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

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Message-ID: <2df6424a-cffc-95b8-1052-4a1acaeb4068@arm.com>
Date:   Thu, 28 Feb 2019 18:29:25 +0000
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     jeremy.linton@....com, linux-arm-kernel@...ts.infradead.org
Cc:     catalin.marinas@....com, will.deacon@....com, marc.zyngier@....com,
        dave.martin@....com, shankerd@...eaurora.org,
        julien.thierry@....com, mlangsdo@...hat.com, stefan.wahren@....com,
        andre.przywara@....com, linux-kernel@...r.kernel.org,
        ykaukab@...e.de
Subject: Re: [PATCH v5 02/10] arm64: add sysfs vulnerability show for spectre
 v1



On 27/02/2019 01:05, 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)
> +{
> +	return sprintf(buf, "Mitigation: __user pointer sanitization\n");
> +}
> 

minor nit: This could possibly have been in the cpufeature.c, where we keep
the spectre_v2 routine.

Either way,

Acked-by: Suzuki K Poulose <suzuki.poulose@....com>