This is a note to let you know that I've just added the patch titled
cpuset: fix a race condition in __cpuset_node_allowed_softwall()
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
cpuset-fix-a-race-condition-in-__cpuset_node_allowed_softwall.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 99afb0fd5f05aac467ffa85c36778fec4396209b Mon Sep 17 00:00:00 2001
From: Li Zefan <lizefan@xxxxxxxxxx>
Date: Thu, 27 Feb 2014 18:19:36 +0800
Subject: cpuset: fix a race condition in __cpuset_node_allowed_softwall()
From: Li Zefan <lizefan@xxxxxxxxxx>
commit 99afb0fd5f05aac467ffa85c36778fec4396209b upstream.
It's not safe to access task's cpuset after releasing task_lock().
Holding callback_mutex won't help.
Signed-off-by: Li Zefan <lizefan@xxxxxxxxxx>
Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/cpuset.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -2338,9 +2338,9 @@ int __cpuset_node_allowed_softwall(int n
task_lock(current);
cs = nearest_hardwall_ancestor(task_cs(current));
+ allowed = node_isset(node, cs->mems_allowed);
task_unlock(current);
- allowed = node_isset(node, cs->mems_allowed);
mutex_unlock(&callback_mutex);
return allowed;
}
Patches currently in stable-queue which might be from lizefan@xxxxxxxxxx are
queue-3.4/cpuset-fix-a-race-condition-in-__cpuset_node_allowed_softwall.patch
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