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Diffstat (limited to 'kernel/cgroup.c')
-rw-r--r--kernel/cgroup.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index b2f203f25ec8..ad8eae5bb801 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -60,6 +60,7 @@
#include <linux/eventfd.h>
#include <linux/poll.h>
#include <linux/flex_array.h> /* used in cgroup_attach_proc */
+#include <linux/kthread.h>
#include <linux/atomic.h>
@@ -2225,6 +2226,18 @@ retry_find_task:
if (threadgroup)
tsk = tsk->group_leader;
+
+ /*
+ * Workqueue threads may acquire PF_THREAD_BOUND and become
+ * trapped in a cpuset, or RT worker may be born in a cgroup
+ * with no rt_runtime allocated. Just say no.
+ */
+ if (tsk == kthreadd_task || (tsk->flags & PF_THREAD_BOUND)) {
+ ret = -EINVAL;
+ rcu_read_unlock();
+ goto out_unlock_cgroup;
+ }
+
get_task_struct(tsk);
rcu_read_unlock();