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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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5
fs/sysfs/sysfs.h
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@@ -27,11 +27,10 @@ void sysfs_warn_dup(struct kernfs_node *parent, const char *name);
/*
* file.c
*/
int sysfs_add_file(struct kernfs_node *parent,
const struct attribute *attr, bool is_bin);
int sysfs_add_file_mode_ns(struct kernfs_node *parent,
const struct attribute *attr, bool is_bin,
umode_t amode, const void *ns);
umode_t amode, kuid_t uid, kgid_t gid,
const void *ns);
/*
* symlink.c