From: Christian Brauner <brauner@kernel.org>
Date: Fri, 12 Sep 2025 11:52:45 +0000 (+0200)
Subject: pid: support ns lookup
X-Git-Tag: v6.18-rc1~232^2~6^2~11
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=488acdcec8e24377506934a95e0ba21619073e8f;p=thirdparty%2Flinux.git

pid: support ns lookup

Support the generic ns lookup infrastructure to support file handles for
namespaces.

Signed-off-by: Christian Brauner <brauner@kernel.org>
---

diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index 20ce4052d1c51..228ae20299f9a 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -23,6 +23,7 @@
 #include <linux/sched/task.h>
 #include <linux/sched/signal.h>
 #include <linux/idr.h>
+#include <linux/nstree.h>
 #include <uapi/linux/wait.h>
 #include "pid_sysctl.h"
 
@@ -122,6 +123,7 @@ static struct pid_namespace *create_pid_namespace(struct user_namespace *user_ns
 	ns->memfd_noexec_scope = pidns_memfd_noexec_scope(parent_pid_ns);
 #endif
 
+	ns_tree_add(ns);
 	return ns;
 
 out_free_inum:
@@ -147,6 +149,7 @@ static void delayed_free_pidns(struct rcu_head *p)
 
 static void destroy_pid_namespace(struct pid_namespace *ns)
 {
+	ns_tree_remove(ns);
 	unregister_pidns_sysctls(ns);
 
 	ns_free_inum(&ns->ns);
@@ -473,6 +476,7 @@ static __init int pid_namespaces_init(void)
 #endif
 
 	register_pid_ns_sysctl_table_vm();
+	ns_tree_add(&init_pid_ns);
 	return 0;
 }