Hello,
On Thu, Dec 13, 2018 at 03:17:37PM +0100, Ondrej Mosnacek wrote:
> This fixes the case where all mount options specified are consumed by an
> LSM and all that's left is an empty string. In this case cgroupfs should
> accept the string and not fail.
>
> How to reproduce (with SELinux enabled):
>
> # umount /sys/fs/cgroup/unified
> # mount -o context=system_u:object_r:cgroup_t:s0 -t cgroup2 cgroup2 /sys/fs/cgroup/unified
> mount: /sys/fs/cgroup/unified: wrong fs type, bad option, bad superblock on cgroup2, missing codepage or helper program, or other error.
> # dmesg | tail -n 1
> [ 31.575952] cgroup: cgroup2: unknown option ""
>
> Fixes: 67e9c74b8a87 ("cgroup: replace __DEVEL__sane_behavior with cgroup2 fs type")
> [NOTE: should apply on top of commit 5136f6365ce3 ("cgroup: implement "nsdelegate" mount option"), older versions need manual rebase]
> Suggested-by: Stephen Smalley <sds@xxxxxxxxxxxxx>
> Signed-off-by: Ondrej Mosnacek <omosnace@xxxxxxxxxx>
Applied to cgroup/for-4.21.
Thanks.
--
tejun
