Tejun Heo aa0533f4f7 cgroup: fix rule checking for threaded mode switching ... commit d1897c9538 upstream. A domain cgroup isn't allowed to be turned threaded if its subtree is populated or domain controllers are enabled. cgroup_enable_threaded() depended on cgroup_can_be_thread_root() test to enforce this rule. A parent which has populated domain descendants or have domain controllers enabled can't become a thread root, so the above rules are enforced automatically. However, for the root cgroup which can host mixed domain and threaded children, cgroup_can_be_thread_root() doesn't check any of those conditions and thus first level cgroups ends up escaping those rules. This patch fixes the bug by adding explicit checks for those rules in cgroup_enable_threaded(). Reported-by: Michael Kerrisk (man-pages) <mtk.manpages@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org> Fixes: 8cfd8147df ("cgroup: implement cgroup v2 thread support") Cc: stable@vger.kernel.org # v4.14+ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2018-03-28 18:24:37 +02:00
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Makefile	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
cgroup-internal.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
cgroup-v1.c	cgroup: Fix deadlock in cpu hotplug path	2018-03-03 10:24:26 +01:00
cgroup.c	cgroup: fix rule checking for threaded mode switching	2018-03-28 18:24:37 +02:00
cpuset.c	Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2017-09-12 11:30:56 -07:00
debug.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
freezer.c	cgroup: add @flags to css_task_iter_start() and implement CSS_TASK_ITER_PROCS	2017-07-21 11:14:51 -04:00
namespace.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
pids.c	cgroup: implement cgroup v2 thread support	2017-07-21 11:14:51 -04:00
rdma.c	rdmacg: Fixed uninitialized current resource usage	2017-01-10 12:52:32 -05:00