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

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Message-ID: <80c4ee1b-6bab-237e-503d-556f344f7df9@linux.microsoft.com>
Date:   Fri, 28 Aug 2020 10:43:02 -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 6:23 PM, Thiago Jung Bauermann wrote:
> 
> Lakshmi Ramasubramanian <nramas@...ux.microsoft.com> writes:
> 
>> +/**
>> + * ima_get_kexec_buffer - get IMA buffer from the previous kernel
>> + * @addr:	On successful return, set to point to the buffer contents.
>> + * @size:	On successful return, set to the buffer size.
>> + *
>> + * Return: 0 on success, negative errno on error.
>> + */
>> +int ima_get_kexec_buffer(void **addr, size_t *size)
> 
> I just noticed that this function is only called from within
> ima_kexec.c, so it can be made static.

Will do.

> 
>> +{
>> +	int ret, len;
>> +	unsigned long tmp_addr;
>> +	size_t tmp_size;
>> +	const void *prop;
>> +
>> +	prop = of_get_property(of_chosen, FDT_PROP_IMA_KEXEC_BUFFER, &len);
>> +	if (!prop)
>> +		return -ENOENT;
>> +
>> +	ret = do_get_kexec_buffer(prop, len, &tmp_addr, &tmp_size);
>> +	if (ret)
>> +		return ret;
>> +
>> +	*addr = __va(tmp_addr);
>> +	*size = tmp_size;
>> +
>> +	return 0;
>> +}
>> +
>> +/**
>> + * ima_free_kexec_buffer - free memory used by the IMA buffer
>> + */
>> +int ima_free_kexec_buffer(void)
> 
> This one can be static as well.

Will do.

  -lakshmi

> 
>> +{
>> +	int ret;
>> +	unsigned long addr;
>> +	size_t size;
>> +	struct property *prop;
>> +
>> +	prop = of_find_property(of_chosen, FDT_PROP_IMA_KEXEC_BUFFER, NULL);
>> +	if (!prop)
>> +		return -ENOENT;
>> +
>> +	ret = do_get_kexec_buffer(prop->value, prop->length, &addr, &size);
>> +	if (ret)
>> +		return ret;
>> +
>> +	ret = of_remove_property(of_chosen, prop);
>> +	if (ret)
>> +		return ret;
>> +
>> +	return memblock_free(addr, size);
>> +
>> +}
>> +
>>   #ifdef CONFIG_IMA_KEXEC
>>   static int ima_dump_measurement_list(unsigned long *buffer_size, void **buffer,
>>   				     unsigned long segment_size)
> 
>