linux-hardening - Re: [PATCH v5 06/17] soc: qcom: Add Qualcomm APSS minidump kernel driver

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Date:   Mon, 11 Sep 2023 13:07:01 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Mukesh Ojha <quic_mojha@...cinc.com>, corbet@....net,
        agross@...nel.org, andersson@...nel.org, konrad.dybcio@...aro.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, keescook@...omium.org, tony.luck@...el.com,
        gpiccoli@...lia.com, mathieu.poirier@...aro.org,
        catalin.marinas@....com, will@...nel.org, linus.walleij@...aro.org,
        andy.shevchenko@...il.com, vigneshr@...com, nm@...com,
        matthias.bgg@...il.com, kgene@...nel.org, alim.akhtar@...sung.com,
        bmasney@...hat.com, quic_tsoni@...cinc.com
Cc:     linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-hardening@...r.kernel.org,
        linux-remoteproc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
        linux-mediatek@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, kernel@...cinc.com
Subject: Re: [PATCH v5 06/17] soc: qcom: Add Qualcomm APSS minidump kernel
 driver

On 09/09/2023 22:16, Mukesh Ojha wrote:
> +/**
> + * qcom_minidump_region_register() - Register region in APSS Minidump table.
> + * @region: minidump region.
> + *
> + * Return: On success, it returns 0 and negative error value on failure.
> + */
> +int qcom_minidump_region_register(const struct qcom_minidump_region *region)
> +{
> +	struct minidump *md;
> +	int ret;
> +
> +	md = qcom_smem_minidump_ready();
> +	if (!md)
> +		return -EPROBE_DEFER;
> +
> +	if (!qcom_minidump_valid_region(region))
> +		return -EINVAL;
> +
> +	mutex_lock(&md->md_lock);
> +	ret = qcom_md_region_register(md, region);
> +	if (ret)
> +		goto unlock;
> +
> +	qcom_md_update_elfheader(md, region);
> +unlock:
> +	mutex_unlock(&md->md_lock);
> +	return ret;
> +}
> +EXPORT_SYMBOL_GPL(qcom_minidump_region_register);

NAK, there is no user for this.

Drop all exports from minidump drivers. Your upstream driver *must not*
expose stuff to your vendor drivers.

Best regards,
Krzysztof