linux-kernel - Re: [PATCH v4 06/12] arm64: add sysfs vulnerability show for spectre v1

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Message-ID: <20190131175217.4ff452d5@donnerap.cambridge.arm.com>
Date:   Thu, 31 Jan 2019 17:52:17 +0000
From:   Andre Przywara <andre.przywara@....com>
To:     Jeremy Linton <jeremy.linton@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, stefan.wahren@...e.com,
        mlangsdo@...hat.com, suzuki.poulose@....com, marc.zyngier@....com,
        catalin.marinas@....com, julien.thierry@....com,
        will.deacon@....com, linux-kernel@...r.kernel.org,
        steven.price@....com, ykaukab@...e.de, dave.martin@....com,
        shankerd@...eaurora.org
Subject: Re: [PATCH v4 06/12] arm64: add sysfs vulnerability show for
 spectre v1

On Fri, 25 Jan 2019 12:07:05 -0600
Jeremy Linton <jeremy.linton@....com> wrote:

Hi,

> From: Mian Yousaf Kaukab <ykaukab@...e.de>
> 
> spectre v1, has been mitigated, and the mitigation is
> always active.
> 
> Signed-off-by: Mian Yousaf Kaukab <ykaukab@...e.de>
> Signed-off-by: Jeremy Linton <jeremy.linton@....com>
> ---
>  arch/arm64/kernel/cpu_errata.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c
> index de09a3537cd4..ef636acf5604 100644
> --- a/arch/arm64/kernel/cpu_errata.c
> +++ b/arch/arm64/kernel/cpu_errata.c
> @@ -730,3 +730,13 @@ const struct arm64_cpu_capabilities arm64_errata[] = {
>  	{
>  	}
>  };
> +
> +#ifdef CONFIG_GENERIC_CPU_VULNERABILITIES
> +
> +ssize_t cpu_show_spectre_v1(struct device *dev, struct device_attribute *attr,
> +		char *buf)

w/s issue. Other than that:

Reviewed-by: Andre Przywara <andre.przywara@....com>

Cheers,
Andre.

> +{
> +	return sprintf(buf, "Mitigation: __user pointer sanitization\n");
> +}
> +
> +#endif