linux-kernel - [PATCH 3/6] arm64: add sysfs vulnerability show for spectre v1

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Message-Id: <20181206234408.1287689-4-jeremy.linton@arm.com>
Date:   Thu,  6 Dec 2018 17:44:05 -0600
From:   Jeremy Linton <jeremy.linton@....com>
To:     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, mark.rutland@....com,
        linux-kernel@...r.kernel.org, ykaukab@...e.de,
        Jeremy Linton <jeremy.linton@....com>
Subject: [PATCH 3/6] arm64: add sysfs vulnerability show for spectre v1

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 6ad715d67df8..559ecdee6fd2 100644
--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -757,3 +757,13 @@ 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
-- 
2.17.2