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Waiman Long f06c9b0154 cgroup/cpuset: Fix partition root's cpuset.cpus update bug

commit 292fd843de upstream.

It was found that commit 7a2127e66a ("cpuset: Call
set_cpus_allowed_ptr() with appropriate mask for task") introduced a bug
that corrupted "cpuset.cpus" of a partition root when it was updated.

It is because the tmp->new_cpus field of the passed tmp parameter
of update_parent_subparts_cpumask() should not be used at all as
it contains important cpumask data that should not be overwritten.
Fix it by using tmp->addmask instead.

Also update update_cpumask() to make sure that trialcs->cpu_allowed
will not be corrupted until it is no longer needed.

Fixes: 7a2127e66a ("cpuset: Call set_cpus_allowed_ptr() with appropriate mask for task")
Signed-off-by: Waiman Long <longman@redhat.com>
Cc: stable@vger.kernel.org # v6.2+
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2023-04-20 12:35:13 +02:00

cgroup-internal.h

memcg: Fix possible use-after-free in memcg_write_event_control()

2022-12-08 10:40:58 -08:00

cgroup-v1.c

cgroup: Use cgroup_attach_{lock,unlock}() from cgroup_attach_task_all()

2022-08-26 11:14:34 -10:00

cgroup.c

Merge tag 'cgroup-for-6.1-rc1-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

2022-10-17 18:52:43 -07:00

cpuset.c

cgroup/cpuset: Fix partition root's cpuset.cpus update bug