diff options
| author | Christian Brauner <brauner@kernel.org> | 2025-09-12 13:52:48 +0200 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2025-09-19 14:26:15 +0200 |
| commit | 58f976d41fd915acd2403a2b8e0eef8e9c478357 (patch) | |
| tree | d58ee5cef9395fe7abc83a874dd6aaa87eb6476d /kernel | |
| parent | 2f5243cbba6cff66cc8b43bdc14853282f5b1e67 (diff) | |
uts: support ns lookup
Support the generic ns lookup infrastructure to support file handles for
namespaces.
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/utsname.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/kernel/utsname.c b/kernel/utsname.c index 02037010b378..64155417ae0c 100644 --- a/kernel/utsname.c +++ b/kernel/utsname.c @@ -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); } |