| 1 | //go:build linux |
| 2 | |
| 3 | package host |
| 4 | |
| 5 | import ( |
| 6 | "io" |
| 7 | "os" |
| 8 | |
| 9 | "github.com/carlosframework/platform/internal/hostbox" |
| 10 | ) |
| 11 | |
| 12 | func servingParkBootID() (string, error) { |
| 13 | f, err := os.Open("/proc/sys/kernel/random/boot_id") |
| 14 | if err != nil { |
| 15 | return "", err |
| 16 | } |
| 17 | defer f.Close() |
| 18 | b, err := io.ReadAll(io.LimitReader(f, 38)) |
| 19 | if err != nil || len(b) != 37 || b[36] != '\n' { |
| 20 | return "", hostbox.ErrChanged |
| 21 | } |
| 22 | return string(b[:36]), nil |
| 23 | } |
| 24 | |
| 25 | func (f *servingParkFS) currentBoot() (string, error) { |
| 26 | if f == nil || f.boot == nil { |
| 27 | return "", hostbox.ErrUnsupported |
| 28 | } |
| 29 | id, err := f.boot() |
| 30 | if err != nil { |
| 31 | return "", err |
| 32 | } |
| 33 | if !validServingParkBootID(id) { |
| 34 | return "", hostbox.ErrChanged |
| 35 | } |
| 36 | return id, nil |
| 37 | } |
| 38 | |
| 39 | // A mount number is meaningful only in the boot that supplied it. Old records |
| 40 | // without a boot remain readable, but cannot authorize namespace mutations. |
| 41 | func (f *servingParkFS) checkBoot(expected string) error { |
| 42 | current, err := f.currentBoot() |
| 43 | if err != nil { |
| 44 | return err |
| 45 | } |
| 46 | if expected == "" || current != expected { |
| 47 | return hostbox.ErrChanged |
| 48 | } |
| 49 | return nil |
| 50 | } |
| 51 | |
| 52 | func (f *servingParkFS) checkRecordBoot(r *servingParkRecord) error { |
| 53 | if r.Source.BootID != "" { |
| 54 | return f.checkBoot(r.Source.BootID) |
| 55 | } |
| 56 | b, err := servingParkReadBinding(f.state, "namespace") |
| 57 | if err != nil { |
| 58 | return err |
| 59 | } |
| 60 | if b != nil { |
| 61 | return hostbox.ErrChanged |
| 62 | } |
| 63 | return nil |
| 64 | } |
| 65 | |
amadan