sched, modules: Fix nested sleep in add_unformed_module()

This is a genuine bug in add_unformed_module(), we cannot use blocking
primitives inside a wait loop.

So rewrite the wait_event_interruptible() usage to use the fresh
wait_woken() stuff.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: tglx@linutronix.de
Cc: ilya.dryomov@inktank.com
Cc: umgwanakikbuti@gmail.com
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: oleg@redhat.com
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: http://lkml.kernel.org/r/20140924082242.458562904@infradead.org
[ So this is probably complex to backport and the race wasn't reported AFAIK,
  so not marked for -stable. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/kernel/module.c b/kernel/module.c
index 88cec1d..e52a873 100644 (file)
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -3096,6 +3096,32 @@ static int may_init_module(void)
        return 0;
 }
 
+/*
+ * Can't use wait_event_interruptible() because our condition
+ * 'finished_loading()' contains a blocking primitive itself (mutex_lock).
+ */
+static int wait_finished_loading(struct module *mod)
+{
+       DEFINE_WAIT_FUNC(wait, woken_wake_function);
+       int ret = 0;
+
+       add_wait_queue(&module_wq, &wait);
+       for (;;) {
+               if (finished_loading(mod->name))
+                       break;
+
+               if (signal_pending(current)) {
+                       ret = -ERESTARTSYS;
+                       break;
+               }
+
+               wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
+       }
+       remove_wait_queue(&module_wq, &wait);
+
+       return ret;
+}
+
 /*
  * We try to place it in the list now to make sure it's unique before
  * we dedicate too many resources.  In particular, temporary percpu
@@ -3116,8 +3142,8 @@ again:
                    || old->state == MODULE_STATE_UNFORMED) {
                        /* Wait in case it fails to load. */
                        mutex_unlock(&module_mutex);
-                       err = wait_event_interruptible(module_wq,
-                                              finished_loading(mod->name));
+
+                       err = wait_finished_loading(mod);
                        if (err)
                                goto out_unlocked;
                        goto again;