[v4,06/12] arm64: add sysfs vulnerability show for spectre v1

Commit Message

Jeremy Linton Jan. 25, 2019, 6:07 p.m. UTC

From: Mian Yousaf Kaukab <[e-mail]>

spectre v1, has been mitigated, and the mitigation is
always active.

Signed-off-by: Mian Yousaf Kaukab <[e-mail]>
Signed-off-by: Jeremy Linton <[e-mail]>
---
 arch/arm64/kernel/cpu_errata.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

Comments

Andre Przywara Jan. 31, 2019, 5:52 p.m. UTC | #1

On Fri, 25 Jan 2019 12:07:05 -0600
Jeremy Linton <[e-mail]> wrote:

Hi,

> From: Mian Yousaf Kaukab <[e-mail]>
> 
> spectre v1, has been mitigated, and the mitigation is
> always active.
> 
> Signed-off-by: Mian Yousaf Kaukab <[e-mail]>
> Signed-off-by: Jeremy Linton <[e-mail]>
> ---
>  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 <[e-mail]>

Cheers,
Andre.

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

Patch

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