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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 d67b1932cc59..57474384b66b 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -551,6 +551,8 @@ 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. */
@@ -667,6 +669,10 @@ 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 3e0e19763d24..c3bce9c6a746 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -4082,3 +4082,13 @@ 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);
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