| 1 | //go:build linux |
| 2 | |
| 3 | package instanceexec |
| 4 | |
| 5 | import ( |
| 6 | "errors" |
| 7 | "os" |
| 8 | "os/exec" |
| 9 | "runtime" |
| 10 | "testing" |
| 11 | |
| 12 | "golang.org/x/sys/unix" |
| 13 | ) |
| 14 | |
| 15 | func TestPlan14ClaimGenerationDescriptorBoundary(t *testing.T) { |
| 16 | if os.Getenv("PLAN14_CLAIM_GENERATION_CHILD") == "1" { |
| 17 | runtime.LockOSThread() |
| 18 | if err := ScopeClaimGeneration(); err != nil { |
| 19 | t.Fatal(err) |
| 20 | } |
| 21 | for _, call := range []uintptr{unix.SYS_RECVMSG, unix.SYS_RECVMMSG, unix.SYS_PTRACE, unix.SYS_PIDFD_GETFD, unix.SYS_OPEN_BY_HANDLE_AT, unix.SYS_IO_URING_SETUP, unix.SYS_IO_URING_ENTER, unix.SYS_IO_URING_REGISTER, unix.SYS_SETNS, unix.SYS_UNSHARE} { |
| 22 | _, _, err := unix.RawSyscall6(call, ^uintptr(0), 0, 0, 0, 0, 0) |
| 23 | if err != unix.EPERM { |
| 24 | t.Fatalf("syscall %d: %v; want EPERM", call, err) |
| 25 | } |
| 26 | } |
| 27 | data, control := make([]byte, 1), make([]byte, unix.CmsgSpace(4)) |
| 28 | if _, _, _, _, err := unix.Recvmsg(3, data, control, 0); !errors.Is(err, unix.EPERM) { |
| 29 | t.Fatal("descriptor receipt permitted", err) |
| 30 | } |
| 31 | if n, err := unix.Read(3, data); err != nil || n != 1 || data[0] != 'x' { |
| 32 | t.Fatal("ordinary socket read failed", n, err) |
| 33 | } |
| 34 | return |
| 35 | } |
| 36 | sockets, err := unix.Socketpair(unix.AF_UNIX, unix.SOCK_STREAM|unix.SOCK_CLOEXEC, 0) |
| 37 | if err != nil { |
| 38 | t.Fatal(err) |
| 39 | } |
| 40 | parent, child := os.NewFile(uintptr(sockets[0]), "parent"), os.NewFile(uintptr(sockets[1]), "child") |
| 41 | defer parent.Close() |
| 42 | defer child.Close() |
| 43 | file, err := os.CreateTemp(t.TempDir(), "staged") |
| 44 | if err != nil { |
| 45 | t.Fatal(err) |
| 46 | } |
| 47 | defer file.Close() |
| 48 | if err := unix.Sendmsg(int(parent.Fd()), []byte{'x'}, unix.UnixRights(int(file.Fd())), nil, 0); err != nil { |
| 49 | t.Fatal(err) |
| 50 | } |
| 51 | cmd := exec.Command(os.Args[0], "-test.run=^TestPlan14ClaimGenerationDescriptorBoundary$") |
| 52 | cmd.Env = append(os.Environ(), "PLAN14_CLAIM_GENERATION_CHILD=1") |
| 53 | cmd.ExtraFiles = []*os.File{child} |
| 54 | if out, err := cmd.CombinedOutput(); err != nil { |
| 55 | t.Fatalf("boundary child: %v\n%s", err, out) |
| 56 | } |
| 57 | } |
| 58 | |
| 59 | func TestPlan14ClaimGenerationNamespaceBoundary(t *testing.T) { |
| 60 | if os.Getenv("PLAN14_CLAIM_NAMESPACE_CHILD") == "1" { |
| 61 | runtime.LockOSThread() |
| 62 | if err := ScopeClaimGeneration(); err != nil { |
| 63 | t.Fatal(err) |
| 64 | } |
| 65 | _, _, err := unix.RawSyscall6(unix.SYS_CLONE, uintptr(unix.CLONE_NEWUSER|unix.CLONE_THREAD), 0, 0, 0, 0, 0) |
| 66 | if err != unix.EPERM { |
| 67 | t.Fatal("namespace clone permitted", err) |
| 68 | } |
| 69 | _, _, err = unix.RawSyscall6(unix.SYS_CLONE3, 0, 0, 0, 0, 0, 0) |
| 70 | if err != unix.ENOSYS { |
| 71 | t.Fatal("clone3 permitted", err) |
| 72 | } |
| 73 | cmd := exec.Command("/bin/true") |
| 74 | if out, err := cmd.CombinedOutput(); err != nil { |
| 75 | t.Fatalf("ordinary fork/exec: %v %s", err, out) |
| 76 | } |
| 77 | return |
| 78 | } |
| 79 | cmd := exec.Command(os.Args[0], "-test.run=^TestPlan14ClaimGenerationNamespaceBoundary$") |
| 80 | cmd.Env = append(os.Environ(), "PLAN14_CLAIM_NAMESPACE_CHILD=1") |
| 81 | if out, err := cmd.CombinedOutput(); err != nil { |
| 82 | t.Fatalf("namespace boundary: %v\n%s", err, out) |
| 83 | } |
| 84 | } |
| 85 | |
amadan