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sysfs, kobject: allow creating kobject belonging to arbitrary users

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Normally kobjects and their sysfs representation belong to global root,
however it is not necessarily the case for objects in separate namespaces.
For example, objects in separate network namespace logically belong to the
container's root and not global root.

This change lays groundwork for allowing network namespace objects
ownership to be transferred to container's root user by defining
get_ownership() callback in ktype structure and using it in sysfs code to
retrieve desired uid/gid when creating sysfs objects for given kobject.

Co-Developed-by: Tyler Hicks <tyhicks@canonical.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dmitry Torokhov 2018-07-20 21:56:48 +00:00 • committed by David S. Miller
parent 488dee96bb
commit 5f81880d52
6 changed files with 67 additions and 23 deletions
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4
include/linux/kobject.h
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@ -26,6 +26,7 @@
#include <linux/wait.h>
#include <linux/atomic.h>
#include <linux/workqueue.h>
#include <linux/uidgid.h>
#define UEVENT_HELPER_PATH_LEN 256
#define UEVENT_NUM_ENVP 32 /* number of env pointers */
@ -114,6 +115,8 @@ extern struct kobject * __must_check kobject_get_unless_zero(
extern void kobject_put(struct kobject *kobj);
extern const void *kobject_namespace(struct kobject *kobj);
extern void kobject_get_ownership(struct kobject *kobj,
kuid_t *uid, kgid_t *gid);
extern char *kobject_get_path(struct kobject *kobj, gfp_t flag);
struct kobj_type {
@ -122,6 +125,7 @@ struct kobj_type {
struct attribute **default_attrs;
const struct kobj_ns_type_operations *(*child_ns_type)(struct kobject *kobj);
const void *(*namespace)(struct kobject *kobj);
void (*get_ownership)(struct kobject *kobj, kuid_t *uid, kgid_t *gid);
};
struct kobj_uevent_env {