linux-kernel - Re: [PATCH 1/1] cgroup-v1: Grant CAP_SYS_NICE holders permission to move tasks between cgroups

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Message-ID: <YMs08Ij8PZ/gemLL@slm.duckdns.org>
Date:   Thu, 17 Jun 2021 07:41:36 -0400
From:   Tejun Heo <tj@...nel.org>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     linux-kernel@...r.kernel.org, Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>, cgroups@...r.kernel.org
Subject: Re: [PATCH 1/1] cgroup-v1: Grant CAP_SYS_NICE holders permission to
 move tasks between cgroups

Hello,

On Thu, Jun 17, 2021 at 10:09:41AM +0100, Lee Jones wrote:
> It should be possible for processes with CAP_SYS_NICE capabilities
> (privileges) to move lower priority tasks within the same namespace to
> different cgroups.

I'm not sure that "should" is justified that easily given that cgroup can
affect things like device access permissions and basic system organization.

> One extremely common example of this is Android's 'system_server',
> which moves processes around to different cgroups/cpusets, but should
> not require any other root privileges.

Why is this being brought up now after all the years? Isn't android moving
onto cgroup2 anyway?

Thanks.

-- 
tejun