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package sandbox
import (
"encoding/gob"
"fmt"
"math"
"os"
"path"
"syscall"
"unsafe"
)
func init() { gob.Register(new(BindMount)) }
// BindMount bind mounts host path Source on container path Target.
type BindMount struct {
Source, Target string
Flags int
}
func (b *BindMount) apply(*InitParams) error {
if !path.IsAbs(b.Source) || !path.IsAbs(b.Target) {
return msg.WrapErr(syscall.EBADE,
"path is not absolute")
}
return bindMount(b.Source, b.Target, b.Flags)
}
func (b *BindMount) Is(op Op) bool { vb, ok := op.(*BindMount); return ok && *b == *vb }
func (b *BindMount) String() string {
if b.Source == b.Target {
return fmt.Sprintf("%q flags %#x", b.Source, b.Flags)
}
return fmt.Sprintf("%q on %q flags %#x", b.Source, b.Target, b.Flags&BindWritable)
}
func (f *Ops) Bind(source, target string, flags int) *Ops {
*f = append(*f, &BindMount{source, target, flags | BindRecursive})
return f
}
func init() { gob.Register(new(MountProc)) }
// MountProc mounts a private proc instance on container Path.
type MountProc struct {
Path string
}
func (p *MountProc) apply(*InitParams) error {
if !path.IsAbs(p.Path) {
return msg.WrapErr(syscall.EBADE,
fmt.Sprintf("path %q is not absolute", p.Path))
}
target := toSysroot(p.Path)
if err := os.MkdirAll(target, 0755); err != nil {
return msg.WrapErr(err, err.Error())
}
return wrapErrSuffix(syscall.Mount("proc", target, "proc",
syscall.MS_NOSUID|syscall.MS_NOEXEC|syscall.MS_NODEV, ""),
fmt.Sprintf("cannot mount proc on %q:", p.Path))
}
func init() { gob.Register(new(MountDev)) }
// MountDev mounts dev on container Path.
type MountDev struct {
Path string
}
func (d *MountDev) apply(params *InitParams) error {
if !path.IsAbs(d.Path) {
return msg.WrapErr(syscall.EBADE,
fmt.Sprintf("path %q is not absolute", d.Path))
}
target := toSysroot(d.Path)
if err := mountTmpfs("devtmpfs", d.Path, 0, 0755); err != nil {
return err
}
for _, name := range []string{"null", "zero", "full", "random", "urandom", "tty"} {
if err := bindMount(
"/dev/"+name, path.Join(d.Path, name),
BindSource|BindDevices,
); err != nil {
return err
}
}
for i, name := range []string{"stdin", "stdout", "stderr"} {
if err := os.Symlink(
"/proc/self/fd/"+string(rune(i+'0')),
path.Join(target, name),
); err != nil {
return msg.WrapErr(err, err.Error())
}
}
for _, pair := range [][2]string{
{"/proc/self/fd", "fd"},
{"/proc/kcore", "core"},
{"pts/ptmx", "ptmx"},
} {
if err := os.Symlink(pair[0], path.Join(target, pair[1])); err != nil {
return msg.WrapErr(err, err.Error())
}
}
devPtsPath := path.Join(target, "pts")
for _, name := range []string{path.Join(target, "shm"), devPtsPath} {
if err := os.Mkdir(name, 0755); err != nil {
return msg.WrapErr(err, err.Error())
}
}
if err := syscall.Mount("devpts", devPtsPath, "devpts",
syscall.MS_NOSUID|syscall.MS_NOEXEC,
"newinstance,ptmxmode=0666,mode=620"); err != nil {
return wrapErrSuffix(err,
fmt.Sprintf("cannot mount devpts on %q:", devPtsPath))
}
if params.Flags&FAllowTTY != 0 {
var buf [8]byte
if _, _, errno := syscall.Syscall(
syscall.SYS_IOCTL, 1, syscall.TIOCGWINSZ,
uintptr(unsafe.Pointer(&buf[0])),
); errno == 0 {
if err := bindMount(
"/proc/self/fd/1", path.Join(d.Path, "console"),
BindDevices,
); err != nil {
return err
}
}
}
return nil
}
func (d *MountDev) Is(op Op) bool { vd, ok := op.(*MountDev); return ok && *d == *vd }
func (d *MountDev) String() string { return fmt.Sprintf("dev on %q", d.Path) }
func (f *Ops) Dev(dest string) *Ops {
*f = append(*f, &MountDev{dest})
return f
}
func (p *MountProc) Is(op Op) bool { vp, ok := op.(*MountProc); return ok && *p == *vp }
func (p *MountProc) String() string { return fmt.Sprintf("proc on %q", p.Path) }
func (f *Ops) Proc(dest string) *Ops {
*f = append(*f, &MountProc{dest})
return f
}
func init() { gob.Register(new(MountTmpfs)) }
// MountTmpfs mounts tmpfs on container Path.
type MountTmpfs struct {
Path string
Size int
Perm os.FileMode
}
func (t *MountTmpfs) apply(*InitParams) error {
if !path.IsAbs(t.Path) {
return msg.WrapErr(syscall.EBADE,
fmt.Sprintf("path %q is not absolute", t.Path))
}
if t.Size < 0 || t.Size > math.MaxUint>>1 {
return msg.WrapErr(syscall.EBADE,
fmt.Sprintf("size %d out of bounds", t.Size))
}
return mountTmpfs("tmpfs", t.Path, t.Size, t.Perm)
}
func (t *MountTmpfs) Is(op Op) bool { vt, ok := op.(*MountTmpfs); return ok && *t == *vt }
func (t *MountTmpfs) String() string { return fmt.Sprintf("tmpfs on %q size %d", t.Path, t.Size) }
func (f *Ops) Tmpfs(dest string, size int, perm os.FileMode) *Ops {
*f = append(*f, &MountTmpfs{dest, size, perm})
return f
}
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