stable inclusion
from stable-v5.10.44
commit 74d3b20b1b206a76f2cbccc5e09106adf6b5775c
bugzilla: https://bugzilla.openeuler.org/show_bug.cgi?id=415
CVE: NA

-------------------------------------------------

commit b7e24eb1 upstream.

cgroup_mkdir() have restriction on newline usage in names:
$ mkdir $'/sys/fs/cgroup/cpu/test\ntest2'
mkdir: cannot create directory
'/sys/fs/cgroup/cpu/test\ntest2': Invalid argument

But in cgroup1_rename() such check is missed.
This allows us to make /proc/<pid>/cgroup unparsable:
$ mkdir /sys/fs/cgroup/cpu/test
$ mv /sys/fs/cgroup/cpu/test $'/sys/fs/cgroup/cpu/test\ntest2'
$ echo $$ > $'/sys/fs/cgroup/cpu/test\ntest2'
$ cat /proc/self/cgroup
11:pids:/
10:freezer:/
9:hugetlb:/
8:cpuset:/
7:blkio:/user.slice
6:memory:/user.slice
5:net_cls,net_prio:/
4:perf_event:/
3:devices:/user.slice
2:cpu,cpuacct:/test
test2
1:name=systemd:/
0::/
Signed-off-by: NAlexander Kuznetsov <wwfq@yandex-team.ru>
Reported-by: NAndrey Krasichkov <buglloc@yandex-team.ru>
Acked-by: NDmitry Yakunin <zeil@yandex-team.ru>
Cc: stable@vger.kernel.org
Signed-off-by: NTejun Heo <tj@kernel.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Nyinzixiang <yinzixiang1231@163.com>
Reviewed-by: Jian Cheng <cj.chengjian(a)huawei.com>
Signed-off-by: NWang ShaoBo <bobo.shaobowang@huawei.com>