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sched: Use rq->rd in sched_setaffinity() under RCU read lock
author
Kirill Tkhai
<ktkhai@parallels.com>
Mon, 22 Sep 2014 18:36:36 +0000
(22:36 +0400)
committer
Greg Kroah-Hartman
<gregkh@linuxfoundation.org>
Fri, 14 Nov 2014 17:00:11 +0000
(09:00 -0800)
commit
f1e3a0932f3a9554371792a7daaf1e0eb19f66d5
upstream.
Probability of use-after-free isn't zero in this place.
Signed-off-by: Kirill Tkhai <ktkhai@parallels.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link:
http://lkml.kernel.org/r/20140922183636.11015.83611.stgit@localhost
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
kernel/sched/core.c
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diff --git
a/kernel/sched/core.c
b/kernel/sched/core.c
index
e3b8502
..
9a3f3c4
100644
(file)
--- a/
kernel/sched/core.c
+++ b/
kernel/sched/core.c
@@
-3941,13
+3941,14
@@
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_unlock;
}
+ rcu_read_unlock();
}
#endif
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