On Tue, 3 Sep 2013, Matthew Garrett wrote:
> 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.
>
> Signed-off-by: Matthew Garrett <matthew.garrett@xxxxxxxxxx>
Reviewed-by: James Morris <jmorris@xxxxxxxxx>
> ---
> 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 46f1ea0..0c266b2 100644
> --- a/include/linux/module.h
> +++ b/include/linux/module.h
> @@ -509,6 +509,8 @@ 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. */
> @@ -619,6 +621,11 @@ 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 2069158..0e94acf 100644
> --- a/kernel/module.c
> +++ b/kernel/module.c
> @@ -3852,3 +3852,13 @@ 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);
> --
> 1.8.3.1
>
> --
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--
James Morris
<jmorris@xxxxxxxxx>
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