Commit 532de3fc authored Feb 13, 2014 by Tejun Heo

cgroup: update cgroup_enable_task_cg_lists() to grab siglock



Currently, there's nothing preventing cgroup_enable_task_cg_lists()
from missing set PF_EXITING and race against cgroup_exit().  Depending
on the timing, cgroup_exit() may finish with the task still linked on
css_set leading to list corruption.  Fix it by grabbing siglock in
cgroup_enable_task_cg_lists() so that PF_EXITING is guaranteed to be
visible.

This whole on-demand cg_list optimization is extremely fragile and has
ample possibility to lead to bugs which can cause things like
once-a-year oops during boot.  I'm wondering whether the better
approach would be just adding "cgroup_disable=all" handling which
disables the whole cgroup rather than tempting fate with this
on-demand craziness.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
Cc: stable@vger.kernel.org

parent 1a11533f

kernel/cgroup.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -2905,9 +2905,14 @@ static void cgroup_enable_task_cg_lists(void)
		* We should check if the process is exiting, otherwise
		* it will race with cgroup_exit() in that the list
		* entry won't be deleted though the process has exited.
		* Do it while holding siglock so that we don't end up
		* racing against cgroup_exit().
		*/
		spin_lock_irq(&p->sighand->siglock);
		if (!(p->flags & PF_EXITING) && list_empty(&p->cg_list))
		list_add(&p->cg_list, &task_css_set(p)->tasks);
		spin_unlock_irq(&p->sighand->siglock);

		task_unlock(p);
		} while_each_thread(g, p);
		read_unlock(&tasklist_lock);