1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
#include <cstdlib>
#include <cstdio>
#include <iostream>
#include <cstring>
#include <vector>
#include <algorithm>
#include "config.h"
#include <sys/types.h>
#include <sys/shm.h>
#include <unistd.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <fcntl.h>
using namespace std;
static u8 *trace_bits;
static s32 shm_id;
static int __afl_temp_data;
static pid_t __afl_fork_pid;
static unsigned short prev_id;
static long saved_di;
register long rdi asm("di"); // the warning is fine - we need the warning because of a bug in dyninst
#define PRINT_ERROR(string) (void)(write(2, string, strlen(string))+1) // the (...+1) weirdness is so we do not get an ignoring return value warning
void initAflForkServer() {
// we can not use fprint* stdout/stderr functions here, it fucks up some programs
char *shm_env_var = getenv(SHM_ENV_VAR);
if (!shm_env_var) {
PRINT_ERROR("Error getting shm\n");
return;
}
shm_id = atoi(shm_env_var);
trace_bits = (u8 *) shmat(shm_id, NULL, 0);
if (trace_bits == (u8 *) - 1) {
PRINT_ERROR("Error: shmat\n");
return;
}
// enter fork() server thyme!
int n = write(FORKSRV_FD + 1, &__afl_temp_data, 4);
if (n != 4) {
PRINT_ERROR("Error writting fork server\n");
return;
}
while (1) {
n = read(FORKSRV_FD, &__afl_temp_data, 4);
if (n != 4) {
PRINT_ERROR("Error reading fork server\n");
return;
}
__afl_fork_pid = fork();
if (__afl_fork_pid < 0) {
PRINT_ERROR("Error on fork()\n");
return;
}
if (__afl_fork_pid == 0) {
close(FORKSRV_FD);
close(FORKSRV_FD + 1);
break;
} else {
// parrent stuff
n = write(FORKSRV_FD + 1, &__afl_fork_pid, 4);
pid_t temp_pid = waitpid(__afl_fork_pid, &__afl_temp_data, 2);
if (temp_pid == 0) {
return;
}
n = write(FORKSRV_FD + 1, &__afl_temp_data, 4);
}
}
}
// Should be called on basic block entry
void bbCallback(unsigned short id) {
if (trace_bits) {
trace_bits[prev_id ^ id]++;
prev_id = id >> 1;
}
}
void forceCleanExit() {
exit(0);
}
void save_rdi() {
saved_di = rdi;
}
void restore_rdi() {
rdi = saved_di;
}
|
