Quoting Dmitry Kasatkin (dmitry.kasat...@intel.com):
> IMA measures/appraises modules when modprobe or insmod opens and read them.
> Unfortunately, there are no guarantees between what is read by userspace and
> what is passed to the kernel via load_module system call. This patch adds a
> hook called integrity_module_check() to verify the integrity of the module
> being loaded.
>
> Signed-off-by: Dmitry Kasatkin <dmitry.kasat...@intel.com>
> ---
> include/linux/integrity.h | 10 ++++++++++
> kernel/module.c | 9 +++++++++
> 2 files changed, 19 insertions(+)
>
> diff --git a/include/linux/integrity.h b/include/linux/integrity.h
> index 66c5fe9..a80ec06 100644
> --- a/include/linux/integrity.h
> +++ b/include/linux/integrity.h
> @@ -37,4 +37,14 @@ static inline void integrity_inode_free(struct inode
> *inode)
> return;
> }
> #endif /* CONFIG_INTEGRITY_H */
> +
> +#ifdef CONFIG_INTEGRITY_MODULES
> +int integrity_module_check(const void *hdr, const unsigned long len);
sadly not bisect-safe, since integrity_module_check() is defined in
the next patch.
> +#else
> +static inline int integrity_module_check(const void *buf, unsigned long len)
> +{
> + return 0;
> +}
> +#endif
> +
> #endif /* _LINUX_INTEGRITY_H */
> diff --git a/kernel/module.c b/kernel/module.c
> index 4edbd9c..791da47 100644
> --- a/kernel/module.c
> +++ b/kernel/module.c
> @@ -58,6 +58,7 @@
> #include <linux/jump_label.h>
> #include <linux/pfn.h>
> #include <linux/bsearch.h>
> +#include <linux/integrity.h>
>
> #define CREATE_TRACE_POINTS
> #include <trace/events/module.h>
> @@ -2437,6 +2438,14 @@ static int copy_and_check(struct load_info *info,
>
> info->hdr = hdr;
> info->len = len;
> +
> + err = integrity_module_check(hdr, len);
> + if (err < 0)
> + goto free_hdr;
> +
> + /* cut signature tail */
> + info->len = err;
> +
> return 0;
>
> free_hdr:
> --
> 1.7.9.5
>
> --
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