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
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
|
#include "socketfuzzer.h"
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <libgen.h>
#include <pthread.h>
#include <signal.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/un.h>
#include <time.h>
#include <unistd.h>
#include "honggfuzz.h"
#include "libhfcommon/common.h"
#include "libhfcommon/files.h"
#include "libhfcommon/log.h"
#include "libhfcommon/ns.h"
#include "libhfcommon/util.h"
bool fuzz_waitForExternalInput(run_t* run) {
/* if the target crashed, we need to identify here and return false,
so honggfuzz will restart it, and the fuzzing loop */
if (run->crashFileName[0] != '\0') {
LOG_E("Target has crashed.");
return false;
}
/* tell the external fuzzer to do his thing */
if (!fuzz_prepareSocketFuzzer(run)) {
LOG_E("fuzz_prepareSocketFuzzer() failed");
}
/* the external fuzzer may inform us of a crash */
int result = fuzz_waitforSocketFuzzer(run);
if (result == 2) {
return false;
}
return true;
}
bool fuzz_prepareSocketFuzzer(run_t* run) {
// Notify fuzzer that he should send teh things
LOG_D("fuzz_prepareSocketFuzzer: SEND Fuzz");
return files_sendToSocket(
run->global->socketFuzzer.clientSocket, (uint8_t*)"Fuzz", strlen("Fuzz"));
}
/* Return values:
0: error
1: okay
2: target unresponsive
*/
int fuzz_waitforSocketFuzzer(run_t* run) {
ssize_t ret;
uint8_t buf[16];
// Wait until the external fuzzer did his thing
bzero(buf, 16);
ret = files_readFromFd(run->global->socketFuzzer.clientSocket, buf, 4);
LOG_D("fuzz_waitforSocketFuzzer: RECV: %s", buf);
// We dont care what we receive, its just to block here
if (ret < 0) {
LOG_E("fuzz_waitforSocketFuzzer: received: %zu", ret);
}
if (memcmp(buf, "okay", 4) == 0) {
return 1;
} else if (memcmp(buf, "bad!", 4) == 0) {
return 2;
} else if (memcmp(buf, "halt", 4) == 0) {
LOG_D("External fuzzer ordered us to shut down.");
if (run->pid) {
kill(run->pid, SIGKILL);
}
exit(0);
}
return 0;
}
bool fuzz_notifySocketFuzzerNewCov(honggfuzz_t* hfuzz) {
// Tell the fuzzer that the thing he sent reached new BB's
bool ret = files_sendToSocket(hfuzz->socketFuzzer.clientSocket, (uint8_t*)"New!", 4);
LOG_D("fuzz_notifySocketFuzzer: SEND: New!");
if (!ret) {
LOG_E("fuzz_notifySocketFuzzer");
}
return true;
}
bool fuzz_notifySocketFuzzerCrash(run_t* run) {
bool ret = files_sendToSocket(run->global->socketFuzzer.clientSocket, (uint8_t*)"Cras", 4);
LOG_D("fuzz_notifySocketFuzzer: SEND: Crash");
if (!ret) {
LOG_E("fuzz_notifySocketFuzzer");
}
return true;
}
bool setupSocketFuzzer(honggfuzz_t* run) {
int s, len;
socklen_t t;
struct sockaddr_un local, remote;
char socketPath[512];
snprintf(socketPath, sizeof(socketPath), "/tmp/honggfuzz_socket.%i", getpid());
if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
perror("socket");
return false;
}
local.sun_family = AF_UNIX;
strcpy(local.sun_path, socketPath);
unlink(local.sun_path);
len = strlen(local.sun_path) + sizeof(local.sun_family);
if (bind(s, (struct sockaddr*)&local, len) == -1) {
perror("bind");
return false;
}
if (listen(s, 5) == -1) {
perror("listen");
return false;
}
printf("Waiting for SocketFuzzer connection on socket: %s\n", socketPath);
t = sizeof(remote);
if ((run->socketFuzzer.clientSocket =
TEMP_FAILURE_RETRY(accept(s, (struct sockaddr*)&remote, &t))) == -1) {
perror("accept");
return false;
}
run->socketFuzzer.serverSocket = s;
printf("A SocketFuzzer client connected. Continuing.\n");
return true;
}
void cleanupSocketFuzzer() {
char socketPath[512];
snprintf(socketPath, sizeof(socketPath), "/tmp/honggfuzz_socket.%i", getpid());
unlink(socketPath);
}
|
