This is a note to let you know that I've just added the patch titled
sched: Use rq->rd in sched_setaffinity() under RCU read lock
to the 3.17-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:
sched-use-rq-rd-in-sched_setaffinity-under-rcu-read-lock.patch
and it can be found in the queue-3.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f1e3a0932f3a9554371792a7daaf1e0eb19f66d5 Mon Sep 17 00:00:00 2001
From: Kirill Tkhai <ktkhai@xxxxxxxxxxxxx>
Date: Mon, 22 Sep 2014 22:36:36 +0400
Subject: sched: Use rq->rd in sched_setaffinity() under RCU read lock
From: Kirill Tkhai <ktkhai@xxxxxxxxxxxxx>
commit f1e3a0932f3a9554371792a7daaf1e0eb19f66d5 upstream.
Probability of use-after-free isn't zero in this place.
Signed-off-by: Kirill Tkhai <ktkhai@xxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/20140922183636.11015.83611.stgit@localhost
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/sched/core.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4008,13 +4008,14 @@ long sched_setaffinity(pid_t pid, const
* root_domain.
*/
#ifdef CONFIG_SMP
- if (task_has_dl_policy(p)) {
- const struct cpumask *span = task_rq(p)->rd->span;
-
- if (dl_bandwidth_enabled() && !cpumask_subset(span, new_mask)) {
+ if (task_has_dl_policy(p) && dl_bandwidth_enabled()) {
+ rcu_read_lock();
+ if (!cpumask_subset(task_rq(p)->rd->span, new_mask)) {
retval = -EBUSY;
+ rcu_read_unlock();
goto out_unlock;
}
+ rcu_read_unlock();
}
#endif
again:
Patches currently in stable-queue which might be from ktkhai@xxxxxxxxxxxxx are
queue-3.17/sched-use-dl_bw_of-under-rcu-read-lock.patch
queue-3.17/sched-use-rq-rd-in-sched_setaffinity-under-rcu-read-lock.patch
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