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tty: allow TIOCSLCKTRMIOS with CAP_CHECKPOINT_RESTORE

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The capability CAP_CHECKPOINT_RESTORE was introduced to allow non-root
users to checkpoint and restore processes as non-root with CRIU.

This change extends CAP_CHECKPOINT_RESTORE to enable the CRIU option
'--shell-job' as non-root. CRIU's man-page describes the '--shell-job'
option like this:

  Allow one to dump shell jobs. This implies the restored task will
  inherit session and process group ID from the criu itself. This option
  also allows to migrate a single external tty connection, to migrate
  applications like top.

TIOCSLCKTRMIOS can only be done if the process has CAP_SYS_ADMIN and
this change extends it to CAP_SYS_ADMIN or CAP_CHECKPOINT_RESTORE.

With this change it is possible to checkpoint and restore processes
which have a tty connection as non-root if CAP_CHECKPOINT_RESTORE is
set.

Acked-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Adrian Reber <areber@redhat.com>
Acked-by: Andrei Vagin <avagin@gmail.com>
Link: https://lore.kernel.org/r/20231208143656.1019-1-areber@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Adrian Reber 2023-12-08 15:36:56 +01:00 committed by Greg Kroah-Hartman
parent 3d19ff562d
commit e0f25b8992
1 changed files with 2 additions and 2 deletions
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4
drivers/tty/tty_ioctl.c
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@ -844,7 +844,7 @@ int tty_mode_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg)
ret = -EFAULT;
return ret;
case TIOCSLCKTRMIOS:
if (!capable(CAP_SYS_ADMIN))
if (!checkpoint_restore_ns_capable(&init_user_ns))
return -EPERM;
copy_termios_locked(real_tty, &kterm);
if (user_termios_to_kernel_termios(&kterm,
@ -861,7 +861,7 @@ int tty_mode_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg)
ret = -EFAULT;
return ret;
case TIOCSLCKTRMIOS:
if (!capable(CAP_SYS_ADMIN))
if (!checkpoint_restore_ns_capable(&init_user_ns))
return -EPERM;
copy_termios_locked(real_tty, &kterm);
if (user_termios_to_kernel_termios_1(&kterm,