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(parent: 810cbee) | patch
cgroup: fail if monitored file and event_control are in different cgroup
authorLi Zefan <lizefan@huawei.com>
Mon, 18 Feb 2013 06:13:35 +0000 (14:13 +0800)
committerTejun Heo <tj@kernel.org>
Mon, 18 Feb 2013 17:31:35 +0000 (09:31 -0800)
commitf169007b2773f285e098cb84c74aac0154d65ff7
tree6b295320c25b9fe8c1e4e94fcc35570134ebb8betree | snapshot (tar.gz zip)
parent810cbee4fad570ff167132d4ecf247d99c48f71dcommit | diff
cgroup: fail if monitored file and event_control are in different cgroup

If we pass fd of memory.usage_in_bytes of cgroup A to cgroup.event_control
of cgroup B, then we won't get memory usage notification from A but B!

What's worse, if A and B are in different mount hierarchy, we'll end up
accessing NULL pointer!

Disallow this kind of invalid usage.

Signed-off-by: Li Zefan <lizefan@huawei.com>
Acked-by: Kirill A. Shutemov <kirill@shutemov.name>
Signed-off-by: Tejun Heo <tj@kernel.org>
kernel/cgroup.c diff | blob | blame | history
kernel source for telekom puls (alcatel/mediatek)