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
|
// 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.
//go:generate go run gen.go
package csource
import (
"bytes"
"fmt"
"regexp"
"runtime"
"sort"
"strings"
"github.com/google/syzkaller/pkg/osutil"
"github.com/google/syzkaller/prog"
"github.com/google/syzkaller/sys/targets"
)
const (
linux = "linux"
freebsd = "freebsd"
openbsd = "openbsd"
netbsd = "netbsd"
sandboxNone = "none"
sandboxSetuid = "setuid"
sandboxNamespace = "namespace"
sandboxAndroidUntrustedApp = "android_untrusted_app"
)
func createCommonHeader(p, mmapProg *prog.Prog, replacements map[string]string, opts Options) ([]byte, error) {
defines := defineList(p, mmapProg, opts)
sysTarget := targets.Get(p.Target.OS, p.Target.Arch)
cmd := osutil.Command(sysTarget.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", err, stdout.String(), stderr.String())
}
src, err := removeSystemDefines(stdout.Bytes(), defines)
if err != nil {
return nil, err
}
for from, to := range replacements {
src = bytes.Replace(src, []byte("/*"+from+"*/"), []byte(to), -1)
}
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)
}
src = regexp.MustCompile("#define SYZ_HAVE_.*").ReplaceAll(src, nil)
return src, nil
}
func defineList(p, mmapProg *prog.Prog, opts Options) (defines []string) {
sysTarget := targets.Get(p.Target.OS, p.Target.Arch)
bitmasks, csums := prog.RequiredFeatures(p)
enabled := map[string]bool{
"GOOS_" + p.Target.OS: true,
"GOARCH_" + p.Target.Arch: true,
"HOSTGOOS_" + runtime.GOOS: true,
"SYZ_USE_BITMASKS": bitmasks,
"SYZ_USE_CHECKSUMS": csums,
"SYZ_SANDBOX_NONE": opts.Sandbox == sandboxNone,
"SYZ_SANDBOX_SETUID": opts.Sandbox == sandboxSetuid,
"SYZ_SANDBOX_NAMESPACE": opts.Sandbox == sandboxNamespace,
"SYZ_SANDBOX_ANDROID_UNTRUSTED_APP": opts.Sandbox == sandboxAndroidUntrustedApp,
"SYZ_THREADED": opts.Threaded,
"SYZ_COLLIDE": opts.Collide,
"SYZ_REPEAT": opts.Repeat,
"SYZ_REPEAT_TIMES": opts.RepeatTimes > 1,
"SYZ_PROCS": opts.Procs > 1,
"SYZ_FAULT_INJECTION": opts.Fault,
"SYZ_ENABLE_LEAK": opts.Leak,
"SYZ_TUN_ENABLE": opts.EnableTun,
"SYZ_ENABLE_CGROUPS": opts.EnableCgroups,
"SYZ_ENABLE_NETDEV": opts.EnableNetDev,
"SYZ_RESET_NET_NAMESPACE": opts.EnableNetReset,
"SYZ_ENABLE_BINFMT_MISC": opts.EnableBinfmtMisc,
"SYZ_ENABLE_CLOSE_FDS": opts.EnableCloseFds,
"SYZ_USE_TMP_DIR": opts.UseTmpDir,
"SYZ_HANDLE_SEGV": opts.HandleSegv,
"SYZ_REPRO": opts.Repro,
"SYZ_TRACE": opts.Trace,
"SYZ_EXECUTOR_USES_SHMEM": sysTarget.ExecutorUsesShmem,
"SYZ_EXECUTOR_USES_FORK_SERVER": sysTarget.ExecutorUsesForkServer,
}
for def, ok := range enabled {
if ok {
defines = append(defines, def)
}
}
for _, c := range p.Calls {
defines = append(defines, "__NR_"+c.Meta.CallName)
}
for _, c := range mmapProg.Calls {
defines = append(defines, "__NR_"+c.Meta.CallName)
}
sort.Strings(defines)
return
}
func removeSystemDefines(src []byte, defines []string) ([]byte, error) {
remove := map[string]string{
"__STDC__": "1",
"__STDC_HOSTED__": "1",
"__STDC_UTF_16__": "1",
"__STDC_UTF_32__": "1",
}
for _, def := range defines {
eq := strings.IndexByte(def, '=')
if eq == -1 {
remove[def] = "1"
} else {
remove[def[:eq]] = def[eq+1:]
}
}
for def, val := range remove {
src = bytes.Replace(src, []byte("#define "+def+" "+val+"\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
}
|
