| 1 | //go:build linux && rootrunner |
| 2 | |
| 3 | package host |
| 4 | |
| 5 | import ( |
| 6 | "os" |
| 7 | "os/exec" |
| 8 | "path/filepath" |
| 9 | "testing" |
| 10 | |
| 11 | "golang.org/x/sys/unix" |
| 12 | ) |
| 13 | |
| 14 | func TestPlan14GenerationKernelCensusRootRunner(t *testing.T) { |
| 15 | if dir := os.Getenv("PLAN14_E24_KERNEL_CHILD"); dir != "" { |
| 16 | t.Setenv("CARLOS_OPT_DIR", dir) |
| 17 | path := filepath.Join(dir, "versions", "v1", "app") |
| 18 | if err := os.MkdirAll(filepath.Dir(path), 0755); err != nil { |
| 19 | t.Fatal(err) |
| 20 | } |
| 21 | if err := os.WriteFile(path, []byte("root census reference"), 0644); err != nil { |
| 22 | t.Fatal(err) |
| 23 | } |
| 24 | if boot, digest, err := productionGenerationKernelCensus(t.Context()); err != nil || boot == "" || len(digest) != 64 { |
| 25 | t.Fatalf("quiescent census: %s %s %v", boot, digest, err) |
| 26 | } |
| 27 | file, err := os.Open(path) |
| 28 | if err != nil { |
| 29 | t.Fatal(err) |
| 30 | } |
| 31 | if _, _, err := productionGenerationKernelCensus(t.Context()); err == nil { |
| 32 | file.Close() |
| 33 | t.Fatal("open unreserved file certified") |
| 34 | } |
| 35 | if err := os.Remove(path); err != nil { |
| 36 | file.Close() |
| 37 | t.Fatal(err) |
| 38 | } |
| 39 | if _, _, err := productionGenerationKernelCensus(t.Context()); err == nil { |
| 40 | file.Close() |
| 41 | t.Fatal("deleted open file certified") |
| 42 | } |
| 43 | file.Close() |
| 44 | if _, _, err := productionGenerationKernelCensus(t.Context()); err != nil { |
| 45 | t.Fatal("closed file still retained", err) |
| 46 | } |
| 47 | if err := os.WriteFile(path, []byte("root census reference"), 0644); err != nil { |
| 48 | t.Fatal(err) |
| 49 | } |
| 50 | alias := filepath.Join(dir, "alias") |
| 51 | if err := os.Mkdir(alias, 0755); err != nil { |
| 52 | t.Fatal(err) |
| 53 | } |
| 54 | if err := unix.Mount(filepath.Dir(path), alias, "", unix.MS_BIND, ""); err != nil { |
| 55 | t.Fatal(err) |
| 56 | } |
| 57 | mounted := true |
| 58 | t.Cleanup(func() { |
| 59 | if mounted { |
| 60 | if err := unix.Unmount(alias, 0); err != nil { |
| 61 | t.Error(err) |
| 62 | } |
| 63 | } |
| 64 | }) |
| 65 | if _, _, err := productionGenerationKernelCensus(t.Context()); err == nil { |
| 66 | t.Fatal("bind alias certified") |
| 67 | } |
| 68 | if err := unix.Unmount(alias, 0); err != nil { |
| 69 | t.Fatal(err) |
| 70 | } |
| 71 | mounted = false |
| 72 | ns, err := os.Open("/proc/self/ns/mnt") |
| 73 | if err != nil { |
| 74 | t.Fatal(err) |
| 75 | } |
| 76 | if _, _, err := productionGenerationKernelCensus(t.Context()); err == nil { |
| 77 | ns.Close() |
| 78 | t.Fatal("retained namespace descriptor certified") |
| 79 | } |
| 80 | ns.Close() |
| 81 | if _, _, err := productionGenerationKernelCensus(t.Context()); err != nil { |
| 82 | t.Fatal("released references still retained", err) |
| 83 | } |
| 84 | return |
| 85 | } |
| 86 | dir := generationRootRunnerDir(t) |
| 87 | // A private PID/mount namespace gives the scan a controlled all-root census. |
| 88 | // No generated tenant unit or running-tenant containment is accepted here. |
| 89 | cmd := exec.CommandContext(t.Context(), "unshare", "--mount", "--pid", "--fork", "--mount-proc", os.Args[0], "-test.run=^TestPlan14GenerationKernelCensusRootRunner$", "-test.count=1") |
| 90 | cmd.Dir = dir |
| 91 | cmd.Env = append(os.Environ(), "PLAN14_E24_KERNEL_CHILD="+dir) |
| 92 | if out, err := cmd.CombinedOutput(); err != nil { |
| 93 | t.Fatalf("isolated root census: %v %s", err, out) |
| 94 | } |
| 95 | } |
| 96 | |
amadan