[PATCH 4.19 093/114] arm64: Add sysfs vulnerability show for spectre-v1

[Greg Kroah-Hartman]

From: Mian Yousaf Kaukab <ykau...@suse.de>

[ Upstream commit 3891ebccace188af075ce143d8b072b65e90f695 ]

spectre-v1 has been mitigated and the mitigation is always active.
Report this to userspace via sysfs

Signed-off-by: Mian Yousaf Kaukab <ykau...@suse.de>
Signed-off-by: Jeremy Linton <jeremy.lin...@arm.com>
Reviewed-by: Andre Przywara <andre.przyw...@arm.com>
Reviewed-by: Catalin Marinas <catalin.mari...@arm.com>
Tested-by: Stefan Wahren <stefan.wah...@i2se.com>
Acked-by: Suzuki K Poulose <suzuki.poul...@arm.com>
Signed-off-by: Will Deacon <will.dea...@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheu...@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 arch/arm64/kernel/cpu_errata.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -729,3 +729,9 @@ const struct arm64_cpu_capabilities arm6
        {
        }
 };
+
+ssize_t cpu_show_spectre_v1(struct device *dev, struct device_attribute *attr,
+                           char *buf)
+{
+       return sprintf(buf, "Mitigation: __user pointer sanitization\n");
+}