sched: prevent bound kthreads from changing cpus_allowed

[karo-tx-linux.git] / kernel / sched.c

diff --git a/kernel/sched.c b/kernel/sched.c
index e9c24a1286557dfbe99cd58ce0e4668370e252a2..164fe7fe0d891615ffbcc680c9a8c439a9a14b54 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -5563,6 +5563,12 @@ int set_cpus_allowed_ptr(struct task_struct *p, const cpumask_t *new_mask)
                goto out;
        }
 
+       if (unlikely((p->flags & PF_THREAD_BOUND) && p != current &&
+                    !cpus_equal(p->cpus_allowed, *new_mask))) {
+               ret = -EINVAL;
+               goto out;
+       }
+
        if (p->sched_class->set_cpus_allowed)
                p->sched_class->set_cpus_allowed(p, new_mask);
        else {