Re: [PATCH 4/7] firmware_class: perform new LSM checks

James Morris
2014-07-20T23:46:15Z

On Sat, 19 Jul 2014, Kees Cook wrote:

[...]

> With the patch series, the LSM hook sees the userspace-touching loads:
> - from kernel built-in: no LSM hook (nonsense to check the static list)
> - direct from filesystem: called with file struct
> - via uevent /sys "loading"/"data" interface: called with NULL file struct
> - via uevent /sys "fd" interface: called with file struct

Thanks for the overview. Can we get this documented in the LSM code?

> The reason the "fd" interface was added was because otherwise there's
> no way for systems that use the uevent handler to communicate to the
> kernel where the bytes being shoved into the "data" interface are
> coming from.

Ok.

I gather folks have also thought about signing firmware?

--
James Morris
<jmorris@namei.org>