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-rw-r--r--kernel/ns_cgroup.c14
1 files changed, 4 insertions, 10 deletions
diff --git a/kernel/ns_cgroup.c b/kernel/ns_cgroup.c
index 78bc3fd..5aa854f 100644
--- a/kernel/ns_cgroup.c
+++ b/kernel/ns_cgroup.c
@@ -34,7 +34,7 @@ int ns_cgroup_clone(struct task_struct *task, struct pid *pid)
/*
* Rules:
- * 1. you can only enter a cgroup which is a child of your current
+ * 1. you can only enter a cgroup which is a descendant of your current
* cgroup
* 2. you can only place another process into a cgroup if
* a. you have CAP_SYS_ADMIN
@@ -45,21 +45,15 @@ int ns_cgroup_clone(struct task_struct *task, struct pid *pid)
static int ns_can_attach(struct cgroup_subsys *ss,
struct cgroup *new_cgroup, struct task_struct *task)
{
- struct cgroup *orig;
-
if (current != task) {
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
- if (!cgroup_is_descendant(new_cgroup))
+ if (!cgroup_is_descendant(new_cgroup, current))
return -EPERM;
}
- if (atomic_read(&new_cgroup->count) != 0)
- return -EPERM;
-
- orig = task_cgroup(task, ns_subsys_id);
- if (orig && orig != new_cgroup->parent)
+ if (!cgroup_is_descendant(new_cgroup, task))
return -EPERM;
return 0;
@@ -77,7 +71,7 @@ static struct cgroup_subsys_state *ns_create(struct cgroup_subsys *ss,
if (!capable(CAP_SYS_ADMIN))
return ERR_PTR(-EPERM);
- if (!cgroup_is_descendant(cgroup))
+ if (!cgroup_is_descendant(cgroup, current))
return ERR_PTR(-EPERM);
ns_cgroup = kzalloc(sizeof(*ns_cgroup), GFP_KERNEL);
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