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restore: Move kids (and session) restore into a helper

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Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Pavel Emelyanov
2013-08-11 20:15:43 +04:00
parent 26aa61a344
commit ede980c077
1 changed files with 40 additions and 23 deletions
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63
cr-restore.c
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@@ -1078,10 +1078,47 @@ static int mount_proc(void)
return ret;
}
/*
* Tasks cannot change sid (session id) arbitrary, but can either
* inherit one from ancestor, or create a new one with id equal to
* their pid. Thus sid-s restore is tied with children creation.
*/
static int create_children_and_session(void)
{
int ret;
struct pstree_item *child;
pr_info("Restoring children in alien sessions:\n");
list_for_each_entry(child, &current->children, sibling) {
if (!restore_before_setsid(child))
continue;
BUG_ON(child->born_sid != -1 && getsid(getpid()) != child->born_sid);
ret = fork_with_pid(child);
if (ret < 0)
return ret;
}
restore_sid();
pr_info("Restoring children in our session:\n");
list_for_each_entry(child, &current->children, sibling) {
if (restore_before_setsid(child))
continue;
ret = fork_with_pid(child);
if (ret < 0)
return ret;
}
return 0;
}
static int restore_task_with_children(void *_arg)
{
struct cr_clone_arg *ca = _arg;
struct pstree_item *child;
pid_t pid;
int ret;
sigset_t blockmask;
@@ -1151,28 +1188,8 @@ static int restore_task_with_children(void *_arg)
exit(1);
}
pr_info("Restoring children:\n");
list_for_each_entry(child, &current->children, sibling) {
if (!restore_before_setsid(child))
continue;
BUG_ON(child->born_sid != -1 && getsid(getpid()) != child->born_sid);
ret = fork_with_pid(child);
if (ret < 0)
exit(1);
}
restore_sid();
pr_info("Restoring children:\n");
list_for_each_entry(child, &current->children, sibling) {
if (restore_before_setsid(child))
continue;
ret = fork_with_pid(child);
if (ret < 0)
exit(1);
}
if (create_children_and_session())
exit(1);
if (current->pgid == current->pid.virt)
restore_pgid();