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
|
// Copyright 2017 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.
package csource
import (
"bytes"
"fmt"
"strings"
"github.com/google/syzkaller/pkg/osutil"
"github.com/google/syzkaller/prog"
"github.com/google/syzkaller/sys/targets"
)
func createCommonHeader(p *prog.Prog, opts Options) ([]byte, error) {
commonHeader, err := getCommonHeader(p.Target.OS)
if err != nil {
return nil, err
}
defines, err := defineList(p, opts)
if err != nil {
return nil, err
}
cmd := osutil.Command("cpp", "-nostdinc", "-undef", "-fdirectives-only", "-dDI", "-E", "-P", "-")
for _, def := range defines {
cmd.Args = append(cmd.Args, "-D"+def)
}
cmd.Stdin = strings.NewReader(commonHeader)
stderr := new(bytes.Buffer)
stdout := new(bytes.Buffer)
cmd.Stderr = stderr
cmd.Stdout = stdout
if err := cmd.Run(); len(stdout.Bytes()) == 0 {
return nil, fmt.Errorf("cpp failed: %v\n%v\n%v\n", err, stdout.String(), stderr.String())
}
src, err := removeSystemDefines(stdout.Bytes(), defines)
if err != nil {
return nil, err
}
for from, to := range map[string]string{
"uint64": "uint64_t",
"uint32": "uint32_t",
"uint16": "uint16_t",
"uint8": "uint8_t",
} {
src = bytes.Replace(src, []byte(from), []byte(to), -1)
}
return src, nil
}
func defineList(p *prog.Prog, opts Options) ([]string, error) {
var defines []string
if prog.RequiresBitmasks(p) {
defines = append(defines, "SYZ_USE_BITMASKS")
}
if prog.RequiresChecksums(p) {
defines = append(defines, "SYZ_USE_CHECKSUMS")
}
switch opts.Sandbox {
case "":
// No sandbox, do nothing.
case "none":
defines = append(defines, "SYZ_SANDBOX_NONE")
case "setuid":
defines = append(defines, "SYZ_SANDBOX_SETUID")
case "namespace":
defines = append(defines, "SYZ_SANDBOX_NAMESPACE")
default:
return nil, fmt.Errorf("unknown sandbox mode: %v", opts.Sandbox)
}
if opts.Threaded {
defines = append(defines, "SYZ_THREADED")
}
if opts.Collide {
defines = append(defines, "SYZ_COLLIDE")
}
if opts.Repeat {
defines = append(defines, "SYZ_REPEAT")
}
if opts.Fault {
defines = append(defines, "SYZ_FAULT_INJECTION")
}
if opts.EnableTun {
defines = append(defines, "SYZ_TUN_ENABLE")
}
if opts.UseTmpDir {
defines = append(defines, "SYZ_USE_TMP_DIR")
}
if opts.HandleSegv {
defines = append(defines, "SYZ_HANDLE_SEGV")
}
if opts.WaitRepeat {
defines = append(defines, "SYZ_WAIT_REPEAT")
}
if opts.Debug {
defines = append(defines, "SYZ_DEBUG")
}
for _, c := range p.Calls {
defines = append(defines, "__NR_"+c.Meta.CallName)
}
defines = append(defines, targets.List[p.Target.OS][p.Target.Arch].CArch...)
return defines, nil
}
func removeSystemDefines(src []byte, defines []string) ([]byte, error) {
remove := append(defines, []string{
"__STDC__",
"__STDC_HOSTED__",
"__STDC_UTF_16__",
"__STDC_UTF_32__",
}...)
for _, def := range remove {
src = bytes.Replace(src, []byte("#define "+def+" 1\n"), nil, -1)
}
// strip: #define __STDC_VERSION__ 201112L
for _, def := range []string{"__STDC_VERSION__"} {
pos := bytes.Index(src, []byte("#define "+def))
if pos == -1 {
continue
}
end := bytes.IndexByte(src[pos:], '\n')
if end == -1 {
continue
}
src = bytes.Replace(src, src[pos:end+1], nil, -1)
}
return src, nil
}
|
