Re: [PATCH 3/7] security: introduce kernel_fw_from_file hook

Kees Cook
2014-07-22T20:55:23Z

On Tue, Jul 22, 2014 at 12:39 PM, Luis R. Rodriguez <mcgrof@suse.com> wrote:
> On Mon, Jul 14, 2014 at 3:31 PM, Kees Cook <keescook@chromium.org> wrote:
>> Yup, with this and the module hook, adding a similar hook for kexec
>> makes sense as well. A paranoid kernel doesn't want to trust anything
>> it's loading from userspace. :)
>
> Well I'm actually wondering if we could generalize requiring hooks or
> not for LSM as part of the general kobject definition. Then we
> wouldn't need to keep growing hooks for modules, firmware, kexec
> images, etc, but instead using the interfaces for kobjects and who
> depend on them. How that would actually look -- I'm not sure, but just
> a thought.

Yeah, there does seem to be a repeated "get a thing from userspace"
method here, but the interfaces have been rather scattered so far. I
haven't seen an obvious way to consolidate them yet.

-Kees

--
Kees Cook
Chrome OS Security