ANDROID: module loader: don't taint kernel when CONFIG_MODULE_SIG_PROTECT is enabled

When signed module protection is enabled, do not taint the kernel upon
loading an unsigned module.

Bug: 519119852
Change-Id: I10a776984efd420d2fbd9d75ccd9c85b1bf50e9d
Signed-off-by: Siddharth Nayyar <sidnayyar@google.com>

kernel/module/main.c

@@ -2636,12 +2636,14 @@ static void module_augment_kernel_taints(struct module *mod, struct load_info *i
 	}
 #ifdef CONFIG_MODULE_SIG
 	mod->sig_ok = info->sig_ok;
+#ifndef CONFIG_MODULE_SIG_PROTECT
 	if (!mod->sig_ok) {
 		pr_notice_once("%s: module verification failed: signature "
 			       "and/or required key missing - tainting "
 			       "kernel\n", mod->name);
 		add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK);
 	}
+#endif
 #endif
 
 	/*