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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 <[email protected]>
Cc: Paul Menage <[email protected]>
Cc: Paul Jackson <[email protected]>
Signed-off-by: David Rientjes <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
David Rientjes 2008-06-05 12:57:11 -07:00 • committed by Ingo Molnar
commit 9985b0bab3
4 changed files with 21 additions and 1 deletions
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14
kernel/cpuset.c
View file

@ -1190,6 +1190,15 @@ static int cpuset_can_attach(struct cgroup_subsys *ss,
if (cpus_empty(cs->cpus_allowed) || nodes_empty(cs->mems_allowed))
return -ENOSPC;
if (tsk->flags & PF_THREAD_BOUND) {
cpumask_t mask;
mutex_lock(&callback_mutex);
mask = cs->cpus_allowed;
mutex_unlock(&callback_mutex);
if (!cpus_equal(tsk->cpus_allowed, mask))
return -EINVAL;
}
return security_task_setscheduler(tsk, 0, NULL);
}
@ -1203,11 +1212,14 @@ static void cpuset_attach(struct cgroup_subsys *ss,
struct mm_struct *mm;
struct cpuset *cs = cgroup_cs(cont);
struct cpuset *oldcs = cgroup_cs(oldcont);
int err;
mutex_lock(&callback_mutex);
guarantee_online_cpus(cs, &cpus);
set_cpus_allowed_ptr(tsk, &cpus);
err = set_cpus_allowed_ptr(tsk, &cpus);
mutex_unlock(&callback_mutex);
if (err)
return;
from = oldcs->mems_allowed;
to = cs->mems_allowed;