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Diffstat (limited to 'kernel/utsname.c')
-rw-r--r--kernel/utsname.c20
1 files changed, 16 insertions, 4 deletions
diff --git a/kernel/utsname.c b/kernel/utsname.c
index 913fe4336d2b..dcd6be1996fe 100644
--- a/kernel/utsname.c
+++ b/kernel/utsname.c
@@ -19,6 +19,8 @@
#include <linux/proc_ns.h>
#include <linux/sched/task.h>
+static struct kmem_cache *uts_ns_cache __ro_after_init;
+
static struct ucounts *inc_uts_namespaces(struct user_namespace *ns)
{
return inc_ucount(ns, current_euid(), UCOUNT_UTS_NAMESPACES);
@@ -33,7 +35,7 @@ static struct uts_namespace *create_uts_ns(void)
{
struct uts_namespace *uts_ns;
- uts_ns = kmalloc(sizeof(struct uts_namespace), GFP_KERNEL);
+ uts_ns = kmem_cache_alloc(uts_ns_cache, GFP_KERNEL);
if (uts_ns)
kref_init(&uts_ns->kref);
return uts_ns;
@@ -42,7 +44,7 @@ static struct uts_namespace *create_uts_ns(void)
/*
* Clone a new ns copying an original utsname, setting refcount to 1
* @old_ns: namespace to clone
- * Return ERR_PTR(-ENOMEM) on error (failure to kmalloc), new ns otherwise
+ * Return ERR_PTR(-ENOMEM) on error (failure to allocate), new ns otherwise
*/
static struct uts_namespace *clone_uts_ns(struct user_namespace *user_ns,
struct uts_namespace *old_ns)
@@ -75,7 +77,7 @@ static struct uts_namespace *clone_uts_ns(struct user_namespace *user_ns,
return ns;
fail_free:
- kfree(ns);
+ kmem_cache_free(uts_ns_cache, ns);
fail_dec:
dec_uts_namespaces(ucounts);
fail:
@@ -113,7 +115,7 @@ void free_uts_ns(struct kref *kref)
dec_uts_namespaces(ns->ucounts);
put_user_ns(ns->user_ns);
ns_free_inum(&ns->ns);
- kfree(ns);
+ kmem_cache_free(uts_ns_cache, ns);
}
static inline struct uts_namespace *to_uts_ns(struct ns_common *ns)
@@ -169,3 +171,13 @@ const struct proc_ns_operations utsns_operations = {
.install = utsns_install,
.owner = utsns_owner,
};
+
+void __init uts_ns_init(void)
+{
+ uts_ns_cache = kmem_cache_create_usercopy(
+ "uts_namespace", sizeof(struct uts_namespace), 0,
+ SLAB_PANIC|SLAB_ACCOUNT,
+ offsetof(struct uts_namespace, name),
+ sizeof_field(struct uts_namespace, name),
+ NULL);
+}