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sched: prevent bound kthreads from changing cpus_allowed

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Kthreads that have called kthread_bind() are bound to specific cpus, so
other tasks should not be able to change their cpus_allowed from under
them.  Otherwise, it is possible to move kthreads, such as the migration
or software watchdog threads, so they are not allowed access to the cpu
they work on.

Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Paul Menage <menage@google.com>
Cc: Paul Jackson <pj@sgi.com>
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
David Rientjes
2008-06-05 12:57:11 -07:00
committed by Ingo Molnar
parent 7def2be1dc
commit 9985b0bab3
4 changed files with 21 additions and 1 deletions
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6
kernel/sched.c
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@@ -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 {