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
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
// Copyright 2022 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 instance
import (
"fmt"
"os"
"time"
"github.com/google/syzkaller/pkg/csource"
"github.com/google/syzkaller/pkg/mgrconfig"
"github.com/google/syzkaller/pkg/osutil"
"github.com/google/syzkaller/pkg/report"
"github.com/google/syzkaller/prog"
"github.com/google/syzkaller/sys/targets"
"github.com/google/syzkaller/vm"
)
type ExecutorLogger func(int, string, ...interface{})
type OptionalConfig struct {
Logf ExecutorLogger
OldFlagsCompatMode bool
BeforeContextLen int
StraceBin string
}
type ExecProgInstance struct {
execprogBin string
executorBin string
reporter *report.Reporter
mgrCfg *mgrconfig.Config
VMInstance *vm.Instance
OptionalConfig
}
type RunResult struct {
Output []byte
Report *report.Report
Duration time.Duration
}
const (
// It's reasonable to expect that tools/syz-execprog should not normally
// return a non-zero exit code.
SyzExitConditions = vm.ExitTimeout | vm.ExitNormal
binExitConditions = vm.ExitTimeout | vm.ExitNormal | vm.ExitError
)
func SetupExecProg(vmInst *vm.Instance, mgrCfg *mgrconfig.Config, reporter *report.Reporter,
opt *OptionalConfig) (*ExecProgInstance, error) {
execprogBin, err := vmInst.Copy(mgrCfg.ExecprogBin)
if err != nil {
return nil, &TestError{Title: fmt.Sprintf("failed to copy syz-execprog to VM: %v", err)}
}
executorBin := mgrCfg.SysTarget.ExecutorBin
if executorBin == "" {
executorBin, err = vmInst.Copy(mgrCfg.ExecutorBin)
if err != nil {
return nil, &TestError{Title: fmt.Sprintf("failed to copy syz-executor to VM: %v", err)}
}
}
ret := &ExecProgInstance{
execprogBin: execprogBin,
executorBin: executorBin,
reporter: reporter,
mgrCfg: mgrCfg,
VMInstance: vmInst,
}
if opt != nil {
ret.OptionalConfig = *opt
if ret.StraceBin != "" {
var err error
ret.StraceBin, err = vmInst.Copy(ret.StraceBin)
if err != nil {
return nil, &TestError{Title: fmt.Sprintf("failed to copy strace bin: %v", err)}
}
}
}
if ret.Logf == nil {
ret.Logf = func(int, string, ...interface{}) {}
}
return ret, nil
}
func CreateExecProgInstance(vmPool *vm.Pool, vmIndex int, mgrCfg *mgrconfig.Config,
reporter *report.Reporter, opt *OptionalConfig) (*ExecProgInstance, error) {
vmInst, err := vmPool.Create(vmIndex)
if err != nil {
return nil, fmt.Errorf("failed to create VM: %w", err)
}
ret, err := SetupExecProg(vmInst, mgrCfg, reporter, opt)
if err != nil {
vmInst.Close()
return nil, err
}
return ret, nil
}
func (inst *ExecProgInstance) runCommand(command string, duration time.Duration,
exitCondition vm.ExitCondition) (*RunResult, error) {
start := time.Now()
var prefixOutput []byte
if inst.StraceBin != "" {
filterCalls := ""
switch inst.mgrCfg.SysTarget.OS {
case targets.Linux:
// wait4 and nanosleep generate a lot of noise, especially when running syz-executor.
// We cut them on the VM side in order to decrease load on the network and to use
// the limited buffer size wisely.
filterCalls = ` -e \!wait4,clock_nanosleep,nanosleep`
}
command = inst.StraceBin + filterCalls + ` -s 100 -x -f ` + command
prefixOutput = []byte(fmt.Sprintf("%s\n\n<...>\n", command))
}
opts := []any{exitCondition}
if inst.BeforeContextLen != 0 {
opts = append(opts, vm.OutputSize(inst.BeforeContextLen))
}
output, rep, err := inst.VMInstance.Run(duration, inst.reporter, command, opts...)
if err != nil {
return nil, fmt.Errorf("failed to run command in VM: %w", err)
}
if rep == nil {
inst.Logf(2, "program did not crash")
} else {
if err := inst.reporter.Symbolize(rep); err != nil {
inst.Logf(0, "failed to symbolize report: %v", err)
}
inst.Logf(2, "program crashed: %v", rep.Title)
}
return &RunResult{
Output: append(prefixOutput, output...),
Report: rep,
Duration: time.Since(start),
}, nil
}
func (inst *ExecProgInstance) runBinary(bin string, duration time.Duration) (*RunResult, error) {
bin, err := inst.VMInstance.Copy(bin)
if err != nil {
return nil, &TestError{Title: fmt.Sprintf("failed to copy binary to VM: %v", err)}
}
return inst.runCommand(bin, duration, binExitConditions)
}
func (inst *ExecProgInstance) RunCProg(p *prog.Prog, duration time.Duration,
opts csource.Options) (*RunResult, error) {
src, err := csource.Write(p, opts)
if err != nil {
return nil, err
}
inst.Logf(2, "testing compiled C program (duration=%v, %+v): %s", duration, opts, p)
return inst.RunCProgRaw(src, p.Target, duration)
}
func (inst *ExecProgInstance) RunCProgRaw(src []byte, target *prog.Target,
duration time.Duration) (*RunResult, error) {
bin, err := csource.BuildNoWarn(target, src)
if err != nil {
return nil, err
}
defer os.Remove(bin)
return inst.runBinary(bin, duration)
}
func (inst *ExecProgInstance) RunSyzProgFile(progFile string, duration time.Duration,
opts csource.Options, exitCondition vm.ExitCondition) (*RunResult, error) {
vmProgFile, err := inst.VMInstance.Copy(progFile)
if err != nil {
return nil, &TestError{Title: fmt.Sprintf("failed to copy prog to VM: %v", err)}
}
target := inst.mgrCfg.SysTarget
faultCall := -1
if opts.Fault {
faultCall = opts.FaultCall
}
command := ExecprogCmd(inst.execprogBin, inst.executorBin, target.OS, target.Arch, inst.mgrCfg.Type, opts.Sandbox,
opts.SandboxArg, opts.Repeat, opts.Threaded, opts.Collide, opts.Procs, faultCall, opts.FaultNth,
!inst.OldFlagsCompatMode, inst.mgrCfg.Timeouts.Slowdown, vmProgFile)
return inst.runCommand(command, duration, exitCondition)
}
func (inst *ExecProgInstance) RunSyzProg(syzProg []byte, duration time.Duration,
opts csource.Options, exitCondition vm.ExitCondition) (*RunResult, error) {
progFile, err := osutil.WriteTempFile(syzProg)
if err != nil {
return nil, err
}
defer os.Remove(progFile)
return inst.RunSyzProgFile(progFile, duration, opts, exitCondition)
}
func (inst *ExecProgInstance) Close() {
inst.VMInstance.Close()
}
|
