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hotplug: netns aware uevent_helper 

It only makes sense for uevent_helper to get events
in the intial namespaces.  It's invocation is not
per namespace and it is not clear how we could make
it's invocation namespace aware.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Eric W. Biederman 2010-05-04 17:36:48 -07:00 committed by Greg Kroah-Hartman
parent 5f71a29629
commit 417daa1e8f
1 changed files with 17 additions and 2 deletions
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19
lib/kobject_uevent.c
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@ -19,7 +19,7 @@
#include <linux/kobject.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/user_namespace.h>
#include <linux/socket.h>
#include <linux/skbuff.h>
#include <linux/netlink.h>
@ -99,6 +99,21 @@ static int kobj_bcast_filter(struct sock *dsk, struct sk_buff *skb, void *data)
return 0;
}
static int kobj_usermode_filter(struct kobject *kobj)
{
const struct kobj_ns_type_operations *ops;
ops = kobj_ns_ops(kobj);
if (ops) {
const void *init_ns, *ns;
ns = kobj->ktype->namespace(kobj);
init_ns = ops->initial_ns();
return ns != init_ns;
}
return 0;
}
/**
* kobject_uevent_env - send an uevent with environmental data
*
@ -274,7 +289,7 @@ int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
#endif
/* call uevent_helper, usually only enabled during early boot */
if (uevent_helper[0]) {
if (uevent_helper[0] && !kobj_usermode_filter(kobj)) {
char *argv [3];
argv [0] = uevent_helper;