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uts: support ns lookup 

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

Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2025-09-12 13:52:48 +02:00
parent 2f5243cbba
commit 58f976d41f
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
1 changed files with 6 additions and 1 deletions
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7
kernel/utsname.c
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@ -13,6 +13,7 @@
#include <linux/cred.h>
#include <linux/user_namespace.h>
#include <linux/proc_ns.h>
#include <linux/nstree.h>
#include <linux/sched/task.h>
static struct kmem_cache *uts_ns_cache __ro_after_init;
@ -58,6 +59,7 @@ static struct uts_namespace *clone_uts_ns(struct user_namespace *user_ns,
memcpy(&ns->name, &old_ns->name, sizeof(ns->name));
ns->user_ns = get_user_ns(user_ns);
up_read(&uts_sem);
ns_tree_add(ns);
return ns;
fail_free:
@ -93,10 +95,12 @@ struct uts_namespace *copy_utsname(unsigned long flags,
void free_uts_ns(struct uts_namespace *ns)
{
ns_tree_remove(ns);
dec_uts_namespaces(ns->ucounts);
put_user_ns(ns->user_ns);
ns_free_inum(&ns->ns);
kmem_cache_free(uts_ns_cache, ns);
/* Concurrent nstree traversal depends on a grace period. */
kfree_rcu(ns, ns.ns_rcu);
}
static inline struct uts_namespace *to_uts_ns(struct ns_common *ns)
@ -162,4 +166,5 @@ void __init uts_ns_init(void)
offsetof(struct uts_namespace, name),
sizeof_field(struct uts_namespace, name),
NULL);
ns_tree_add(&init_uts_ns);
}