Re: [PATCH v3] cgroup-v1: add disabled controller check in cgroup1_parse_param()

[Tejun Heo]

On Fri, Jan 15, 2021 at 05:37:17PM +0800, Chen Zhou wrote:
> When mounting a cgroup hierarchy with disabled controller in cgroup v1,
> all available controllers will be attached.
> For example, boot with cgroup_no_v1=cpu or cgroup_disable=cpu, and then
> mount with "mount -t cgroup -ocpu cpu /sys/fs/cgroup/cpu", then all
> enabled controllers will be attached except cpu.
> 
> Fix this by adding disabled controller check in cgroup1_parse_param().
> If the specified controller is disabled, just return error with information
> "Disabled controller xx" rather than attaching all the other enabled
> controllers.
> 
> Fixes: f5dfb5315d34 ("cgroup: take options parsing into ->parse_monolithic()")
> Signed-off-by: Chen Zhou <chenzhou10@xxxxxxxxxx>
> Reviewed-by: Zefan Li <lizefan.x@xxxxxxxxxxxxx>

Applied to cgroup/for-5.11-fixes.

Thanks.

-- 
tejun