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[PATCH v2 1/5] don't attach a task to a dead cgroup [message #46032 is a reply to message #46031]

Mon, 23 April 2012 19:37

Glauber Costa
Messages: 916
Registered: October 2011

Senior Member

Not all external callers of cgroup_attach_task() test to
see if the cgroup is still live - the internal callers at
cgroup.c does.

With this test in cgroup_attach_task, we can assure that
no tasks are ever moved to a cgroup that is past its
destruction point and was already marked as dead.

Signed-off-by: Glauber Costa <glommer@parallels.com>
CC: Tejun Heo <tj@kernel.org>
CC: Li Zefan <lizefan@huawei.com>
CC: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
---
kernel/cgroup.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index b61b938..932c318 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1927,6 +1927,9 @@ int cgroup_attach_task(struct cgroup *cgrp, struct task_struct *tsk)
struct cgroup_taskset tset = { };
struct css_set *newcg;

+ if (cgroup_is_removed(cgrp))
+ return -ENODEV;
+
/* @tsk either already exited or can't exit until the end */
if (tsk->flags & PF_EXITING)
return -ESRCH;
--
1.7.7.6

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[Message index]

		[PATCH v2 0/5] Fix problem with static_key decrement By: Glauber Costa on Mon, 23 April 2012 19:37
		[PATCH v2 1/5] don't attach a task to a dead cgroup By: Glauber Costa on Mon, 23 April 2012 19:37
		Re: [PATCH v2 1/5] don't attach a task to a dead cgroup By: KAMEZAWA Hiroyuki on Tue, 24 April 2012 02:20
		[PATCH v2 2/5] blkcg: protect blkcg->policy_list By: Glauber Costa on Mon, 23 April 2012 19:37
		[PATCH v2 3/5] change number_of_cpusets to an atomic By: Glauber Costa on Mon, 23 April 2012 19:37
		Re: [PATCH v2 3/5] change number_of_cpusets to an atomic By: KAMEZAWA Hiroyuki on Tue, 24 April 2012 02:25
		Re: [PATCH v2 3/5] change number_of_cpusets to an atomic By: Christoph Lameter on Tue, 24 April 2012 15:02
		Re: [PATCH v2 3/5] change number_of_cpusets to an atomic By: Glauber Costa on Tue, 24 April 2012 16:15
		Re: [PATCH v2 3/5] change number_of_cpusets to an atomic By: Christoph Lameter on Tue, 24 April 2012 16:24
		Re: [PATCH v2 3/5] change number_of_cpusets to an atomic By: Glauber Costa on Tue, 24 April 2012 16:30
		Re: [PATCH v2 3/5] change number_of_cpusets to an atomic By: Christoph Lameter on Tue, 24 April 2012 18:27
		[PATCH v2 4/5] don't take cgroup_mutex in destroy() By: Glauber Costa on Mon, 23 April 2012 19:37
		Re: [PATCH v2 4/5] don't take cgroup_mutex in destroy() By: KAMEZAWA Hiroyuki on Tue, 24 April 2012 02:31
		Re: [PATCH v2 4/5] don't take cgroup_mutex in destroy() By: Glauber Costa on Tue, 24 April 2012 11:42
		Re: [PATCH v2 4/5] don't take cgroup_mutex in destroy() By: Li Zefan on Wed, 25 April 2012 08:01
		[PATCH v2 5/5] decrement static keys on real destroy time By: Glauber Costa on Mon, 23 April 2012 19:37
		Re: [PATCH v2 5/5] decrement static keys on real destroy time By: KAMEZAWA Hiroyuki on Tue, 24 April 2012 02:40
		Re: [PATCH v2 5/5] decrement static keys on real destroy time By: Glauber Costa on Tue, 24 April 2012 11:41
		Re: [PATCH v2 5/5] decrement static keys on real destroy time By: KAMEZAWA Hiroyuki on Wed, 25 April 2012 00:22

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