kernel/Add-secure_modules-call.patch

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 |  6 ++++++
 kernel/module.c        | 10 ++++++++++
 2 files changed, 16 insertions(+)

diff --git a/include/linux/module.h b/include/linux/module.h
index 7ffe0851d244..3da68fd1f657 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -515,6 +515,8 @@ static inline bool module_requested_async_probing(struct module *module)
 	return module && module->async_probe_requested;
 }
 
+extern bool secure_modules(void);
+
 #else /* !CONFIG_MODULES... */
 
 /* Given an address, look for it in the exception tables. */
@@ -631,6 +633,10 @@ static inline bool module_requested_async_probing(struct module *module)
 	return false;
 }
 
+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 f80a97f7da1f..5d3e6c6191fa 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -3925,3 +3925,13 @@ 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);