mirror of https://github.com/k3s-io/k3s
89 lines
2.6 KiB
Go
89 lines
2.6 KiB
Go
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// +build linux
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package libcontainer
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import (
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"fmt"
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"os"
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"runtime"
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"github.com/opencontainers/runc/libcontainer/apparmor"
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"github.com/opencontainers/runc/libcontainer/keys"
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"github.com/opencontainers/runc/libcontainer/seccomp"
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"github.com/opencontainers/runc/libcontainer/system"
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"github.com/opencontainers/selinux/go-selinux/label"
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"github.com/pkg/errors"
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"golang.org/x/sys/unix"
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)
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// linuxSetnsInit performs the container's initialization for running a new process
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// inside an existing container.
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type linuxSetnsInit struct {
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pipe *os.File
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consoleSocket *os.File
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config *initConfig
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}
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func (l *linuxSetnsInit) getSessionRingName() string {
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return fmt.Sprintf("_ses.%s", l.config.ContainerId)
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}
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func (l *linuxSetnsInit) Init() error {
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runtime.LockOSThread()
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defer runtime.UnlockOSThread()
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if !l.config.Config.NoNewKeyring {
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// Do not inherit the parent's session keyring.
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if _, err := keys.JoinSessionKeyring(l.getSessionRingName()); err != nil {
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// Same justification as in standart_init_linux.go as to why we
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// don't bail on ENOSYS.
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//
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// TODO(cyphar): And we should have logging here too.
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if errors.Cause(err) != unix.ENOSYS {
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return errors.Wrap(err, "join session keyring")
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}
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}
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}
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if l.config.CreateConsole {
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if err := setupConsole(l.consoleSocket, l.config, false); err != nil {
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return err
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}
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if err := system.Setctty(); err != nil {
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return err
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}
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}
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if l.config.NoNewPrivileges {
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if err := unix.Prctl(unix.PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); err != nil {
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return err
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}
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}
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if err := label.SetProcessLabel(l.config.ProcessLabel); err != nil {
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return err
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}
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defer label.SetProcessLabel("")
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// Without NoNewPrivileges seccomp is a privileged operation, so we need to
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// do this before dropping capabilities; otherwise do it as late as possible
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// just before execve so as few syscalls take place after it as possible.
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if l.config.Config.Seccomp != nil && !l.config.NoNewPrivileges {
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if err := seccomp.InitSeccomp(l.config.Config.Seccomp); err != nil {
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return err
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}
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}
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if err := finalizeNamespace(l.config); err != nil {
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return err
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}
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if err := apparmor.ApplyProfile(l.config.AppArmorProfile); err != nil {
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return err
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}
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// Set seccomp as close to execve as possible, so as few syscalls take
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// place afterward (reducing the amount of syscalls that users need to
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// enable in their seccomp profiles).
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if l.config.Config.Seccomp != nil && l.config.NoNewPrivileges {
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if err := seccomp.InitSeccomp(l.config.Config.Seccomp); err != nil {
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return newSystemErrorWithCause(err, "init seccomp")
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}
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}
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return system.Execv(l.config.Args[0], l.config.Args[0:], os.Environ())
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}
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