| 1 | //go:build linux |
| 2 | |
| 3 | package host |
| 4 | |
| 5 | import ( |
| 6 | "github.com/carlosframework/platform/internal/release" |
| 7 | "os" |
| 8 | "os/exec" |
| 9 | "path/filepath" |
| 10 | "strconv" |
| 11 | "strings" |
| 12 | "testing" |
| 13 | ) |
| 14 | |
| 15 | func TestPlan14GenerationKernelRunningExecutable(t *testing.T) { |
| 16 | for _, change := range []string{"running", "deleted", "parent-renamed"} { |
| 17 | t.Run(change, func(t *testing.T) { |
| 18 | f := generationProc(t) |
| 19 | b := f.reservation.Binding |
| 20 | body, err := os.ReadFile("/bin/sleep") |
| 21 | if err != nil { |
| 22 | t.Fatal(err) |
| 23 | } |
| 24 | if err := os.WriteFile(b.Path, body, 0700); err != nil { |
| 25 | t.Fatal(err) |
| 26 | } |
| 27 | if err := os.Chmod(b.Path, 0700); err != nil { |
| 28 | t.Fatal(err) |
| 29 | } |
| 30 | cmd := exec.Command(b.Path, "60") |
| 31 | cmd.Dir = t.TempDir() |
| 32 | if err := cmd.Start(); err != nil { |
| 33 | t.Fatal(err) |
| 34 | } |
| 35 | joined := false |
| 36 | defer func() { |
| 37 | if !joined { |
| 38 | _ = cmd.Process.Kill() |
| 39 | _ = cmd.Wait() |
| 40 | } |
| 41 | }() |
| 42 | proc := filepath.Join("/proc", strconv.Itoa(cmd.Process.Pid)) |
| 43 | raw, err := generationRead(proc + "/stat") |
| 44 | if err != nil { |
| 45 | t.Fatal(err) |
| 46 | } |
| 47 | start, err := generationStart(raw) |
| 48 | if err != nil { |
| 49 | t.Fatal(err) |
| 50 | } |
| 51 | // The copied binary kept the staged inode. Read the real proc link, not |
| 52 | // the fake launch fixture's claim that it observed a process. |
| 53 | generationRelink(t, proc+"/exe", f.task+"/exe") |
| 54 | switch change { |
| 55 | case "deleted": |
| 56 | if err := os.Remove(b.Path); err != nil { |
| 57 | t.Fatal(err) |
| 58 | } |
| 59 | case "parent-renamed": |
| 60 | if err := os.Rename(b.Tree, b.Tree+".old"); err != nil { |
| 61 | t.Fatal(err) |
| 62 | } |
| 63 | } |
| 64 | if err := generationLinkRef(proc+"/exe", b); err == nil { |
| 65 | t.Fatal("running executable not found") |
| 66 | } |
| 67 | if _, err := (generationKernel{proc: f.proc}).absent(t.Context(), f.reservation); err == nil { |
| 68 | t.Fatal("running tenant released") |
| 69 | } |
| 70 | actual := b |
| 71 | actual.ControllerPID = cmd.Process.Pid |
| 72 | actual.ControllerStart = start |
| 73 | actual.Target.BootID, err = (generationKernel{proc: "/proc"}).boot() |
| 74 | if err != nil { |
| 75 | t.Fatal(err) |
| 76 | } |
| 77 | if err := (generationKernel{proc: "/proc"}).controllerGone(t.Context(), actual); err == nil { |
| 78 | t.Fatal("live process reported joined") |
| 79 | } |
| 80 | if err := cmd.Process.Kill(); err != nil { |
| 81 | t.Fatal(err) |
| 82 | } |
| 83 | _ = cmd.Wait() |
| 84 | joined = true |
| 85 | if err := (generationKernel{proc: "/proc"}).controllerGone(t.Context(), actual); err != nil { |
| 86 | t.Fatal(err) |
| 87 | } |
| 88 | generationRelink(t, f.unrelated, f.task+"/exe") |
| 89 | _, err = (generationKernel{proc: f.proc}).absent(t.Context(), f.reservation) |
| 90 | if (err == nil) != (change != "parent-renamed") { |
| 91 | t.Fatalf("after join: %v", err) |
| 92 | } |
| 93 | }) |
| 94 | } |
| 95 | } |
| 96 | |
| 97 | func TestPlan14GenerationKernelCgroup(t *testing.T) { |
| 98 | for _, attack := range []string{"absent", "empty", "populated", "replaced", "unknown-child", "pending-present", "unreadable"} { |
| 99 | t.Run(attack, func(t *testing.T) { |
| 100 | f, d, _ := generationLaunchFixture(t) |
| 101 | if _, err := f.root.Serve(t.Context(), f.peer, f.req); err != nil { |
| 102 | t.Fatal(err) |
| 103 | } |
| 104 | r := readGenerationLaunch(t, d) |
| 105 | boot, err := os.ReadFile("/proc/sys/kernel/random/boot_id") |
| 106 | if err != nil { |
| 107 | t.Fatal(err) |
| 108 | } |
| 109 | r.Binding.Target.BootID = strings.TrimSpace(string(boot)) |
| 110 | root := t.TempDir() |
| 111 | group := filepath.Join(root, r.Process.Group) |
| 112 | if attack != "absent" { |
| 113 | if err := os.MkdirAll(group, 0700); err != nil { |
| 114 | t.Fatal(err) |
| 115 | } |
| 116 | id, err := stopIdentity(group) |
| 117 | if err != nil { |
| 118 | t.Fatal(err) |
| 119 | } |
| 120 | r.Process.GroupIdentity.Device, r.Process.GroupIdentity.Inode = id.Device, id.Inode |
| 121 | generationWrite(t, group+"/cgroup.events", "populated 0\n") |
| 122 | } |
| 123 | switch attack { |
| 124 | case "populated": |
| 125 | generationWrite(t, group+"/cgroup.events", "populated 1\n") |
| 126 | case "replaced": |
| 127 | r.Process.GroupIdentity.Inode++ |
| 128 | case "unknown-child": |
| 129 | if err := os.Mkdir(group+"/child", 0700); err != nil { |
| 130 | t.Fatal(err) |
| 131 | } |
| 132 | case "pending-present": |
| 133 | r.Process = release.GenerationProcess{} |
| 134 | case "unreadable": |
| 135 | if err := os.Remove(group + "/cgroup.events"); err != nil { |
| 136 | t.Fatal(err) |
| 137 | } |
| 138 | } |
| 139 | err = generationGroupGone(t.Context(), root, r) |
| 140 | allow := attack == "absent" || attack == "empty" |
| 141 | if (err == nil) != allow { |
| 142 | t.Fatalf("group check=%v allow=%t", err, allow) |
| 143 | } |
| 144 | }) |
| 145 | } |
| 146 | } |
| 147 | |
amadan