Re: [PATCH v4 1/5] powerpc: Refactor kexec functions to move arch independent code to IMA

[Lakshmi Ramasubramanian]

On 8/27/20 4:35 PM, Thiago Jung Bauermann wrote:
> Lakshmi Ramasubramanian <nramas@xxxxxxxxxxxxxxxxxxx> writes:
>
> > The functions ima_get_kexec_buffer() and ima_free_kexec_buffer() that
> > handle carrying forward the IMA measurement logs on kexec for powerpc
> > do not have architecture specific code, but they are currently defined
> > for powerpc only.
> >
> > Move these functions to IMA subsystem so that it can be used for other
> > architectures as well. A later patch in this series will use these
> > functions for carrying forward the IMA measurement log for ARM64.
> >
> > Define FDT_PROP_IMA_KEXEC_BUFFER for the chosen node, namely
> > "linux,ima-kexec-buffer", that is added to the DTB to hold
> > the address and the size of the memory reserved to carry
> > the IMA measurement log.
> >
> > Co-developed-by: Prakhar Srivastava <prsriva@xxxxxxxxxxxxxxxxxxx>
> > Signed-off-by: Prakhar Srivastava <prsriva@xxxxxxxxxxxxxxxxxxx>
> > Signed-off-by: Lakshmi Ramasubramanian <nramas@xxxxxxxxxxxxxxxxxxx>
>
> This patch removes two functions from arch/powerpc/kexec/ima.c, but adds
> four to security/integrity/ima/ima_kexec.c. The extra ones are
> get_addr_size_cells() and do_get_kexec_buffer(), which are being copied
> from the powerpc code but can't be removed yet because they're still
> used there by remove_ima_buffer() and setup_ima_buffer().
>
> On the next patch you remove the need for these functions in powerpc
> code and therefore delete them. This confused me at first, so I think it
> would be cleared if you put patch 2 first in the series and then on this
> patch you can simply move the four functions and delete them from
> arch/powerpc/kexec/ima.c.
>
> If you prefer to keep the current order, it's worth mentioning on the
> commit log where get_addr_size_cells() and do_get_kexec_buffer() are
> coming from.
>
> Regardless:
>
> Reviewed-by: Thiago Jung Bauermann <bauerman@xxxxxxxxxxxxx>

Thanks for reviewing the changes Thiago.

I'll update the commit log to describe the changes related to 
get_addr_size_cells() and do_get_kexec_buffer().

 -lakshmi