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
|
//go:build testtool
package main
import (
"flag"
"fmt"
"log"
"os"
"os/signal"
"strconv"
"strings"
"syscall"
"hakurei.app/test/sandbox"
)
var (
flagMarkerPath string
flagTestCase string
flagBpfHash string
)
func init() {
flag.StringVar(&flagMarkerPath, "p", "/tmp/sandbox-ok", "Pathname of completion marker")
flag.StringVar(&flagTestCase, "t", "", "Nix store path to test case file")
flag.StringVar(&flagBpfHash, "s", "", "String representation of expected bpf sha512 hash")
}
func main() {
log.SetFlags(0)
log.SetPrefix("test: ")
flag.Parse()
args := flag.Args()
if len(args) < 1 {
s := make(chan os.Signal, 1)
signal.Notify(s, syscall.SIGINT)
go func() { <-s; log.Println("exiting on signal (likely from verifier)"); os.Exit(0) }()
(&sandbox.T{FS: os.DirFS("/")}).MustCheckFile(flagTestCase)
if _, err := os.Create(flagMarkerPath); err != nil {
log.Fatalf("cannot create success marker: %v", err)
}
log.Printf("blocking for seccomp check (%s)", flagMarkerPath)
select {}
return
}
switch args[0] {
case "filter":
if len(args) != 2 {
log.Fatal("invalid argument")
}
if pid, err := strconv.Atoi(strings.TrimSpace(args[1])); err != nil {
log.Fatalf("%s", err)
} else if pid < 1 {
log.Fatalf("%d out of range", pid)
} else {
sandbox.MustCheckFilter(pid, flagBpfHash)
if err = syscall.Kill(pid, syscall.SIGINT); err != nil {
log.Fatalf("cannot signal check process: %v", err)
}
}
case "hash": // this eases the pain of passing the hash to python
fmt.Print(flagBpfHash)
case "fd":
if len(args) != 2 {
log.Fatal("invalid argument")
}
prefix := fmt.Sprintf("/proc/%s/fd/", args[1])
var fail bool
if entries, err := os.ReadDir(prefix); err != nil {
log.Fatal(err.Error())
} else {
for _, ent := range entries {
var fd int
if fd, err = strconv.Atoi(ent.Name()); err != nil {
log.Fatal(err.Error())
}
// skip standard streams
if fd <= 2 {
continue
}
fail = true
var d string
if d, err = os.Readlink(prefix + ent.Name()); err != nil {
log.Fatal(err.Error())
}
log.Printf("[FAIL] extra fd %d -> %s", fd, d)
}
}
if fail {
log.Fatal("[FAIL] file descriptors leaked")
}
default:
log.Fatal("invalid argument")
}
}
|
