linux-kernel - Re: [PATCH 1/3] cpuset: Allow setscheduler regardless of manipulated task

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Message-ID: <qmxqf4cnt4ajt7y43vmy7xjf7mgljnq4gxqkiqdmaadrcq4lfx@f4kxwy5wygvm>
Date:   Fri, 30 Jun 2023 20:42:51 +0200
From:   Michal Koutný <mkoutny@...e.com>
To:     Waiman Long <longman@...hat.com>
Cc:     linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
        linux-kselftest@...r.kernel.org,
        Zefan Li <lizefan.x@...edance.com>, Tejun Heo <tj@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Shuah Khan <shuah@...nel.org>
Subject: Re: [PATCH 1/3] cpuset: Allow setscheduler regardless of manipulated
 task

On Thu, Jun 29, 2023 at 08:11:33AM -0400, Waiman Long <longman@...hat.com> wrote:
> Another fact about cpuset controller enabling is that both cpus_allowed and
> mems_allowed are empty at that point. You may also add these checks as a
> preconditions for disabling the security_task_setscheduler check.

I considered relying on that, however, there is more generic case when
migrating between two sibling that should be allowed in v2 too.
See the added test_cpuset_perms_object(). (Admittedly, it doesn't stress
the case when the two siblings had different CPUs but it could.)

Anyway, let's move on to v2 (where I addressed remaining comments).

Thanks,
Michal

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