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pid_ns: Move parent pid_ns's helper check to create_pid_ns_helper()

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It's impossible to create a task from a pid_ns if its helper
is not created, because we wait in wait_pid_ns_helper_prepared()
for that. So, such situation here is a bug.
Move the wait and convert it to BUG().

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
This commit is contained in:
Kirill Tkhai
2017-05-16 19:26:47 +03:00
committed by Andrei Vagin
parent 56719a3e52
commit e31ad5f195
1 changed files with 1 additions and 6 deletions
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7
criu/namespaces.c
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@@ -2645,12 +2645,6 @@ static int do_create_pid_ns_helper(void *arg, int sk, pid_t unused_pid)
goto err;
}
tmp = ns->parent;
if (tmp) {
futex_t *f = &tmp->pid.helper_created;
futex_wait_while_eq(f, 0);
}
if (switch_ns(root_item->pid->real, &mnt_ns_desc, &mnt_ns_fd) < 0) {
pr_err("Can't set mnt_ns\n");
goto err;
@@ -2730,6 +2724,7 @@ int create_pid_ns_helper(struct ns_id *ns)
int sk;
BUG_ON(getpid() != INIT_PID);
BUG_ON(ns->parent && !futex_get(&ns->parent->pid.helper_created));
if (__set_next_pid(ns->ns_pid) < 0) {
pr_err("Can't set next fd\n");