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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Mian Yousaf Kaukab <ykaukab@suse.de>,
        Jeremy Linton <jeremy.linton@arm.com>,
        Andre Przywara <andre.przywara@arm.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Stefan Wahren <stefan.wahren@i2se.com>,
        Suzuki K Poulose <suzuki.poulose@arm.com>,
        Will Deacon <will.deacon@arm.com>,
        Ard Biesheuvel <ard.biesheuvel@linaro.org>
Subject: [PATCH 4.14 072/119] arm64: Add sysfs vulnerability show for spectre-v1
Date:   Sun, 27 Oct 2019 22:00:49 +0100
Message-Id: <20191027203338.579311139@linuxfoundation.org>
In-Reply-To: <20191027203259.948006506@linuxfoundation.org>
References: <20191027203259.948006506@linuxfoundation.org>
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From: Mian Yousaf Kaukab <ykaukab@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 <ykaukab@suse.de>
Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Acked-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@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
@@ -638,3 +638,9 @@ 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");
+}