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time: support ns lookup

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

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2025-09-12 13:52:46 +02:00
parent 488acdcec8
commit b36c823b9a
No known key found for this signature in database
GPG key ID: 91C61BC06578DCA2
3 changed files with 17 additions and 1 deletions
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5
include/linux/time_namespace.h
View file

@ -33,6 +33,7 @@ struct time_namespace {
extern struct time_namespace init_time_ns; extern struct time_namespace init_time_ns;
#ifdef CONFIG_TIME_NS #ifdef CONFIG_TIME_NS
void __init time_ns_init(void);
extern int vdso_join_timens(struct task_struct *task, extern int vdso_join_timens(struct task_struct *task,
struct time_namespace *ns); struct time_namespace *ns);
extern void timens_commit(struct task_struct *tsk, struct time_namespace *ns); extern void timens_commit(struct task_struct *tsk, struct time_namespace *ns);
@ -108,6 +109,10 @@ static inline ktime_t timens_ktime_to_host(clockid_t clockid, ktime_t tim)
} }
#else #else
static inline void __init time_ns_init(void)
{
}
static inline int vdso_join_timens(struct task_struct *task, static inline int vdso_join_timens(struct task_struct *task,
struct time_namespace *ns) struct time_namespace *ns)
{ {

2
init/main.c
View file

@ -103,6 +103,7 @@
#include <linux/randomize_kstack.h> #include <linux/randomize_kstack.h>
#include <linux/pidfs.h> #include <linux/pidfs.h>
#include <linux/ptdump.h> #include <linux/ptdump.h>
#include <linux/time_namespace.h>
#include <net/net_namespace.h> #include <net/net_namespace.h>
#include <asm/io.h> #include <asm/io.h>
@ -1072,6 +1073,7 @@ void start_kernel(void)
fork_init(); fork_init();
proc_caches_init(); proc_caches_init();
uts_ns_init(); uts_ns_init();
time_ns_init();
key_init(); key_init();
security_init(); security_init();
dbg_late_init(); dbg_late_init();

11
kernel/time/namespace.c
View file

@ -12,6 +12,7 @@
#include <linux/seq_file.h> #include <linux/seq_file.h>
#include <linux/proc_ns.h> #include <linux/proc_ns.h>
#include <linux/export.h> #include <linux/export.h>
#include <linux/nstree.h>
#include <linux/time.h> #include <linux/time.h>
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/cred.h> #include <linux/cred.h>
@ -104,6 +105,7 @@ static struct time_namespace *clone_time_ns(struct user_namespace *user_ns,
ns->user_ns = get_user_ns(user_ns); ns->user_ns = get_user_ns(user_ns);
ns->offsets = old_ns->offsets; ns->offsets = old_ns->offsets;
ns->frozen_offsets = false; ns->frozen_offsets = false;
ns_tree_add(ns);
return ns; return ns;
fail_free_page: fail_free_page:
@ -250,11 +252,13 @@ static void timens_set_vvar_page(struct task_struct *task,
void free_time_ns(struct time_namespace *ns) void free_time_ns(struct time_namespace *ns)
{ {
ns_tree_remove(ns);
dec_time_namespaces(ns->ucounts); dec_time_namespaces(ns->ucounts);
put_user_ns(ns->user_ns); put_user_ns(ns->user_ns);
ns_free_inum(&ns->ns); ns_free_inum(&ns->ns);
__free_page(ns->vvar_page); __free_page(ns->vvar_page);
kfree(ns); /* Concurrent nstree traversal depends on a grace period. */
kfree_rcu(ns, ns.ns_rcu);
} }
static struct time_namespace *to_time_ns(struct ns_common *ns) static struct time_namespace *to_time_ns(struct ns_common *ns)
@ -487,3 +491,8 @@ struct time_namespace init_time_ns = {
.ns.ops = &timens_operations, .ns.ops = &timens_operations,
.frozen_offsets = true, .frozen_offsets = true,
}; };
void __init time_ns_init(void)
{
ns_tree_add(&init_time_ns);
}