linux-hardening - Re: [PATCH v5 07/17] soc: qcom: minidump: Add pending region registration

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Date:   Mon, 11 Sep 2023 13:08:48 +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 07/17] soc: qcom: minidump: Add pending region
 registration

On 09/09/2023 22:16, Mukesh Ojha wrote:
>  static int qcom_apss_minidump_probe(struct platform_device *pdev)
>  {
>  	struct minidump_global_toc *mdgtoc;
> @@ -571,7 +688,10 @@ static int qcom_apss_minidump_probe(struct platform_device *pdev)
>  		return ret;
>  	}
>  
> +	mutex_lock(&md_plist.plock);
>  	platform_set_drvdata(pdev, md);

Why this is locked?

> +	qcom_apss_register_pending_regions(md);

Why this one is locked? It seems ordering of your operations is not
correct if you need to lock the providers probe().

> +	mutex_unlock(&md_plist.plock);


Best regards,
Krzysztof