From: Thomas Gleixner commit 3160568371da441b7f2fb57f2f1225404207e8f2 upstream sched_getaffinity() is not protected against a concurrent modification of the tasks affinity. Serialize the access with task_rq_lock(task). Signed-off-by: Thomas Gleixner Acked-by: Peter Zijlstra LKML-Reference: <20091208202026.769251187@linutronix.de> Signed-off-by: Ingo Molnar Signed-off-by: Mike Galbraith Signed-off-by: Greg Kroah-Hartman --- kernel/sched.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/kernel/sched.c +++ b/kernel/sched.c @@ -6686,6 +6686,8 @@ SYSCALL_DEFINE3(sched_setaffinity, pid_t long sched_getaffinity(pid_t pid, struct cpumask *mask) { struct task_struct *p; + unsigned long flags; + struct rq *rq; int retval; get_online_cpus(); @@ -6700,7 +6702,9 @@ long sched_getaffinity(pid_t pid, struct if (retval) goto out_unlock; + rq = task_rq_lock(p, &flags); cpumask_and(mask, &p->cpus_allowed, cpu_online_mask); + task_rq_unlock(rq, &flags); out_unlock: read_unlock(&tasklist_lock); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/