Tejun Heo d1897c9538 cgroup: fix rule checking for threaded mode switching ... 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+		2018-02-21 11:39:22 -08:00
..
cgroup-internal.h	Merge branch 'for-4.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2017-11-15 14:29:44 -08:00
cgroup-v1.c	cgroup: Fix deadlock in cpu hotplug path	2017-12-19 05:38:47 -08:00
cgroup.c	cgroup: fix rule checking for threaded mode switching	2018-02-21 11:39:22 -08:00
cpuset.c	kernel/cpuset: current_cpuset_is_being_rebound can be boolean	2018-02-06 18:32:47 -08:00
debug.c	debug cgroup: use task_css_set instead of rcu_dereference	2017-11-27 11:37:33 -08:00
freezer.c
Makefile	Merge branch 'for-4.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2017-11-15 14:29:44 -08:00
namespace.c
pids.c
rdma.c
stat.c	cgroup: properly init u64_stats	2017-11-28 07:16:08 -08:00