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33 lines
1.0 KiB
C
33 lines
1.0 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Handle detection, reporting and mitigation of Spectre v1, v2 and v4, as
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* detailed at:
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*
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* https://developer.arm.com/support/arm-security-updates/speculative-processor-vulnerability
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*
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* This code was originally written hastily under an awful lot of stress and so
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* aspects of it are somewhat hacky. Unfortunately, changing anything in here
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* instantly makes me feel ill. Thanks, Jann. Thann.
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*
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* Copyright (C) 2018 ARM Ltd, All Rights Reserved.
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* Copyright (C) 2020 Google LLC
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*
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* "If there's something strange in your neighbourhood, who you gonna call?"
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*
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* Authors: Will Deacon <will@kernel.org> and Marc Zyngier <maz@kernel.org>
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*/
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#include <linux/device.h>
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/*
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* Spectre v1.
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*
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* The kernel can't protect userspace for this one: it's each person for
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* themselves. Advertise what we're doing and be done with it.
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*/
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ssize_t cpu_show_spectre_v1(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "Mitigation: __user pointer sanitization\n");
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}
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