| Subject | [PATCH 17/23] pid: Add pid namespaces into ns_idr | From | Kirill Tkhai <> | Date | Thu, 30 Jul 2020 15:00:51 +0300 |
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Now they are exposed in /proc/namespace/ directory.
Note, that we already wait RCU grace period before pid namespace's memory is freed.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com> --- kernel/pid_namespace.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c index da8490390f51..06398a7c4c59 100644 --- a/kernel/pid_namespace.c +++ b/kernel/pid_namespace.c @@ -109,8 +109,13 @@ static struct pid_namespace *create_pid_namespace(struct user_namespace *user_ns ns->ucounts = ucounts; ns->pid_allocated = PIDNS_ADDING; + if (ns_idr_register(&ns->ns) < 0) + goto out_free_inum; + return ns; +out_free_inum: + ns_free_inum(&ns->ns); out_free_idr: idr_destroy(&ns->idr); kmem_cache_free(pid_ns_cachep, ns); @@ -132,6 +137,7 @@ static void delayed_free_pidns(struct rcu_head *p) static void destroy_pid_namespace(struct pid_namespace *ns) { + ns_idr_unregister(&ns->ns); ns_free_inum(&ns->ns); idr_destroy(&ns->idr); @@ -466,6 +472,7 @@ static __init int pid_namespaces_init(void) #ifdef CONFIG_CHECKPOINT_RESTORE register_sysctl_paths(kern_path, pid_ns_ctl_table); #endif + WARN_ON(ns_idr_register(&init_pid_ns.ns) < 0); return 0; }
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