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
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
// Copyright 2016 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
// This file is shared between executor and csource package.
#include <stdint.h>
#include <string.h>
#if defined(SYZ_EXECUTOR) || defined(SYZ_USE_TMP_DIR)
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#endif
#if defined(SYZ_EXECUTOR) || defined(SYZ_HANDLE_SEGV)
#include <setjmp.h>
#include <signal.h>
#include <string.h>
#endif
#if defined(SYZ_EXECUTOR) || defined(SYZ_DEBUG)
#include <stdarg.h>
#include <stdio.h>
#endif
#if defined(SYZ_EXECUTOR)
// exit/_exit do not necessary work (e.g. if fuzzer sets seccomp filter that prohibits exit_group).
// Use doexit instead. We must redefine exit to something that exists in stdlib,
// because some standard libraries contain "using ::exit;", but has different signature.
#define exit vsnprintf
#define _exit vsnprintf
#endif
#if defined(SYZ_EXECUTOR)
#if defined(__GNUC__)
#define SYSCALLAPI
#define NORETURN __attribute__((noreturn))
#define ALIGNED(N) __attribute__((aligned(N)))
#else
// Assuming windows/cl.
#define SYSCALLAPI WINAPI
#define NORETURN __declspec(noreturn)
#define ALIGNED(N) __declspec(align(N))
#endif
typedef long(SYSCALLAPI* syscall_t)(long, long, long, long, long, long, long, long, long);
struct call_t {
const char* name;
int sys_nr;
syscall_t call;
};
// Defined in generated syscalls_OS.h files.
extern call_t syscalls[];
extern unsigned syscall_count;
#endif
#if defined(SYZ_EXECUTOR) || (defined(SYZ_REPEAT) && defined(SYZ_WAIT_REPEAT)) || \
defined(SYZ_USE_TMP_DIR) || defined(SYZ_TUN_ENABLE) || defined(SYZ_SANDBOX_NAMESPACE) || \
defined(SYZ_SANDBOX_SETUID) || defined(SYZ_FAULT_INJECTION) || defined(__NR_syz_kvm_setup_cpu)
const int kFailStatus = 67;
const int kRetryStatus = 69;
#endif
#if defined(SYZ_EXECUTOR)
const int kErrorStatus = 68;
#endif
#if defined(SYZ_EXECUTOR) || (defined(SYZ_REPEAT) && defined(SYZ_WAIT_REPEAT)) || \
defined(SYZ_USE_TMP_DIR) || defined(SYZ_TUN_ENABLE) || defined(SYZ_SANDBOX_NAMESPACE) || \
defined(SYZ_SANDBOX_SETUID) || defined(SYZ_FAULT_INJECTION) || defined(__NR_syz_kvm_setup_cpu)
// logical error (e.g. invalid input program), use as an assert() alernative
NORETURN static void fail(const char* msg, ...)
{
int e = errno;
va_list args;
va_start(args, msg);
vfprintf(stderr, msg, args);
va_end(args);
fprintf(stderr, " (errno %d)\n", e);
// ENOMEM/EAGAIN is frequent cause of failures in fuzzing context,
// so handle it here as non-fatal error.
doexit((e == ENOMEM || e == EAGAIN) ? kRetryStatus : kFailStatus);
}
#endif
#if defined(SYZ_EXECUTOR)
// kernel error (e.g. wrong syscall return value)
NORETURN static void error(const char* msg, ...)
{
va_list args;
va_start(args, msg);
vfprintf(stderr, msg, args);
va_end(args);
fprintf(stderr, "\n");
doexit(kErrorStatus);
}
#endif
#if defined(SYZ_EXECUTOR) || (defined(SYZ_REPEAT) && defined(SYZ_WAIT_REPEAT) && defined(SYZ_USE_TMP_DIR))
// just exit (e.g. due to temporal ENOMEM error)
NORETURN static void exitf(const char* msg, ...)
{
int e = errno;
va_list args;
va_start(args, msg);
vfprintf(stderr, msg, args);
va_end(args);
fprintf(stderr, " (errno %d)\n", e);
doexit(kRetryStatus);
}
#endif
#if defined(SYZ_EXECUTOR) || defined(SYZ_DEBUG)
static int flag_debug;
static void debug(const char* msg, ...)
{
if (!flag_debug)
return;
va_list args;
va_start(args, msg);
vfprintf(stderr, msg, args);
va_end(args);
fflush(stderr);
}
#endif
#if defined(SYZ_EXECUTOR) || defined(SYZ_USE_BITMASKS)
#define BITMASK_LEN(type, bf_len) (type)((1ull << (bf_len)) - 1)
#define BITMASK_LEN_OFF(type, bf_off, bf_len) (type)(BITMASK_LEN(type, (bf_len)) << (bf_off))
#define STORE_BY_BITMASK(type, addr, val, bf_off, bf_len) \
if ((bf_off) == 0 && (bf_len) == 0) { \
*(type*)(addr) = (type)(val); \
} else { \
type new_val = *(type*)(addr); \
new_val &= ~BITMASK_LEN_OFF(type, (bf_off), (bf_len)); \
new_val |= ((type)(val)&BITMASK_LEN(type, (bf_len))) << (bf_off); \
*(type*)(addr) = new_val; \
}
#endif
#if defined(SYZ_EXECUTOR) || defined(SYZ_USE_CHECKSUMS)
struct csum_inet {
uint32_t acc;
};
static void csum_inet_init(struct csum_inet* csum)
{
csum->acc = 0;
}
static void csum_inet_update(struct csum_inet* csum, const uint8_t* data, size_t length)
{
if (length == 0)
return;
size_t i;
for (i = 0; i < length - 1; i += 2)
csum->acc += *(uint16_t*)&data[i];
if (length & 1)
csum->acc += (uint16_t)data[length - 1];
while (csum->acc > 0xffff)
csum->acc = (csum->acc & 0xffff) + (csum->acc >> 16);
}
static uint16_t csum_inet_digest(struct csum_inet* csum)
{
return ~csum->acc;
}
#endif
|
