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Date: Fri, 28 Aug 2020 10:40:58 -0700 From: Lakshmi Ramasubramanian <nramas@...ux.microsoft.com> To: Thiago Jung Bauermann <bauerman@...ux.ibm.com> Cc: zohar@...ux.ibm.com, robh@...nel.org, gregkh@...uxfoundation.org, james.morse@....com, catalin.marinas@....com, sashal@...nel.org, will@...nel.org, mpe@...erman.id.au, benh@...nel.crashing.org, paulus@...ba.org, robh+dt@...nel.org, frowand.list@...il.com, vincenzo.frascino@....com, mark.rutland@....com, dmitry.kasatkin@...il.com, jmorris@...ei.org, serge@...lyn.com, pasha.tatashin@...een.com, allison@...utok.net, kstewart@...uxfoundation.org, takahiro.akashi@...aro.org, tglx@...utronix.de, masahiroy@...nel.org, bhsharma@...hat.com, mbrugger@...e.com, hsinyi@...omium.org, tao.li@...o.com, christophe.leroy@....fr, linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, prsriva@...ux.microsoft.com, balajib@...ux.microsoft.com Subject: Re: [PATCH v4 1/5] powerpc: Refactor kexec functions to move arch independent code to IMA On 8/27/20 4:35 PM, Thiago Jung Bauermann wrote: > > Lakshmi Ramasubramanian <nramas@...ux.microsoft.com> 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@...ux.microsoft.com> >> Signed-off-by: Prakhar Srivastava <prsriva@...ux.microsoft.com> >> Signed-off-by: Lakshmi Ramasubramanian <nramas@...ux.microsoft.com> > > 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@...ux.ibm.com> > 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
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