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UPSTREAM: sched/psi: Do not require setsched permission from the trigger creator

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When a process creates a new trigger by writing into /proc/pressure/*
files, permissions to write such a file should be used to determine whether
the process is allowed to do so or not. Current implementation would also
require such a process to have setsched capability. Setting of psi trigger
thread's scheduling policy is an implementation detail and should not be
exposed to the user level. Remove the permission check by using _nocheck
version of the function.

Suggested-by: Nick Kralevich <nnk@google.com>
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: lizefan@huawei.com
Cc: mingo@redhat.com
Cc: akpm@linux-foundation.org
Cc: kernel-team@android.com
Cc: dennisszhou@gmail.com
Cc: dennis@kernel.org
Cc: hannes@cmpxchg.org
Cc: axboe@kernel.dk
Link: https://lkml.kernel.org/r/20190730013310.162367-1-surenb@google.com

(cherry picked from commit 04e048cf09)

Bug: 131761776
Test: lmkd_unit_test and ACT mempressure tests
Change-Id: I37737e85611bb742d61a6988132856726bef9a1f
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
This commit is contained in:
Suren Baghdasaryan
2019-07-29 18:33:10 -07:00
parent 2a220bc9f2
commit 849205758a
1 changed files with 1 additions and 1 deletions
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kernel/sched/psi.c
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@@ -1061,7 +1061,7 @@ struct psi_trigger *psi_trigger_create(struct psi_group *group,
mutex_unlock(&group->trigger_lock);
return ERR_CAST(kworker);
}
sched_setscheduler(kworker->task, SCHED_FIFO, &param);
sched_setscheduler_nocheck(kworker->task, SCHED_FIFO, &param);
kthread_init_delayed_work(&group->poll_work,
psi_poll_work);
rcu_assign_pointer(group->poll_kworker, kworker);