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driver core: set up ownership of class devices in sysfs

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Plumb in get_ownership() callback for devices belonging to a class so that
they can be created with uid/gid different from global root. This will
allow network devices in a container to belong to container's root and not
global root.

Signed-off-by: Dmitry Torokhov <[email protected]>
Reviewed-by: Tyler Hicks <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Dmitry Torokhov 2018-07-20 21:56:50 +00:00 • committed by David S. Miller
commit 9944e894c1
2 changed files with 14 additions and 0 deletions
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9
drivers/base/core.c
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@ -866,10 +866,19 @@ static const void *device_namespace(struct kobject *kobj)
return ns;
}
static void device_get_ownership(struct kobject *kobj, kuid_t *uid, kgid_t *gid)
{
struct device *dev = kobj_to_dev(kobj);
if (dev->class && dev->class->get_ownership)
dev->class->get_ownership(dev, uid, gid);
}
static struct kobj_type device_ktype = {
.release = device_release,
.sysfs_ops = &dev_sysfs_ops,
.namespace = device_namespace,
.get_ownership = device_get_ownership,
};