linux-kernel - Re: [PATCH v9 3/8] ima: Define get_ima_kexec

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Message-ID: <5c2a18f72af861be6494c2f325e83835be8e2f7e.camel@linux.ibm.com>
Date:   Tue, 01 Dec 2020 06:37:25 -0500
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>,
        bauerman@...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
Cc:     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 v9 3/8] ima: Define get_ima_kexec_buffer() in drivers/of

On Fri, 2020-11-13 at 11:22 -0800, Lakshmi Ramasubramanian wrote:
> The function do_get_kexec_buffer(), defined in arch/powerpc/kexec/ima.c,
> retrieves the address and size of the given property from the device
> tree blob. This function does not have architecture specific code, but is
> currently limited to powerpc. This function correctly handles a device
> tree property that is a child node of the root node, but not anything
> other than the immediate root child nodes.
> 
> Define an architecture independent function, namely
> get_ima_kexec_buffer(), in "drivers/of/ima_kexec.c". This function
> retrieves the chosen node, namely "linux,ima-kexec-buffer", from

Please remove the word "namely", here, and throughout the patch sets.

> the device tree, and returns the address and size of the buffer used
> for carrying forward the IMA measurement log across kexec system call.

get_ima_kexec_buffer() inlines the existing do_get_kexec_buffer() and 
get_addr_size_cells() functions, leaving a local copy of
get_addr_size_cells().   Duplicating code isn't a good idea.

thanks,

Mimi