kernel/Add-secure_modules-call.patch

From b0684b1fc4abcc4ca5a10c8ea3f4482fd7aa8df5 Mon Sep 17 00:00:00 2001
From: Matthew Garrett <matthew.garrett@nebula.com>
Date: Fri, 9 Aug 2013 17:58:15 -0400
Subject: [PATCH] Add secure_modules() call

Provide a single call to allow kernel code to determine whether the system
has been configured to either disable module loading entirely or to load
only modules signed with a trusted key.

Bugzilla: N/A
Upstream-status: Fedora mustard.  Replaced by securelevels, but that was nak'd

Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
---
 include/linux/module.h |  7 +++++++
 kernel/module.c        | 10 ++++++++++
 2 files changed, 17 insertions(+)

diff --git a/include/linux/module.h b/include/linux/module.h
index 71f282a4e307..341a73ecea2e 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -516,6 +516,8 @@ int unregister_module_notifier(struct notifier_block *nb);
 
 extern void print_modules(void);
 
+extern bool secure_modules(void);
+
 #else /* !CONFIG_MODULES... */
 
 /* Given an address, look for it in the exception tables. */
@@ -626,6 +628,11 @@ static inline int unregister_module_notifier(struct notifier_block *nb)
 static inline void print_modules(void)
 {
 }
+
+static inline bool secure_modules(void)
+{
+	return false;
+}
 #endif /* CONFIG_MODULES */
 
 #ifdef CONFIG_SYSFS
diff --git a/kernel/module.c b/kernel/module.c
index 03214bd288e9..1f7b4664300e 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -3842,3 +3842,13 @@ void module_layout(struct module *mod,
 }
 EXPORT_SYMBOL(module_layout);
 #endif
+
+bool secure_modules(void)
+{
+#ifdef CONFIG_MODULE_SIG
+	return (sig_enforce || modules_disabled);
+#else
+	return modules_disabled;
+#endif
+}
+EXPORT_SYMBOL(secure_modules);
-- 
1.9.3