linux-kernel - [PATCH v3 2/7] arm64: add sysfs vulnerability show for spectre v1

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Message-Id: <20190109235544.2992426-3-jeremy.linton@arm.com>
Date:   Wed,  9 Jan 2019 17:55:39 -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, linux-kernel@...r.kernel.org,
        ykaukab@...e.de, julien.thierry@....com, mlangsdo@...hat.com,
        steven.price@....com, stefan.wahren@...e.com,
        Jeremy Linton <jeremy.linton@....com>
Subject: [PATCH v3 2/7] 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 | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c
index 09ac548c9d44..8dde8c616b7e 100644
--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -109,6 +109,8 @@ cpu_enable_trap_ctr_access(const struct arm64_cpu_capabilities *__unused)
 
 atomic_t arm64_el2_vector_last_slot = ATOMIC_INIT(-1);
 
+uint arm64_requested_vuln_attrs = VULN_SPECTREV1;
+
 #ifdef CONFIG_HARDEN_BRANCH_PREDICTOR
 #include <asm/mmu_context.h>
 #include <asm/cacheflush.h>
@@ -742,3 +744,18 @@ const struct arm64_cpu_capabilities arm64_errata[] = {
 	{
 	}
 };
+
+#ifdef CONFIG_GENERIC_CPU_VULNERABILITIES
+
+uint arch_supported_vuln_attr_fields(void)
+{
+	return arm64_requested_vuln_attrs;
+}
+
+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