x86-64: seccomp: fix 32/64 syscall hole

[sfrench/cifs-2.6.git] / kernel / notifier.c

diff --git a/kernel/notifier.c b/kernel/notifier.c
index 4282c0a40a57ada651b86c7dcce2389abf489448..61d5aa5eced3466393582e4f566b63c468ea7cc3 100644 (file)
--- a/kernel/notifier.c
+++ b/kernel/notifier.c
@@ -82,6 +82,14 @@ static int __kprobes notifier_call_chain(struct notifier_block **nl,
 
        while (nb && nr_to_call) {
                next_nb = rcu_dereference(nb->next);
+
+#ifdef CONFIG_DEBUG_NOTIFIERS
+               if (unlikely(!func_ptr_is_kernel_text(nb->notifier_call))) {
+                       WARN(1, "Invalid notifier called!");
+                       nb = next_nb;
+                       continue;
+               }
+#endif
                ret = nb->notifier_call(nb, val, v);
 
                if (nr_calls)