա�Ե̽����Ҫ��ֻ������Ϊbool����
if (edges_only) {
while (i--) {
if (*mem) { *mem = 1; }
mem++;
}
} else {
while (i--) {
*mem = count_class_lookup[*mem];
mem++;
}
}
}
/* See if any bytes are set in the bitmap. */
//��������bitmap������Ƿ����ֽ���bitmap���汻������
static inline u8 anything_set(void) {
//ʹ��fsrv.trace_bitsģ��bitmap
u32 *ptr = (u32 *)fsrv.trace_bits;
//map_size�Ĵ�С����4����Ϊ�ǰ��ֽڽ�������
u32 i = (map_size >> 2);
while (i--) {
if (*(ptr++)) { return 1; }
}
return 0;
}
/* Get rid of temp files (atexit handler). */
//�ں�������ʱ���ã�ɾ����ʱ�ļ�
static void at_exit_handler(void) {
unlink(fsrv.out_file); /* Ignore errors */
}
/* Read initial file. */
//��ȡ��Ҫ�������ļ�����ʼ״̬
static void read_initial_file(void) {
struct stat st;
s32 fd = open(in_file, O_RDONLY);
//����ȡ��֧
if (fd < 0) { PFATAL("Unable to open '%s'", in_file); }
//��ȡ�����ļ�����Ϊ�շ�֧
if (fstat(fd, &st) || !st.st_size) { FATAL("Zero-sized input file."); }
//��ȡ�ļ����ݳ����������ֵ��֧
if (st.st_size >= TMIN_MAX_FILE) {
FATAL("Input file is too large (%ld MB max)", TMIN_MAX_FILE / 1024 / 1024);
}
in_len = st.st_size;
in_data = ck_alloc_nozero(in_len);
ck_read(fd, in_data, in_len, in_file);
close(fd);
OKF("Read %u byte%s from '%s'.", in_len, in_len == 1 ? "" : "s", in_file);
}
/* Execute target application. Returns exec checksum, or 0 if program
times out. */
//��һ��Ŀ�����ľ�����̣������ڲ�Ӱ���������ʹ�õ�ǰ���¶Գ������ģ������
static u64 analyze_run_target(u8 *mem, u32 len, u8 first_run) {
//���ó���ľ����ַд�뵽����ջ��
afl_fsrv_write_to_testcase(&fsrv, mem, len);
//ʹ��afl_fsrv_run_target�����������о�����̣�����������ص�fsrv_run_result_t������
fsrv_run_result_t ret = afl_fsrv_run_target(&fsrv, exec_tmout, &stop_soon);
//��������ʧ�ܷ�֧
if (ret == FSRV_RUN_ERROR) {
FATAL("Error in forkserver");
}
//���о���ȱʧ��֧
else if (ret == FSRV_RUN_NOINST) {
FATAL("Target not instrumented");
}
//���б�����֧
else if (ret == FSRV_RUN_NOBITS) {
FATAL("Failed to run target");
}
//����classify_counts�������Բ��Խ����ڴ��е��ֽڽ��з��࣬������һ��ģ������
classify_counts(fsrv.trace_bits, fsrv.map_size);
//ȫ�ֱ�����total_execs�������Բ��Գ��������м�¼
total_execs++;
if (stop_soon) {
//�û������˳���Ctrl+C�������˳�ʾ��
SAYF(cRST cLRD "\n+++ Analysis aborted by user +++\n" cRST);
exit(1);
}
/* Always discard inputs that time out. */
//�������г�ʱ��ȫ�ֱ�����exec_hangs�������Բ��Գ���ʱ�����м�¼
if (fsrv.last_run_timed_out) {
exec_hangs++;
return 0;
}
//���
u64 cksum = hash64(fsrv.trace_bits, fsrv.map_size, HASH_CONST);
if (ret == FSRV_RUN_CRASH) {
/* We don't actually care if the target is crashing or not,
except that when it does, the checksum should be different. */
//У���ȫ1���ÿλȡ��
cksum ^= 0xffffffff;
}
//��¼��ʼУ���
if (first_run) { orig_cksum = cksum; }
return cksum;
}
#ifdef USE_COLOR
/* Helper function to display a human-readable character. */
//���ڴ����ֽڴ�ӡ���û��ɶ��ַ�
static void show_char(u8 val) {
switch (val) {
case 0 ... 32:
case 127 ... 255:
//ͨ����ʽ�����ʵ��
SAYF("#%02x", val);
break;
default:
SAYF(" %c ", val);
}
}
/* Show the legend */
//���ڴ��ֽ�����Ϊ��ͬ������ɫ�������û�����
static void show_legend(void) {
SAYF(" " cLGR bgGRA " 01 " cRST " - no-op block " cBLK bgLGN
" 01 " cRST
" - suspected length field\n"
" " cBRI bgGRA " 01 " cRST " - superficial content " cBLK bgYEL
" 01 " cRST
" - suspected cksum or magic int\n"
" " cBLK bgCYA " 01 " cRST " - critical stream " cBLK bgLRD
" 01 " cRST
" - suspected checksummed block\n"
" " cBLK bgMGN " 01 " cRST " - \"magic value\" section\n\n");
}
#endif /* USE_COLOR */
/* Interpret and report a pattern in the input file. */
//��16������ʽ�����ļ��������ֽ���Ϊ
static void dump_hex(u32 len, u8 *b_data) {
u32 i;
for (i = 0; i < len; i++) {
#ifdef USE_COLOR
u32 rlen = 1, off;
#else
u32 rlen = 1;
#endif /* ^USE_COLOR */
u8 rtype = b_data[i] & 0x0f;
/* Look ahead to determine the length of run. */
//ȷ�����г���
while (i + rlen < len && (b_data[i] >> 7) == (b_data[i + rlen] >> 7)) {
if (rtype < (b_data[i + rlen] & 0x0f)) {
rtype = b_data[i + rlen] & 0x0f;
}
rlen++;
}
/* Try to do some further classification based on length & value. */
//���ֽ���Ӧ���ͽ��з���
if (rtype == RESP_FIXED) {
switch (rlen) {
case 2: {
u16 val = *(u16 *)(in_data + i);
/* Small integers may be length fields. */
if (val && (val <= in_len || SWAP16(val) <= in_len)) {
//�ж�Ϊ���г���
rtype = RESP_LEN;
break;
}
/* Uniform integers may be checksums. */
if (val && abs(in_data[i] - in_data[i + 1]) > 32) {
//�ж�ΪУ���
rtype = RESP_CKSUM;
break;
}
break;
}
case 4: {
//ͬ��
u32 val = *(u32 *)(in_data + i);
/* Small integers may be length fields. */
if (val && (val <= in_len || SWAP32(val) <= in_len)) {
rtype = RESP_LEN;
break;
}
/* Uniform integers may be checksums. */
if (val && (in_data[i] >> 7 != in_data[i + 1] >> 7 ||
in_data[i] >> 7 != in_data[i + 2] >> 7 ||
in_data[i] >> 7 != in_data[i + 3] >> 7)) {
rtype = RESP_CKSUM;
break;
}
break;
}
case 1:
case 3:
case 5 ... MAX_AUTO_EXTRA - 1:
break;
default:
rtype = RESP_SUSPECT;
}
}
/* Print out the entire run. */
#ifdef USE_COLOR
for (off = 0; off < rlen; off++) {
/* Every 16 digits, display offset. */
//ÿ4���ֽ���Ϊһ��������
if (!((i + off) % 16)) {
if (off) { SAYF(cRST cLCY ">"); }
if (use_hex_offsets) {
//������
SAYF(cRST cGRA "%s[%06x] " cRST, (i + off) ? "\n" : "", i + off);
} else {
//������
SAYF(cRST cGRA "%s[%06u] " cRST, (i + off) ? "\n" : "", i + off);
}
}
switch (rtype) {
//����rtype�����IJ�ͬ���ͣ����в�ͬ����ɫ�������û�����
case RESP_NONE:
SAYF(cLGR bgGRA);
break;
case RESP_MINOR:
SAYF(cBRI bgGRA);
break;
case RESP_VARIABLE:
SAYF(cBLK bgCYA);
break;
case RESP_FIXED:
SAYF(cBLK bgMGN);
break;
case RESP_LEN:
SAYF(cBLK bgLGN);
break;
case RESP_CKSUM:
SAYF(cBLK bgYEL);
break;
case RESP_SUSPECT:
SAYF(cBLK bgLRD);
break;
}
//���
show_char(in_data[i + off]);
if (off != rlen - 1 && (i + off + 1) % 16) {
//����
SAYF(" ");
} else {
SAYF(cRST " ");
}
}
#else
//�����û��Ƿ�����16���ƽ�������Ĵ���
if (use_hex_offsets)
SAYF(" Offset %x, length %u: ", i, rlen);
else
SAYF(" Offset %u, length %u: ", i, rlen);
switch (rtype) {
//������Է����õ�����Ϣ
case RESP_NONE:
SAYF("no-op block\n");
break;
case RESP_MINOR:
SAYF("superficial content\n");
break;
case RESP_VARIABLE:
SAYF("critical stream\n");
break;
case RESP_FIXED:
SAYF("\"magic value\" section\n");
break;
case RESP_LEN:
SAYF("suspected length field\n");
break;
case RESP_CKSUM:
SAYF("suspected cksum or magic int\n");
break;
case RESP_SUSPECT:
SAYF("suspected checksummed block\n");
break;
}
#endif /* ^USE_COLOR */
i += rlen - 1;
}
#ifdef USE_COLOR
SAYF(cRST "\n");
#endif /* USE_COLOR */
}
/* Actually analyze! */
//��������
static void analyze() {
//��ʼ������
u32 i;
u32 boring_len = 0, prev_xff = 0, prev_x01 = 0, prev_s10 = 0, prev_a10 = 0;
u8 *b_data = ck_alloc(in_len + 1);
u8 seq_byte = 0;
b_data[in_len] = 0xff; /* Intentional terminator. */
ACTF("Analyzing input file (this may take a while)...\n");
#ifdef USE_COLOR
show_legend();
#endif /* USE_COLOR */
for (i = 0; i < in_len; i++) {
//���������ÿһ���ֽ�
u64 xor_ff, xor_01, sub_10, add_10;
u8 xff_orig, x01_orig, s10_orig, a10_orig;
/* Perform walking byte adjustments across the file. We perform four
operations designed to elicit some response from the underlying
code. */
//�Գ����ÿ���ֽڽ������0xff�����0x01����0x10����0x20������Ȼ��������з������鿴�Ƿ��Գ�������в���Ӱ��
in_data[i] ^= 0xff;
xor_ff = analyze_run_target(in_data, in_len, 0);
in_data[i] ^= 0xfe;
xor_01 = analyze_run_target(in_data, in_len, 0);
in_data[i] = (in_data[i] ^ 0x01) - 0x10;
sub_10 = analyze_run_target(in_data, in_len, 0);
in_data[i] += 0x20;
add_10 = analyze_run_target(in_data, in_len, 0);
in_data[i] -= 0x10;
/* Classify current behavior. */
//��¼У��ͣ��Թ۲��Ƿ���Ӱ��
xff_orig = (xor_ff == orig_cksum);
x01_orig = (xor_01 == orig_cksum);
s10_orig = (sub_10 == orig_cksum);
a10_orig = (add_10 == orig_cksum);
if (xff_orig && x01_orig && s10_orig && a10_orig) {
//����������������ֽڱ��Ϊ������
b_data[i] = RESP_NONE;
boring_len++;
} else if (xff_orig || x01_orig || s10_orig || a10_orig) {
//��������������
b_data[i] = RESP_MINOR;
boring_len++;
} else if (xor_ff == xor_01 && xor_ff == sub_10 && xor_ff == add_10) {
//���������ͬ��ʽ�ĺ��У�����ȣ����ֽڱ��Ϊ��������
b_data[i] = RESP_FIXED;
} else {
//�������ֽڱ��Ϊ������
b_data[i] = RESP_VARIABLE;
}
/* When all checksums change, flip most significant bit of b_data. */
//������б������������һ���ֽڵIJ��Բ�һ�����ͷ�ת���λ
if (prev_xff != xor_ff && prev_x01 != xor_01 && prev_s10 != sub_10 &&
prev_a10 != add_10) {
seq_byte ^= 0x80;
}
b_data[i] |= seq_byte;
prev_xff = xor_ff;
prev_x01 = xor_01;
prev_s10 = sub_10;
prev_a10 = add_10;
}
//����������
dump_hex(in_len, b_data);
SAYF("\n");
OKF("Analysis complete. Interesting bits: %0.02f%% of the input file.",
100.0 - ((double)boring_len * 100) / in_len);
if (exec_hangs) {
WARNF(cLRD "Encountered %u timeouts - results may be skewed." cRST,
exec_hangs);
}
ck_free(b_data);
}
/* Handle Ctrl-C and the like. */
//�û��Գ���ֹ����Ĵ�������
static void handle_stop_sig(int sig) {
(void)sig;
stop_soon = 1;
afl_fsrv_killall();
}
/* Do basic preparations - persistent fds, filenames, etc. */
//���ò��Ի���
static void set_up_environment(char **argv) {
u8 *x;
char *afl_preload;
char *frida_afl_preload = NULL;
fsrv.dev_null_fd = open("/dev/null", O_RDWR);
if (fsrv.dev_null_fd < 0) { PFATAL("Unable to open /dev/null"); }
if (!fsrv.out_file) {
u8 *use_dir = ".";
if (access(use_dir, R_OK | W_OK | X_OK)) {
use_dir = get_afl_env("TMPDIR");
if (!use_dir) { use_dir = "/tmp"; }
}
fsrv.out_file =
alloc_printf("%s/.afl-analyze-temp-%u", use_dir, (u32)getpid());
}
unlink(fsrv.out_file);
fsrv.out_fd =
open(fsrv.out_file, O_RDWR | O_CREAT | O_EXCL, DEFAULT_PERMISSION);
if (fsrv.out_fd < 0) { PFATAL("Unable to create '%s'", fsrv.out_file); }
/* Set sane defaults... */
x = get_afl_env("MSAN_OPTIONS");
if (x) {
if (!strstr(x, "exit_code=" STRINGIFY(MSAN_ERROR))) {
FATAL("Custom MSAN_OPTIONS set without exit_code=" STRINGIFY(
MSAN_ERROR) " - please fix!");
}
}
set_sanitizer_defaults();
if (get_afl_env("AFL_PRELOAD")) {
if (qemu_mode) {
/* afl-qemu-trace takes care of converting AFL_PRELOAD. */
} else if (frida_mode) {
afl_preload = getenv("AFL_PRELOAD");
u8 *frida_binary = find_afl_binary(argv[0], "afl-frida-trace.so");
if (afl_preload) {
frida_afl_preload = alloc_printf("%s:%s", afl_preload, frida_binary);
} else {
frida_afl_preload = alloc_printf("%s", 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 (frida_mode) {
u8 *frida_binary = find_afl_binary(argv[0], "afl-frida-trace.so");
setenv("LD_PRELOAD", frida_binary, 1);
setenv("DYLD_INSERT_LIBRARIES", frida_binary, 1);
ck_free(frida_binary);
}
if (frida_afl_preload) { ck_free(frida_afl_preload); }
}
/* Setup signal handlers, duh. */
//�����źŴ��������г�ʼ��
static void setup_signal_handlers(void) {
struct sigaction sa;
sa.sa_handler = NULL;
#ifdef SA_RESTART
sa.sa_flags = SA_RESTART;
#else
sa.sa_flags = 0;
#endif
sa.sa_sigaction = NULL;
sigemptyset(&sa.sa_mask);
/* Various ways of saying "stop". */
sa.sa_handler = handle_stop_sig;
sigaction(SIGHUP, &sa, NULL);
sigaction(SIGINT, &sa, NULL);
sigaction(SIGTERM, &sa, NULL);
}
/* Display usage hints. */
//���û�����-hʱ���ô˺��������Ըù��ߵ�ʹ�÷���
static void usage(u8 *argv0) {
SAYF(
"\n%s [ options ] -- /path/to/target_app [ ... ]\n\n"
"Required parameters:\n"
" -i file - input test case to be analyzed by the tool\n\n"
"Execution control settings:\n"
" -f file - input file read by the tested program (stdin)\n"
" -t msec - timeout for each run (%u ms)\n"
" -m megs - memory limit for child process (%u MB)\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"
" -X - use Nyx mode\n"
#endif
"\n"
"Analysis settings:\n"
" -e - look for edge coverage only, ignore hit counts\n\n"
"For additional tips, please consult %s/README.md.\n\n"
"Environment variables used:\n"
"TMPDIR: directory to use for temporary input files\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_ANALYZE_HEX: print file offsets in hexadecimal instead of decimal\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_PRELOAD: LD_PRELOAD / DYLD_INSERT_LIBRARIES settings for target\n"
"AFL_SKIP_BIN_CHECK: skip checking the location of and the target\n"
, argv0, EXEC_TIMEOUT, MEM_LIMIT, doc_path);
exit(1);
}
/* Main entry point */
//main�������û�ʹ�õ�ʵ�ʽӿ�
int main(int argc, char **argv_orig, char **envp) {
s32 opt;
u8 mem_limit_given = 0, timeout_given = 0, unicorn_mode = 0, use_wine = 0;
char **use_argv;
char **argv = argv_cpy_dup(argc, argv_orig);
doc_path = access(DOC_PATH, F_OK) ? "docs" : DOC_PATH;
SAYF(cCYA "afl-analyze" VERSION cRST " by Michal Zalewski\n");
afl_fsrv_init(&fsrv);
while ((opt = getopt(argc, argv, "+i:f:m:t:eAOQUWXYh")) > 0) {
switch (opt) {
case 'i':
if (in_file) { FATAL("Multiple -i options not supported"); }
in_file = optarg;
break;
case 'f':
if (fsrv.out_file) { FATAL("Multiple -f options not supported"); }
fsrv.use_stdin = 0;
fsrv.out_file = ck_strdup(optarg);
break;
case 'e':
if (edges_only) { FATAL("Multiple -e options not supported"); }
edges_only = 1;
break;
case 'm': {
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")) {
mem_limit = 0;
fsrv.mem_limit = 0;
break;
}
if (sscanf(optarg, "%llu%c", &mem_limit, &suffix) < 1 ||
optarg[0] == '-') {
FATAL("Bad syntax used for -m");
}
switch (suffix) {
case 'T':
mem_limit *= 1024 * 1024;
break;
case 'G':
mem_limit *= 1024;
break;
case 'k':
mem_limit /= 1024;
break;
case 'M':
break;
default:
FATAL("Unsupported suffix or bad syntax for -m");
}
if (mem_limit < 5) { FATAL("Dangerously low value of -m"); }
if (sizeof(rlim_t) == 4 && mem_limit > 2000) {
FATAL("Value of -m out of range on 32-bit systems");
}
fsrv.mem_limit = mem_limit;
}
break;
case 't':
if (timeout_given) { FATAL("Multiple -t options not supported"); }
timeout_given = 1;
if (!optarg) { FATAL("Wrong usage of -t"); }
exec_tmout = atoi(optarg);
if (exec_tmout < 10 || optarg[0] == '-') {
FATAL("Dangerously low value of -t");
}
fsrv.exec_tmout = exec_tmout;
break;
case 'A': /* CoreSight mode */
#if !defined(__aarch64__) || !defined(__linux__)
FATAL("-A option is not supported on this platform");
#endif
if (cs_mode) { FATAL("Multiple -A options not supported"); }
cs_mode = 1;
fsrv.cs_mode = cs_mode;
break;
case 'O': /* FRIDA mode */
if (frida_mode) { FATAL("Multiple -O options not supported"); }
frida_mode = 1;
fsrv.frida_mode = frida_mode;
setenv("AFL_FRIDA_INST_SEED", "1", 1);
break;
case 'Q':
if (qemu_mode) { FATAL("Multiple -Q options not supported"); }
if (!mem_limit_given) { mem_limit = MEM_LIMIT_QEMU; }
qemu_mode = 1;
fsrv.mem_limit = mem_limit;
fsrv.qemu_mode = qemu_mode;
break;
case 'U':
if (unicorn_mode) { FATAL("Multiple -U options not supported"); }
if (!mem_limit_given) { mem_limit = MEM_LIMIT_UNICORN; }
unicorn_mode = 1;
fsrv.mem_limit = mem_limit;
break;
case 'W': /* Wine+QEMU mode */
if (use_wine) { FATAL("Multiple -W options not supported"); }
qemu_mode = 1;
use_wine = 1;
if (!mem_limit_given) { mem_limit = 0; }
fsrv.qemu_mode = qemu_mode;
fsrv.mem_limit = mem_limit;
break;
case 'Y': // fallthough
#ifdef __linux__
case 'X': /* NYX mode */
if (fsrv.nyx_mode) { FATAL("Multiple -X options not supported"); }
fsrv.nyx_mode = 1;
fsrv.nyx_parent = true;
fsrv.nyx_standalone = true;
break;
#else
case 'X':
FATAL("Nyx mode is only availabe on linux...");
break;
#endif
case 'h':
usage(argv[0]);
return -1;
break;
default:
usage(argv[0]);
}
}
if (optind == argc || !in_file) { usage(argv[0]); }
map_size = get_map_size();
fsrv.map_size = map_size;
use_hex_offsets = !!get_afl_env("AFL_ANALYZE_HEX");
check_environment_vars(envp);
sharedmem_t shm = {0};
/* initialize cmplog_mode */
shm.cmplog_mode = 0;
atexit(at_exit_handler);
setup_signal_handlers();
set_up_environment(argv);
#ifdef __linux__
if (!fsrv.nyx_mode) {
fsrv.target_path = find_binary(argv[optind]);
} else {
fsrv.target_path = ck_strdup(argv[optind]);
}
#else
fsrv.target_path = find_binary(argv[optind]);
#endif
fsrv.trace_bits = afl_shm_init(&shm, map_size, 0);
detect_file_args(argv + optind, fsrv.out_file, &use_stdin);
signal(SIGALRM, kill_child);
if (qemu_mode) {
if (use_wine) {
use_argv =
get_wine_argv(argv[0], &target_path, argc - optind, argv + optind);
} else {
use_argv =
get_qemu_argv(argv[0], &target_path, argc - optind, argv + optind);
}
} else if (cs_mode) {
use_argv = get_cs_argv(argv[0], &target_path, argc - optind, argv + optind);
#ifdef __linux__
} else if (fsrv.nyx_mode) {
fsrv.nyx_id = 0;
u8 *libnyx_binary = find_afl_binary(argv[0], "libnyx.so");
fsrv.nyx_handlers = afl_load_libnyx_plugin(libnyx_binary);
if (fsrv.nyx_handlers == NULL) {
FATAL("failed to initialize libnyx.so...");
}
fsrv.nyx_use_tmp_workdir = true;
fsrv.nyx_bind_cpu_id = 0;
use_argv = argv + optind;
#endif
} else {
use_argv = argv + optind;
}
SAYF("\n");
if (getenv("AFL_FORKSRV_INIT_TMOUT")) {
s32 forksrv_init_tmout = atoi(getenv("AFL_FORKSRV_INIT_TMOUT"));
if (forksrv_init_tmout < 1) {
FATAL("Bad value specified for AFL_FORKSRV_INIT_TMOUT");
}
fsrv.init_tmout = (u32)forksrv_init_tmout;
}
configure_afl_kill_signals(
&fsrv, NULL, NULL, (fsrv.qemu_mode || unicorn_mode) ? SIGKILL : SIGTERM);
read_initial_file();
#ifdef __linux__
if (!fsrv.nyx_mode) { (void)check_binary_signatures(fsrv.target_path); }
#else
(void)check_binary_signatures(fsrv.target_path);
#endif
ACTF("Performing dry run (mem limit = %llu MB, timeout = %u ms%s)...",
mem_limit, exec_tmout, edges_only ? ", edges only" : "");
afl_fsrv_start(&fsrv, use_argv, &stop_soon, false);
analyze_run_target(in_data, in_len, 1);
if (fsrv.last_run_timed_out) {
FATAL("Target binary times out (adjusting -t may help).");
}
if (get_afl_env("AFL_SKIP_BIN_CHECK") == NULL && !anything_set()) {
FATAL("No instrumentation detected.");
}
analyze();
OKF("We're done here. Have a nice day!\n");
afl_shm_deinit(&shm);
afl_fsrv_deinit(&fsrv);
if (fsrv.target_path) { ck_free(fsrv.target_path); }
if (in_data) { ck_free(in_data); }
exit(0);
}