[PATCH 1/1] device_cgroup: remove can_attach

[Serge Hallyn]

It is really only wanting to duplicate a check which is already done by the
cgroup subsystem.

With this patch, user jdoe still cannot move pid 1 into a devices cgroup
he owns, but now he can move his own other tasks into devices cgroups.

Signed-off-by: Serge Hallyn <serge.hallyn@xxxxxxxxxx>
Cc: Aristeu Rozanski <aris@xxxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
---
 security/device_cgroup.c | 11 -----------
 1 file changed, 11 deletions(-)

diff --git a/security/device_cgroup.c b/security/device_cgroup.c
index efc6f68..a37c054 100644
--- a/security/device_cgroup.c
+++ b/security/device_cgroup.c
@@ -64,16 +64,6 @@ static inline struct dev_cgroup *task_devcgroup(struct task_struct *task)
 
 struct cgroup_subsys devices_subsys;
 
-static int devcgroup_can_attach(struct cgroup_subsys_state *new_css,
-				struct cgroup_taskset *set)
-{
-	struct task_struct *task = cgroup_taskset_first(set);
-
-	if (current != task && !capable(CAP_SYS_ADMIN))
-		return -EPERM;
-	return 0;
-}
-
 /*
  * called under devcgroup_mutex
  */
@@ -698,7 +688,6 @@ static struct cftype dev_cgroup_files[] = {
 
 struct cgroup_subsys devices_subsys = {
 	.name = "devices",
-	.can_attach = devcgroup_can_attach,
 	.css_alloc = devcgroup_css_alloc,
 	.css_free = devcgroup_css_free,
 	.css_online = devcgroup_online,
-- 
1.8.3.2

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