linux-kernel - Re: [PATCH v5 02/10] arm64: add sysfs vulnerability show for spectre v1

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Date:   Fri, 1 Mar 2019 00:54:51 -0600
From:   Andre Przywara <andre.przywara@....com>
To:     Jeremy Linton <jeremy.linton@....com>,
        linux-arm-kernel@...ts.infradead.org
Cc:     catalin.marinas@....com, will.deacon@....com, marc.zyngier@....com,
        suzuki.poulose@....com, Dave.Martin@....com,
        shankerd@...eaurora.org, julien.thierry@....com,
        mlangsdo@...hat.com, stefan.wahren@....com,
        linux-kernel@...r.kernel.org, Mian Yousaf Kaukab <ykaukab@...e.de>
Subject: Re: [PATCH v5 02/10] arm64: add sysfs vulnerability show for spectre
 v1

Hi,

On 2/26/19 7:05 PM, Jeremy Linton wrote:
> 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 | 6 ++++++
>   1 file changed, 6 insertions(+)
> 
> diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c
> index d2b2c69d31bb..ad58958becb6 100644
> --- a/arch/arm64/kernel/cpu_errata.c
> +++ b/arch/arm64/kernel/cpu_errata.c
> @@ -755,3 +755,9 @@ const struct arm64_cpu_capabilities arm64_errata[] = {
>   	{
>   	}
>   };
> +
> +ssize_t cpu_show_spectre_v1(struct device *dev, struct device_attribute *attr,
> +		char *buf)

w/s issue, but it's not critical:

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

Cheers,
Andre

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