| From | Valentin Schneider <> | Subject | [PATCH 1/2] sched: Deny self-issued __set_cpus_allowed_ptr() when migrate_disable() | Date | Tue, 13 Oct 2020 15:01:15 +0100 |
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migrate_disable(); set_cpus_allowed_ptr(current, {something excluding task_cpu(current)}); affine_move_task(); <-- never returns
Signed-off-by: Valentin Schneider <valentin.schneider@arm.com> --- kernel/sched/core.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 4ccd1099adaa..7f4e38819de1 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -2189,6 +2189,11 @@ static int __set_cpus_allowed_ptr(struct task_struct *p, if (!(flags & SCA_MIGRATE_ENABLE) && cpumask_equal(&p->cpus_mask, new_mask)) goto out; + if (p == current && + is_migration_disabled(p) && + !cpumask_test_cpu(task_cpu(p), new_mask)) + ret = -EBUSY; + /* * Picking a ~random cpu helps in cases where we are changing affinity * for groups of tasks (ie. cpuset), so that load balancing is not -- 2.27.0
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