Re: [PATCH v2] kexec: add sysctl to disable kexec

H. Peter Anvin
2013-12-10T00:35:46Z

On 12/09/2013 04:16 PM, Kees Cook wrote:
> For general-purpose (i.e. distro) kernel builds it makes sense to build with
> CONFIG_KEXEC to allow end users to choose what kind of things they want to do
> with kexec. However, in the face of trying to lock down a system with such
> a kernel, there needs to be a way to disable kexec (much like module loading
> can be disabled). Without this, it is too easy for the root user to modify
> kernel memory even when CONFIG_STRICT_DEVMEM and modules_disabled are set.
>
> Signed-off-by: Kees Cook <keescook@chromium.org>
> Acked-by: Rik van Riel <riel@redhat.com>

So the logic is to load a crashkernel and then lock down the machine
before services, networking etc. are enabled?

-hpa