Commit-ID: f1e3a0932f3a9554371792a7daaf1e0eb19f66d5
Gitweb: http://git.kernel.org/tip/f1e3a0932f3a9554371792a7daaf1e0eb19f66d5
Author: Kirill Tkhai <ktkhai@xxxxxxxxxxxxx>
AuthorDate: Mon, 22 Sep 2014 22:36:36 +0400
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Wed, 24 Sep 2014 14:47:11 +0200
sched: Use rq->rd in sched_setaffinity() under RCU read lock
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: <stable@xxxxxxxxxxxxxxx> # v3.14+
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>
---
kernel/sched/core.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 316127a..b5349fe 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4049,13 +4049,14 @@ long sched_setaffinity(pid_t pid, const struct cpumask *in_mask)
* 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_free_new_mask;
}
+ rcu_read_unlock();
}
#endif
again:
--
To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
|