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From: Matthew Garrett <matthew.garrett@nebula.com>
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Date: Fri, 9 Aug 2013 17:58:15 -0400
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Subject: [PATCH] Add secure_modules() call
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Provide a single call to allow kernel code to determine whether the system
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has been configured to either disable module loading entirely or to load
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only modules signed with a trusted key.
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Bugzilla: N/A
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Upstream-status: Fedora mustard. Replaced by securelevels, but that was nak'd
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Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
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---
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include/linux/module.h | 7 +++++++
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kernel/module.c | 10 ++++++++++
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2 files changed, 17 insertions(+)
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diff --git a/include/linux/module.h b/include/linux/module.h
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index b03485bcb82a..b033dab5c8bf 100644
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--- a/include/linux/module.h
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+++ b/include/linux/module.h
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@@ -506,6 +506,8 @@ int unregister_module_notifier(struct notifier_block *nb);
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extern void print_modules(void);
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+extern bool secure_modules(void);
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+
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#else /* !CONFIG_MODULES... */
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/* Given an address, look for it in the exception tables. */
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@@ -616,6 +618,11 @@ static inline int unregister_module_notifier(struct notifier_block *nb)
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static inline void print_modules(void)
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{
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}
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+
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+static inline bool secure_modules(void)
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+{
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+ return false;
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+}
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#endif /* CONFIG_MODULES */
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#ifdef CONFIG_SYSFS
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diff --git a/kernel/module.c b/kernel/module.c
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index 538794ce3cc7..f3489ef9e409 100644
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--- a/kernel/module.c
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+++ b/kernel/module.c
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@@ -3911,3 +3911,13 @@ void module_layout(struct module *mod,
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}
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EXPORT_SYMBOL(module_layout);
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#endif
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+
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+bool secure_modules(void)
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+{
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+#ifdef CONFIG_MODULE_SIG
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+ return (sig_enforce || modules_disabled);
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+#else
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+ return modules_disabled;
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+#endif
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+}
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+EXPORT_SYMBOL(secure_modules);
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